Flowserve DS - Manual (Page 15)

DS USER INSTRUCTIONS ENGLISH 71576283 - 02/13
02
Page 15 of 36 flowserve.com
3.3 Design of major parts
3.3.1 Pump casing
The double volute type casing is centerline
supported and provided with drain and seal
connections.
Suction and discharge nozzles are cast integrally,
permitting inspection and repair of the pump without
disturbing the suction and discharge piping.
The suction and discharge nozzles are horizontally
or vertically arranged refer to elevation drawing.
All casings are provided with stop pieces in the
suction nozzle to prevent pre-rotation of the liquid as
it enters the impeller.
3.3.2 Stuffing box head
The stuffing box head is supplied with the shaft
sealing equipment consisting of a packing seal or a
mechanical seal. Furthermore it is supplied with a
bore for gland seal.
3.3.3 Shaft sealing
The sealing against leakage along the shaft sleeve
at this point where it passes through the casing is
accomplished by a packing seal or a mechanical
seal.
Packing seal
The seal is equipped with packing rings and a
lantern ring. The packing ring quality has been
chosen in accordance with the service conditions.
To prevent corrosion the pumps will be shipped
without packing rings.
Sealing liquid
Normally the liquid seal connection is piped from the
discharge side to the lantern ring. If the pumped
liquid cannot be used for sealing inpended clean
sealing liquid should be supplied with a pressure
slightly higher than the pump suction pressure.
3.3.4 Wearing rings
Pump casing and stuffing box head are furnished
with shrunk in wearing rings.
3.3.5 Shaft and shaft sleeve
The pump shaft is provided with a shaft sleeve
axially, secured by the impeller and a shaft shoulder.
3.3.6 The impeller
The single suction impeller is keyed to the shaft.
Axial movement is prevented by a cap with lock
screw and the shaft sleeve.
3.3.7 The bearing bracket
The bearings are mounted in the bearing bracket.
For grease: lubrication grease nipples are provided.
3.3.7.1 The bearing
The thrust bearing
The thrust bearing consists of two angular contact
ball bearings mounted "face to face".
The inner races are secured axially by the shaft
shoulder and the lock nut. The outer races are
contained between the circlips and the outer cover.
The line bearing
The line bearing is a cylinder roller bearing with its
inner race mounted against a shaft shoulder. The
outer race is contained between the circlips and the
inner cover.
3.3.8 The couplings
For details about the fitted coupling refer to
manufacturer's instructions.
3.3.9 The driver
For details about the installed driver refer to
manufacturer's instructions.
3.4 Guide to store “vulcanized rubber”
(Max. time of storage 2 years)
3.4.1 Introduction
Most vulcanized rubbers change in physical
properties during storage and may become
unserviceable because of excessive hardening,
softening, cracking, crazing or other surface
degradation caused by the action of oxygen, ozone,
light, heat and humidity or improper storage.
The deleterious effects of these factors may,
however, be minimized by careful choice of storage
condition.
3.4.1.1 Storage room
The storage room should be cool, dry, dust free and
moderately aired.