The DM, TDM and TDMG high-pressure centrifugal
pump is mainly used in oil refineries, decoking and
dephosphorization devices in steel plants, as well as water
injection in oil fields and other similar applications. The
conveyance mediums temperature can't exceed 80℃, while grain size
of the impurities such as coke breeze and powder phosphor, and
contents shall be less than 3000ppm. Pump design and manufacturing
specifications are referred to API610 Standard (version 8).
The DM pump is a single-cased sectional
multistage centrifugal pump, with suction part, middle part and
exhaust part are connected by through bar. The static junction
planes between all parts are connected jointly by metal surface and
O-ring seal. Pump impellers are heatly assembled to pump shaft in
orders to improve rotator rigidity.
TDM and TDMG pumps are two-cased horizontal and multistage
centrifugal pumps, mainly consisting of cylinders, pump covers and
sectional pump cores. The pump cores are assembled in cylinders,
with its exhaust port assembled by bolts to tightly connect pump
cover to cylinder and sealed by winding gasket. Pump cores consist
of suction body, middle part, guide blade and rotator. Impellers
are heatly assembled to pump shaft, with axial position limited by
snap rings.
DM and TDM pumps have the suction port and exhaust port
vertically upright. The DM pump has foot support, while TDM and
TDMG pumps are centre support.
Rotator radial forces are mainly balanced by double balance
mechanism, while the left axial forces are balanced by thrust
bearings.
Bearing: pump rotator is radically supported
by qua-oil-wedged sliding bearings; its radial position is limited
by the thrust bearings at the back of radial bearings on pump
exhaust end, which may also used to stand the left axial forces.
Radial bearings and thrust bearings shall be forcedly lubricated
respectively.
Shaft seal: The DM pump uses fillers for
shaft seal.
TDM and TDMG pumps can use mechanical seal upon customer's
requirements.
Transmission: DM/TDM pumps are driven by
electrical motor via diaphragm couplings. Pump, gearbox and
electrical motor of the TGMG pump jointly use one heavy coupling
base with good rigidity, and the pump is driven by electrical motor
via diaphragm couplings. Pump rotates in clockwise direction from
driven end point of view.
