If the waterworks will not afford you sufficient pressure, you
can bring it up to the required pressure, by attaching a hydraulic pump
or a good force pump.
In testing for the purpose of ascertaining if you have a good job on
your flues, it is not necessary to put on any greater cold water
pressure than you are in the habit of carrying. For instance, if your
safety valve is set at one hundred and ten pounds, this pressure of cold
water will be sufficient to test the flues.
Now, suppose you are out in the field and want to test your flues. Of
course you have no hydrant to attach to, and you happen not to have a
force pump, it would seem you were in bad shape to test your boiler with
cold water. Well, you can do it by proceeding in this way: When you
have expanded and beaded all the flues that were leaking, you will then
close the throttle tight, take off the safety valve (as this is
generally attached at the highest point) and fill the boiler full, as it
is absolutely necessary that all the space in the boiler should be
filled with cold water. Then screw the safety valve back in its place.
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