Why Feedwater Pump is Failing: Upgrade the HPT300-340-04-06 Wear Ring, Stop the Leaks

The Core Problem: Precision and Wear

Big steam turbine setups, nuclear plants, and heavy industry power systems all rely on the pre-pump—the booster for the main feedwater pump. How well it runs totally hits the unit's safety and how much energy it burns. The HPT300-340-04-06 wear ring, which lives inside the pump casing, is the absolute heart of keeping pressure up and leakage down. Getting its material and fitting just right is serious business.

Technical Requirements for FA1D56A Wear Rings

According to the official repair documentation, like the DL/T 801-2010 Technical Specification for Large Steam Turbine Generator Set Booster Pumps, the FA1D56A casing wear ring has to slot exactly into the pump body's special notch. It needs a specific gap with the impeller.

If that clearance is too big, internal leakages go nuts, pump pressure drops, the motor starts drawing too much current, and you get huge vibrations—like jumping from a quiet 3mm/s to a really scary 8mm/s or more. Equipment life is definitely cut short then.

Why Swap to the Dongfang SRI HPT300-340-04-06?

The OEM rings just don't last long, right? They get eroded fast under the high heat, pressure, and crazy flow rates. So, Dongfang SRI made this high-spec replacement, the HPT300-340-04-06 wear ring, built specifically for the HPT300-340 pump model. It fixes the common issues and has three key benefits:

1. Perfect Fit, No Fuss

This thing is built exactly to the DL/T 801-2010 specification. The Outer Diameter, Inner Diameter, and where it sits axially match the pump's groove perfectly. No need to file it down or modify anything during install. You won't get that weird, uneven wear or a leakage pathway because it sits crooked.

2. Tight Clearance, Big Savings

We use CNC precision machining and heat treatment—keeps the radial gap under 0.55mm coming straight out of our factory. Less leak means the pump works way better. We've seen efficiency jump over 5% in tests. That's a huge electricity bill drop yearly—potentially tens of thousands of dollars saved.

3. Tougher Materials for Longer Life

We don't use weak cast iron. This is a high-strength stainless steel body with some special hardening on the surface. It handles erosion and corrosion way, way better. Life is extended by 30% on average, meaning fewer nasty, unplanned outages.

Installation Pointers & Check-Up

• Before: Clean out the pump groove and the new ring. Get rid of all the old gunk, rust, and any sealant residue completely.

• During: Push it in gently, following the way the impeller spins. Do not hit it with a hammer. You'll bend it, and it won't work.

• After: Grab an internal/external micrometer and measure the gap between the impeller and the ring. Must be within the new part standard range.

• Routine: Write down discharge pressure, motor current, and vibration levels every shift. Monthly, just check the bolts are still tight. The gap must be measured during every big overhaul—if it's out, swap it immediately.

Proof in the Field: Better Efficiency, Less Shaking

A 600MW power station did the switch during their big maintenance stop. They put in our HPT300-340-04-06 replacement ring.

• The pump's vibration went from a worrisome 8.2mm/s way down to a smooth 2.9mm/s.

• Discharge pressure became way steadier.

• The yearly power saving was over 120,000 kilowatt-hours.

• They got their money back in less than six months.

Dongfang SRI is all about key parts for power plant pumps and valves. The HPT300-340-04-06 is ready to ship now, and we offer full technical support and custom options. Stop delaying—upgrade that pre-pump wear ring. Make every run efficient, steady, and use less power!

Other Related HPT300-340 Series Components

Besides the wear ring, we carry a complete line of HPT300-340 pump spares.

HKCYT-2025-11-06