fU " y £ <5> ' «> » v^-y v^v %.*•>*■ v * V -IV- e ^ .v"-, ^ v PU *«>«»' .^> • « • *^> V* •'&&: \-/ ••» %<* •*"•«* -,wff; **■-*. \wassr; £"•* V » T • »- ' J^\, '-111?* ^\ l MW : 4>*\ -% ^ i* W fr- "\ ^ ^ A* ' ^ y% '%wj /\ lllf ••* **^ ^W' /\ '-.hk-' ** v ^ ***** .*«» ^.^ .m^ %^ /«^ ^/ .*J0h a - v^ 1 w *bv B "oV 1 o . » - \/ --ate' %/ '^Ife \/ :2fcfc ^ -»a* V/ * W ♦ O. J* lT J ^v ** v \ 6 ^> «& a V V Ci_ * 'bK r ^Q? v^/^fe--. ^ .-issfei-. v^ .-ate-, v,** /jsofa. x.j* •■ k *. o ^^ .y ^ •• ♦+' ** I .» „y Bureau of Mines Information Circular/1987 Fire Doors for Noncoal Mines By Kenneth L. Bickel and William H. Pomroy UNITED STATES DEPARTMENT OF THE INTERIOR Information Circular 9165 •A Fire Doors for Noncoal Mines By Kenneth L. Bickel and William H. Pomroy UNITED STATES DEPARTMENT OF THE INTERIOR Donald Paul Hodel, Secretary BUREAU OF MINES David S. Brown, Acting Director y 0- Library of Congress Cataloging in Publication Data: Bickel, Kenneth L. Fire doors for noncoal mines. (Information circular/United States Department of the Interior, Bureau of Mines; 9165) Bibliography: p. 22 Supt. of Docs, no.: I 28.27: 9165. 1. Mine safety — Equipment and supplies. 2. Doors. I. Pomroy, William H. II. Title. III. Series: Information circular (United States. Bureau of Mines); 9165. TN295.U4 622'.8 87-600231 CONTENTS Page Abstract 1 Introduction 2 Analysis of mine doors^ currently in use 2 Door descriptions and operating characteristics 2 Assessment of the suitability of each door type for use as a mine fire door.. 3 Improved fire-door design and testing 5 First-generation fire door 5 Second-generation fire door 12 I Third-generation fire door 12 In-mine test 19 Summary and conclusions 21 References 22 Appendix. — Shop drawings of improved fire-door designs Pocket ILLUSTRATIONS 1. Fire-door air-pressure test fixture showing door assembly and fan 6 2. Fire-door air-pressure test fixture showing airbag 6 3. Fire-door fire-test frame with fire door installed 8 4. Fire-door fire-test fixture showing gas ports and thermocouples 9 5. Standard time-temperature curve for fire-door testing 10 6. Technician measuring door deflections during fire test 11 7. Door deflection caused by exposure to test fire 13 8. Second-generation fire door undergoing fire test 14 9. Second-generation fire door after removal from fire-test fixture 14 10. Third-generation fire-door fabrication showing thermal insulation blanket. 16 11. Third-generation fire-door mockup testing 17 12. Thermocouples arrayed on downfire side of fire door during fire testing... 18 13. Average surface temperatures of unexposed door panels during fire test of third-generation mine fire door 19 14. Fire exposure side of third-generation fire door after removal from the fire-test fixture 20 15. Artist's rendering of fire door installed in underground mine 21 TABLES 1. Advantages and disadvantages of each door type 4 2. Door deflection under conditions of pressure differential of 6-in w.g 7 UNIT OF MEASURE ABBREVIATIONS USED IN THIS REPORT °F degree Fahrenheit min minute ft foot pet percent f t/min foot per minute s second ft 3 /min cubic foot per minute st short ton h hour yr year in inch FIRE DOORS FOR NONCOAL MINES By Kenneth L. Bicker and William H. Pomroy 2 ABSTRACT During an underground mine fire, the importance of controlling the spread of smoke and toxic gases with suitable ventilation structures has been proven. However, under certain conditions, control of the propaga- tion of the fire itself may be even more critical in insuring a safe mine evacuation. Fire doors offer the means for accomplishing both ob- jectives. In 1978, the Bureau of Mines initiated research to evaluate the state of fire-door technology and develop and test a fire door suit- able for large openings (10 by 12 ft or larger) in noncoal underground mines. This report discusses current fire-door technology in the context of the underground mine environment and the design, fabrication, lab test- ing, and in-mine field testing of a mineworthy fire door. This door has a 1. 5-h fire resistance rating and limits temperature rise across the door to 250° F during the first 30 min of fire exposure. 'Mining engineer. ^Group supervisor. Twin Cities Research Center, Bureau of Mines, Minneapolis, MN. INTRODUCTION From 1965 to 1984, 177 noncoal under- ground mine fires were reported to Fed- eral mine safety authorities, and about 90 pet of the 121 fatalities resulting from these fires were caused by exposure to smoke and toxic gases (1_)« 3 The con- trol of smoke and gases during an under- ground mine fire is critically important. Under certain conditions, however, con- trolling the propagation of the fire it- self may be even more critical in insur- ing a safe mine evacuation. Fire doors are a practical means for limiting the spread of toxic combustion products and controlling fire propagation. Because of the value of fire doors, recent Federal mine safety regulations include require- ments for installing them in specified areas. Although these regulations permit alternatives to fire doors under certain circumstances (routing air directly to an exhaust system, mechanical ventilation reversal, effective evacuation, or in- stallation of an automatic fire- suppression system), fire doors are often preferred due to factors such as mine layouts, operating practices, and venti- lation plans. However, because no design guidelines or construction specifications for mineworthy fire doors for large underground openings were available, the fire-door option was not feasible for many mines. In 1978, the Bureau of Mines initiated a research and development contract to evaluate the state of fire-door technol- ogy and develop and test a fire door . suitable for large openings in noncoal underground mines. These research re- sults were intended to guide subsequent development efforts by door manufactur- ers, eventually resulting in commercial ; products. Some mines may also wish to ■ develop workable designs on their own. Shop drawings of each door are included in the appendix of this report. Initial phases of the research are de- scribed in detail in a progress report submitted to the Bureau by the contractor, Unidynamics, Inc. ^2)» Re- - suits of these initial phases are also summarized in a previous Bureau report (_3) and are briefly highlighted in this report. Because the contract was termi- nated prior to completion results of later phases of the contract, and subse- quent efforts by Bureau personnel to complete the program, have not been previously reported. ANALYSIS OF MINE DOORS CURRENTLY IN USE The study was initiated by determining the types of doors currently in use in underground mines. The five categories included — 1. roll doors. 