FA1D56-01-05 Drive End Outer Shaft Sleeve: Fortifying the Transmission Safety of Boiler Feed Pump

As the "power hub" of the boiler feedwater system, the shaft sleeve at the drive end of a power plant's boiler feed pump booster pump, if it fails due to wear or corrosion, can lead to minor issues like seal leakage and equipment vibration, or major incidents such as pump shaft damage, shutdown, and production halt, resulting in significant economic losses for the power plant. The FA1D56-01-05 Drive End Outer Shaft Sleeve is custom-designed for the FA1D56 model booster pump. Leveraging its 1Cr17Ni2 stainless steel material, precise heat treatment process, and high compatibility, it serves as the "core protection component" ensuring the stability of the booster pump's transmission system. We also offer a full set of complementary spare parts, simplifying procurement for power plant operation and maintenance.

I. Product Overview: The "Core Transmission Protector" for the FA1D56 Booster Pump

The FA1D56-01-05 Drive End Outer Shaft Sleeve is not a common accessory; it is the "golden partner" that works in synergy with the inner drive end shaft sleeve (FA1D56-01-05). Together, they are fitted onto the outer side of the pump shaft (FA1D56-01-03A) at the drive end, forming a "dual protection layer" for the transmission system.

In actual operation, this shaft sleeve must fulfill two critical responsibilities:

1. Power Transmission: It must withstand the high torque transmitted by the impeller (such as FA1D53-01-01, FA1D56-01-09, etc.) through the impeller lock nut (FA1D56A-04), ensuring stable power transfer.
2. Sealing Protection: It must precisely cooperate with the mechanical seal (FA1D56A), mechanical seal cover (FA1D56-03-01), and seal cooling casing (FA1D56-03-03) to block leakage of the boiler feedwater medium and prevent direct friction between the pump shaft and the sealing components, thereby extending the pump shaft's service life.

As a spare part strictly manufactured according to the standards in the FA1D56 Booster Pump Repair Manual, its dimensional accuracy is fully compatible with other sleeves in the same series (such as FA1D56-01-15, FA1D56-01-07). It can be directly replaced during plant maintenance without additional machining, significantly shortening downtime.

II. Three Key Technical Advantages: Corrosion Resistance, Wear Resistance, and High Compatibility

1. 1Cr17Ni2 Stainless Steel: Adapted to Power Plant's Harsh Conditions

The shaft sleeve is made of 1Cr17Ni2 Martensitic stainless steel, conforming to the GB/T 1220 standard. The chromium content provides excellent anti-oxidation and corrosion resistance against long-term scouring by boiler feedwater. The nickel content enhances material toughness and strength, preventing the sleeve from deforming or fracturing even under high-temperature (≤ 300 °C) and high-pressure (≤ 2.5 MPa) conditions.

Compared to ordinary 304 stainless steel sleeves:

• Corrosion resistance improved by 40%
• Service life extended to over 24 months

2. Quenching + Low-Temperature Tempering: Enhanced Wear Resistance and Strength

Through the "Quenching (950 °C) + Low-Temperature Tempering (200 °C)" process:

• Surface hardness reaches HRC 32–36
• Tensile strength ≥ 1100 MPa

This means friction and wear with the mechanical seal and seal cooling casing are reduced by 60%, effectively preventing seal failure caused by sleeve wear. Simultaneously, it withstands the radial stress generated by the pump shaft's high-speed rotation, eliminating the risk of cracks and ensuring transmission system stability.

3. Precise Compatibility: Improving Maintenance Efficiency

The fit clearance between the shaft sleeve and the pump shaft, inner sleeve, and mechanical seal cover is controlled within 0.02–0.05 mm, perfectly matching the FA1D56 booster pump's design.

• A single technician can complete disassembly and installation within 1 hour
• No adjustment to other pump body components required
• Compatible with the same series of sleeves, reducing spare parts inventory variety and lowering inventory costs

III. Core Complementary Spare Parts for the Booster Pump

To meet the power plant demand for "One-Stop Procurement," we simultaneously supply a full set of spare parts compatible with the FA1D56-01-05 shaft sleeve:

IV. Core Application Scenarios: Covering the Entire Life Cycle of the Booster Pump

1. Installation in New Power Plants: Establishing a Stable Foundation

During the installation phase of the FA1D56 boiler feed pump booster pump in new thermal or nuclear power plants, this shaft sleeve must be assembled simultaneously with core components such as the impeller, pump shaft, and mechanical seal.

A new power plant reported that after installing the FA1D56-01-05 shaft sleeve, the initial vibration value of the booster pump transmission system was controlled to below 0.08 mm/s, significantly better than the industry standard of 0.15 mm/s, laying the foundation for stable operation after the unit is commissioned.

2. Routine Maintenance: Rapid Fault Prevention

During routine power plant maintenance, if wear (depth > 0.5 mm), scratches on the sealing surface, or signs of media leakage are found on the shaft sleeve, it must be replaced immediately.

One power plant failed to replace an aging shaft sleeve in time, leading to mechanical seal wear and leakage, resulting in a 2-day shutdown and a loss of 1.2 million kWh of electricity generation. By adopting the FA1D56-01-05 shaft sleeve, regular replacement can reduce the incidence of such failures by 90%.

3. Old Equipment Modernization: Cost Reduction and Efficiency Improvement

For FA1D56 booster pumps that have been operating for over 8 years, the original sleeves often cause reduced transmission efficiency due to material aging.

Replacing them with the FA1D56-01-05 shaft sleeve, along with upgrading accessories like the mechanical seal and gaskets, can:

• Increase equipment transmission efficiency by 5% to 8%
• Extend the overhaul cycle to 18 months
• Reduce shutdowns by 1–2 times per year
• Save the power plant approximately 150,000 Chinese Yuan per unit in maintenance costs annually

V. Procurement Services: Precise Response to Power Plant Needs

To address the customized and specialized needs in power plant spare parts procurement, we provide comprehensive service support for the FA1D56-01-05 shaft sleeve and complementary spare parts:

1. Professional Process-by-Drawing Capability: We can optimize design based on measured data from old equipment or special working condition requirements (e.g., thickening the sleeve wall in high-wear environments) to ensure custom parts precisely match the original equipment and meet non-standard O&M needs.
2. Full-Process Quality Control: A test report is generated for every step—from raw material selection and processing precision inspection to finished product performance testing—ensuring part quality is consistent with the original manufacturer.
3. In-Depth Technical Collaboration: We assist power plants in compiling spare parts requirement lists and developing coordinated replacement plans for the shaft sleeve and sealing components.