Flowserve SVCN 7, Установка, эксплуатация и обслуживание

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SVCN 7 INSTALLATION, OPERATION, & MAINTENANCE
back. A lock nut and washer are furnished with the thrust bearing. The radial bearing takes radial
loads. The thrust bearing takes both radial and thrust loads.
1.3.4 BEARING LUBRICATION
Ring oil with automatic oiler is the common method for lubricating bearings in the SVCN 7 pump.
Other methods are purge mist or pure mist. To determine the system (or method) that is applicable to
your pump, see the pump and motor OUTLINE drawing.
1.3.5 PIPING
Factory-installed piping can consist of cooling water piping or steam piping; flush piping for the
mechanical seal or packing; the specific piping configuration is depends on what the purchaser
ordered. If piping is installed on your pump, the PIPING drawings define the configuration.
1.3.6 MECHANICAL SEALS AND PACKING
The SVCN 7 pump is equipped with either packing and lantern ring, a single mechanical seal, double
mechanical seal, tandem mechanical seal, or a single mechanical seal with packing rings. As referred
to in this manual, the double mechanical seal consists of two single mechanical seals with their rotary
washers (or rings) back-to-back and the tandem mechanical seal consists of two single mechanical
seals with rotary rings and stationary seats in series; that is, ring-seat-ring-seat sequence. Hooked
shaft sleeves are used with both packing and the mechanical seal and can only be removed by
disassembling the pump. Cartridge seals may also used.
1.3.7 HEAD
The head on the SVCN 7 pump has a packing gland or a seal plate and it is installed from outside the
head. Only packing can be replaced without disassembling the pump. The head with packing gland
incorporates a passageway and tapped boss for piping a lubricant to the lantern ring. Where the head
accommodates a mechanical seal, no passageways or piping is installed unless specified by the
purchaser. To determine what is supplied with your pump see the pump ASSEMBLY and
MECHANICAL SEAL ASSEMBLY drawings.
1.3.8 SPECIAL TOOLS
Ordinarily, special tools are not required for maintenance of the SVCN 7 pump. Should a special tool
be required, it is described by a Flowserve engineering drawing. Its use would be covered in
supplementary instructions for performing the particular task for which it was designed.
1.4 OPERATING PRINCIPLES
1.4.1 ENERGY TRANSFER
The impeller is the means used to generate the head. As the liquid enters the eye of the impeller via
the suction nozzle, the rotation of the impeller gives the liquid energy, causing a flow from the eye of
the impeller to its outer edge. The greater part of the energy in the liquid as it leaves the impeller
appears as velocity head, which is converted into pressure head as it moves through the voluted
passage.
1.4.2 SHAFT SEALS
For the SVCN 7, the shaft seal is either a mechanical seal or packing rings.
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