CG Type High Pressure Multi-Stage Centrifugal Pump

Brief of Construction for CG Pump:

CG pump are radially split ring section pump with radial impellers, single or double flow, multistage. The suction and discharge casing are casting or forged of strong material Suction and discharge flanges are

welded on the respective casing. The orientations of suction and discharge nozzles are generally pointing vertically upward and also pointing downward as required.The stages are clamped together by tie bolts and

sealed off against each other by O-rings or by metallic sealing faces Spiral wound gasket is used as stationary seal between suction discharge casing and suction section discharge cover. The axial thrust force is

accommodated by balance disc or piston,the residual thrust force and additional axial force in special operation condition are accommodated by thrust bearing. Dependent on requirement, the pump with balance disc

is possible to have a lift-off device.Either packed gland or mechanical seals can be used at both ends.Bearings at pump ends are high quality anti friction bearing slide bearing or titling pad thrust bearing. The bearing

lubrication can be accept by oil ring lubrication or force feed oil lubrication. The bearings,seals and balancing device of pumps can be replaced or inspected without dismantling suction and discharge nozzles.

CG type pumps are generally provided with monitoring instrument to monitor the unit in operation and to avoid the major failure.

1-Temperature measuring instruments for major bearings

2-Various pressure indicators.

3-Differential pressure indicater for suction filter.

4-Controlling device for the minimum flow device (supplied with the minimum flow device as a complete set)

Driving of Pump Unit

direct driving:

pump -electric motor

pump一 steam turbine

pump 一 internal combustion

indirect driving:

pump一 hydraulic coupling一electric motor

pump一gearbox一electric motor

installation profile and dimension for pump unit shall be supplied separately after arraignment is determined upon customer's requirement.

Mainly Design Features for Pumps as Follows

CG type high pressure centrifugal pump is the most advanced and perfect products of company in developing the new concept.Special importance was attached to functional safety of the pressure boundary.

Trouble-free functioning under all operating conditions.high economy over the entire operating period,and a very modest expenditure for preventive. maintenance.and overhaul. The following

descriptions are mainly design features for pumps:

1-Advanced combination of modularization design,Fewer parts,with time-tested subassemblies ano a high degree of parts recurrence.

2-Quick assembly and disassembly design. Allowing replacement of seals bearing and balancing device without having to disassemble the pump casing and nozzles short downtime for overhaul and inspection.

3-The optimum combination of high reliability,high efficiency and low costs.

4-A combination of high efficiency, high reliability and low cost. Through the optimal matching of impeller and guide vane, as well as reasonable matching clearance and wide axial throttling design,

the CG high-pressure multi-stage centrifugal pump can still maintain its high stability and extremely high operation after long-term operation. efficiency.

5-Good NPSHr values By optimal for a suction impeller or a double-flow in take it needn't booster pumps or elevated feed tank.

◆ Axial-thrust is compensated by a disc,piston and double piston.Antifriction bearing or segmental thrust bearing absorbs the residual axial thrust.By opting for lift-off device of anti friction or tilting thrust bearing,it can

avoid the risk of falling and grabbing between balancing disk and balancing counter disk during off-design conditions.

◆ Safety casing seal design.Depending on the pressure and structure the casing and stages are sealed off against each other by metal spiral gasket or O-ring and metallic sealing faces.

◆ Unique structural strength design and core-pulling design. It allows the single-stage lift of the pump to reach 80bar and the outlet pressure to reach 420bar. It also makes the core package components composed of bearings

and rotors not affected by temperature changes and has excellent thermal shock resistance.

◆ Strong,wrought-steel casing elements and high-quality materials and numerous possible nozzle sizes or orientations.The pumps are geared to coping with high-to-exceptional system forces and moments and the customers

special-case requirements are met quickly and easily.

◆ According to customers requirements,the system can also have part flow nozzle and minimum-flow valve.