The engine should be run slowly and carefully for a while, to give a
chance to find out if anything is going to heat, before putting on any
load.
Now if your engine is all right, you can run the pressure up to the
point of blowing off, which is from one hundred to one hundred and ten
pounds. Most new pop valves, or safety valves, are set at this
pressure. I would advise you to fire to this point, to see that your
safety is all right. It is not uncommon for a new pop to stick, and as
the steam runs up it is well to try it, by pulling the relief lever. If,
on letting it go, it stops the escaping, steam at once, it is all right.
If, however, the steam continues to escape, the valve sticks in the
chamber. Usually a slight tap with a wrench or a hammer will stop it at
once, but never get excited over escaping steam, and perhaps here is as
good a place as any to say to you, don't get excited over anything. As
long as you have plenty of water, and know you have, there is no danger.
The young engineer will most likely wonder why we have not said
something about the danger of explosions.
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