Wet pit single-shell vertical diversion pump

The wet pit single-case vertical diversion pump is a multi-stage radially split vertical centrifugal pump, which fully implements the API 610 11th edition "Centrifugal Pumps for Petroleum, Heavy Chemical and Natural Gas Industries" standard. The VMC pump first impeller is at the lowest end of the pump. And it is a suction impeller, which can meet the demanding requirements of the device for cavitation performance. The pump is equipped with a balance drum device to balance the axial force, and the residual axial force is balanced by a pair of diagonal contact ball bearings. The angular contact ball bearings in the bearing housing are lubricated by lubricating oil and have an independent internal circulation automatic lubrication system to improve the service life of the bearings.

Performance range

Specification DN: 40~200mm

Flow Q: ~800m3/h

Head H: ~800m

Working pressure P: ~10MPa

Operating temperature: -20°C~120°C

Rotational speed n: 1470 or 2950r/min

Structural features

1. Pump body and support pipe

◆ VMC is a multi-stage submerged pump structure, the pump body is installed in the medium pool liquid, and the installation depth of the pump body is determined by the cavitation allowance of the device and the cavitation allowance of the pump, which can ensure that the pump does not cavitate in a harsh environment.

◆ The structure of the support pipe adapts to the requirements of the medium conveyed by the pump. Between the two support pipes, an intermediate guide bearing is installed, and the span between the guide bearings meets the requirements of the API610 standard to ensure that the allowable continuous speed is lower than the first critical speed, and the rigid shaft is designed to ensure the smooth operation of the pump and the vibration is small to the greatest extent.

2. Impeller and guide vane

◆ The first stage impeller is generally a suction impeller, which can improve the cavitation performance of the pump.

◆ Each specification has several sets of impellers and guide vanes, which are suitable for different operating requirements, with stable performance, high efficiency and low NPSHr value.

3. Bearing body and lubrication

◆ Paired angular contact ball bearings are used to bear the residual axial force and rotor weight.

◆ The large oil storage chamber of the bearing box is equipped with an independent internal circulation automatic lubrication system, which can not only effectively lubricate the bearing, but also make the bearing oil temperature uniform, and ensure the long-life operation of the bearing.

◆ When the temperature of the conveying medium is high, the cooling device can be used to reduce the temperature of the oil chamber.

◆ Large capacity design of oil chamber and large oil storage capacity.

◆ The constant oil cup compensates the lubricating oil online, and the oil level gauge detects the oil level in real time.

◆ The bearing parts can be disassembled and assembled as a whole, which is easy to maintain.

4. Balancing device

◆ Balance drum device is used to balance the axial force

◆ Through the connection between the pipe and the rear end of the balance drum, the pressure of the mechanical seal cavity can be reduced.