This Appraisal is for Wang Vari-Tap PN16 ductile iron tapping bands in sizes DN 100 and DN 150 with ¾” or 1” BSP tapped outlets.
This Issue 3 is a replacement for the previous version of the appraisal which had reached its 5-year expiry date.
The body consists of two segments manufactured from ductile iron and coated with a thermal bonded polymeric coating.
The Wang Vari-Tap tapping bands may be assembled with one of two configurations to suit either rigid pipes (Type R) or flexible pipes (Type F).
The Type F configuration is designed for application on Series 2 flexible pipes typically PVC-U, PVC-M and PVC-O.
The Type R configuration is designed for application on rigid pipes only, typically ductile iron (DI), grey cast iron (CI), asbestos cement (AC), ABS (≥ PN9) or GRP (≥ SN10,000).
The segments each incorporate a tongue and groove such that when assembled the Type F tapping band provides a full circle design around a flexible pipe. When the top is rotated 180 degrees to suit a Type R configuration, the tongues butt, creating an increased circumference to accommodate a wider range of pipe outside diameters. Type R configured tapping bands are not full circle and are therefore not suitable for flexible plastic pipes.
A watertight connection is achieved by a nitrile rubber seal with a combination lip / compression design. Assembly is completed using two Grade 316 stainless steel fasteners.