Choosing a Repair Clamp: Application Fit and Specification Checks

Start with your own requirements

Get these details ready before you compare products:

• Pipe material. Steel, cast iron, ductile iron, asbestos cement, copper, plastic or another material.
• Damage type. A pinhole leak, a crack, a perforation or a full circumferential break.
• Pipe outside diameter. Measure the actual pipe, because the products are listed by diameter range.
• Operating pressure. Including whether the repair has to be made while the line stays under pressure.
• Medium. The published materials describe these products as suitable for water and sewage. Check any other medium with the supplier.
• Repair length. How long a section of pipe needs to be covered.

The three options

Standard model ("Repair Clamp")

This model is described as an economical and permanent way to repair damaged pipes, from pinhole leaks to full 360° circumferential breaks. The product description lists steel, cast iron, ductile iron and asbestos cement pipe as suitable. It also says the model can repair service pipe connections even under operating pressure, without interrupting the supply. It is described as lightweight, easy to handle and reusable, and it is also presented as a permanent solution for water and sewage lines.

Listed materials of construction: stainless steel clamp body, NBR rubber sealing, and stainless steel bolts, nuts and washers. To install it, you center the flexible rubber pad over the hole, place the metal body over the pad, and tighten the two screws and nuts until the pad is compressed over the hole.

Stainless Steel Single Band model

The single band design is described as suitable for repairing pinholes and breaks caused by aging or rust. It can seal under pressure without replacing the pipe, and the description says it has few requirements on the ellipticity of the pipe arc. The product information says it is made from stainless steel and comes in a wide range of sizes.

The published specification table (series CR-1) lists diameter ranges starting at 59-67 and going up to 356-366. Pressure is listed as 16 bar for ranges up to 248-258 and 10 bar for 250-260 and larger. Length is 150-600 mm for the smaller ranges (up to 86-94) and 150-2000 mm from 108-118 upward.

Limitation: The description says it can be installed without other tools, but it also says to tighten the bolts. Ask the supplier which installation tools you need.

Ductile Iron Jaw model

The jaw design is described as a fast, economical repair for fractures, perforations and cracks on iron, steel, copper, aluminum, plastic, glass fiber and other pipelines. If you need a copper pipe repair clamp, this is the only one of the three whose published information names copper pipe.

Its specification table (series ZR-1) lists the same diameter, pressure and length ranges as the CR-1 table: 16 bar up to the 248-258 range and 10 bar from 250-260 to 356-366. Packaging information says labels can follow the client's requirements, with individual bubble plastic bags, EPS protection inside pallets, and cartons placed between layers.

Limitation: The product name refers to ductile iron, but the product details list a stainless steel clamp body, NBR sealing and stainless steel bolts, nuts and washers. Confirm the body and jaw material in writing before you order.

Comparison at a glance

Practical selection notes

• Pressure: If you need high pressure pipe repair clamps, the published tables only go up to 16 bar, and larger diameters drop to 10 bar. If your line runs above the listed value for your size, these products do not apply unless the supplier confirms otherwise.
• Diameter units: The tables give length in mm, but they do not give a unit for the diameter ranges. Confirm the unit and measure your pipe's outside diameter before you choose a size.
• Live repairs: For emergency work that has to be done without shutting down the supply, the standard and single band descriptions mention repairing or sealing under pressure. Confirm the conditions for your own line.
• Medium: The materials name water and sewage. They do not cover gas, chemicals or other media.
• Not covered here: Pricing, lead times, certifications and test reports are not part of the published product information. Ask HEBEI YONGQIAN TRADING CO.,LTD. for them directly.

For current specifications and to discuss your requirements, contact HEBEI YONGQIAN TRADING CO.,LTD. through www.hbyqmetal.com.