scope:

IGEM/TD/13 applies to the safe design, construction, inspection, testing, operation and maintenance of pressure regulating installations (PRIs) in accordance with current knowledge and operational experience. The Standard reflects the need to ensure adequate reliability and continuity of supply at pressures that are safe for the downstream system and equipment.

It now addresses Natural Gas (NG), Liquefied Petroleum Gas (LPG) and LPG/air. As a result, the scope of this Standard is shown the Table below.

In addition, significant changes have been made to this Standard including the addition of specific requirements for "small" PRIs as defined the Table below.

Other changes include:

•additional guidance on housings

•the inclusion of specific information on pipework sizing

•a justification for plug valves

•further clarification on the setting of regulators and safety devices

•new information on uprating and downrating.