Trillium 8-WSP, Installation, Operation And Maintenance Instructions, Page: 43 / 68

WSP™
DATA SHEET WSP™ SELF-PRIMER PUMPS WSP-D300_8
Rev. 3 01/09/20
© 2019 The Factory
43
When selecting and applying pipe dope, follow the sealing
manufacturer’s recommendations. Be sure the sealant is appropriate
for the liquid being pumped.
4. Suction Lines in Sumps
When installing a single suction line in a sump, keep it away from the
wall of the sump and at a length equal to 1½ times the diameter of the
suction line.
Any liquid flowing into the sump from an unclosed pipe
must be
at a
distance from the suction inlet to avoid air intake into the sump. Air in
the suction line causes a reduction in pump performance.
When necessary for inflow from an open pipe to be close to the
suction inlet, a baffle must be installed between the inflow and suction
inlet. Be sure the baffle is at a length that is 1½ times the suction
pipe’s diameter. This permits trapped air to be vented prior to any
liquid being pulled into the suction inlet.
If possible, avoid installing two suction lines to a single sump. This
causes the paths of the flow to intersect and impacts performance of
the pumps. Eliminate this possibility by spacing the suction inlets
apart from each other. Keep the length at least 3 times the suction
pipe’s diameter.
5. Suction Line Positioning
Depth of the submerged suction line is extremely important to ensure
ongoing pump performance. Refer to Figure 12 and Figure 13
showing the suggested minimum submergence vs. velocity chart.
NOTE:
Reduce pipe submergence requirements at the end of the suction line
by installing a standard pipe increaser fitting. Increased size of the
opening will slow velocity at the inlet. Calculate adequate
submergence using the formula below. The formula is based on the
enlarged opening size/ area of the diameter.