Pipe Fittings Manufacturer for Worldwide Distribution

Technical Manual

KLAMFLEX Couplings and Flange Adaptors can be manufactured to suit almost any pipe outside diameter or flange drilling.

Information given in our catalogue generally only refers to Couplings for standard size pipe. Couplings and Flange Adaptors are manufactured to suit all standard pipe sizes. Where Couplings are required for pipes in non-standard sizes and material or where standard outside diameters are not exact, e.g. GRP and AC pipe, details of the actual pipe OD's and tolerance should be stated for consideration by KLAMFLEX Pipe Couplings.

Design consideration should be given to the surface finish of pipe materials. By its very nature the KLAMFLEX Coupling system relies upon good surface contact of the sealing rings, and consideration must be given to pipe end preparation on pipes with naturally rough or uneven surface finish. Where surface dressing is required to remove weld beading, care must be taken not to overdress the pipe end causing pitting or flat spots. In general the recommendations of SABS 719-1971 and BS 534-1990 section 15 ensures a satisfactory surface finish.

Ovality, especially in larger diameter pipes, can frequently be rectified either by jacking out, if the ovality is severe, or by rounding out by selective bolt tightening to give a uniform angular gap. Care must be taken when jacking so that internal finish is in no way damaged. Pipes which have local stiffening near the ends are sometimes impossible to correct for ovality.

Most rigid and semi-rigid pipe materials can be joined with KLAMFLEX Couplings, e.g. steel, grey and ductile iron, asbestos cement, uPVC, GRP, concrete, etc. Some materials such as GRP need special consideration due to the structural strength of the material. KLAMFLEX Couplings can be used on both above and below-ground pipes but different design criteria apply. The following sections give some guidance on how to get the best use from KLAMFLEX Products.