SANDPIPER GH2 - Manual

gh2dl1sm-REV0714 Model GH2 Page 1
PRINCIPLE OF OPERATION
This pump is a 2:1 pressure ratio single acting pump powered by compressed
natural gas. The 2:1 ratio is achieved by simultaneously applying gas pressure
over a single end of each of two pistons connected in series by a shaft. The two
pressurized ends are those most distant from the pumped fluid, with the force from
the gas pressure exerted in the direction of the pumped fluid. The combined force is
transferred through to the single end of the piston nearer to the pumped fluid—the
single piston end having an area equal to one-half that of the two “gas” ends—and
then through a fluid cell to a single pumping diaphragm.
On this single acting pump the suction stroke is independent of all discharge
conditions and requires less gas pressure than the discharge stroke. The suc-
tion stroke is accomplished through a natural gas regulator which pressur-
izes the piston area in the rear cylinder adjacent to the intermediate bracket, while
simultaneously exhausting the other two piston areas: one in the front cylinder, adjacent
to the intermediate bracket, and the other behind the rear cylinder piston, adjacent to
the cap end.
OPERATION
The regulator is factory preset to 30 psi. After the pump is installed and in
operation, the operator should raise or lower the setting until maximum
performance is determined by trial and error. A setting which is too high will result
in excessively rapid and noisy operation, with a loss in performance and eventually
shortened pump life.
The hose assemblies deliver natural gas to the non-wetted portions of the pump,
and care should be taken that they are neither crimped nor cut.
INSTALLATION PROCEDURES
Position the pump as close as possible to the source of the liquid to be pumped.
Avoid long or undersize suction lines and use the minimum number of fittings.
For permanent installation involving rigid piping, install short flexible sections
of hose between the pump and piping. This reduces strains and permits easier
removal of the pump for service when required. Important: The pump must be
installed on a flat, level surface. Use shims as neccessary.
NATURAL GAS SUPPLY
Do not connect the unit to a natural gas supply in excess of 125 PSI (8.61
bars). Install a shutoff valve in the gas supply line to permit removal of the unit for
servicing. When connecting a gas supply of rigid piping, mount a section of flexible
line to the pump to eliminate piping strain. In permanent installations, a gas filter is
recommended.
FREEZING OR ICING OF EXHAUST
Icing of the gas exhaust can occur under certain conditions of temperature and
humidity on compressed gas power equipment. Icing is more likely to occur at high
discharge pressures.
MAINTENANCE AFTER USE
When the pump is used for materials that tend to settle out or transform from liquid
to solid form, care must be taken after each use or during idle time to remove them
and flush the pump as required to prevent damage. In freezing temperatures the pump
must be completely drained when idle. This model must be tilted to allow the liquid from
the chambers to run out of the discharge port.
I n t h e e v e n t o f
diaphragm rupture,
pumped material may
enter the air end of
the pump, and be
discharged into the atmosphere. The air
exhaust must be piped to an appropriate
area for safe disposition.
WARNING
Before maintenance
or repair, shut off the
com-pressed air line,
bleed the pressure,
and disconnect the
air line from the pump.
The discharge line may be pressurized
and must be bled of its pressure.
WARNING
B e f o r e p u m p
operation, inspect all
gasketed fasteners
for looseness caused
by gasket creep. Re-
torque loose fasteners to prevent leakage.
Follow recommended torques stated in
this manual.
CAUTION
Read these safety
w a r n i n g s a n d
instructions in this
manual completely,
before installation and start-up of the pump.
It is the responsibility of the purchaser to
retain this manual for reference. Failure to
comply with the recommendations stated
in this manual will damage the pump, and
void factory warranty.
Take action to prevent
static sparking. Fire
or explosion can
result, especially
w h e n h a n d l i n g
flammable liquids.
T h e p u m p , p i p i n g , v a l v e s ,
containers or other miscellaneous
e q u i p m e n t m u s t b e g r o u n d e d .
WARNING
IMPORTANT
Designed to meet CSA Requirement 2:01 US for Natural Gas Operated Diaphragm Pumps
SERVICE AND OPERATING MANUAL
Model GH2
High Pressure
1:2 ratio Type 1
WARREN RUPP ® , IDEX AODD, Inc. • A Unit of IDEX Corporation • 800 N. Main St., P.O. Box 1568, Mansfield, Ohio 44901-1568 USA
Telephone (419) 524-8388 • Fax (419) 522-7867 • www.warrenrupp.com