Hi,
Whilst attending a site the other day regarding a seperate issue, i had a visual inspection in the plant room. The plant comprises of 4 scerw compressors on Nh3 with thermosyphon oil coolers.Each oil cooler is fed liquid from a liquid header fed from a small liquid receiver. The oil cooler liquid receiver has a outlet valve, the oil coolers have inlet stop valves and outlet stop valves which are located at the inlet of the evap condenser.I noticed a small Nh3 leak on the flange of a safety relief valve which i was able to secure, but what cocerned me was the location of the valve. It is installed in to either side of the inlet stop valve on the oil cooler. This would mean isolating the small receiver valve, therefore liquid feed to all oil coolers, should the safety valve require to be removed. I think the valve should be on installed between the outlet stop valve as this would make it serviceable. Is there any reason that it has to be on the inlet side?: