PRE-STRESSED METALLIC SLEEVE
The pre-stressed sleeves are of full encirclement split type and are manufactured by a production process, that minimizes occurance mill defects. Axial edges of the sleeves are bevelled to form 60° weld angle on assembly for the horizontal butt joint. A recess on the inner side of each pair of half sleeves is machined (cut out) to accommodate a 3 mm thick by 18 mm wide backing strip along the horizontal joint. The backing strips are manufactured from the same material as the sleeves and supplied. Circumferential edges of the sleeves is pre- fabricated to form 90° lap joint with the pipe.
The internal diameter of the sleeves is designed and constructed so as to fit on the pipe withour leaving a gap between the inner surface of the sleeve and outer surface of the pipe all around.
On assembly prior to welding, the maximum root gap shall be 3.0 mm on both horizontal joints. A 1.5 mm root face shall be allowed on both edges.
Both the horizontal and circumferential edges shall have a smooth finish.
The sleeve surfaces shall be protected from corrosion by a suitable method such as coating with corrosion resistant paint or other acceptable methods.
FEATURE
The steel repair sleeves can be used for internal and external corrosion, gouges, dents, grooves, arc burns, cracks, defective girth
welds, laminations and leaks. Pressure containing sleeves feature a wall thickness equal to or greater than required for the maximum allowable operating pressure or the full strength of the pipe being repaired. The steel Repair sleeve material is certified and the carbon equivalent will not exceed 0.45 percent. Each half-sole segment comes with one pre-crimped back-up strip.
Steel Repair Sleeves can be used as pads or cradles for above ground piping, drain tile supports and patches (segments in 90° and 180° arcs, from 6-inches to 10 feet in length are available as specials).
Each Steel Repair Sleeve has standard bevels with a back-up strip and material certifications. Sleeve ends are square cut. Back-up strip are not included with Standard Girth Weld Steel Repair Sleeves but are available as special order.
MATERIAL
Material used are structural quality carbon steel or pressure vessel quality carbon steel plates, which are to ASTM specifications, and in the following grades:
API 5L Gr B, X42, X46, X52, X56, X 60, X 65, X70 – PSL 1 – PSL2 (minimum yield 42000 / 52000 / 60000 / 65000 / 70000)
ASTM A36 (structural; minimum yield 36,000 psi) ASTM A572 GR42, GR50, GR55, GR60, GR65 (structural; minimum yield 29,000 psi) ASTM A516 GR55, GR60, GR65, GR70 (pressure vessel; minimum yield 38,000 psi) ASTM A537 Class I, Class 2, Class 3 (pressure vessel; minimum yield 50,000 psi) EN 10025 – S235, S275, S355, S450
The chemical composition does not exceed the percentages specified for the ASTM material ordered. Repair sleeves are fabricated from plate with low carbon equivalency for good weld ability.
The maximum allowable carbon equivalency (CE) quality carbon steel plates will be based on the heat analysis. The maximum allowable carbon equivalency (CE) pressure vessel quality carbon steel plates will be based on the heat analysis, in most cases.
Note : The sleeve can be manufactured in any grade as per the application & client requirements.
MANUFACTURING
Half Repair Pipe Sleeve is formed by rolling, step braking, or die forming without the use of heat treating.
Longitudinal edges of the Half Sole are beveled for welding, if requested, at 30º. The bevel are a mechanical type and/or produced by plasma torch burning.
Half Repair Pipe Sleeve ends have sheared square edges for fillet welding, unless square end bevel is requested, and are available in maximum lengths as per clients requirements.
SIZE
For Pipe Size : 1” NB & Above Thickness 4 mm & Above
TYPICAL APPLICATION
Repair, Permanent, Splits, Holes, Punctures, Corroded Areas, Inferior Welds, Gouges
TEST METHODS
a) Chemical Analysis Test
The method for material chemical analysis is done as per ASTM A751. This is as per API 5L standard section 9.10 subsection one.
b) Tensile Test
Our test Method for material tensile test is done as per ASTM A370. This is as per API 5L standard section 9.10 subsection two
c) Equipment Calibration
This is done within 15 months according to ASTM E4 under API 5L standard section 9.10.2.2
d) Guided Bend Tests
Shall be performed to conform to API 5L standard section 9.10.3 and within subsequent reference
e) Charpy Tests
Shall be performed in accordance with ASTM A370 as per API standard section 9.10.4
f) Other tests
Invalidation of Tests (as Per API 5L 9.11.1/2) , Retests (i) Recheck Analysis API 5L 9.12.1 (ii) Recheck Analysis API 912.2 , Flattening Tests ( API 5L 9.12.3) , Bend Retest (API 5L 9.12.4) , Guided Bend Retest ( API 5L 9.12.5) , Charpy Rest ( API 5L 9.12.6) , Reprocessing ( API 5L 9.13)
Contact for Pipe repaire Leak.
For more details on the products contact us.
Half Pipe Sleeve, Half Repair Pipe Sleeve, Pre-Stressed Metallic Sleeve.