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- Hot_tapping abstract "Hot tapping, or pressure tapping, is the method of making a connection to existing piping or pressure vessels without the interruption of emptying that section of pipe or vessel. This means that a pipe or tank can continue to be in operation whilst maintenance or modifications are being done to it. The process is also used to drain off pressurised casing fluids.Hot tapping is also the first procedure in line stopping, where a hole saw is used to make an opening in the pipe, so a line plugging head can be inserted.Situations in which welding operations are prohibited on equipment which contains: Mixtures of gases or vapours within their flammable range or which may become flammable as a result of heat input in welding operations. Substances which may undergo reaction or decomposition leading to a dangerous increase in pressure, explosion or attack on metal. In this context, attention is drawn to the possibility that under certain combinations of concentration, temperature and pressure, acetylene, ethylene and other unsaturated hydrocarbons may decompose explosively, initiated by a welding hot spot. Oxygen-enriched atmospheres in the presence of hydrocarbons which may be present either in the atmosphere or deposited on the inside surface of the equipment or pipe. Compressed air in the presence of hydrocarbons which may be present either in the air or deposited on the inside surfaces of the equipment or pipe. Gaseous mixtures in which the partial pressure of hydrogen exceeds 700 kPa gauge, except where evidence from tests has demonstrated that hot-tapping can be done safely.Based on the above, welding on equipment or pipe which contains hazardous substances or conditions as listed below (even in small quantities) shall not be performed unless positive evidence has been obtained that welding/hot tapping can be applied safely.Substances Acetylene Acetonitrile Butadiene Caustic soda* Chlorine Compressed air at a pressure in excess of 3000 kPa gauge; Ethylene Ethylene oxide Fat/lean DEA/MEA; High pressure steam (pressure in excess of 5000 kPa (ga)) Hydrogen (partial pressure in excess of 700 kPa (ga)) Hydrogen sulphide* Hydrofluoric acid Oxygen Propene Propene oxide Sulphuric acid Toxic substances.*Constraints based on general hazard in the event of line puncturing during welding, not the welding process. Conditions: Vacuum conditions; Dissolved hydrogen in the pipe wall (e.g. due to service history); Pyrophoric scale deposits.Note: The above list is not exhaustive, but gives an indication only.".
- Hot_tapping wikiPageID "20154504".
- Hot_tapping wikiPageLength "3623".
- Hot_tapping wikiPageOutDegree "21".
- Hot_tapping wikiPageRevisionID "624970090".
- Hot_tapping wikiPageWikiLink 1,3-Butadiene.
- Hot_tapping wikiPageWikiLink Acetonitrile.
- Hot_tapping wikiPageWikiLink Acetylene.
- Hot_tapping wikiPageWikiLink Butadiene.
- Hot_tapping wikiPageWikiLink Category:Piping.
- Hot_tapping wikiPageWikiLink Category:Plumbing.
- Hot_tapping wikiPageWikiLink Caustic_soda.
- Hot_tapping wikiPageWikiLink Chlorine.
- Hot_tapping wikiPageWikiLink Compressed_air.
- Hot_tapping wikiPageWikiLink Ethylene.
- Hot_tapping wikiPageWikiLink Ethylene_oxide.
- Hot_tapping wikiPageWikiLink Hole_saw.
- Hot_tapping wikiPageWikiLink Hydrofluoric_acid.
- Hot_tapping wikiPageWikiLink Hydrogen.
- Hot_tapping wikiPageWikiLink Hydrogen_sulfide.
- Hot_tapping wikiPageWikiLink Hydrogen_sulphide.
- Hot_tapping wikiPageWikiLink Line_stopping.
- Hot_tapping wikiPageWikiLink Oxygen.
- Hot_tapping wikiPageWikiLink Piping.
- Hot_tapping wikiPageWikiLink Pressure_vessel.
- Hot_tapping wikiPageWikiLink Propene.
- Hot_tapping wikiPageWikiLink Propene_oxide.
- Hot_tapping wikiPageWikiLink Propylene_oxide.
- Hot_tapping wikiPageWikiLink Sodium_hydroxide.
- Hot_tapping wikiPageWikiLink Sulfuric_acid.
- Hot_tapping wikiPageWikiLink Sulphuric_acid.
- Hot_tapping wikiPageWikiLinkText "Hot tapping".
- Hot_tapping hasPhotoCollection Hot_tapping.
- Hot_tapping wikiPageUsesTemplate Template:Refbegin.
- Hot_tapping wikiPageUsesTemplate Template:Refend.
- Hot_tapping wikiPageUsesTemplate Template:Refimprove.
- Hot_tapping wikiPageUsesTemplate Template:Reflist.
- Hot_tapping subject Category:Piping.
- Hot_tapping subject Category:Plumbing.
- Hot_tapping hypernym Method.
- Hot_tapping type Article.
- Hot_tapping type Software.
- Hot_tapping type Article.
- Hot_tapping type Dynamic.
- Hot_tapping comment "Hot tapping, or pressure tapping, is the method of making a connection to existing piping or pressure vessels without the interruption of emptying that section of pipe or vessel. This means that a pipe or tank can continue to be in operation whilst maintenance or modifications are being done to it.".
- Hot_tapping label "Hot tapping".
- Hot_tapping sameAs Warminsnyding.
- Hot_tapping sameAs Piquage_en_charge.
- Hot_tapping sameAs m.04yfrwl.
- Hot_tapping sameAs Q3389067.
- Hot_tapping sameAs Q3389067.
- Hot_tapping wasDerivedFrom Hot_tapping?oldid=624970090.
- Hot_tapping isPrimaryTopicOf Hot_tapping.