The Key to Accurate Thrust Bearing Clearance: The FA1D56A Booster Pump Bearing Housing End Cap

Why must the bearing housing end cover be tightened during measurement?

The FAID56-02-02 (05) bearing housing end cap is the reference base for the pump's bearing assembly. Its installation status dictates the accuracy of your measurement. The DL/T 801-2010 standard specifies the ideal thrust bearing clearance for the FA1D56A pump as 0.30–0.50mm. Obtaining this number requires a perfectly fitted end cap and housing. Dongfang SRI's FAID56-02-02 (05) End Cap is a 1:1 replica of the original equipment for both drive and non-drive ends. Once tightened, the housing and cap fit tightly, allowing the thrust pads to be in their true working stress state, providing a stable reference for clearance measurement. If the end cap is not secured, the bearing assembly shifts slightly, the measurement baseline deviates from the real operating condition, and the resulting data is worthless.

The impact of an unsecured end cap is multifaceted:

• Measurement Data Distortion: An untightened cap causes uneven force on the bearing housing. Clearance readings can be understated by 10%–30% or show a false clearance, violating the accuracy range required by the DL/T 801-2010 standard.
• Misguided Repair Decisions: Engineers may rely on this wrong data to blindly adjust bearing preload or unnecessarily replace parts, increasing maintenance costs and potentially causing secondary failures.
• Operational Failure Risk: If the pump is assembled using bad data, it becomes prone to thrust bearing wipe, excessive rotor axial runout, and increased pump body vibration during operation, severely impacting the continuous running of the power station.

Dongfang SRI FAID56-02-02(05) End Cap Solution

Dongfang SRI's FAID56-02-02(05) End Cap is custom-designed for the FA1D56A Booster Pump, meeting needs for both the free (non-drive) and drive ends. The product is made from high-strength cast iron, precisely machined to control geometric tolerances. Once fastened, it won't shift or move, accurately recreating the in-service stress state of the bearings. The cap features standard bolt holes, and when installed with the specified torque, the thrust pads are precisely positioned. This ensures clearance data fully complies with the DL/T 801-2010 standard, eliminating maintenance errors caused by reference deviation.

As a critical accessory for power station maintenance, this end cap is the preferred choice for FA1D56 series pump maintenance, thanks to its high compatibility, precision, and stability. Choosing the correct, compliant end cap and strictly following the DL/T 801-2010 standard is the only way to ensure accurate thrust bearing clearance measurement, building a solid foundation for safe and efficient power plant operation.

Complementary FA1D56A Parts

In addition to the core FAID56-02-02 (05) Bearing Housing End Cap, Dongfang SRI provides a full range of compatible parts for the FA1D56A Booster Pump, covering critical maintenance steps, offering a one-stop solution for power plants.

HKCYT-2025-11-20