Pre-stressed metallic sleeve
We manufacture the Pre-stressed metallic sleeve as a full encirclement split type using a production process that minimizes the occurrence of mill defects. We bevel the axial edges to form a 60° weld angle upon assembly for the horizontal butt joint. On the inner side of each pair of half sleeves, we machine a recess to accommodate a 3 mm thick by 18 mm wide backing strip along the horizontal joint. We fabricate and supply these backing strips from the same material as the sleeves. We also pre-fabricate the circumferential edges of the sleeves to form a 90° lap joint with the pipe.
We design and construct the internal diameter of the sleeves to ensure a snug fit on the pipe, eliminating any gap between the sleeve’s inner surface and the pipe’s outer surface. Before welding, we maintain a maximum root gap of 3.0 mm on both horizontal joints and allow a 1.5 mm root face on both edges. We finish both the horizontal and circumferential edges smoothly to ensure proper welding and fitment.
The sleeve surfaces shall be protected from corrosion by a suitable method such as coating with corrosion resistant paint or other acceptable methods.
Features of Pre-stressed metallic sleeve
Engineers use Steel Repair Sleeves to effectively address internal and external corrosion, gouges, dents, grooves, arc burns, cracks, defective girth welds, laminations, and leaks. These pressure-containing sleeves feature wall thicknesses equal to or greater than what is required for the maximum allowable operating pressure—or the full strength of the pipe being repaired—ensuring reliable and lasting performance.
Moreover, we certify the steel repair sleeve material and ensure that the carbon equivalent does not exceed 0.45 percent. Each half-sole segment includes one pre-crimped back-up strip, adding further structural integrity. In addition, professionals also use Steel Repair Sleeves as pads or cradles for above-ground piping, drain tile supports, and patches. We offer custom segments in 90° and 180° arcs, with lengths ranging from 6 inches to 10 feet, to accommodate specific repair requirements.
Furthermore, each Steel Repair Sleeve comes with standard bevels, a back-up strip, and full material certifications. We square-cut all sleeve ends for precision and easy installation. While Standard Girth Weld Steel Repair Sleeves do not include back-up strips by default, we offer them as a special order. Alongside these options, we also manufacture the Pre-stressed metallic sleeve, offering a high-strength, precision-engineered solution for advanced pipeline reinforcement needs.
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
We ensure that the chemical composition does not exceed the percentages specified for the ASTM material ordered. Additionally, we fabricate repair sleeves from plates with low carbon equivalency to ensure good weldability.
For quality carbon steel plates, we base the maximum allowable carbon equivalency (CE) on the heat analysis. Likewise, for pressure vessel quality carbon steel plates, we also determine the CE based on the heat analysis in most cases.
Note: We can manufacture the sleeve in any grade, based on the application and client requirements.
Manufacturing of Pre-stressed metallic sleeve
We form the Half Repair Pipe Sleeve by rolling, step braking, or die forming—and notably, this is done without applying any heat treatment. When required, we also bevel the longitudinal edges of the Half Sole at 30º to prepare them for welding. These bevels are either mechanically produced or alternatively created using plasma torch burning for enhanced precision.
Furthermore, the ends of the Half Repair Pipe Sleeve feature sheared square edges suitable for fillet welding. However, upon request, we can also provide square-end bevels. In addition, we supply sleeves in maximum lengths, specifically tailored to meet each client’s individual 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
We perform the material chemical analysis using the method specified in ASTM A751. This procedure complies with API 5L standard, Section 9.10, Subsection 1.
b) Tensile Test
We conduct the tensile test for materials in accordance with ASTM A370. This test follows the requirements of API 5L standard, Section 9.10, Subsection 2.
c) Equipment Calibration
We calibrate all relevant equipment within a 15-month period as per ASTM E4, in line with API 5L standard, Section 9.10.2.2.
d) Guided Bend Tests
We carry out guided bend tests to meet the requirements set in API 5L standard, Section 9.10.3 and subsequent referenced standards.
e) Charpy Tests
We perform Charpy impact tests in accordance with ASTM A370, as mandated by API 5L standard, Section 9.10.4.
f) Other Tests
We follow specific procedures for conducting additional tests to ensure compliance and maintain product integrity. First, we invalidate tests in accordance with API 5L Sections 9.11.1 and 9.11.2, as part of our commitment to quality assurance. If required, we proceed with a series of retests to verify results. These include a Recheck Analysis conducted under API 5L Sections 9.12.1 and 9.12.2. Additionally, we perform a Flattening Test as per the guidelines outlined in API 5L Section 9.12.3. Furthermore, we carry out a Bend Retest in accordance with API 5L Section 9.12.4. Through these structured steps, we ensure that all materials meet the highest standards of performance and reliability.
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Half Pipe Sleeve, Half Repair Pipe Sleeve, Pre-Stressed Metallic Sleeve.