Each arm of the manifold shall have a control valve. To each arm of the cylinder manifold, cylinders shall be connected through a pigtail. A check valve and an isolation valve shall be provided with each cylinder pigtail connection to protect the system from back flow of LPG in event of any flexible pigtail rupture.

The distance between two pigtail connections on manifold shall be minimum 300 mm.

All such manifolds shall be designed to a pressure equivalent to the maximum developed cylinder pressure (assessed at 65°C) of LPG that is 16.87 kgf/cm2. The test pressure should be 1.5 times the maximum pressure (assessed at 65°C) that is 25 kgf/cm2 for a period of 2 minutes.

Note: The standard recommends conducting a pressure test for a duration of 2 minute. However, we believe this may be a typographical error. Given the critical safety implications of pressure testing, a duration of 2 hours would be more appropriate and aligns with standard industry practices.