[modeleng] Regulator and dome screws - offical guidelines on materials?

Hi there All,

In these times of increased rules and regs governing our boilers, are 
there any guidelines on what material our regulator and done fixing screws 
should be made of.

Dismantling the Rob Roy I'm currently tinkering with, the badly coroded 
STEEL (ouch) regulator screws are in need of replacement (infact three of 
them didn't have any thread left on them).

Looking at Martin Evans Rob Roy notes, he says not to use steel or brass, 
whereas for Mona LBSC suggests using brass. Many of the more modern 
articles I have infront of me don't say what material to use for the 
screws!!!

We are also advised in the literature of the tendancy for stainless and 
bronze to 'disagree' with each other.

So does this leave something like gunmetal or monel? I have to admit that 
the thought of some of the nastier bits of gunmetal supplied by the trade 
being turned into screws carrying load doesn't make me feel that happy.

Anyway, so back to my point - is there any official guidelines on 
materials for these things?

Also we are told in the literature that it is best not to use brass for 
boiler fittings, yet all the off the shelf fittings that are for sale seem 
to be made from brass - am I missing something here? Are there again 
official guidelines for what materials should be used here?

Yours,


Rich.

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