Technical Information > Pressure Temperature

Pressure Temperature Relationship


Where the carried in a pipeline is 20°C and the ambient temperature is higher 20°C – the maximum working pressure should be reduced by 1½ per degree above 20°C. The ambient temperature is above 20°C.



Where the carried in a pipeline is 20°C and the ambient temperature is 20°C – the maximum working pressure should be reduced by 2% for every degree oC the fluid temperature is above 20°C. 

The above pressure reductions apply to maximum operating temperature of 60°C.


GENERAL INFORMATION 
The ring Integral Socket permits as angular deflection at the joint of 2 to 3 degree. 

The introduction of joint deflection is however, generally unnecessary in an inherently flexibly uPVC pipeline. Sufficient flexibility is provided by individual pipe lengths to enable gentle curves to be negotiated without imparting deflection at the joints. 

As a general guide the cold bending radius (R) of a uPVC length can be calculated as follows: 

R = 300 x External Diameter 

Where a shorter radius of curvature is required, then uPVC formed bends must be introduced.