Mechanical Seal Cover FA1D56-03-01: The Seal Protection Shell for the Booster Pump

When you start an overhaul on an FA1D56 series booster pump, the first thing you see when you dismantle the sealing system is the FA1D56-03-01 Mechanical Seal Cover. This thing is made of 2Cr13 stainless steel and looks solid, but it's actually the sealing system's front door—it holds the seal parts tight, blocks the fluid from leaking out, and creates a stable environment for the seal to work in. It can't do its job alone; it needs to cooperate with the seal locating ring and the cooling shell. Without its precise positioning, the whole sealing system is useless.

I. Custom Core: Seamless Integration with the FA1D56

This seal cover is tailor-made for the FA1D56 booster pump. The dimensions follow the repair manual exactly, and the connection tolerance with the FA1D56-03-08 flange is perfect. During installation, you have to use the FA1B56-A3-400134 locating pins to align it precisely. This ensures the gap between the cover and rotating parts—like the impeller and impeller lock washer—meets the spec. Too big a gap, and it leaks; too small, and it rubs the parts. It has to be just right.

Power plant maintenance crews hate it when the spare part doesn't fit. This seal cover from Dongfang SRI is a drop-in replacement for the original parts; no need to modify the pump body structure. It works with the entire seal and drive system, making it crucial for cutting downtime and speeding up repairs. Here are the main matching components for the FA1D56 booster pump sealing system. Check this list during overhaul to save you trouble:

II. Durability Secrets: Double Insurance on Material and Process

2Cr13 Stainless Steel: The Best Balance of Strength and Cost

The seal cover uses 2Cr13 Martensitic Stainless Steel. After quenching and tempering, the hardness hits HRC 48-52. This gives it excellent tensile strength and wear resistance. When the booster pump is running high-pressure and high-speed, the vibrations are serious, but this material's strength handles the shock. When temperature fluctuates, its good toughness stops it from cracking. We know one plant used a cheap carbon steel cover that wore out in less than 6,000 hours; after switching to this one, it ran for 12,000 hours without issue.

Why not use 304 stainless steel? Simple: the fluid in a power plant booster pump is low-chloride boiler feedwater, so the corrosion isn't severe. 2Cr13 is plenty corrosion-resistant and balances strength with cost, giving you better value. Plus, the cooling cycle provided by the seal cooling shell cuts down corrosion even further.

Precision Machining: Details That Mean Peace of Mind

2Cr13 material tends to harden quickly, which can cause cracking if machined incorrectly. We use specialized tools and optimize cutting parameters and temperature to avoid this entirely. The seal face roughness is controlled to Ra less than 0.8μm, making it slick and burr-free. The clearance between the inner bore and the seal locating ring is kept tight, between 0.02 mm and 0.05 mm. You can install it without any on-site grinding.

Because maintenance often requires welding, we added a dedicated welding groove. Preheat the part before welding, use specialized welding rod, and you can securely weld it to the pump cover and flange. This solves the tricky problem of 2Cr13's generally poor weldability. One mechanic told us this design was incredibly thoughtful; it saved him half the welding time compared to the non-standard part they used before.

Full System Compatibility: It Plays Well with Others

This seal cover is designed with the FA1D56 booster pump's whole structure in mind: The interface with the seal cooling shell handles the gasket thickness, so no leaks. Its position relative to the drive end bearing housing perfectly protects the oil deflector ring, preventing lube oil contamination. Its outer size doesn't conflict with parts like the pump casing wear ring or the short pipe, keeping the pump structure compact.

Swapping it in is easy—it directly replaces the original part. When you check the impeller key and bearings at the same time, you cut downtime significantly. One thermal power plant reported that using our seal cover cut their overhaul period from 8 hours down to 4 hours. Downtime loss was instantly halved.

III. Maintenance Use: When to Change It? How to Use It?

Mandatory Replacement: Don't Hesitate in These Three Cases

During the FA1D56 booster pump overhaul, the seal cover is involved in three key scenarios: It must be replaced at the same time as the seal parts, upgrading it alongside the seal locating ring and cooling shell to ensure the whole system performs well; if the seal cover itself is worn, corroded, or deformed, it needs an emergency replacement, or fluid leakage will shut the unit down; and finally, it should be preventatively replaced during major overhauls. The manual requires checking it every 8,000 hours of operation—if there's a problem, swap it fast.

Make sure you coordinate its overhaul with the thin-walled radial bearing and the drive end bearing housing. We offer full technical support to ensure standardized procedures. One nuclear maintenance team said that after using our cover and matching parts, their seal leakage rate dropped below 0.03 mL/min, far better than the standard.

Spare Parts Stock: The Plant's Peace of Mind Inventory

For a power plant, this seal cover is critical inventory. When equipment fails unexpectedly, having the spare part immediately available is key. Dongfang SRI offers complete supply kits for the seal cover and all associated spares, with ample stock. We can ship the same day in an emergency.

You can even use it for older pump upgrades. By adjusting the pump casing wear ring clearance to match, you can reduce leakage and boost the pump set's efficiency. One old plant increased its booster pump operating efficiency by 6% after the upgrade, saving significant power costs annually.

Special Conditions: Adding an Anti-Corrosion Buff

Corrosion risk is high in coastal or high-humidity plants. While 2Cr13 is resistant, adding a surface coating can provide extra protection. We can offer custom versions with an anti-corrosion coating. These still work perfectly with parts like the oil deflector ring and locating pins, ensuring the seal cover lasts longer in harsh environments.

Choosing the Right Spare: Dongfang SRI Saves You the Trouble

The sealing reliability of the FA1D56 booster pump is entirely down to this small seal cover. Every batch of Dongfang SRI's FA1D56-03-01 seal cover undergoes material analysis, hardness testing, and precision calibration. It's laser-marked with the model, so you don't confuse it with other spares.

Whether it's for routine checkups, emergency fixes, or stocking spares, we offer a one-stop service: The quality of everything—from the seal cover to the matching locating pins and gaskets—is reliable; our technical team is available 24 hours a day for installation questions; and for bulk orders, we help you plan your stock so you don't have too many or too few parts.

Don't let a bad seal cover slow down your maintenance or hurt equipment operation. Dongfang SRI focuses on core power plant spares, making every overhaul reliable and efficient. For any needs or technical questions, contact us anytime to give your FA1D56 booster pump a reliable Seal Protection Shell.

HKCYT-2025-12-15