This Appraisal is for the Viking Johnson UltraGrip range of polymeric coated ductile iron wide tolerance restrained flexible joint couplings manufactured to EN 14525:2004 Ductile iron wide tolerance couplings and flange adaptors for use with pipes of different materials: ductile iron, Grey iron, Steel, PVC-U, PE, Fibre-cement.
The range of couplings submitted is for DN 40 to DN 600 sizes suitable for joining DI, AC, CI, PE and steel pipes with outside diameter variations up to 54mm.
When the couplings are used on PE pipes a Grade 316 stainless-steel support sleeve, supplied by Viking Johnson, is required to be inserted into the end of the pipe prior to installation of the coupling.
Viking Johnson literature advises suitability for PVC and GRP pipes, however WSAA does not recommend the use of gripping mechanisms on PVC or GRP pipes, due to the known propensity of failure at points of induced scratches or scores in the pipe wall. Accordingly, the use of UltraGrip couplings on PVC or GRP pipes is not endorsed in this Appraisal.
DN 40 to DN 300 couplings are rated as PN16 whilst larger sizes are rated as PN10 with an allowable joint deflection of 4 degrees on each end.
The range of couplings submitted is for DN 40 to DN 600 sizes suitable for joining DI, AC, CI, PE and steel pipes with outside diameter variations up to 54mm.
When the couplings are used on PE pipes a Grade 316 stainless-steel support sleeve, supplied by Viking Johnson, is required to be inserted into the end of the pipe prior to installation of the coupling.
Viking Johnson literature advises suitability for PVC and GRP pipes, however WSAA does not recommend the use of gripping mechanisms on PVC or GRP pipes, due to the known propensity of failure at points of induced scratches or scores in the pipe wall. Accordingly, the use of UltraGrip couplings on PVC or GRP pipes is not endorsed in this Appraisal.
DN 40 to DN 300 couplings are rated as PN16 whilst larger sizes are rated as PN10 with an allowable joint deflection of 4 degrees on each end.