INSTALLATION
PRE-INSTALLATION CLEANING
Foreign matter entering the pump WILL cause extensive
damage. The supply tank and intake piping MUST be cleaned
and flushed prior to pump installation and operation.
LOCATION AND PIPING
An improperly designed piping system or improper unit
installation WILL significantly reduce pump performance and
life. Blackmer recommends the following piping system layout
and unit installation.
1. To minimize intake losses, locate the pump as close as
possible to the source of supply.
2. Intake piping and fittings MUST be at least as large in
diameter as the pump intake connection.
3. Minimize the number of intake line fittings (valves, elbows,
etc.) and piping turns or bends. The nearest fitting on the
intake line must be at least 6" from the pump to permit
access to the pump relief valve . (See Figure 3)
4. An intake strainer must be installed 5 - 10 pipe diameters
from the pump intake. The strainer should have a net open
area of at least four times the area of the intake pipe.
Strainers must be cleaned regularly to avoid pump
starvation and cavitation.
5. Intake and discharge piping MUST be free of all leaks.
6. To facilitate piping expansion and contraction, expansion
joints should be placed 3 feet (0.9m) from the pump intake
and discharge.
7. ALL piping and fittings MUST be properly supported to
prevent any piping loads from being placed on the pump.
8. Install pressure gauges in the NPT ports provided in the
pump casing to check pump at start up.
9. The use of a vapor return line will increase delivery by
preventing back pressure from building up at the receiving
tank and reducing pressure in the supply tank.
10. Whenever possible, keep liquefied gas systems full of
liquid, even when idle. This will keep the O-rings from
changing shape, shrinking or super cooling. Evaporation
of liquefied gas leaves an abrasive powder on the surface
which can cause wear to the pump, meter, and seals.
PUMP MOUNTING
Permanently mount the unit by securing the base plate with
adequately sized anchor bolts to a level concrete floor
following recommended
industry standards (See Figure
1). A solid foundation will
reduce system noise and
vibration, and will improve
pump performance. Refer to
ANSI/HI standards or a
suitable pump handbook for
information on typical pump
mounting and foundations.
Check coupling alignment after
pump and base assembly is
secured to the foundation.
COUPLING ALIGNMENT
The pump must be directly coupled to a gear and/or driver with
a flexible coupling.
Both angular and parallel coupling alignment MUST be
maintained between the pump, gear, motor, etc. in accordance
with manufacturer’s instructions. See Figure 2.
1. To check for parallel alignment, the use of a dial indicator is
preferred. If a dial indicator is not available use a straight
edge. Turn both shafts by hand, checking the reading
through one complete revolution. Maximum offset should
be less than .005" (125 microns).
2. To check for angular alignment, insert a feeler gauge
between the coupling halves. Check the spacing in 90
degree increments around the coupling (four check points).
Maximum variation should not exceed .005" (125 microns).
BOLT
BASE
STANDARD
PIPE
WASHER
Figure 1
BOLT
BASE
STANDARD
PIPE
WASHER
INTERNAL PUMP RELIEF VALVE AND
EXTERNAL BYPASS VALVE
NOTICE:
THE PUMP INTERNAL RELIEF VALVE IS DESIGNED TO
PROTECT THE PUMP FROM EXCESSIVE PRESSURE
AND MUST NOT BE USED AS A SYSTEM PRESSURE
CONTROL VALVE.
For ALL liquefied gas applications, install an external bypass
valve, and any necessary piping, back to the storage tank.
DO NOT pipe the bypass valve back to the intake line. The
setting on the external bypass valve should be at least 25 psi
(1.7 bar) lower than the internal pump relief valve setting.
Refer to “Relief Valve Setting & Adjustment” section. The
valve and piping must be of adequate size to accommodate
the full flow from the pump when the discharge line is closed.
A Blackmer Model BV bypass valve can be mounted as shown
in Figure 3 for bulk plant installation. Refer to Blackmer
Bypass Valve Installation and Maintenance Instructions for
bypass valve settings and adjustments.
Figure 2 - Alignment Check
3
Figure 3- Bypass Valve Mounting
Do not start
pump unless
this valve is
open.
Bypass Valve
Storage Tank
Gate or Ball
Valves
Strainer
Discharge
Unions
Alternate
Discharge
to Storage
Tank
Intake Connection
for unloading tank
cars or tank trucks