2. swing doors with panels opening in the same direction. 3. swing doors with panels opening in opposite directions. 4. telescoping doors. 5. sliding doors. Most doors were operated either electri- cally or by compressed air. Of the five- door types encountered underground, only ^Underlined numbers in parentheses re- fer to items in the list of references at the end of this report. two (roll doors and sliding doors) were rated. Each door was held open by a fus- ible link that would melt during a fire, allowing gravity to close the door. Of the five door types studied, only three (roll doors, telescoping doors, and swing doors with panels opening in opposite directions) were observed in current mine use in the desired size range (10 by 12 ft or larger), however, all door types are discussed in detail below. DOOR DESCRIPTIONS AND OPERATING CHARACTERISTICS Roll doors, sometimes referred to as roll-down doors, consist of a series of horizontal metal slats, which are inter- locked to allow them to roll around a metal shaft when the door is opened ■: Li h (raised vertically), with little air leakage between the slats when the door is closed. The doors are electrically operated and controlled by pushbutton or lanyard. Swing doors with panels opening in the same direction are generally designed so that two air cylinders, one connected to each panel, are operated in tandem to open the door. Swing doors with panels opening in opposite directions are gen- erally designed so that the panels are connected by a linkage and operated by a single air cylinder. The doors are con- trolled by a lanyard located away from the door or by the use of photoelectric cells triggered by a passing vehicle. The telescoping door consists of a series of horizontal, channel-shaped sheet metal sections that stack on each other. As the lowest section is lifted by two cables wound on a drum, it nests into the next section directly above it and lifts it also. This process con- tinues until all sections have been lifted and the door is open. The door is electrically operated and controlled by pushbutton or lanyard. The sliding door consists of a door panel fitted with rollers on top. The rollers ride in a horizontal track above and parallel to the plane of the door opening. The door is generally opened and closed manually. The door can be made self-closing by slightly inclining the track. ASSESSMENT OF THE SUITABILITY OF EACH DOOR TYPE FOR USE AS A MINE FIRE DOOR Each door type was analyzed with re- spect to the requirement for a mine- worthy, 1.5-h rated fire door for large mine openings. The advantages and dis- advantages of each door type are given in table 1. Although some rated roll doors had been observed in mine use, general-purpose application of this door type throughout the noncoal mining industry was judged impractical due to its susceptibility to blast, mobile equipment, and ground move- ment damage. Such damage could render the door inoperable. Smoke leakage or fire propagation would be experienced if the door were stuck in the "up" position during a fire, and passage of escaping miners would be inhibited if the door were stuck in the "down" position. The primary deficiency of swing doors with panels opening in the same direction is the difficulty encountered in opening (or closing) the panels against a high ventilation pressure. Even in mines with relatively low pressure differen- tials, high pressures can be created by a fire. During a fire, airflows can be re- versed, greatly altering the opening and closing characteristics of a door from normal conditions. The disadvantages of swing doors with panels opening in opposite directions are minor. Although debris on the floor may hinder door operation, this is seldom a problem in the many mines that now use this type door for ventilation control. Likewise, although a floor trough is required to accommodate a bottom linkage for some designs, most do not, and since a concrete bulkhead and threshold are often installed in door openings anyway, the requirement for a floor trough would add little cost or complexity to an installation. Like the slats of a roll door, the sec- tions of a telescoping door are suscep- tible to damage from ground movement, blasting, and passing vehicles. Mis- alignment of the track or bent door sec- tions could render the door inoperable. As with the roll door, smoke leakage or fire propagation could be experienced if the door became stuck in the "up" posi- tion, and escaping miners could be pro- hibited from, passing if the door were stuck in the "down" position. The principal disadvantage of the slid- ing door is that an area alongside the door opening, large enough to accommodate the door panel, is required. In large openings (20 to 30 ft is not unusual), an area of this size would be quite costly to excavate. Also, the difficulty in achieving an effective seal around the door edges, which is characteristic of sliding doors, is much more pronounced as the area of the door increases. Based on the foregoing assessment and the information in table 1, the swing door with panels opening in opposite TABLE 1. - Advantages and disadvantages of each door type „ Door Typ e Advantages Disadvantages Roll doors.. Swing doors with panels opening in same direction. Swing doors with panels opening in opposite directions. Telescoping doors. Sliding doors. Raises and lowers vertically; not susceptible to damage from debris on roadway (however, debris may impair a bottom seal). Channels on either side of door. Complete door and operating mecha- nism mountable on