BS ISO 4437-1:2014

1   Scope This part of ISO 4437 specifies the general properties of polyethylene (PE) compounds for the manufacture of pipes and fittings intended to be used for the supply of gaseous fuels . It also specifies the test parameters for the test methods referred to in this International Standard. In conjunction with ISO 4437-2, ISO 4437-3, ISO 4437-4, and ISO 4437-5, it is applicable to PE pipes, fittings and valves, their joints, and joints with components of PE and other materials intended to be used under the following conditions:

       a)  the  maximum operating pressure  ( MOP ), is based on the  design stress  determined from the  compound  minimum required strength  ( MRS ) divided by the  C  factor, and taking into account rapid crack propagation (RCP) requirements; 
   
   
     
       b)  a temperature of 20 °C as  reference temperature  for the design basis. 
   
 


 
   NOTE 1  For other operating temperatures, guidance is given in [ISO 4437-5:2014](/catalog/ISO%204437-5%3A2014). 


 
   NOTE 2  It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particula...