1 Apr This recommended practice covers recommended maintenance welding practices that may be used when repairing or installing. Find the most up-to-date version of API RP at Engineering Please discribe the difference between API AND API Title: ( Withdrawn) Pipeline Maintenance Welding Practices RP is now.
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Its edges shall be parallel and smooth.
API RP 1107 PDF DOWNLOAD
The surfaces to be welded are to be smooth; uniform; and free of laminations, tears, scale, slag, grease, paint, andother deleterious material which might adversely affect the welding. The size of the gas pocketsis not drawn to scale; for the proper dimensions, see 6. The welder is disqualified if the additional specimen also shows defects exceeding the specified limits.
If, in the opinion of the company, thefailure of a welder to pass the test was because of unavoidable conditions or conditions beyond his control, the weldermaybe given a second opportunity to qualify. Some suggested thickness groups are as follows: Filler metal and number beads.
The 110 and dryness of these atmospheres influence considerably the welding, so their value should besuitable for the process andbase metals. A change in the nominal material wall thickness from one group to another.
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This recommended practice represents the combined efforts of many engineers who are responsible for the design, construction, and operation of oil and gas pipelines, and the committee appreciatively acknowledges their whole-hearted and valuable assistance. Our suggestion engine uses more signals but entering a few keywords here will rapidly give you great content to curate. The diameter of the cluster exceeds inch Change in filler metal. Additional inspection methods may also be used.
Windshields may be used when practical. Pipeline Maintenance Agreement for Pipeline Crossing The welding may be done by shielded metal-arc welding, gas tungsten-arc welding, gas metal-arc welding, flux-cored arc welding, or oxyacetylene welding using a manual or semiautomatic welding technique or a combination of the techniques.
The minimum number of specimens and the tests which theyare to to be subjected are listed in Table 2. The type and minimum number of specimens are given in Table 3.
API Pipeline Maintenance Welding Practice
Save time by spreading curation tasks among your team. A weld in high-test pipe is considered acceptable if the cracked specimen is broken apart and its exposed surface meets the nickbreak-test acceptance criteria in 2.
Its edges shall be parallel 4 The sides shall be notched as shownin the optional specimen, and the cap. This record should be developed to suit the needs of the individual company and should be sufficiently detailed to demonstrate that the qualification test embodied the various requirements prescribed by this recommended practice.
Api rp 1107 pdf free download
The welding may be done by a shielded metal arc welding, submerged arc welding, gas tungsten arc welding, gas metal arc welding, flux-cored arc welding, plasma arc api rpoxyacetylene welding, or flash butt-welding process or by a combination of these processes using a manual, semiautomatic, mechanized, or automatic welding technique or api rp combination of aip techniques.
Joints paralleling the axis of the carrier pipe may be fitted with a suitable tape or mild steel backup strip to prevent the weld metal from being fused the surface of the carrier pipe.
Show whether the direction is uphill or downhill. Smooth and etch least one face of each at weld specimen crosssection with suitableetchant to give a clear definition to the weld structure. When conditions require it, preheating should be performed. The welding equipment, whether gas or arc, should be of a type and size suitable for the work and should be adequately maintained to ensure acceptable welds, continuity of operation, and safety of personnel.
The plunger is forced into the gap until the specimen is approximately U shaped. Changes other those givenin the folthan lowing may be made in 11107 procedure, and, as long asthe procedure specification is revised to show the changes, a requalification does not have to be made.
Cracks ture before testing.
A record is to be made of the tests given ep each welder and of the detailed results of each test. Arc-welding equipment must be operated within the amperage and voltage ranges given in the qualified welding procedure; gas-welding equipment must beoperated according to the flame characteristics and withinthe tip sizes given inthe qualified welding procedure.
A welder may pr required to requalify if there is a question about his ability. The compatibility of the base materials and filler metals should be considered of of the along with the effects the piping contents on the physical properties weld.
This is the suggestedwelding sequence; at the discretionof the company, others may be followed and circumferential welds 3 and 4 need not be made. This little book will answer those questions and more.