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Type 5 mine/construction-duty, Principle of pump operation, Installation & start-up – SANDPIPER MSA2-C User Manual

Page 3: Air supply

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msa2dl5sm-rev0614

Models MSA2 MSA2-B MSA2-C Page 1

PRINCIPLE OF PUMP OPERATION

This flap swing check valve pump is powered by compressed air and is a 1:1

pressure ratio design. It alternately pressurizes the inner side of one diaphragm

chamber, while simultaneously exhausting the other inner chamber. This causes the

diaphragms, which are connected by a common rod, to move endwise. Air pressure

is applied over the entire surface of the diaphragm, while liquid is discharged from

the opposite side. The diaphragm operates under a balanced condition during the

discharge stroke, which allows the unit to be operated at discharge heads over 200

feet (61 meters) of water head.

Since the diaphragms are connected by a common rod, secured by plates to the

center of the diaphragms, one diaphragm performs the discharge stroke, while the

other is pulled to perform the suction stroke in the opposite chamber.

For maximum diaphragm life, keep the pump as close to the liquid being pumped

as possible. Positive suction head in excess of 10 feet of liquid (3.048 meters) may

require a back pressure regulating device. This will maximize diaphragm life.

Alternate pressuring and exhausting of the diaphragm chamber is performed by

means of an externally mounted, pilot operated, four-way spool type air distribution

valve. When the spool shifts to one end of the valve body, inlet air pressure is applied

to one diaphragm chamber and the other diaphragm chamber exhausts. When the

spool shifts to the opposite end of the valve body, the porting of chambers is reversed.

The air distribution valve spool is moved by an internal pilot valve which alternately

pressurizes one side of the air distribution valve spool, while exhausting the other

side. The pilot valve is shifted at each end of the diaphragm stroke by the diaphragm

plate coming in contact with the end of the pilot spool. This pushes it into position for

shifting of the air distribution valve.

The chambers are manifolded together with a suction and discharge flap-type

check valve for each chamber, maintaining flow in one direction through the pump.

INSTALLATION & START-UP

Locate the pump as close to the product being pumped as possible, keeping

suction line length and number of fittings to a minimum. Do not reduce line size.

For installations of rigid piping, short flexible sections of hose should be installed

between pump and piping. This reduces vibration and strain to the piping system.

A Warren Rupp Tranquilizer

®

surge suppressor is recommended to further reduce

pulsation in flow.

This pump was tested at the factory prior to shipment and is ready for operation.

It is completely self-priming from a dry start for suction lifts of 20 feet (6.096 meters)

or less. For suction lifts exceeding 20 feet of liquid, fill the chambers with liquid prior

to priming.

AIR SUPPLY

Air supply pressures cannot exceed 125 psi (8.61 bar). Connect the pump air inlet

to an air supply of sufficient capacity and pressure required for desired performance.

When the air line is solid piping, use a short length of flexible hose [not less than

3/4" (19mm) in diameter] between pump and piping to eliminate strain to pipes.

SERVICE AND OPERATING MANUAL

Models MSA2 MSA2-B MSA2-C

Type 5

Mine/Construction-Duty

I M2 c T5
II 2GD T5

II 2G c T5

II 3/2Gc T5

II 2Dc T100°c

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