Armstrong Design Envelope 4372 - Page 7

installation &
operating instructions
Design Envelope 4322 & 4372
Tango Pumping Unit
7
f with stanchion plates
Where required, additional floor support may be used as shown
in fig. 1.2.6. Note that the pump should not be rigidly attached
to the column. Leave a small gap between pump and column or
install a ‘wae’ isolation pad under the pump. It is critical that
piping be installed in such a manner that the pump does not
become a pipe support.
fig. 1.2.6
Isolation Pads
Stanchion Plates
g seismic region installation
fig. 1.2.7 illustrates installations with stanchion plates for seis-
mically active regions. Seismically rated isolation pads or snub-
bers with bolts isolated from the stanchion plates are installed
to restrain the pump during a seismic event. Pipe hangers carry
the weight of the equipment as seismic components are de-
signed only to restrain the equipment during a seismic event.
fig. 1.2.7
Seismically rated snubbers or pads and
conrete foundation
Stanchion plates
h mounting in grooved pipe systems
Many Vertical In-Line pumps are piped successfully into grooved
piping systems. In-line pumps are supported well by grooved
piping, however, flange adapter locking devices or a welded
flange at the pump should be used to help prevent pipe mount-
ed pumps from rotating in the piping. Armstrong oers grooved
suction guides with cast-in outlet flanges and Flo-Trex valves
with Armgrip™ fittings to reduce this possibility.
fig. 1.2.8
Dr
ain connection
Suction guide
System inlet
Recommended field
pressure gauge
piping arrangement
Flo-Trex valve
Pet cock
(typ.)
Pipe hanger
(typ.) See
specification for
size and type
System outlet
Split coupler
Flush
line
Gruvlok 7000 flex
coupling (typ.)
7700 butterfly
valve
Hangers support the weight of the
filled piping, pumps and fittings
i mounted on rigid base without flexible
connectors
Connecting the pump to a permanent rigid base (fig. 1.2.9)
is not recommended unless it is isolated from the piping by
flexible connectors and the base is isolated from the building
structure on an inertia base. (fig. 1.2.9 is generally acceptable
when using plastic piping).
fig. 1.2.9