bulkhead. Very rugged. Adjustable opening speed. and closing Air pressure differential across door opening has little effect on power required to open and close doors and makes sealing around edges simpler. Very rugged. Doors can be set at desired open- ing and closing speed. Raises and lowers vertically; not susceptible to damage from debris on roadway (however, debris on floor may prevent bottom seal). Channels on either side of door provide good air seal. The door panel or panels can be setup on an inclined track to provide self-closing. Air pressure has little effect on the opening or closing force required. Space required above door to house operating mechanism and door. Constructed of sheet metal; suscep- tible to damage from ground move- ment, equipment, and blasting. Slight misalignment of channels and/or slats may render door inoperable. Maintenance and lubrication re- quired so corrosion does not render door inoperable. In large openings or high differen- tial pressures, the door may de- flect excessively, rendering it inoperable. A high-pressure differential across the door could make opening and/or closing door difficult or impossi- ble and sealing around door perimeter difficult. Debris on the floor may prevent door from closing. Two air cylinders are generally re- quired to operate door. Where possible to mount an air cylinder on mine roof, one air cylinder can be used with a rod connected to top of each panel. Debris on floor may prevent door panels from closing properly. Some designs required a floor trough to accommodate a bar link- age at bottom of door. Susceptible to damage from equip- ment, blasting, and ground movement. Space required above door to store raised door sections and house op- erating mechanism. Contains many separate pieces, all of which must fall into place by gravity for door to operate. An area alongside each opening large enough to accommodate door is required. Difficult to achieve effective seal around door edges. : - k directions was determined to be best suited for use as an underground mine fire door. However, since no such door had ever been tested or rated for the de- sired 1.5-h fire resistance, appropriate door design criteria and construction specifications were unknown. It was therefore determined that a design for such a door should be developed and that the design should be verified by subject- ing a prototype door to a 1.5-h fire resistance test. IMPROVED FIRE-DOOR DESIGN AND TESTING Design criteria for the improved fire door were established as — 1. Type: The swing door with panels opening in opposite directions was se- lected because the design allows air pressure to be balanced on the panels, and because it can be ruggedly built. 2. Size: The maximum size door that will fit into the fire-door test fixture at Underwriter's Laboratories (UL) is 12 by 10 ft. (Larger door sizes may be approved by UL based on fire testing of doors up to 12 by 10 ft followed by addi- tional analysis. ) 3. Long-life: The door was designed to last for over 200,000 cycles, or for at least 5 yr. 4. Fire rating: A fire-door rating of 1.5 h was specified. 5. Means of operation: Compressed air. 6. Design pressure differential: 6- in-w.g. pressure differential across the door with higher pressure ratings possible. FIRST-GENERATION FIRE DOOR The first-generation fire door con- sisted of 11-gauge sheet steel welded to a steel frame, with steel strip horizon- tally welded to the face of the door for reinforcement. Neoprene door seals were used for sealing around the perimeter of the door. The door assembly included a 2-ft 6-in by 6-ft 8-in airlock, one- person man door. Mockup testing was conducted in the laboratory, using a specially constructed test fixture. The test fixture consisted of a 12- by 16-ft plywood box (with the door assembly comprising one side), a fan for blowing air inside the box, and an airbag attached to the outside of the door side of the box for determining leakage through the door assembly. Fig- ures 1 and 2 show, respectively, the fire-door air-pressure test fixture with door assembly, man door, and fan in- stalled; air-pressure test-fixture with airbag installed. A manometer was used to measure air pressure differential across the door. With the fan blowing, a sliding regulator panel in the plywood box was adjusted until the desired 6-in-w.g. steady-state pressure differential across the door was achieved. Air leakage through the door assembly was determined by measuring air velocity through a 2.5- by 6.7-ft opening in the airbag. Five measurements were made, yielding an average velocity of 270 ft/ min. Total leakage through the fire door-man door assembly was thus 4,523 ft 3 /min, well within the design goal of 8,000 ft 3 /min at 6-in-w.g. pres- sure differential. After leakage tests, the airbag was removed and door deflection measurements taken. With the doors closed, three lengths of mechanic's wire were stretched horizontally across the downstream side of the door assembly; one at the top of the doors, one at the center, and one at the bottom. The distance from the wire to the door was measured at three points along each wire (hinge line, center, and edge) for each door panel (right and left). After these initial conditions were recorded, the fan was started and the regulator panel adjusted to achieve the desired 6-in-w.g. pressure differen- tial across the door assembly. At this pressure differential, the distances be- tween the wires and door panels were remeasured and the door deflections cal- culated. The door deflection test results are summarized in table 2. Under HVf^- ,J| 1 1 M FIGURE 1. — Fire-door air-pressure test fixture showing door assembly and fan. FIGURE 2.