rambabu0608
Petroleum
Dear Forum Members,
We would like to hear from the forum experts that, Is HDPE pipe outer diameter (OD) will get shrink after manufacture with time and temperature? If so, what could be the problem?
We have received huge quantity of various sizes of pipes (OD 110 - 400 mm, SDR 36,) from a manufacturer around 8 months before for which the Outer diameter of pipes were found in specified standard limits during production and pipes were produced under controlled process conditions. The temperature of pipes was at almost ambient conditions (@ 25 - 30 Deg.C) when measured 100% pipes before despatch during manufacturing through Third-party inspectors (TPI) services. These pipes shall be used for lining services inside carbon steel spools where the OD of Pipes acts a major role.
But now , we have found reduction in outer diameter (1.5 - 3.0 mm) for all pipes irrespective of pipe size.
(Temp. at site was 15 - 18 Deg.C)
The reduction in Outer diameter of pipe is 1.0 mm for smaller size for 110 mm and 2.5 - 3.0 for 400 mm pipes..
Please lets know the technical justification for reduction of outer diameter of HDPE pipes.
Thanks in Advance.
RAM
We would like to hear from the forum experts that, Is HDPE pipe outer diameter (OD) will get shrink after manufacture with time and temperature? If so, what could be the problem?
We have received huge quantity of various sizes of pipes (OD 110 - 400 mm, SDR 36,) from a manufacturer around 8 months before for which the Outer diameter of pipes were found in specified standard limits during production and pipes were produced under controlled process conditions. The temperature of pipes was at almost ambient conditions (@ 25 - 30 Deg.C) when measured 100% pipes before despatch during manufacturing through Third-party inspectors (TPI) services. These pipes shall be used for lining services inside carbon steel spools where the OD of Pipes acts a major role.
But now , we have found reduction in outer diameter (1.5 - 3.0 mm) for all pipes irrespective of pipe size.
(Temp. at site was 15 - 18 Deg.C)
The reduction in Outer diameter of pipe is 1.0 mm for smaller size for 110 mm and 2.5 - 3.0 for 400 mm pipes..
Please lets know the technical justification for reduction of outer diameter of HDPE pipes.
Thanks in Advance.
RAM