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BigInch, Could you please tell me what is the test pressure & suggested operating pressure for the 3mm thickness trunk pipeline according to B31.4?

Thanx vpl for the tips. Old pipes of < 3mm thickness were replaced with pipes of 7.8mm thickness. Please note old pipe sections of thickness between 3mm and 7.8mm were not attended.

ORIGINAL PIPE WALL THICKNESS IS 7.8MM. PIPE SECTIONS WALL THICKNESS 3 AND LESS THAN 3MM WERE REPLACED

A 50KM LENGTH OF 10" DIA(WALL THICKNESS 7.8MM,C.S., ASTM A53 GR.B) OIL EXPORT PIPELINE IS REPAIRED WITH REPLACEMENTS OF SECTION OF PIPES WHICH ARE LESS THAN 3MM THICKNESS. OPERATING PRESSURE OF THE LINE IS 200 PSI. HYDROSTATIC TEST IS PLANNED.IS IT ADVISABLE TO PRESSURISE UPTO 600 PSI? WHAT IS...

Can we connect single phase 220V appliances & equipments to two phases of 3 phase 220V(line)supply(127V phase voltage)? any precaution such as dedicated earth to be taken up?