— Fire-door air-pressure test fixture showing airbag. TABLE 2. -Door deflection under conditions of pressure differential of 6-in w.g. , first-generation door Location of Door deflection, in measurement Initial 1 Fan on Deflection Top: Hinge. . Center. Edge. . . Center: Hinge. . Center. Edge. . . Bottom: Hinge. . Center. Edge. . . Top: Hinge. . Center. Edge. . . Center: Hinge. . Center. Edge. . . Bottom: Hinge. « Center. Edge. . . LEFT PANEL 1 6-1/8 4-1/8 1-1/2 6-3/8 4-5/16 1-1/2 6-3/16 4-3/8 5-11/16 3-5/16 1-1/2 5-1/2 2-13/16 1-1/2 5-5/16 2-11/16 7/16 13/16 7/8 1-1/2 7/8 1-1/2 RIGHT PANEL 1-1/2 5-15/16 3-1/2 1-1/2 2-5/16 3-1/2 1-1/2 6-1/8 3-7/8 1-1/2 5-1/2 2-11/16 1-7/16 1-5/8 2-1/16 2-1/2 5-5/16 2-1/8 7/16 13/16 1/16 11/16 1-7/16 13/16 1-3/4 these test conditions, equivalent to a load of 1.87 st distributed over the door's surface, the maximum deflection measured was 1-3/4 in. It was also dem- onstrated that one person, by pushing on one door panel, could easily open the door despite the 6-in-w.g. pressure dif- ferential. A cycling test was performed to identify weaknesses in the mechanical design of the hinge assembly and opening-closing mechanism. After opening and closing the door every 15 s for ap- proximately 1 h, no change in door oper- ating characteristics was observed. After successful mockup testing, the door was sent to UL for a 1.5-h fire rat- ing test. The door (without ajoining man door) was built into a 16-in masonry wall contained within a test frame (fig. 3) and sealed using the neoprene seals. FIGURE 3. — Fire-door fire-test frame with fire door installed. After the masonry wall had seasoned, the fire test was conducted in accordance with UL standard 10B (4_). The test frame was attached to a text fixture containing gas ports (to provide fuel for the fire) and thermocouples (to measure tempera- tures on the fire side of the door) (fig. 4). Temperatures within the fur- nace were in accordance with the standard time-temperature curve for fire-door testing (fig- 5). Throughout the fire test, observations were made to note the character of the fire and its control, the condition of the exposed and unex- posed faces, and all developments perti- nent to the doors as a fire barrier, with special reference to stability and flame passage (fig. 6). I i # # I * I I * FIGURE 4.— Fire-door fire-test fixture showing gas ports and thermocouples. 10 50 60 70 80 TIME, min FIGURE 5. — Standard time-temperature curve for fire-door testing 90 100 110 120 The fire was luminous and well distrib- uted during the fire test. Deflection of the doors was determined by measurements at about the center point of a horizontal wireline stretched across the midheight of the doors. During the first few min- utes of fire exposure, the doors began to bow away from the fire. The deflection at the center of the doors reached a max- imum of 3-1/4 in at 60 min. At 4 min, the faces of both doors began to buckle slightly. Flaming occurred along the neoprene seal at the meeting edge of the doors after 11 min, 20 s. The seal fell off the door after 30 s and continued to flame violently on the floor until extin- guished. After 15 min of fire exposure, the doors had deflected 1-1/2 in at the top, along the meeting edge, and in a direction perpendicular to the face of the doors. The doors continued to de- flect and reached a maximum of 3 in after 60 min of fire exposure. After 25 min, 50 s, flaming occurred along the seal at the top of the doors. After 26 min, flaming occurred at the top of the hinge tube on the North door. After 28 min, flaming also occurred along the entire hinge edge, and between the door and the fire-door frame at a point 52 in up from the bottom of the door. At 44 min, flam- ing occurred along the bottom of the doors on the neoprene seal. The fire test was halted after 60 min. 11 FIGURE 6.-Technician measuring door deflections during fire test. 12 At the conclusion of the fire test, it was determined that the door failed the 1.5-h fire rating test because of the following: 1. A 3-in deflection occurred along the upper meeting edge of the two panels. This deflection exceeded the of the doors and allowed the of flame through the door thickness passage (fig. 7). 2. An door and opening occurred between the frame along the hinge edges because the neoprene seal burned away. SECOND-GENERATION FIRE DOOR The second-generation fire-door design was similar to the first door, however, changes were made to structurally rein- force the door panels and to improve the door seal using material with a higher fire-resistance rating. The second door consisted of 14-gauge sheet steel over a steel frame, with 5-in-wide steel channel welded to the skin both horizontally and diagonally for reinforcement. It was de- termined that the thinner 14-gauge steel would tend less toward warping the door's frame. A material specifically designed for fire doors was used for sealing around the edges of the panels. After successful mockup testing, using the same test fixture and procedures used for the original door, the second door was sent to UL for fire testing (fig. 8). The fire test procedures were identical to those employed during fire tests of the original door. The door was built into a 16-in-thick masonry wall contained within the steel test frame. After the wall had seasoned, the test was conducted in accordance with UL Standard 10B "Fire Tests of Door Assemblies". The fire was luminous and well distributed during the entire test. The furnace temperature was controlled in accordance with the stan- dard time-temperature curve for fire-door testing (fig. 5). At no time during the test did any of the door-panel seals show any signs of combustion or deterioration. The door panels did bow and buckle slightly, and a deflection along the meeting edge of the door panels was observed; however, at no time did the deflection exceed the thickness of the door, nor was flame passage through the door observed. As a result, this door successfully passed the UL Standard 10B 1.5-h fire rating test (fig. 9). THIRD-GENERATION FIRE DOOR After testing the second-generaticn fire door, the following mandatory regu- lations were promulgated by the Mine Safety and Health Administration (MSHA) for metal and nonmetal underground mines (5): 30 CFR 57.4-61A: To prevent the spread of smoke or gas in the event of a fire, venti- lation doors shall be installed at or near shaft stations of intake shafts and at any shaft designated as an escapeway under standard 57.11-53 or at other locations which provide equivalent protec- tion. Doors constructed by this standard shall be constructed ac- cording to the specifications with- in the definition of "fire door" in section 57.2, if located in a tim- bered area, in an area where the exposed rock is combustible, or in an area where a significant fire hazard is present. 