How can I verify details of the pipes and fittings that have been installed?

Good Quality Assurance by the contractor is necessary to achieve this.

The contractor should record location of pipes to provide suitable location in the future and this should be carried out in accordance with the operator's or contractor's QA system. Normal practice is to record the location on maps and this is now made easier with GPS systems.

Although it may not be necessary to record details of individual pipe lengths, other than diameter and PN rating, it may be beneficial to record joint and fitting locations. The record of the joint and fitting location can be used in conjunction with jointing data logging facilities to provide a cross-reference with the pipe and fittings installed.

Information on Traceability - link to PE pipe : Pipe origin and fittings