I have a job coming up where I need some long hoses made up.
Not a problem. But whilst looking into what was required.
I realised that for us in the U.K. there is yet another RULE that we have to comply with.
Ammonia charging hoses should be "Tested and certificated Yearly".
Not that many I know, myself included have complied with this.
Anyway it transpires that I can get the hoses tested with either water or oil, for less than £30.00.
At that price it's easier to comply than possibly incur the wroth of some over-zealous Council type.
Usually fresh out of college with a bright shiny new "Book of rules".
The Hydraulic guys have asked me to specify what pressure I would like the hoses tested to?

I have specified 25 Bar which more than covers a condensing saturated pressure of 50c.
Which is the benchmark for all other refrigerants!

It is higher than any of the PRV'S on the Ammonia sites I work on.
Does anyone have an issue with this or can point me in the direction of where it is documented.
I cannot find it in EN 378.
Thanks Grizzly