9
Typical piping arrangement for pump mounted below system (Fig-2) and for the pump mounted above the system (Fig-3)
VACUUM CONNECTION (cont.)
TYPE OF PIPE JOINTS
A) Standard steel piping with welded joints makes the best vacuum piping system.
B) Copper piping with sweated fittings and joints can also made vacuum tight and has the advantage
of providing a neat, clean vacuum installation.
C) Standard threaded piping, however, is satisfactory and more readily installed. The piping should be
Carefully cleaned to remove any scales or chips. Blow out any loose material with compressed air prior
to installation. All male threaded joints should be carefully doped, screwed up tight and NEVER “backed-off”
to make parts align-this is apt to cause a leak.
Paint the joints while the system is under vacuum with a vacuum grade sealant until the sealant is no longer
drawn into the piping threads. U.S. Vacuum Sealant should be used..
