Flowserve SVCN 7, Установка, эксплуатация и обслуживание

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SVCN 7 INSTALLATION, OPERATION, & MAINTENANCE
2. INSTALLATION
2.1 FOUNDATION AND PIPING
2.1.1 LOCATION
The unit should be installed close to the source of the liquid to be pumped. The location must also
allow adequate space for operation as well as for maintenance operations involving dismantling and
inspection of parts. Head room is an important consideration because an overhead lift of some type is
required for assembly and disassembly of the pump.
2.1.2 PIPING
These units are furnished for a particular service condition. Changes in the hydraulic system may
affect performance adversely. This is especially true if the changes reduce the pressure at the suction
or if the liquid temperature is increased. When installing piping, Flowserve recommends:
1. that as the line is erected, a swab fitting the entire cross section of the pipe be pulled through
each section to assure the removal of scale or other foreign material;
2. that suction and discharge piping should be of ample size, be installed in direct runs, and have
a minimum of bends;
3. that a suction pipe equal to or one size larger than the pump suction nozzle is used;
4. that there is a straight length of pipe (approx. 8 to 10 times the pipe diameter) just upstream
of suction nozzle (No double turns);
5. that the piping slopes in the correct direction;
6. that no high spots or pockets are present in which air or vapor can collect;
7. that piping supports, valves, and fittings are properly located, and all eccentric reducers or
increasers are properly installed;
8. that the piping is installed to avoid excessive loads on the pump nozzles from poor alignment
of piping or improper location of piping anchors;
9. that a check valve and a gate valve be installed in the discharge pipe of the pump. When the
pump is stopped, the check valve will protect the pump against excessive pressure and will
prevent the pump from running backward. The check valve should be installed between the
gate valve and the pump nozzle in order to permit its inspection.
10. that a spool piece is installed in the suction line so that the suction strainer may be installed
and removed with a pressure gauge between the strainer and pump.
2.1.2.1 Suction Strainer
In a new installation, great care should be taken to prevent dirt, scale, welding beads and other items
from entering the pump, as it is particularly important to protect the numerous close running fits from
abrasive matter present in new piping
The suction system should be thoroughly flushed before installing the suction strainer and connecting
the suction piping to the pump.
The suction strainer should be installed between 5 to 20 pipe diameters upstream from the pump
suction flange.
- 2-1 - DO2604-13