DM TDM High Pressure Multistage Decoking Pump

● DESIGNATION OF THE PUMP SIZE 
Example 1. DM 160-120 x 3
DM—multistage & wear-resistant pump
160—capacity (m3/h)
120—head of each stage (m)
13—number of stages
Example 2.TDM 200-160 x 12
TDM—double casing multistage. Wear—resistant pump
200—capacity (m3/h)
160—head of each stage (m)
12—number of stages

● CONSTRUCTION 
DM pump is a mono casing, horizontal, sectional, multistage pumps. The tie bolts are used to fasten the suction casing, stage casings and delivery casing all together. All the stationary components are metal– to– metal connected and sealed by o-rings. The impellers are shrunk onto the shaft successively to make the rotor more rigid.
TDM pump is a horizontal, multistage pump of double casing construction, mainly accommodating barrel, cover and independent cartridge unit. The cartridge is inserted into the barrel and the cover is bolted onto the barrel at the discharge end with a gasket in between for sealing. The cartridge unit is made up by suction casing, stage casing, diffuser and rotating assembly. It is easy to remove for maintenance or repairing. The impellers are shrunk onto the shaft and axially located by retaining rings. The suction and discharge nozzles of DM/TDM pumps are all upwards. 
DM pump is foot mounted while TDM pump is center-line feet suspend. The axial thrust of the rotor is mainly balanced by a double balancing device.
Bearing:
The pump rotor is supported by two multi-lobe sliding journal bearings at both ends. A thrust bearing is arranged near the journal bearing at the discharge side to limit the axial play and absorb the axial residual thrust. The journal bearings and the thrust bearings are lubricated by pressure fed oil.
Shaft sealing:
DM pumps are sealed by packing. TDM pumps may be sealed by either packing or mechanical 
seals.
Driving:
The pumps are driven by motors through membrane couplings.
The pumps rotates clockwise, viewed from the driver.