21Installation, Operations & Maintenance Manual
NOTE:
Synthetic oils are available that span the entire
temperature range. Contact Milton Roy for
further information.
Recommended Oil
Any equivalent oil is acceptable.
Nominal Oil Capacity
2.10 PIPING
General
Refer to Figure 15 for a diagram of a typical Piping
and Instrumentation Diagram.
Support all piping connections to the pump so
that no stress is placed on pump fittings. In
no case should the piping be sprung to make
the connections to the pump. The suction and
discharge cartridge pipe connections can be
positioned within an arc of approximately 150° to
facilitate piping to pump.
Flush and blow out all pipelines before connecting
the pump. This eliminates any foreign matter
that might seriously damage the internal working
parts of the liquid end. Install a 20 mesh Y-type
strainer that is sized to remove foreign particles
with minimum pressure drop in the suction line of
the pump. It is also recommended to perform a
leak test of the system with a neutral liquid before
pressured start-up of the nal installation.
Install shut-off valves, with unions on the pump side
of the valves, in the suction and discharge lines to
facilitate servicing.
Use extreme care in piping to plastic liquid end
pumps with rigid pipe such as PVC. If excessive
stresses or vibration is unavoidable, flexible
connections are recommended.
NOTE:
Many pipe joint compounds are not suitable
for use with plastic pipe and, if used, will cause
stress cracking at the connection. Use only
compounds commended for use with plastic
materials.
Suction Piping
The suction piping must be absolutely tight and leak
free. For mRoy pumps on water-like solutions we
recommend that the suction pipe be ¾” minimum
diameter and a maximum of 6 feet (2 meters) long.
The intent is that the piping must be designed to
provide an adequate net positive suction head
(NPSH). Obtain our NPSH Calculation software at
the Milton Roy website (www.miltonroy.com). If
assistance in determining NPSH is needed, contact
the Milton Roy Aftermarket Service department
through the website (www.miltonroy.com)
A ooded suction is recommended for optimum
service life and maintenance-free operation.
However, the mRoy pump can operate with less
than ooded suction if necessary, in accordance
with the following schedule shown in the chart
below.
Model
Number
Min. NPSH Max. Li
(PSI)
(Ft. (meter) H2O)
(Bar)
mRoy A RA 10 10 (3)
mRoy H/T RH or RT 10 10 (3)
mRoy P RP 10 10 (3)
SECTION 2 - INSTALLATION
Oil Type
Ambient
Temp. 15-50 °F
(-9-10 °C)
Ambient
Temp. Above
50°F(10°C)
AGMA Spec No. 2 EP No. 5 EP
Zurn Oil Co No. EP 35 No. EP 95
ISO Grade 68 220
Oil Type
Ambient
Temp. 15-50 °F (-9-10
°C)
Ambient
Temp. Above
50°F(10°C)
AGMA Spec No. 2 EP No. 5 EP
Zurn Oil Co
No. EP 35 No. EP 95
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