Before welding, cutting, or applying heat with an open flame to pipelines or containers that have contained flammable or combustible liquids, flammable gases, or explosive solids, the pipelines or containers shall be--
(a) Drained, ventilated, and thoroughly cleaned of any residue;
(b) Vented to prevent pressure build-up during the application of heat; and
(c)(1) Filled with an inert gas or water, where compatible; or
(1) Filled with an inert gas or water, where compatible; or
(2) Determined to be free of flammable gases by a flammable gas detection device prior to and at frequent intervals during the application of heat.
Sec. Appendix I to Subpart C of Part 56--National Consensus Standards
Mine operators seeking further information in the area of fire prevention and control may consult the following national consensus standards. ------------------------------------------------------------------------
MSHA standard National consensus standard------------------------------------------------------------------------Sec. Sec. 56.4200, 56.4201.... NFPA No. 10--Portable Fire
Extinguisher.
NFPA No. 11--Low Expansion Foam and
Combined Agent Systems.
NFPA No. 11A--High Expansion Foam
Systems.
NFPA No. 12--Carbon Dioxide
Extinguishing Systems.
NFPA No. 12A--Halon 1301
Extinguishing Systems.
NFPA No. 13--Water Sprinkler Systems.
NFPA No. 14--Standpipe and Hose
Systems.
NFPA No. 15--Water Spray Fixed
Systems.
NFPA No. 16--Foam Water Spray
Systems.
NFPA No. 17--Dry-Chemical
Extinguishing Systems.
NFPA No. 121--Mobile Surface Mining
Equipment.
NFPA No. 291--Testing and Marketing
Hydrants.
NFPA No. 1962--Care, Use, and
Maintenance of Fire Hose,
Connections, and Nozzles.Sec. 56.4202................... NFPA No. 14--Standpipe and Hose
Systems.
NFPA No. 291--Testing and Marketing
Hydrants.Sec. 56.4203................... NFPA No. 10--Portable Fire
Extinguishers.Sec. 56.4230................... NFPA No. 10--Portable Fire
Extinguishers.
NFPA No. 121--Mobile Surface Mining
Equipment.------------------------------------------------------------------------