For the abovementioned reasons, the Contractor CM: CN requested the Engineer Directorate: Civil Engineering to change the pipe material from steel to GRP for NR6 pipelines. The Directorate Civil Engineering was hesitant and concerned about granting the approval to use the GRP pipes on large diameter high pressure primary pipelines. Thus, it was specified to the Contractor that the NR6 pipeline must be laid and tested strictly in accordance with Specification DWS1150 and that the Manufacturer must provide an extended ten year guarantee on their products.