Fabricated Steel Pipeline Repair Sleeves

Half Sole Repair Sleeves

Allan Edwards’ Steel Half Sole Repair Sleeves are designed to avoid a costly shut down. Existing lines can be cased without thru-put loss, because it is not necessary to shut down the carrier line to perform the required repair. A full scope of sizes, ASTM grades of steel plate (structural and pressure vessel quality), wall thickness and longitudinal edge options are available. Half Sole Repair Sleeves, also called split casing or half wrap, are custom-fabricated to your specifications, to assure a precision product and secure fit.

Half Sole is not a stock item. Every order is custom made.

When inquiring about this product, please provide the following information:

1. Carrier pipe O.D.
2. Grade of steel plate
3. Wall thickness
4. Type of longitudinal edge (contact us for options)
5. Total footage required specifying the total footage as Half Sole or Full Wrap

Material

Material used to form Half Sole are from Allan Edwards, Inc. stock structural quality carbon steel or pressure vessel quality carbon steel plates, which are to ASTM specifications, and in the following grades:

• ASTM A36 (structural; minimum yield 36,000 psi)
• ASTM A572 GR50 (structural; minimum yield 50,000 psi)
• ASTM A572 GR65 (structural; minimum yield 65,000 psi)
• ASTM A516 GR70 (pressure vessel; minimum yield 38,000 psi)
• ASTM A537 Class I (pressure vessel; minimum yield 50,000 psi) [limited stock]

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 weldability.

The maximum allowable carbon equivalency (CE) of Allan Edwards’ stock structural quality carbon steel plates will be based on the heat analysis.

The maximum allowable carbon equivalency (CE) of Allan Edwards’ stock pressure vessel quality carbon steel plates will be based on the heat analysis, in most cases.

Upon receipt of stock steel plates, heat numbers will be checked and verified with the material test reports. Copies of material test reports will be kept on file and will be used to recheck and re-verify heat numbers prior to cutting material in first step of manufacture.

Manufacturing

Half Sole 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 Sole ends have sheared square edges for fillet welding, unless square end bevel is requested, and are available in maximum lengths of:

Backing Strips

Backing strips are hot rolled commercial carbon steel sheet and strip of commercial quality, A-569/A1011 SS GR33 in coils and cut lengths having a maximum carbon of 0.15%. 1 1/4" wide, 16 gauge (.0598) with a tolerance of: min. .0538 - max. 0658, 10' long, pre-crimped (10 degree total bend).

ASTM steel composition of A 569/A1011 SS GR33:

Mechanical Properties and Testing

Mill test reports will be furnished on all materials. Stock plate is not available with a maximum hardness guarantee. Independent testing may be performed to check the hardness on stock plate. Additional independent testing available to include: destructive, magnetic particle, liquid penetrate, ultrasonic and radiographic.

Dimensional Requirements

Longitudinal edges are beveled to 30 degrees (+5 degrees -0 degrees), with a root face (land) of 1/16" (+-1/32"). This will be a mechanical type bevel or by plasma torch burning. Beveled ends are available upon request. Inside diameter (I.D.) of each Half Sole is fabricated to match the outside diameter (O.D.) of standard nominal line pipe (bare) with tolerances of:

Half Sole are manufactured so that when two (2) halves of the sleeve are placed on the pipe, their total circumference shall equal the circumference of the pipe minus a gap between the longitudinal edges on either side of 1/16" (-1/16"+1/32") for welding.

Examination

The Half Sole are thoroughly inspected visually for defects before shipment. All dimensions, including end and side preparation, are measured and verified. Any sleeve not meeting the requirements for visual inspection or dimensional tolerance are rejected.

Marking and Shipping

Each piece of Half Sole are clearly marked with size, wall thickness, grade of steel plate, Allan Edwards’ job number and customer purchase order number. All marking are made with permanent paint and the lettering shall be approximately one (1") inch high.

The Half Sole will be secured with steel banding and stacked in bundles of:

The Half Sole O.D. size and wall thickness will determine the use of nominal pieces of softwood between adjacent half sole pieces in a bundle to mitigate rubbing and abrasion during shipping.

Half Sole can be transported in a variety of ways to include LTL (class A, closed bed truck), oil field hauler (flat bed truck) or air freight. The method of transportation is dictated by the total weight of the order and/or the size of the sleeves.

Half Sole Installation

Preliminary Half Sole Preparation

After the Half Sole length has been determined and the sleeve has been cut (torch cut in the field), the circumferential ends are prepared. The backing strips, equal to the length of the half sole, are tack welded to the sleeve with one half designated for the bottom portion of the fitting. Tack weld shall be made in the groove of the weld prep side of the long seam of the fitting. The backing strip is pre-crimped and the legs of the "V", provided by the crimping, should face the inside radius of the fitting. The backing strip are centered in both directions of the length and the width of the strip before tack welding into position.

Trial Fit-Up

Half Sole position — the bottom half of the Half Sole (with backing strip attached) are placed under the carrier pipe with the edges of the backing strip barely touching both sides of the pipe. Plate clamps are beneficial in positioning the top Half Sole and can be driven from under the top Half Sole when the proper position is obtained. Spreader bar rigging should be considered when handling long Half Sole sections.

The top half are then be positioned over the carrier pipe using wedges on the ends of the top half of the Half Sole longitudinal seam to provide clearance for the backing strip (when the Half Sole is in position and down on the pipe) to fit underneath the top Half Sole half.

Clamping

Once the Half Sole halves are in close proximity of the carrier pipe, the chain clamps shall be positioned around the Half Sole. Recommended chain clamps should be fabricated of a diamond, double roller type chain and be of sufficient length to allow for the anticipated application of fitting-up the two (2) Half Sole halves. The tightening mechanism should be of the mechanical wrench bolt type, (the hydraulically driven type could be used) and supported by a metal shoe contoured to the shape of the Half Sole/pipe.

The clamps are tightened at an equal rate on each clamp until the Half Sole has cleared the backing strip. At this point the wedges can be removed. Tightening in a uniform fashion shall be continued until the Half Sole is firmly in position. (Do not over tighten!)

Checking Line-Up and Gap

The longitudinal welds of the Half Sole may require positioning at positions other than three and nine o’clock. The gapping of the Half Sole weld groove is critical (longitudinal edges). The gap should be 1/16" (-1/16" +1/32") on each side. To obtain this gap, due to the variances in pipe O.D. tolerance, may require reduction of groove width by grinding or increasing the width utilizing a buttering technique. Be sure that circumferential ends of the Half Sole are a tight fit.

After the gap is visually checked for dimensional tolerances and any final adjustment made, the longitudinal seam shall be tack welded. The tack weld should tie-in both Half Sole edges and the backing strip material (caution is necessary not to burn through the backing strip to the carrier pipe). A welding machine setting should be made before starting the tacking process.

Allan Edwards, Inc.
2505 S. 33rd W. Ave.
Tulsa, OK  74157-0457

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