Hi All,
Talking about regulators this week in G2 classes. I thought of a question just now but the weekend is here and I want to try and clear this up before Monday possible test.
Is SUPPLY pressure the same as WORKING pressure?
What I mean is, for a natural gas service to a house for example, the service regulator is taking the service pressure (or "street pressure") down to supply pressure which is further reduced to manifold pressure by the appliance regulator. Now this "supply pressure", when talking about testing for system pressure drop, I believe is the same as calling it "working pressure". In G3 we learned (and it all makes sense being analogous to voltage drop and current flow) that pressure drop is when you subtract working pressure at the appliance from working pressure at the meter. And that pressure is in the same part of the system as the so-called supply pressure.
LOL Ok I think I just answered my own question (correct me if I'm wrong!) : Working pressure is supply pressure when the appliances are firing.
This is how I'd look at it.
Supply pressure is the pressure up to the appliance gas control like 7 - 11'' wc and working pressure is what it the appliance requires to operate, like operational with a minimum of 7'' wc.
I consider the working pressure to be the pressure when gas is flowing through a regulator/ appliance manifold. Where supply pressure is just whatever pressure is there whether a regulator is working or closed off. Supply pressure will always be ahead of an appliance manifold.
Thanks all, I see clearer now.