Axially Split Multistage Between Bearings Pumps (API Class BB3)

The model HTB is horizontal, axially split, multistage, single suction(HTBD : double suction at 1st stage), double volute, centerline support, between bearings pump.
The HTB(HTBD) is suitable for high pressure, large capacity and a wide range of process and industrial applications.

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.
Compact design
Casing with compact crossovers minimizes friction loss on flow passages.
High reliability
Opposite impeller multi-stage arrangement provides pumps with thrust force balance. Double volute casing 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.
Easy maintenance
Overhaul can be carried out without removing main piping and driver. The volute casing is designed for easy removal of the rotor and easy inspection.

The casing is designed in full compliance with API610 (design pressure, nozzle external force, and moment, etc.).
Appropriate casing gasket can be selected to meet the operating specifications and the specific liquid to be used, assuring reliable sealing performance.
Centerline support design prevents misalignment caused by thermal expansion.
Suction and discharge nozzles are integrally cast with lower half casing, allowing removal of the rotor without removing the driver and piping.
Double volute construction reduces radial forces.
The volute casing is designed for easy removal of the rotor and easy inspection.

Closed single suction(HTBD : 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.
The impeller is positively secured along the shaft against axial thrust force by interference fit and sprit ring.
The impeller and rotor is dynamically balanced to meet the API610 requirement.
Opposed impeller stage arrangement reduces thrust loads and prolongs bearing life.

Renewable wear rings are furnished.

Shaft deflection is minimized for longer bearing life and shaft seal life.

Mechanical seal is applicable 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 anticoupling side) is designed to maintain the suction pressure for the mechanical seal.

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