30 CFR 57.4-61B: To confine or prevent the spread of toxic gases from a fire origi- nating in an underground shop, the mine operator shall install in each opening to the shop a fire door or bulkhead constructed in accordance with the definition of "fire door" contained in section 57.2. The definition of fire door con- tained in section 57.2 stated: fire door means an openable closure for a passageway, shaft, or other mine opening to serve as barrier to fire, the effects of fire, and air leakage. A fire door shall be con- structed of materials and assembled so as to be equivalent to a door having a fire-resistance rating of i 13 FIGURE 7.— Door deflection caused by exposure to test fire. 14 FIGURE 8.— Second-generation fire door undergoing fire test. FIGURE 9. — Second-generation fire door after removal from the fire-test fixture. 15 1.5 h or greater, and on exposure to fire on one one side for 30 min, the temperature on the unexposed side shall not exceed 250° F, as determined by a nationally recog- nized testing agency in accordance with "Standard Method of Fire Tests of Door Assemblies," National Fire Protection Association (NFPA) Code 252, 1972, or equivalent. The framework assembly of a fire door and the surrounding bulkhead, if any, shall be at least equivalent to the fire door in fire and air- leakage resistance, and in physical strength. NFPA Code 252 is hereby incorporated by reference and made a part thereof. This definition of MSHA's performance requirements for a fire door differed from the requirements contained in the preproposal draft of the standard in that the surface temperature-rise requirement was added. Thus, the second-generation fire door failed to satisfy MSHA's per- formance requirements as promulgated, be- cause no provision had been made to limit the temperature rise on the surface of the " downf ire side of the door. In view of this deficiency, a third-generation fire door was designed to meet all requirements of the new definition. A more recent regulation, 57.4760/61, effective April 15, 1985 (6_), permits 1.5-h fire doors that do not satisfy the 250° F surface temperature requirements for areas of a mine that are more than 20 ft but less than 50 ft from timbered areas, combustible ore, or other combust- ible materials. This regulation further states that doors greater than 50 ft from such combustibles need meet only the requirements for a ventilation door. The third-generation fire-door con- sisted of two 14-gauge sheet steel skins welded -to either side of a steel frame, reinforced with 5-in-wide steel channel. The interior volume of the door (between the sheet steel skins) was filled with a 5-in-thick, asbestos-free mineral fiber insulation blanket (fig. 10). The door was subjected to the same deflection, cycling, and leakage tests as the first- and second-generation doors (fig. 11), with similar results. The door was then sent to UL for fire testing. The door was also subjected to the same 1.5-h fire test as were the previous doors, however, surface temperatures were measured on the downfire side of the door in accordance with applicable provisions of "Standard for Fire Tests of Door Assemblies," UL Standard 10B. The fire was luminous and well distrib- uted during the fire test. After 3 min of fire exposure, the door faces began to buckle towards the fire between the sup- porting channels. The deflections of each panel were mea- sured using wires stretched across the opening. During the first few minutes of fire exposure, the doors began to bow to- ward the fire. The center deflection of the right and left panels reached a maxi- mum 3-1/4 in and 3-5/8 in, respectively, at 75 min. At 8 min, the top of the right panel at the meeting edge began to bow away from the fire. After 10 min of fire exposure, the door had deflected a maximum of 1-1/2 in at the top and along the meeting edge in a direction perpendicular to the face of the doors. After 19 min of exposure, the gasketing at the meeting edge of the doors began to smoke. At 33 min, the bottom sill channel began to bow in to- wards the fire. A maximum deflection of 1-1/2 in toward the fire was observed at 70 min. At 47 min, intermittent light flaming was observed at the top of the meeting edge of the doors. This flaming did not exceed a 6-in length or 1-min FIGURE 10. — Third-generation fire-door fabrication showing thermal insulation blanket. duration. After 60 min, the smoke from the gasketing material was subsiding. At 62 min, flaming was observed at the upper hinge location of the north door; how- ever, the flaming was contained within the door and did not extend past the plane of the door face to the unexposed surface. This flaming continued until 68 min- During the 90-min fire-test duration no flaming was observed on the unexposed surface of the door assembly, nor through openings developed in the door assembly, and the latch remained engaged. Ten thermocouples were arrayed over the downfire side of the door (fig. 12) to measure surface temperatures on the un- exposed side of the door. $91 17 FIGURE 11. — Third-generation fire-door mockup testing. 18 FIGURE 12.— Thermocouples arrayed on downfire side of fire door during fire testing. The unexposed surface temperature was 82° F prior to the test, and after 30 min of fire exposure, the average unexposed surface temperature rose to 158° F. The unexposed door-panel surface temperature over the entire 90-min test is shown in figure 13. The appearance of the exposed face of the test assembly after the fire test is shown in figure 14 (note the sagging overhead linkage). Based on observations of the door dur- ing the fire test and a thorough examina- tion of the door following the fire test, UL issued a report stating the door, "demonstrated suitable protection for openings in walls requiring 1. 