Hello all,

first of all i wasnt sure what section to post this in but being that its on a commercial site of mine i thought id post it here.

Basically i am after some information or regulation if there is any for this specific subject.

A site i look after hasnt had the PRV's replaced since the kit was installed (2015) most of my sites usually have them replaced every 3-5 years but this site doesnt seem to like the idea of replacing them, is there any regulation that says they need replacing every 3-5years or is this just what the manufacturer's specify?

Also the same site hasnt had any of the liquid drier cores replaced since 2016, again i was under the understanding that best practice was to replace them every 2-3 years unless the system has been opened to work on it or had a leak then you replace once the system is repaired and back operational.

Any advice, information or general input would be appreciated.