42.80_Series4280_I&O

COMMERCIAL PUMPS
 SERIES 4280 MOTOR MOUNTED PUMP
 

ARMSTRONG SERIES 4280 PUMPS
INSTALLATION AND OPERATING INSTRUCTIONS
For Service Work Instructions refer to Armstrong Catalog File No.: 42.81
For replacement parts numbers refer to Armstrong Catalog File No.: 6042.127 & 128.
 

GENERAL

Armstrong Centrifugal Pumps, properly installed and given reasonable care and maintenance, will perform satisfactorily for a long period of time.  These instructions describe the procedures which should be followed to ensure trouble-free operation.  All work should be performed by qualified personnel. 

INSPECTION

Armstrong series 4280 motor mounted pumps are thoroughly tested and inspected before shipment to assure they meet with your order requirements.  All units must be carefully examined upon arrival for possible damage during transit.  Any evidence of mishandling should be reported immediately to the carrier and noted on the freight bill.

Important:
Do not run the pump for any length of time under very low flow conditions or with the discharge valve closed.  To do so could cause the water in the casing to reach super heated
steam conditions and will cause  premature failure and could cause serious and dramatic damage to the pump and surrounding area.

1. LOCATION

Locate the unit as close as practical  to the liquid being pumped, with a short, direct suction pipe.  Ensure adequate space is left around the unit for operation, maintenance, service and inspection of parts.
Electric motor driven pumps should not be located in damp or dusty location without special protection.
 
2. STORAGE

Pumps not immediately placed into service, or removed from service and stored, must be properly prepared to prevent rusting and bearing damage.

Bearings are lubricated by grease, and must be rotated  every two to three months to return the lubricant to the upper half of the bearing and prevent ball damage.  Do not leave shaft in same position each time.

Internal rusting can be prevented by removing the plugs at the  top and bottom of the casing and drain or air blow out all water to  prevent rust buildup or the possibility of freezing. Be sure to reinstall the plugs when the unit is made operational.  Rust proofing or packing the casing with moisture absorbing material and covering the flanges is acceptable.  When returning to service be sure to remove the drying agent from the pump.
 
3. FOUNDATION AND MOUNTING

The following text is offered as general suggestions for the preparation of a satisfactory foundation.

Foundation should be sufficiently substantial to absorb any vibration and permanently support the unit.

The most satisfactory foundations are made of reinforced concrete and should be at least 2.5 times the shipping weight of the pumping unit.  The foundation should be poured well in advance of the installation to allow proper time for drying and curing.

Locate the pump on its foundation and mark off the foundation holes, using the motor feet as the template. Drill (4) holes the required size and insert anchors. Use only the motor feet to secure the pump and motor unit. Do not use the pump casing support feet. Use a tamping tool to drive home the lead sleeve, until it is below the level of the foundation and firmly fixed into the concrete.

Protruding bolts should be avoided, since this arrangement would not allow disassembly, or back-pullout, of the unit without disturbing pipe connections.

If the unit is to be mounted on fabricated steel work or similar structure, the unit should be set over, or as near as possible to, the supporting beams or walls and to be so supported that the unit is not distorted  by any yielding or springing of the structure.

With the proper gauge, check the suction and discharge flanges of the pump for vertical position.

Slight misalignment from vertical at this point may be corrected by inserting shims under the motor feet.

When the unit is completely level, the foundation bolts should be tightened evenly and firmly.

4. PUMP PIPING - GENERAL

Never connect a pump to piping, always start piping from pump.

Use as few bends as possible and preferably long radius elbows.

Install good supports under suction and discharge piping with anchors near but independent of the pump.

Make sure piping exerts no strain on pump as this would distort the casing and cause pump misalignment.

Suction and discharge pipes may be increased at pump nozzle to suit pump capacity and particular conditions of installation. Use eccentric reducers on suction connection.

Layout the suction line with a continual rise towards the pump without high points, thus eliminating possibility of air pockets that may prevent the pump from operating.

A strainer of three or four times the area of the suction pipe, installed in the suction line, will prevent the entrance of foreign materials into the pump. 1/8” (3mm) diameter perforations in the strainer are typical.

Test suction line for air leaks before starting; this becomes essential with long suction line or static lift.

Install, at pump suction, a straight pipe of a length equivalent to 4 or 6 times its diameter; this becomes essential when handling liquids above 1200F (500C). Armstrong suction guides may be used in place of the straight pipe run and in-line strainer.

Install isolation valve in both suction and discharge lines on flooded suction application; this is used mainly to isolate the pump for inspection or repair.
Install a non-slam check valve in discharge line between pump and isolation valve to protect pump from excessive back pressure and to prevent water running back through the pump in case of  driver failure. Armstrong FIo-Trex valve may be used in place of check valve and isolation valve on pump discharge.

Caution:
Discharge valve only must be used to reduce the pump flow, not the suction valve.
Care must be taken in the suction line layout and installation, as it is usually the major source of concern in centrifugal pump applications.

1. STARTING PUMP

The pump must be fully primed on start up. Fill the pump casing with liquid and rotate the shaft by hand to remove any air trapped in the impeller. Air will not be trapped in the casing providing the self-venting center-line discharge is on top, in the vertical position.

“Bump” or energize the motor for a fraction of a second and check that the rotation corresponds with the directional arrow on the pump casing.
To reverse rotation of a three phase motor, interchange any two power leads.
Start the pump with the discharge valve closed and the suction valve open, then gradually open the discharge valve when the motor achieves full operating speed. The discharge valve may be “cracked” or open slightly at start up to help eliminate trapped air.
When stopping the pump: Close the discharge valve and de-energize the motor.
 

2. GENERAL CARE

Note:
Check rotation arrow prior to operating the unit.
Series 4280 rotation is “clockwise” when viewing  from the drive end, looking from behind the motor.