To avoid severe thermal strains and produce a ductile circumferential weld, some companies use an
overlapping back-stepping procedure. Even though the general weld progression may be from right to
left, short bead segments, 4 to 8 inches (10 cm to 20 cm) long, are deposited left to right, overlapping
half the previous welded bead. Another procedure used for the circumferential weld is buttering or
surfacing of the pipe with weld metal prior to welding the fillet root pass.
Non-Destructive Examination
It is important to follow ASME, construction codes, and any internal NDE requirements. Most codes
require the longitudinal weld seem to be 100% ultrasonically tested in-order to utilize the full strength of
the sleeve.
Longitudinal weld seams and circumferential fillet welds should be examined during welding to verify
proper fit-up, weld penetration, and fusion by a certified welding inspector.
At a minimum, all longitudinal weld seems should be examined using ultrasonic testing techniques.
Magnetic particle examination or dye penetrant testing should be performed on all completed fillet welds
in accordance with ASME Section V with acceptance criteria in accordance with the applicable code of
construction or post-construction code. Where there is the potential for hydrogen induced cracking or
delayed weld cracking, testing should be performed 24 hours after welding has been completed.
Re-pressuring
If the pipeline has been shut down, re-pressuring should be done with extreme caution. Re-pressuring
should be accomplished slowly and steadily without surges that could vibrate the pipeline or produce a
sudden impact load.
Storage Instructions
PLIDCO Sole+Mates should be stored in a dry environment to prevent the unpainted surfaces from
rusting.
Traceability
PLIDCO Sole+Mates, as with most PLIDCO products, have a unique serial number by which the fitting
is fully traceable.
IP-022
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