This appraisal applies to Hobas Centrifugally Cast (CC) Glass Reinforced Plastic (GRP) jacking pipes for pressure and non-pressure sewer applications manufactured to comply with ISO 25780:2011. This Issue 3 is to replace the original Appraisal that had reached its expiry date.
The jacking pipes considered in this Appraisal include nominal pipe diameters ranging from DN 250 (272 OD) to DN 3600 (3600 OD) with a nominal pressure classification of PN1 and stiffness ratings ranging from SN32,000 to SN1,000,000. Nominal jacking loads range from 20 tonnes to 2000 tonnes. Pipes with alternative pressure classifications up to PN16 can also be supplied.
The pipes are normally supplied in lengths of 1m, 2m, 3m or 6m but may be manufactured to order for alternative intermediate lengths.
Hobas offers stainless steel or GRP sleeve type flush couplings with incorporated EPDM seals for jointing the jacking pipes.