5-h, 250° F maximum rise Fire Rated Door Assemblies. " 19 IN-MINE TEST Another third-generation door was in- stalled at the Ozark Lead Company's Millikan mine near Sweetwater, MO, for long-term endurance testing (fig. 15). The 16 by 11 ft door was installed in a 20 by 14 ft main haulage drift near a shaft station. It functioned properly for approximately 6 months before being struck by a passing load-haul-dump vehi- cle. The door frame was damaged, causing excessive air leakage to occur. The door was repaired by mine personnel, except for the bottom seal on one panel. Ap- proximatly 15 months after the door was installed, it was evaluated for leakage and overall performance. At the time, pressure differential across the door was 1,800 1 i i i i i i i i i I 1.600 - 1,400 yS^ ^ — ' ^Furnace temperature - 1 - < 1,000 - 1 - TEMPEf CD o o - 1 - 600 - 1 - 400 200 ■^Surface temperature of unexposed door panel - i T i i i i i i i i i i 10 20 30 40 50 60 70 80 90 100 110 120 TIME, min FIGURE 13.— Average surface temperatures of unexposed door panels during fire test of third-generation mine fire door. 20 FIGURE 14. — Fire exposure side of third-generation fire door after removal from the fire-test fixture. less than 0. 2-in w.g. Actual leakage could not be measured, as proper instru- ments for low velocity airflow measure- ment were not available at the minesite. However, a close visual inspection of the door revealed no apparent leakage points (with the exception of the missing bottom seal). The door was opened and closed numerous times to check for signs of un- due wear or impaired operation. No deg-* I radation in door operation occurred during the endurance test period. :: 21 FIGURE 15.— Artist's rendering of fire door installed in underground mine. SUMMARY AND CONCLUSIONS During an underground mine fire, con- trolling the spread of toxic gas and smoke is essential. If a fire were to occur in an area such as a shaft station or shop, however, controlling the spread of the fire itself may be even more important. The Bureau analyzed the state-of-the- art of fire-door technology to determine the suitability of existing designs for underground mine use. As existing de- signs were found deficient, a new door, suitable for use in underground mines, was designed, fabricated, and subjected 22 to a 1.5-h fire rating test. This door failed the fire rating test due to exces- sive deflection of the door panels and the burning of neoprene edge seals. Therefore, a second-generation door was designed with greater structural integri- ty and fitted with seals having a higher fire resistance. This door successfully passed the UL Standard 10B fire test for 1.5-h rated fire doors. A third-generation fire door was de- signed in response to an MSHA regulation, which required that fire doors be con- structed and assembled so as to be equiv- alent to a door having a fire resistance rating of 1.5 h or greater, and, on expo- sure to fire on one side, the temperature on the unexposed side shall not exceed 250° F. The third-generation door was similar in construction to the second- generation door except a 5-in-thick blan- ket of thermal insulation was incor- porated into each door panel to limit temperature rise on the downfire side. When fire tested, this door satisfied both the fire-resistance and temperature- rise test criteria. Another third- generation door was fabricated and in- stalled in an operating underground mine for endurance testing. No design flaws or operating deficiencies were apparant after 15 months of mine use. The three doors developed during this research program represent progressively increasing levels of fire protection for underground mines. The first-generation door, though not suitable as a fire door, is an excellent ventilation door, provid- ing protection from the spread of smoke and toxic fire gases. Such doors are permitted under current MSHA regulations in areas greater than 50 ft from mine combustibles. The second-generation door also acts as a ventilation barrier and offers 1.5-h fire resistance as well. This door meets MSHA requirements for a fire door that is located more than 20 ft but less than 50 ft from timbered areas, combustible rock, or other combustible material. Finally, the third-generation door fulfills all requirements mandated by MSHA for fire doors, including 1.5-h fire resistance and limiting surface tem- peratures to 250° F for 30 min on the unexposed side. Where ventilation or fire doors are required, use of these, or equivalent doors, is recommended. Shop drawings of each door are included in the appendix to this report. REFERENCES 1. Butani, S. J. Private communica- tion, 1986; available upon request from S. J. Butani, BuMines, Minneapolis, MN. 2. Schoenlein, K. Evaluation of the Construction of Fire Doors, Air Doors, and Bulkheads For Noncoal Mines. Phase II Rep. BuMines Contract H0282003 with Unidynamics, Inc. 1978. Available for inspection at BuMines, Minneapolis, MN. 3. Staff, Bureau of Mines. Under- ground Metal and Nonmetal Mine Fire Pro- tection. Proceedings: Bureau of Mines Technology Transfer Seminars, Denver, Colo., Nov. 3, 1981, and St. Louis, MO., Nov. 6, 1981. BuMines IC 8865, 1981, 150 pp. 4. Underwriters Laboratories. Stan- dard for Fire Tests of Door Assemblies, UL-10B 5th ed. , Chicago, IL, 1974. 5. U.S. Code of Federal Regulations. Title 30 — Mineral Resources; Chapter I — Mine Safety And Health Administration Department of Labor; Subchapter N — Metal and Nonmetal Mine Safety and Health; Part 57 — Safety and Health Standards, Metal & Nonmetal Underground Mines; July 1, 1984. 6. . April 15, 1985. INT.-BU.OF MINES,PGH.,PA. 28602 k% - XS » W .'ffi& %<** .' ** v % • 4*V ♦t^.g* %,''?•> >\o . V^^\^ ^•--•\< v ^'^rf^o* \.'-v!- 4 ^ *•. \S i. .u *-i, ° • » - 4 ■» o 3l^ * ^^ ?£Mz5*\ ^«i> •«SSia" i ' '-*U^ **.♦♦ .-ate- xj**** r oV" v-o^ i>^ r oV J" o. V^-*\^ ^^ " • - ^ > \^^\/.. %^v \*^ f \/ V 1 ^'^ vv ^^ P^ * . . o ^y ^P* . > . • • • - *>* «v . . „ «*• ^ •TvV .r ... * A A* . « « . ^ ^^ * AV -5-* * -«. v ^ .^€"^y« a'* ^ . -*SJ|yr* ^* • _ cy ^^ ,5 ^ ^ t *'^<* Ta . c V •^ %. * . ilV ' A '"*J ^ * J IV K '^ ? . t .