Fit and forget: Wang Repair Clamps

Australian-made Wang repair clamps, manufactured at Wangaratta, Victoria, are ideal for permanent repair for leaking pipeline systems DN40–DN1200.

These clamps come in a wide range of widths, 150–1200 mm, and provide a stable repair solution for most leaking, cracked or damaged pipes. They are also an effective means of reinforcing old pipes in critical areas or providing an effective seal for decommissioned service connections.

Colin Cheesman, AVK Product Specialist said, “To assist you in selecting the correct clamp, AVK has developed a repair clamp selection guide along with guidance around recommended sealing dimensions, to ensure there is sufficient contact between the edge of the area to be repaired and the end of the clamp.”

Manufactured using high-quality stainless steel and Nitrile rubber gaskets permits the use of the product in a range of applications from reticulated water and sewerage to industrial use. A repair clamp’s variable OD range enables a single clamp to adapt to any pipe OD within that variable range. This dramatically reduces the stocking requirement to cater to each pipe type and size.

Main features and benefits:

• Manufactured from grade 316 stainless steel for superior corrosion protection
• Nitrile rubber gaskets provide a potable water contact approved seal and insulate against galvanic corrosion
• Fully passivated stainless steel underscores the quality and longevity of the product
• Clamp design permits the installation of a single clamp on a range of pipe diameters
• All sharp surfaces finished avoiding injury to the installer
• Product supplied with detailed installation instructions
• Dry film anti-galling coated studs and PTFE coated nuts employed to minimise galling of the stainless steel fasteners
• Manufacturing facility certified to the ISO 9001 quality assured standard
   

Colin Cheesman went on to say, “When repairing a damaged pipe, it is important to select a clamp of the right length relative to the length of the damage being repaired. For effective sealing, there should be sufficient gasket in contact with the pipe between the edge of the damage and the end of the clamp on each side.”

The diagram and table below provide a method of ensuring that the selected clamp is no less than the minimum recommended length for an effective seal. Minimum recommended clamp length = A + 2B.

Example: Calculating the minimum clamp length. You require a clamp to repair a DN300 Sr.2 PVC pipe with a 100 mm wide hole.

1. Determine the minimum required clamp length with the formula (A+2B).

A = Damage dimension

A = 100 mm

B = Seal length (extract from table above)

A = 100 mm

Therefore, MINIMUM clamp length A = (100 + [2x100]) = 300 mm.

2. Standard clamp length from the table above for a DN300 pipe = 300 mm. Therefore, a standard clamp from the repair clamp selection chart can be used.

3. However, if the damage had been more than 100 mm in length, a standard clamp (300 mm long in this example) would be too short.

AVK can guide you in calculating the correct clamp length, selecting the correct Wang clamp and can customise products to suit specific applications.

AVK Wang is proud of the reputation of having ‘The Original and the Best’ couplings, repair clamps, tapping saddles, and speciality products for pipelines in Australia and New Zealand.

Download the Wang repair clamp selection guide.

Top image caption: Wang Repair clamps in production. Family photo of product.