{"operation":"document","citation":"ERG 2024 Guide 173","title":"Guide 173: Adsorbed Gases - Toxic*","source_type":"guidance","agency":"U.S. DOT / Transport Canada / SICT","status":"guidance","official":true,"published_on":"2024-04-04","effective_on":null,"summary":"ERG2024 response Guide 173: Adsorbed Gases - Toxic*.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-erg-2024-guide-173.json","markdown":"https://regulus.evalyn.ai/document/phmsa-erg-2024-guide-173.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-erg-2024-guide-173","source_url":"https://www.phmsa.dot.gov/erg/guide?number=173","body":"GUIDE\n173\nAdsorbed Gases - Toxic*\nPOTENTIAL HAZARDS\nHEALTH\n•\nTOXIC; may be fatal if inhaled or absorbed through skin.\n•\nVapors may be irritating.\n•\nContact with gas may cause burns and injury.\n•\nFire will produce irritating, corrosive and/or toxic gases.\n•\nRunoff from fire control or dilution water may cause environmental contamination.\n•\n•\n•\n•\n•\n•\n•\nFIRE OR EXPLOSION\nSome gases may burn or be ignited by heat, sparks or flames.\nMay form explosive mixtures with air.\nOxidizers may ignite combustibles (wood, paper, oil, clothing, etc.) but NOT readily due to low\ntransportation pressures.\nVapors may travel to source of ignition and flash back.\nSome of these materials may react violently with water.\nCylinders exposed to fire may vent and release toxic and flammable gas through pressure relief devices.\nRunoff may create fire hazard.\nPUBLIC SAFETY\nCALL 911. Then call emergency response telephone number on shipping paper. If shipping paper\nnot available or no answer, refer to appropriate telephone number listed on the inside back cover.\nKeep unauthorized personnel away.\nStay upwind, uphill and/or upstream.\nMany gases are heavier than air and will spread along the ground and collect in low or confined areas\n(sewers, basements, tanks, etc.).\nVentilate closed spaces before entering, but only if properly trained and equipped.\n•\n•\n•\n•\n•\nPROTECTIVE CLOTHING\n•\nWear positive pressure self-contained breathing apparatus (SCBA).\n•\nWear chemical protective clothing that is specifically recommended by the manufacturer when there is\nNO RISK OF FIRE.\n•\nStructural firefighters' protective clothing provides thermal protection but only limited chemical protection.\nEVACUATION\nImmediate precautionary measure\n•\nIsolate spill or leak area for at least 100 meters (330 feet) in all directions.\nSpill\n•\nSee Table 1 - Initial Isolation and Protective Action Distances.\nFire\n•\nIf several small packages (inside a railcar or trailer) are involved in a fire, ISOLATE for 1600 meters\n(1 mile) in all directions; also, consider initial evacuation for 1600 meters (1 mile) in all directions.\n* \u0007 Some substances may also be flammable, corrosive\nand/or oxidizing\nPage 276\nERG 2024\n\nAdsorbed Gases - Toxic* GUIDE\n173\nEMERGENCY RESPONSE\nFIRE\n•\nDO NOT EXTINGUISH A LEAKING GAS FIRE UNLESS LEAK CAN BE STOPPED.\nSmall Fire\n•\nDry chemical, CO2, water spray or alcohol-resistant foam.\n•\nFor UN3515, UN3518, UN3520, use water only; no dry chemical, CO2 or Halon®.\nLarge Fire\n•\nWater spray, fog or alcohol-resistant foam.\n•\nDo not get water inside containers.\n•\nIf it can be done safely, move undamaged containers away from the area around the fire.\n•\nDamaged cylinders should be handled only by specialists.\nFire Involving Several Small Packages (inside a railcar or trailer)\n•\nFight fire from maximum distance or use unmanned master stream devices or monitor nozzles.\n•\nCool containers with flooding quantities of water until well after fire is out.\n•\nDo not direct water at source of leak or safety devices.\n•\nWithdraw immediately in case of rising sound from venting safety devices or discoloration of tank.\n•\nALWAYS stay away from tanks in direct contact with flames.\nSPILL OR LEAK\n•\nSome gases may be flammable. ELIMINATE all ignition sources (no smoking, flares, sparks or flames)\nfrom immediate area.\n•\nFor flammable gases, all equipment used when handling the product must be grounded.\n•\nFor oxidizing substances, keep combustibles (wood, paper, oil, etc.) away from spilled material.\n•\nDo not touch or walk through spilled material.\n•\nStop leak if you can do it without risk.\n•\nDo not direct water at spill or source of leak.\n•\nUse water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled\nmaterial.\n•\nPrevent entry into waterways, sewers, basements or confined areas.\n•\nIsolate area until gas has dispersed.\nFIRST AID\nRefer to the “General First Aid” section.\nSpecific First Aid:\n•\nIn case of burns, immediately cool affected skin for as long as possible with cold water. Do not remove\nclothing if adhering to skin.\nIn Canada, an Emergency Response Assistance Plan (ERAP) may be required for this product.\nPlease consult the shipping paper and/or the \"ERAP\" section.\nERG 2024\nPage 277","truncated":false,"body_characters":4223}