Interlocking Joint Pipes (SANS 677)

Global Precast Coastal manufactures interlocking joint pipes in 100D, from 300 mm to 1 500 mm nominal diameter. Sizes from 300 mm to 1 200 mm are supplied in a 2.4 m laying length, and the 1 350 mm and 1 500 mm pipes in 2.5 m. Pipe classes outside 50D and 100D can be manufactured on request.

Wall thickness runs from 30 mm on the 300 mm pipe to 130 mm on the 1 500 mm. Mass ranges from 91 kg/m (218 kg per pipe) at 300 mm to 1 684 kg/m (4 210 kg per pipe) at 1 500 mm, so confirm lifting capacity on site before delivery of the larger diameters. Masses shown in the table above are approximate and subject to manufacturing tolerances.

One detail worth catching at design stage: from 675 mm upward the inside diameter is smaller than the nominal diameter. A 1 350 mm ND pipe has a 1 290 mm ID, and a 1 500 mm ND pipe has a 1 410 mm ID. Check hydraulic calculations against the inside diameter in the table rather than the nominal size.

The male and female profiles seat inside the wall of the pipe, which keeps the joint flush with the barrel and allows pipes to be laid tight against one another without a separate collar. No lubricant or rubber ring is needed to make the joint.

Rubber collars are available on request where a project specification calls for additional protection at the joint. Because the joint is not water-tight, bedding and backfill should be specified to suit a flexible, non-sealed drainage line and to carry the imposed loads for the class selected.

1. Can interlocking joint pipes be used for sewer?

No. They are non-water-tight and are supplied for storm water drainage only. For sewer applications, specify a pipe with a sealed rubber ring joint.

2. Do you supply interlocking joint pipes in KwaZulu-Natal?

Yes. Global Precast Coastal supplies interlocking joint pipes from its factory in Port Edward to contractors, municipalities and consulting engineers across KwaZulu-Natal, with a sales office at 71 Old Main Road, Hillcrest for enquiries closer to Durban. Send your site location with your enquiry to confirm transport arrangements and lead times.

3. What sizes and laying length are available?

Class 100D from 300 mm to 1 500 mm nominal diameter. Sizes up to 1 200 mm are 2.4 m long; the 1 350 mm and 1 500 mm pipes are 2.5 m. Other sizes and pipe classes can be manufactured on request.

4. Are rubber collars supplied as standard?

No. Rubber collars are available on request and are quoted separately.