Padially Split Multistage Double Caing Between Bearing Pumps (API Class BB5)

The model BTBF is horizontal, radially split, multistage, single suction (BTBFD=double suction at 1st stage), double casing, diffuser guide-vane type, centerline support, between bearings barrel pump.
BTBF(BTBFD) is suitable for high pressure, high temperature, high speed, (BTBFD=for low NPSH), other wide range of heavy duty process and industrial applications.

Heavy duty construction is full compliance with API610
Seal chamber
Seal chamber dimensions are in full compliance with API682 and API610 standards, and dual seals can be installed with our standard seal chamber dimension.
Easy maintenance
Overhaul can be carried out without removing main piping and driver.
High reliability
Balance drum reduces thrust force to an optimum level. Diffuser guide vane provides internal radial force balance.
The full-circular construction of the bearing housing and high precision dynamic balance ensure stable operation and long bearing life.
Self vent
Both the discharge and suction nozzles are placed on the top, which allow self venting and realize a smooth start up.

The casing is designed in full compliance with API610 (design pressure, nozzle external force, and moment, etc.).
The cylindrical high quality grade steel forging assure the strength necessary for safe operation under high pressure at all temprerature.
Radially split outer casing is metal-to-metal fitted with a controlled compression gasket which ensures perfect sealing without misalignment.
Centerline support design prevents misalignment caused by thermal expansion.

Closed single suction(BTBFD : double suction at 1st stage) multistage impeller is designed to meet the wide range of specific operating condition with the maximum efficiency and low NPSH-required.
Impeller vanes are radially staggered against diffusers one to avoid vane-pulsation buildup. The impeller is positively secured along the shaft against axial thrust force by interference fit and sprit ring.
The impeller and rotor are dynamically balanced to meet the API610 requirement.

Renewable wear rings are furnished.

It minimizes shaft deflection for longer bearing and seal life. Double key ways on the shaft reduces the difficulty and time required for performing fine tolerance balancing.

Shaft seals and seal chamber
to all seal types and plans in accordance with API682 and API610. Upon request, gland packing can be installed.
By using the balance line, seal chamber pressure of both side (coupling and anti-coupling side) is designed to maintain the suction pressure for the mechanical seal.

Full circular bracket construction minimizes vibration of bearing housing. Pump vibration is much lower than the limit of API610. If high temperature service is specified, suitable cooling system is furnished.

Bearing lubrication systems are available in three different configurations, all in compliance with API619, to meet various service conditions.

ball radial and angular contact ball thrust / flooded lubrication
sleeve radial and angular contact ball thrust / oil ring lubrication
sleeve radial and tilting pad thrust / pressurized lubrication

Balance drum reduces thrust force to an optimum level and prolongs bearing life.

Precision machined inner casing of forged steel has improved machining accuracy, surface roughness and reliability of materials.
Intermediate covers with radial split and metal to metal fit structure minimize internal leakage and misalignment.
Diffusers with equally spaced multiple vanes equalize the pressures at all points around the impellers, which provides radial force balance and, as a result, eliminates shaft deflection.