10 SERIES | OM−05463 |
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forced type to prevent collapse under suction. Us- ing piping couplings in suction lines is not recom- mended.
Line Configuration
Keep suction and discharge lines as straight as possible to minimize friction losses. Make mini- mum use of elbows and fittings, which substan- tially increase friction loss. If elbows are necessary, use the
Connections to Pump
Before tightening a connecting flange, align it ex- actly with the pump port. Never pull a pipe line into place by tightening the flange bolts and/or cou- plings.
Lines near the pump must be independently sup- ported to avoid strain on the pump which could cause excessive vibration, decreased bearing life, and increased shaft and seal wear. If
Fittings
Suction lines should be the same size as the pump inlet. If reducers are used in suction lines, they should be the eccentric type, and should be in- stalled with the flat part of the reducers uppermost to avoid creating air pockets. Valves are not nor- mally used in suction lines, but if a valve is used, install it with the stem horizontal to avoid air pock- ets.
Strainers
If a strainer is furnished with the pump, be certain to use it; any spherical solids which pass through a strainer furnished with the pump will also pass through the pump itself.
If a strainer is not furnished with the pump, but is installed by the pump user, make certain that the total area of the openings in the strainer is at least three or four times the cross section of the suction line, and that the openings will not permit passage of solids larger than the solids handling capability of the pump.
This pump is designed to handle up to 1
Sealing
Gauges | Since even a slight leak will affect priming, head, | |
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| and capacity, especially when operating with a | |
Most pumps are drilled and tapped for installing | high suction lift, all connections in the suction line | |
discharge pressure and vacuum suction gauges. If | should be sealed with pipe dope to ensure an air- | |
these gauges are desired for pumps that are not | tight seal. Follow the sealant manufacturer’s rec- | |
tapped, drill and tap the suction and discharge | ommendations when selecting and applying the | |
lines not less than 18 inches (457 mm) from the | pipe dope. The pipe dope should be compatible | |
suction and discharge ports and install the lines. | with the liquid being pumped. | |
Installation closer to the pump may result in erratic |
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readings. |
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| Suction Lines In Sumps | |
SUCTION LINES | If a single suction line is installed in a sump, it | |
| should be positioned away from the wall of the | |
To avoid air pockets which could affect pump prim- | sump at a distance equal to | |
ter of the suction line. | ||
ing, the suction line must be as short and direct as | ||
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possible. When operation involves a suction lift, the | If there is a liquid flow from an open pipe into the | |
line must always slope upward to the pump from | sump, the flow should be kept away from the suc- | |
the source of the liquid being pumped; if the line | tion inlet because the inflow will carry air down into | |
slopes down to the pump at any point along the | the sump, and air entering the suction line will re- | |
suction run, air pockets will be created. | duce pump efficiency. | |
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INSTALLATION | PAGE B − 3 |
