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Idiomas disponibles
Idiomas disponibles
For repairing a leaking defect using a Type B Sleeve, the defect area must be isolated prior to
welding. For lines with flammable contents, the sleeve must be purged with nitrogen or other
inert gas to prevent the formation of a combustible mixture under the sleeve.
1.
Identify and size the location of the Sole+Mate position on the carrier pipe. The ends of the sleeve
must extend past the edge of the defect for a minimum of 2" (50mm) as shown in Figure 3. When
multiple Type B sleeves are used, the end of a Type B sleeve shall not be terminated within one-
half of a pipe diameter or 4" inches (102mm) from a girth weld, whichever is greater (see Figure 9).
The distance between 2 sleeves should be at least one pipe diameter. (see step 8 for options to
extend the coverage length of a single Sole+Mates.)
2.
The pipeline should be ultrasonically tested to verify sufficient wall thickness prior to welding to
prevent burn through.
3.
Thoroughly clean the carrier pipe surface to bare metal where the sleeve will be circumferentially
welded. The carrier pipe must be cleaned at least 1" beyond the circumferential welds. Any defects
such as gouges, dents, or other distortions in the carrier pipe that would prevent the sleeve from
fitting properly must be removed or mitigated appropriately. Grind any existing weld seams in the
carrier pipe down to the outside diameter of the carrier pipe without reducing the pipes wall thickness
to achieve proper fit.
4.
It can be helpful to tac-weld the backing strips onto the bottom half of both longitudinal weld bevels
of the sleeve as shown in Figure 4. Position the backing strip with approximately half of the backing
strip above the bevel.
Field Welding Preparations
Figure 3
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IP-022
Revision 1
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