** ,*° . .280-.293 DIA./V 22 24 HOLES /7Y_^24 I DRILL (.228 DIA) 24 HOLES VIEW-E | D 5/2 | SCALE l/ 2 " S ECTION A-A | A6/2 SCALE I/4" ? Jr-V 3rd Generation Fire Door UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES SHEET J OF 3 All S GOVEINHEKT PRINTING OFFICE 1JH-J18 % SECTION F-F A8/2n Third Generation Fire Door ,,, DAT. „«...»»«.!» UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES SCALE """" EO s „ iET 2 o f 3 ftUSMHimilNT PH1HIW OFFICE 15)1-111 tM NOTES 1 VEHICLE DOOR OPENING 12' WIDE x 10' HIGH 2 AIR REQUIREMENTS: 2 CFM at 90 PSIG A. POWER REQUIREMENTS! 120 VOLT, SINGLE PHASE, 60 CYCLE AND"! AMP 3 DESIGNED FOR DIFFERENTIAL PRESSURE 6" WATER WITHOUT EXCEEDING 35% MATERIAL YIELD STRENGTH. TO BE DESIGNED TO PASS UL TYPE-FIRE TEST 250° TEMP. RISE DESIGN LIFE WITHOUT MAJOR OVERHAUL 204,000 CYCLES OR 5 YEARS USE PART TO BE MOUNTED AS A HOLE PATTERN TO BE ADJUSTED SO CYLINDER BOTTOMS WHEN DOORS ARE OPEN 90° ADJUST FOR PROPER SPACING BY CLOSING BOTH DOORS (ITEMS I a 2) UNTIL EACH DOOR IS PARALLEL TO ITEM 7. MATERIAL R/M 604 NM-NEOPRENE COATED CLOTH MAY BE PURCHASED FROM RM ENGINEERED PRODUCTS, INC. RO. BOX 5205 N. CHARLESTON S.C. 29406 TRIM END AS REQUIRED FOR CLEARANCE PRESS TIP OF SEAL AGAINST MATING SURFACE UNTIL SEAL BEGINS TO BUCKLE AND FASTEN TO THIS POSITION REMOVE BURRS AND BREAK SHARP EDGES VISUALLY INSPECT WELDS /s\ FILL INTERIOR VOLUME OF DOOR PANELS WITH 5" THICK THERMAL INSULATION BLANKET. MATERIAL AVAILABLE FROM THE CARBORUNDUM CO., INSULATION DIVISION PO BOX 808 NIAGARA FALLS, NEW YORK 14302 (SPECIFY FIBERFAX DURABLANKET 4lb/ft 3 ) QTY. ITEM| PART NO. 1 DESCRIPTION | MATL/SPEC | MANUFACTURER PARTS LIST AR 50 12821951-21 5" OD x 3'/ 2 ID x l/ 8 TH A\ 1 10 49 '/ 4 20UNC-2AX l/ 2 SCREW, SELF TAPPING-TYPE F HEX HD |STL ZINC PLD COML. 2 48 GP 34 ,375x 1.750-10 GROOVE PIN GROOVE PIN CORP. 2 47 12821582-2 HANDLE 1 46 12821951-18 '/ 8 X7 x M7 '/a A 4 45 12821951 - II '/ 8 x5'/ 2 x 121 /lo\ 4 44 1 12821501 - 15 FLAT 26 43 '/4-20 UNC-2AXI SCREW, SELF TAPPING-TYPE F STL. ZINC PLD COML 14 42 '/4 NOM WASHER, BEVELED STL. ZINC PLD COML 2 41 FFI505-5 FLANGE BEARING (I'AID x i/ 2L G) OILITE 1 40 12821582-3 COVER 2 39 '/I6DIA x I/4 LG COTTER PIN STEEL COML 2 38 II47AII 160 FUSIBLE LINK (2516) U.L. APVD MCMASTER CARR 1 37 12821582- 1 LATCH 1 36 12821501 - 14 FLAT 4 35 HC-1050 SINGLE BOLT RING CLAMP DAYCO 10 34 9LI LOW PRESSURE HOSE DAYCO 4 33 S5-4-MHC -45 MALE HOSE CONNECTOR CAJON 2 32 S-4-SE STREET ELBOW STEEL 2 31 S-4-ME MALE ELBOW STEEL i 2 30 S-8-RB-4 REDUCER BUSHING STEEL CAJON 24 29 V 4 -20UNL-20 x l 3 / 4 BOLT, HEX HD STL. ZINC PLD COML 1 28 12821951-11 ANGLE 2'/ 2 x2V 2 x 3 / l6 x 5 M 1020 STEEL 2 27 F400B FLOW CONTROL VALVE MANATROL 1 26 826 B-IIIC-612 4-WAY AIR VALVE MAC 8 25 5 /8 NOM LOCK WASHER, HELICAL STL. ZINC PLD COML 3 24 HG-567 PIN S.P. MFG. CO. 5 23 BG-538 ROD CLEVIS S.P. MFG.CO. 66 22 l/ 4 -20UNC-2B NUT, HEX, SELFLOCKING STL. ZINC PLD COML 1 21 12821300-16 TIE ROD CONNECTOR 4 20 '/2 NOM BEVELED WASHER STEEL COML 2 19 12821501-2 LOWER DOOR SEAL 2 18 12821 501-1 UPPER DOOR SEAL 2 17 1282150. -16 ANGLE 8 16 5 /r-I 1 UNC-2B NUT, HEX, SELFLOCKING STL. ZINC PLD COML 16 15 5 /b-I1 UNC-2A-2LG BOLT, HEX, HD 8 14 V ? -I3UNC-2B NUT, HEX, SELFLOCKING 8 13 l / 2 -l5UNC-2Ax|3/ 4 BOLT, HEX HD _ 31 12 V 4 -20UNC-2A x 3 / 4 SCREW, SELF TAPPING-TYPE F 2 II I-8UNC-2B NUT, HEX JAM STL. ZINC PLD COML 1 10 12821300-5 SUPPORT ROD AIR CYLINDER 16 9 '/4-20UNC-2Ax|'/2 BOLT, HEX HD STL ZINC PLD COML 4 8 SCM-2" BORE FLANGE BEARING-4 BOLT DODGE 1 7 12821951-3 LOWER SUPPORTING FRAME 2 6 5 12821951-10 12821300-2 UPPER SUPPORTING FRAME 1 4 12821300-1 DOOR TIE ROD AIR CYLINDER end-port position n„.2 S.P. MFG. CO. 1 I 2 1 I282I0I3-I 12821013-2 DOOR ASSEMBLY DOOR ASSEMBLY MINE FIRE DOOR it, OATE OESCR.PT.ONOEF-EV.S.ON DRAWN UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES SCALE _CHECKEO__ SHEET 3 "3 aUSStMSKBEin PRIHTIME OFFICE ISTF-HI-IH notes: i vehicle door opening 12' wide x |0' high. 2 man door opening 2-6" wide»6'-b" high. 3 AIR REQUIREMENTS! 2 C.F.M. at 90 PSIG. 3A POWER REQUIREMENTS: 120 VOLT, SINGLE PHASE. 60 CYCLE 4- 1 AMP. 4 DESIGNED FOR DIFFERENTIAL PRESSURE OF 6" WATER. WITHOUT EXCEEDING 35% MATERIAL YIELD STRENGTH. 5 TO BE DESIGNED TO PASS U.L.TYPE S l'/ 8 HOUR FIRE RATING TEST. 6 DESIGN LIFE WITHOUT MAJOR OVERHAUL 201,000 CYCLES OR 5 YEARS. 7 AIR LEAKAGE NOT TO EXCEED 8000 C.F.M. AT 6" WATER . DIFFERENTIAL PRESSURE. AuSE PART TO BE MOUNTED AS A TEMPLATE FOR THE HOLE PATTERN. £^T0 BE ADJUSTED SO CYLINDER BOTTOMS WHEN DOORS ARE OPEN 90° NEOPRENE COATED FABRIC AVAILABLE FROM R.M. ENGINEERED PRODUCTS INC. PO BOX 5205, NORTH CHARLESTON S.C., 29406 SPECIFY - . RM 604 NM TRIM END AS REQUIRED FOR CLEARANCE. PRESS TIP OF SEAL AGAINST MATING SURFACE UNTIL SEAL BEGINS TO BUCKLE AND FASTEN IN THIS POSITION. LOCATED AT CUSTOMERS OPTION DOOR OPEN/DOOR CLOSED SWITCHES LOCATED AT CUSTOMERS OPTION S REF '|6)#l DRILL (.228 DIA) 3 HOLES 43 REF/-N3 BULKHEAD PANELS WILL BE FIT TO CUSTOMERS NEEDS \ 8"* MINE DRAINAGE LINE OTY. ITEM| PART NO. 1 DESCRIPTION MATL/SPEC | MANUFACTURER PARTS LIST 24 83 1/4-20 UNC-2AXI3/4 BOLT HEX HD STEELZINCPL COML. 1 82 12821201-16 AN6LEl/4X|x|l/ 4 ASTM A36 STEEL 26 81 1/4-20 UNC-2AXM/4 BOLT HEX HD STEELZINCPL COML 2 80 CI7 CONDUIT BOX GRAYBAR 2 79 1/2-14 NPT NIPPLE, CONDUIT, CLOSE GRAYBAR 14 78 1/4 -NOM. WASHER, BEVELED STEELZINCPL COML. 1 77 1/2-14 NPT ELBOW, 90° FEMALE STEELZINCPL COML. 1 76 I/2-I4NPTX2LG NIPPLE STEEL COML. AR 75 12821201-15 5"0DX3"IDX 1.8" TH A 4 74 12821201-14 HINGE SEAL A RM ENGINEERED PROD 2 73 1/32 DIA 20" SEIZEING WIRE COML. 2 72 l /4" DIAX|"LG SPRING PIN PLT'D..STL COML. 2 71 l/4"DIAXI0'LG NYLON ROPE COML. 12 70 1/2" NOM FLAT WASHER ZINCPLT'DSTl COML. 3 69 12821700-1 CEILING ADAPTER 1 68 LI00WDL-2M W 9 LIMIT SWITCH R.B. DENISON 2 67 12821201-13 ANGLE 2x2x3/|6xl8 M-1020 STEEL 14 66 '/4-20UNC-2AX 1 'BOLT, FLAT HD-SLOTTED-82 ZINCPLT'DSTl COML. 4 65 I/4-20UNC-2AX3/4 BOLT, HEX HD ZINC PLT'DSTL COML. 4 64 2270 90" ANGLE CONNECTOR T*B 3 63 2523 STRAIGHT CONNECTOR T*B 30' 62 DSGA-3 CA-8 CABLE STRIP LENGTH I2'V6" COML. 30' 61 DSGA-3 CA-7 CABLE STRIP LENGTH I2"*6" COML. 15' 60 DSGA-3 CA-6 CABLE STRIP LENGTH I2"*6" COML. 16' 59 DSGA-3 CA-5 CABLE STRIP LENGTH 12"* 6" COML. 6' 58 FSGA-3 CA-4 CABLE STRIP