GENERAL PRECAUTIONS - cont - TM-5-3820-256-24-2

GENERAL PRECAUTIONS - cont - TM-5-3820-256-24-2_29

GENERAL PRECAUTIONS - cont - TM-5-3820-256-24-2_31

TM-5-3820-256-24-2 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12NSN3820-01-245-4276 Manual
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j. This includes: a thorough steam or caustic cleaning (or a solvent or water washing, depending on the combustible's solubility) followed by purging and inerting with nitrogen or carbon dioxide, and using protective equipment as recommended in A6.0. Waterfilling just below working level may substitute for inerting. k. A container with unknown contents should be cleaned (see paragraph above). Do NOT depend on sense of smell or sight to determine if it is safe to weld or cut. l. Hollow castings or containers must be vented before welding or cutting. They can explode. m. Explosive atmospheres. Never weld or cut where the air may contain flammable dust, gas, or liquid vapors (such as gasoline). 4-2.4 Compressed Gas Equipment. Standard precautions. Comply with precautions in this manual, and those detailed in CGA Standard P-1, PRECAUTIONS FOR SAFE HANDLING OF COMPRESSED GASES IN CYLINDERS, listed 6 in Standards index (para. 4-4). 4-2.4.1. Pressure Regulators a. Regulator relief valve is designed to protect only the regulator from overpressure; it is not intended to protect any downstream equipment. Provide such protection with one or more relief devices. b. Never connect a regulator to a cylinder containing gas other than that for which the regulator was designed. c. Remove faulty regulator from service immediately for repair (first close cylinder valve). The following symptoms indicate a faulty regulator: (1) Leaks - if gas leaks externally. (2) Excessive Creep - if delivery pressure continues to rise with downstream valve closed. (3) Faulty Gauge - if gauge pointer does not move off stop pin when pressurized, nor returns to stop pin after pressure release. d. Repair. Do NOT attempt repair. Send faulty regulators for repair to manufacturer's designated repair center, where special techniques and tools are used by trained personnel. 4-2.4.2 Cylinders. Cylinders must be handled carefully to prevent leaks and damage to their walls, valves, or safety devices. a. Avoid electrical circuit contact with cylinders including third rails, electrical wires, or welding circuits They can produce short circuit arcs that may lead to a serious accident. (See para. 4-3.3.) 4-4

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