Relief valve discharge piping termination

[kbs]

Does anybody know where any code speaks to the issue of discharging relief valves on an ammonia refrigerant system into the suction side of the compressor? We currently have 3 valves piped in this manner, however I am having a difficult time sourcing replacements for the existing valves, because of this arrangement

 

[imok2]

Pressure relief valves shall discharge into the low pressure side of the
refrigerating system or to the outside of the building. A pressure relief valve
discharging into the low-pressure side must be of the type that is not affected by
back pressure. If terminating outdoors shall discharge at a location 15 feet above
adjoining ground level not less than 20 feet from any window, ventilating opening
or exit in a building.

 

[kbs]

imok2,
Thanks for the info. Now, at the risk of appearing as a salesman, do you know of any valves of this type approved for use in Canada? Also, what quality makes a valve "of the type not affected by back pressure"?

 

[imok2]

kbs, I am not a practioner of ammonia systems but this web site should give you more of the information you need.

http://www.mpri.lsu.edu/workshop/Pressure Relief Devices Scott Ostrowski.ppt

 

[kbs]

imok2,

Very helpful, not only here but wih our apprentices as well. Many thanks.