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[rajputg]

I have a question for providing overpressure protection for custody metering skid as per ASME B31.8 code, para 845.2.4

 

Does it mandatory to provide slam shut off valve along with active monitor regulator configuration and redundant safety relief valves? Existing skid has been designed and built with active monitor regulator configuration and redundant safety relief valves. Operations is adamant and asks us to provide slam shut off valve. Please advise me if existing arrangement of two regulators in series and safety relief valve is adequate or not for over pressure protection of piping.

 

Highpressure distribution system.

Suitable types of protective devices to prevent overpressuring

of high-pressure distribution systems

include

(1) relief valves as prescribed in paras. 845.2.1(a)

and (

(2) weight-loaded relief valves

(3) a monitoring regulator installed in series with

the primary pressure regulator

(4) a series regulator installed upstream from the

primary regulator and set to limit the pressure on the

inlet of the primary regulator continuously to the maximum

allowable operating pressure of the distribution

system or less

(5) an automatic shutoff device installed in series

with the primary pressure regulator and set to shut off

when the pressure on the distribution system reaches

the maximum allowable operating pressure or less. This

device must remain closed until manually reset. It

should not be used where it might cause an interruption

in service to a large number of customers.

(6) spring-loaded, diaphragm-type relief valves