This Issue 2 is to replace the original Appraisal that had reached its expiry date.
This appraisal applies to Superlit Centrifugally Cast (CC) Glass Reinforced Plastic (GRP) jacking pipes for non-pressure applications manufactured to comply with ISO 25780:2011.
The pipes are joined using flexible non-end-load-bearing joints with elastomeric seals and are intended for non-pressure applications using various trenchless methods e.g. slip lining, micro-tunnelling and pipe jacking.
The jacking pipes considered in this Appraisal include nominal pipe diameters ranging from DN 400 to DN 1400 with nominal pressure classifications ranging from PN1 to PN10 with stiffness ratings ranging from 32,000 to 640,000 N/m2. Nominal jacking loads range from 50 tonnes to a maximum of 500 tonnes.
The pipes are available in 2 or 2.4 metre lengths but may be manufactured to order with a nominated length between 1.8 and 2.8 metres.