API RP 2201:2010 pdf download

API RP 2201:2010 pdf download.Safe Hot Tapping Practices in the Petroleum and Petrochemical lndustries.
8.1 WRITTEN PLANS
Prior to conducting welding or hot tapping on piping or equipment in service, a written plan should he prepared which includes at least the following:
a. Connection design. location and carrier thickness
b. Hot tap procedure.
c. Detailed written welding procedure (qualified in accordance with the applicable code) documenting heat input, as appropriate.
d. Health, safety, fire protection. emergency response. and other appropriate procedures and instructions, including owner and user requirements.
Additional infomation when developing a written plan may be obtained from relevant codes and standards for qualification of welders and the fundamental ASME Code welding procedures to he employed. Some of these may he found in Section IX of the ASME Boiler and Pressure Vessel Code. For pipelines, API RP 1 104 and API RP 1107 also address qualification of welders and the welding procedures to be employed when welding on new and in-sen’icepipelines containing flammable and combustible liquids.
8.2MANAGEMENT OF CHANGE
During the Job Analysis and associated review by qualifiedpersons，consideration shall be given to hazards that may beintroduced to the process system as the result of planned use ofthe hot tap connection.This “Management of Change”reviewshould conform to facility and regulatory requirements.Thereview should address any potential longer-term concernsrelated to the revised equipment as well as possible short termeffects during the hot tapping itself.
8.3 PERSONNEL COMPETENCY AND
QUALIFICATIONS
Hot tap machine operators and welders must be qualifiedin accordance with applicable codes and specifications.Theyshould be thoroughly familiar with the welding and hot tapequipment and procedures to be used.Only skilled competentpersonnel should mount and assemble the hot tappingmachine. These skills may be achieved either through on-the-job training or by a formal training program provided by themanufacturer of the hot tapping machine.As noted in previ-ous sections, certain aspects of the job analysis and planninginvolve participation and approval by both competent andqualified persons.
9.1 HOT TAPPING AND WELDING ON TANKS OR
VESSELS
Welding on the exterior of tanks or vessels in service shallnot be conducted unless controls are established and in placeto prevent flammable vapors from reaching the area of weld-ing. Work must be stopped immediately should any flamma-ble vapors be detected in the welding area.
Hazards associated with welding or hot tapping on tanks inoperation include (but are not limited to) the following:
a. Tank venting, with vapors reaching the work area wherewelding is taking place.
b. Product within the tank rising and overflowing.
c. Inadvertently allowing the liquid level within the tank tofall below the point of welding, thereby losing the heat sinkprovided by the liquid and exposing the vapor space withinthe tank to an ignition source.
Welding should not be conducted above the liquid level oron a vessel which is double walled and/or which has an inter-nal lining such as glass,polymeric or alloy cladding untilinspection and analysis are made by a qualified person to determine whether it is possible to perform the work safely.Ifwelding and hot tapping is to be done on the outside surfaceof a vessel, and if the area is otherwise safe for the use of anopen flame, the following precautions should be employed:a. Pressure within the vessel shall be maintained in a rangedetermined to be acceptable by a qualified person during thejob analysis.
b. Atmosphere within the vessel shall be incapable of beingignited because it is too rich or too lean or is non-combustibleor non-reactive as determined during job analysis and associ-ated reviews based on chemical analysis or other reliableevidence.
c. Welding should not be performed on metal contacting avapor space without a heat sink.
d. Liquid level in the tank shall be maintained at least 3 ft( 1 m) above the area where the work is being performedwhen welding or hot tapping on atmospheric tanks in ser-vice (because of the potential danger of creating anexplosive atmosphere inside the tank vapor space).
e. To the extent possible the tank should be static with noflow in or out.