Sterlco SEU Series Economical Water TCU - Manual (Page 18)

WTR1-600 Chapter 3: Installation 18 of 42
3-4 Piping Considerations for Permanent Installations
An optional (or customer-installed) strainer on the COOLING WATER IN inlet is recommended
The unit must have at least 16 psig (110.32 kPa/1.1 bars) water supply pressure to prevent pump
cavitation that can be caused by the water “flashing” to steam. To avoid damage to the pump or
other components, make sure that maximum supply pressure does not exceed 75 psig (517.1
kPa/5.17 bars).
Keep restrictions to a minimum by using proper inlet pipe sizing. If the water supply piping is
larger than ¾”, reduce the size at the unit. The table below contains the pipe sizes that are used in
the unit.
Pipe sizes for ¾ hp to 7.5 hp (0.56 kW to 5.59 kW) units
Location Size in inches NPT
To Process 1½”
From Process 1½”
Cooling Water In ¾”
Cooling Water Out - depends on solenoid used -
Common black pipe is recommended for permanent installations. Economical Series water circuit
piping is primarily ferrous (iron) and reacts electro-chemically with non-ferrous metallic
materials such as copper. Some water contains dissolved minerals that greatly accelerate the
reaction between dissimilar metals.
Ferrous piping is recommended to minimize galvanic action. If piping must be copper, use
dielectric unions at the unit.
3-5 Piping Considerations for High Mobility Installations
Mobile Economical Series systems must use high quality hose rated for at least 150 psig and
250ºF (1,034.25 kPa/10.34 bars and 121ºC). Special 300°F (149ºC) high temperature Economical
Series systems must use hosing rated at 150 psig and 300°F (1,034.25 kPa/10.34 bars and 149ºC)
or greater.
Quick disconnects may be used for mobility, although they cause a drop in pressure. If used,
they must be sized carefully to minimize pressure drop. Don’t use quick disconnects with check
valves unless absolutely necessary.
Non-relieving quick connect fittings or check valves on the water supply must
have a pressure relief piped to the drain.
Failure to do so could result in a dangerous over-pressure condition!