LENGTH I2>6" COML. 22' 57 FSGA-3 CA-3 CABLE STR 1 P LENGTH 1 Z% 6" COML. 14' 1 56 55 DSGA-3 CA-2 12821205-1 CABLE STRIP LENGTH 12"*- 6" MINE DOOR CONTROLLER COML. 2 54 KA LEVER R.B. DENISON 2 53 FC LEVER R.B. DENISON 1 52 LIOOWDR-2MN0.5 LIMIT SWITCH R.B. DENISON 2 51 LI00WS-2M No.! LIMIT SWITCH R.B. DENISON 4 50 HC-1050 SINGLE BOLT RING CLAMP DAYCO 10' 49 4LI LOW PRESSURE HOSE DAYCO 4 48 SS-4-MHC-4S MALE HOSE CONNECTOR CAJON 2 47 S-4-SE STREET ELBO STEEL CAJON 2 46 S-4-ME MALEELBO STEEL CAJON 2 45 S-8-RB-4 REDUCER BUSHING STEEL CAJON 44 /4-20UNC-2AXM/2 BOLT, HEX HD ZINCPLT'DSTL COML. 3 43 12821201-12 ANGLE 2'/2x2'/2x3/|6X5 M-1020 STEEL 2 42 F400 B FLOW CONTROL VALVE MANATROL 1 41 826 B-HIC-612 4-WAY AIR VALVE MAC 1 40 349 WEATHER PROOF BACK BOX EDWARDS SIGNALING | 39 874-120 VOLT ADAPTAHORN EDWAROS SIGNALING 4 38 5/8 NOM LOCKWASHER HELICAL ZINCPLT'DSTL COML. 4 37 /2 NOM LOCKWASHER HELICAL ZINCPLT'DSTL COML. 3 36 HG-567 PIN S.P. MFG. 3 35 BG-538 ROD CLEVIS COLOR ADHESIVE SEALENT, TRANSLUCENT S.P. MFG. AR 34 NO 532 SILASTIL DOW CORNING 182 33 /4-20UNC-2B NUT, HEX SELFLOCKING ZINC PLT'D STL COML. ? 32 P-10354 186" GASKET "E" PATTERN VINYL J.B. IND, 2 31 12827500-4 PASSAGE DOOR, LOWER AIR SEAL A RM ENGINEERED PRO 20 1 30 29 /2l3UNC-2AX|l/ 2 12821300-16 BOLT, HEX HD TIEROD CONNECTOR ZINC PLT'D STL COML. 1? 28 1/2" NOM BEVELED WASHER STEEL COML. 1 27 HINGE SEAL A RM ENGINEERED 7 ?6 7 HT 2.5X15' 7"C" SECTION INRYCO 2 2 25 24 23 I282;50-I LOWER DOOR SEAL A RM ENGINEERED PROD 1282150-16 8 ?? 5/e-ll UNC -28 NUT, HEX SELF LOCKING ZINC PLT'D STL COML. 1 21 1282120-16 SHEET II Ga.(J20)x20x36 3 / e LOW CARBON STEEL 16 ?n 5/ 8 -ll UNC-2AX2"LG BOLT HEX HO ZINCPLT'DSTL COML. 26 19 I/2-I3UNC-2B NUT, HEX SELF LOCKING ZINCPLT'DSTL COML. 2 18 1282150-2 UPPER DOOR SEAL A m ENGINEERED PROD. 14 17 I/2-I3UNC2AXI3/4 BOLT, HEX HD ZINC PLT'D STL COML. 38 I/4-20UNC2AX3/4 SCREW, TYPE-F, SELF TAPPING HEX HD ZINCPLT'DSTL COML. 2 1 15 14 4-8UNC-28 12821300-5 MUT, HEX, JAM, ZINC PL. SUPPORT ROD-AIR CYLINDER STEEL COML. 38 13 l/ 4 -20UNC-2AX 1 12821600-1 BOLT, HEX HO AIR LOCK HALLWAY ZINCPLT'DSTL COML. 4 1 1 II 9 8 7 6 SCM-2"B0RE 12821300-4 1282 1400-1 1282 1300-14 12821500-2 FLAN6E BEARING, 4 BOLT LOWER SUPPORTIN FRAME LEFT SIDE SUPPORT FRAME RT.SIDE SUPPORT FRAME DODGE 1 UPPER SUPPORT FRAME 1 5 12821300-1 A3G5"-I5"-CC DOOR TIE -ROD ... * v . 1K , ncD 2 HOD DIA. WITH 1.5-12 AIR CYLINDER male ROD END SP MFG 2 I 3 12821250-1 128210 PASSAGE DOOR DOOR ASSEMBLY 1 | 1 1282100 DOOR ASSEMBLY 2nd Generation Fire Door DRAWN UNITED S DEPARTMENT OF BUREAU O TATES SCALE ("HE interior F MINES CHECKED SHEET 1 OF 4 ISO- NOTES: 1 REMOVE BURRS, BREAK ALL SHARP EDGES 2 VISUALLY INSPECT WELDS REMOVE ALL FOREIGN MATTER. MILL SCALE, RUST, WELD SPLATTER ETC., AND APPLY TWO COATS OF TT-P-645, ZINC CHROMATE PRIMER CLEAN SURFACES TO BE PAINTED, THEN APPLY ONE (I) COAT MIL-E-ISI300C ENAMEL PAINT, HAZE GRAY, N0.5H OMIT PAINT FROM THESE SURFACES TRIM FLANGE OF ITEM 7 TO FIT OVER ITEM 6, IF REQUIRED REVISION STATUS OF SH SHI SH2 SH SH INCORPORATED EDCO P£[E APPROVED 23 22 21 20 19 ie 17 16 15 14 13 12 II 10 9 8 7 6 S 4 3 2 I ITEM I282IO0I- 27 12821001-26 12821001-25 12821001-24 12821001-23 12821001-22 12821001-21 12821001-20 I282IOOI -19 12821001-18 12821001-17 12821001 -16 12821001-15 1 2821001 -14 12821001 -13 12821001-12 12821001 -II 12821001- 2 12821050-2 12821001 -10 12821000-12 12821000-11 12821000-10 PART NO. CHANNEL 5X6.7 #/FT 693/4" ANGLE l/4"»2-l/2"x2'^/2'l(7r^l/2" FLAT3/8'x4l(4"xl2 FLAT3/ 8 "x 4"x7" ANGLE IWs|lA"«l/4Xll4" ANGLE |l/ 2 x| 1/2 xifcx 31 K, ANGLE |l/ 2 "x |l/ 2 x l/a" K 16 CHANNEL 5'X6','7#/FTX||53/4" CHANNEL 5'X6','7#/FTX723/| 6 " ANGLE l/ 4 x2l/ 2 "x2l/2"x7l/2" CHANNEL 5'x 61' 7#/FTX|5/ 8 " CHANNEL 5'X6;'7#/*FTX 5" CHANNEL 5'x 6',' 7#/FT« 6" FLAT l /4'x|9/l6 , X45/8" CHANNEL 5'XG;'7#/FTX 653/n" CHANNEL 5X6','7#/FTX723/|6" CHANNEL S^^ltf/ FTX693/4" ACTUATOR ARM ACTUATOR ARM 579/16" SHEET I4GAx733 / 4,"x||5'/4" BAR BAR TUBE DESCRIPTION PARTS LIST A36 STEEL A36 STEEL Ml 020 STEEL MI020 STEEL A36 STEEL A36 STEEL A3 6 STEEL A36 STEEL A3 6 STEEL A36 STEEL A36 STEEL A36 STEEL A36 STEEL MI020 STEEL A36 STEEL A36 STEEL A36 STEEL LOW CARBON STEEL MATL/SPEC MFG TYP-3 SIDES\ 2 -PL ' UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES U S GOVCRKMEHT PRtNIIKC OFFICE 19T7-JT8 47 [33) .280-. 293 DIA. J 6 4 64 HOLES ! 65 ) SECTION C-C fpeTT) scale i/-" _J*EF TWO BOLTS PER PANEL, BOTH ENDS _ .280-.293 DIA. 3 HOLES REF .280-. 293 DIA. 13 HOLES R EP 2 PLACES SECTION H-H |E47T1 REF SCALE l/ 4 " I* REF 280-.293 DIA. 82" COUNTERSINK TO .507-. 520 DIA 14 HOLES ON 12" CENTERS #1 DRILL!. 228 DIA) 3 HOLES SECTION D-D~rD~57T1 SCALE I/4" 44) .280-. 293 DIA. 8\ 14 HOLES SECTION A-A [TiTT] SCALE l/ 4 " SECTION B-B [b 6/1 1 SCALE I/4" SECTION G-G lB~77n SCALE It" .280-. 293 DIA., 24 HOLES REF DETAIL F-F |g4/T] SCALE l/ 4 " DETAIL E-E [g77T| SCALE I/4" .280-293 DIA 3 HOLES DETAIL L [C77T| SCALE V4" TYP6-N SCALE 3 /. SECTION K-K |B7/| I SCALE 3 /e SCALE 3 / B " TYPICAL 6 PLACES 2nd Generation Fire Door UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES ^U S GQVERNHEHI MINTING CFFICt 1917-170 4! SECTION E-E [esTTI SCALE I/4 SECTION D-D [Em] SCALE I/4" SECTION A- A |c7/i SCALE I/4" H~~ REF ~*| -653/"- ^ 13/4- -|3/ 4 " REF vU l3 ° ]r J © 12821001-13 [E47T SCALE W *i r -723/16- V' ic 3 /4 REF REF I6)5"CHANNEL SECTION B-B [piTT] SCALE l/ 4 " f-1 3 /; w. (7) 12821001-12 |bs/i |b4/i| SCALE I/4" ! 1 -SLOT POSITION TYP. BOTH DOORS ~w^r 4 <« VIEW F-F |cs7T1 SCALE l/ 4 " SECTION C-C |D4/l| SCALE I/4" Q i3 za ® 12821001-23 [eITT SCALE V4" K-|3/ 4 REF 7'/ 8 " 31 »l.9 t-*H II -1153/4- :?□ -1^ fis) 12821001-20 |cs/i I p/5 | SCALE l/a" -V © Dm? i3°^y I 3/4 12821001-19 |B6/i|A5/i| SCALE I/4" -1 3/4 l 9 /|6 r . 5 REF 12821001-16 [1777 SCALE l/ 2 -43/-"- 3 / B ^l \% -35/ 8 - '/4_ REF /^\ 12821001-14 |F6/l I F5/I I SCALE 1/4" I l5 / lf l3 /|6- T ■2'/; 2" U- 8I/4 12" -71 1/,' (14) 12821001-18 I E 7/1 I SHOWN (22) 12821001-26 I E4/ 1 I OPPOSITE ^^^ SCALE I/4" 1 3/4 T„ 4 1/4 1 -3/4 U-3 A (J) 12821001-25 |C6/2|B6/2| SCALE I/4" 2nd Generation Fire Door J UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES SMvBSKtMIMIIIIB OFFIti. I917-7JMH