Pipe Ovality
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Moderate ovality, especially in large diameter steel or ductile iron pipes, can frequently be rectified by selective bolt tightening to give a uniform annular gap between pipe and coupling. More severe ovality, up to a limit of about ±1% of diameter, may be corrected by jacking, taking care not to damage the internal lining of the pipe. Pipes having local stiffening near the ends may be impossible to correct or shape by these methods and good circularity is essential if couplings are to be fitted successfully.
Viking Johnson MaxiFit, MegaFit and UltraGrip ranges of Universal Coupling products can accommodate larger pipe tolerances and ovality (see product brochures for details).
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