Drying times for cemented pressure pipe joints
Often, pipe engineers come across situations where a modification or repair needs to be made, but the plant can only be shut down for a short period. In such instances we are often asked the question of how long, after cementing the pipe and fitting together, can the pressure be put back on.
The following is a guide to drying times to reach certain pressure and should be used as an approximation. Ambient and process fluid temperatures will have a bearing on these times which are based on a system with an ambient temperature of between 10 and 40 degrees C and a process fluid of approximately 20 degrees C.
|3/8 - 2 1/2"||3" - 4"||6"||8"||>8"|
|ABS Pipe||30mins / bar pressure||1 hour / bar pressure||1 1/2 hours / bar pressure||2 hours / bar pressure||48 hours minimum|
|PVC Pipe||1 hour / bar pressure||1 hour / bar pressure||1 1/2 hours / bar pressure||2 hours / bar pressure||30 hours minimum|
Using the above table : For example if a 2" pipe is to operate at 2 bar it needs 2 hours setting time (1 hour x 2 bar)