INSTALLATION (continued) | PAGE 5 |
7.GROUTING
When the alignment is correct, the unit should be grouted using
8.PIPING
CAUTION: ALL PIPING CONNECTIONS MUST BE MADE WITH THE PIPING IN A FREE SUPPORTED STATE, AND WITHOUT THE NEED TO APPLY VERTICAL OR SIDE PRESSURE TO OBTAIN ALIGNMENT OF THE PIPING WITH THE PUMP FLANGE.
CAUTION: AFTER ALL THE PIPING IS CONNECTED, THE PUMP AND DRIVER ALIGNMENT MUST BE RECHECKED.
All piping should be independently supported near the pump so that pipe strain will not be transmitted to the pump casing. The suction and discharge piping should be one or two sizes larger than the pump flange sizes, especially where the piping is of considerable length. Any flexible joints installed in the piping must be equipped with tension rods to absorb piping axial thrust. Care must be exercised in arranging elbows so as not to generate vortexing in the pump inlet.
The suction pipe must be air tight and sloped upward to the pump flange to avoid air pockets that will impair satisfactory pump operation. The discharge pipe should be as direct as possible with a minimum of valves to reduce pipe friction losses.
A check valve and closing valve should be installed in the pump discharge line and a closing valve in the suction line. The check valve, between the pump and the closing valve, protects the pump from water hammer and prevents reverse rotation in the event of power failure. The closing valves are used in priming, starting and when the pump is shut down. The pump must never be throttled by the use of a valve in the suction line.
9.AUXILIARY PIPING CONNECTIONS AND GAUGES
In addition to the primary piping connections, your pump may require mechanical seal and seal water filter connections, connections to the lantern ring (see the “Packing Box” and “Mechanical Seal” sections of this manual), stuffing box drain, discharge and suction flange gauges, casing relief valve drain or baseplate drain connections. All these lines and gauges should now be installed.
10.FINAL COUPLING ALIGNMENT
The alignment of the coupling must be carefully checked during installation and as the last step before starting the pump. If realignment is required, the piping should be disconnected first. After aligning, reconnect the piping in accordance with the previous instructions and again recheck the alignment.
A flexible coupling must not be used to compensate for misalignment resulting from poor installation or temperature changes.
Aurora Pumps are supplied with several different types of commercial couplings. Refer to the coupling manufacturer’s installation instructions for maximum allowable misalignment.
NOTE:FOR MAXIMUM LIFE, KEEP MISALIGNMENT VALUES AS NEAR TO ZERO AS POSSIBLE.
A.Check parallel misalignment by placing a straightedge across the two coupling flanges and measuring the maximum offset at various points around the periphery of the coupling. DO NOT ROTATE THE COUPLING. If the maximum offset exceeds manufacturer’s recommendations, realign the coupling.