PERMFILE65702

• Permit No: C1981044
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 16 MSHA ROOF AND VENTILATION PLANS
• Media Type: D
• Archive: No

Example Of Typical Explosion Pro! Seal
BIOCk type seals will ba hitched into
IM rib B floor o minimum of 12 incMS.
Vent papa(s) sholl be Instolled through the bulkhead into a
return aircource. It shall not bs more than 8 inches and have
o strength equal to schedule 40 stwl pipe and M located nsor
tM roof but not closer than 4 fwt from o riD and not on iM
cantor line of the bulkhead. Y~nt pipe atoll bs pocked with
gravel for al least 0 10 loot length or provided witA equivalent
flame arrestor. Tne endc of the~pipe shall M closed with psrforoted
cops. If there is no build up of posses inby the wale this pipe
may De closed rich a volve, of least one Oval in every set of Ovals.
Blacks shall M laid
in tr~sverfe pal tern.
B°sB ^ I6 Solid Blocks.
v
May be tooted with mortar
All joints shall M
Where neccessory, of leost
I-4~~ water drmnogs pipe shall
be at the lorest elevolion of IM
bulkhead. Pipe shall W made of corroewn
resistant material equal in strength t0 schedule
40 steel pips. Pipe should M copped or sealed
with u valve,and bs equipped with o U-tube to
lunation os a water trap.
Pilaster shall De included in
widths greater Ihan 16 feel and
heights greater than 10 feet.
At least one seal in
each wl of wale shall
Mvq survsilloncs (yw of
I/4 copper or 1/2
sMdule 40 Oipe or
equivolent and be placed
of occessoble outlet
rich c valve. Tuoe
fittings shall rithetond
at least 75 pu.
TM tube shall W
artlended of least
30 fwt inby Oval.