Alfa Laval Heat Exchangers & Pumps: 7 Questions Process Engineers Actually Ask

What you need to know about Alfa Laval equipment — no fluff

If you're a process engineer or plant manager evaluating Alfa Laval gear, you probably have the same questions I had when I started specifying their heat exchangers and pumps. I've been on both sides — specifying this equipment and handling the inevitable emergency replacements when something fails on a Friday afternoon. Here are the questions I hear most often, with answers based on real project experience.

1. What's the real difference between Alfa Laval plate heat exchangers and shell-and-tube?

Short answer: It's about space, efficiency, and maintenance — not just cost.

Honestly, I used to think the choice was mostly about budget. After about 15 projects, I finally got it. Alfa Laval gasketed plate heat exchangers (like the M-series) are typically more compact and offer better heat transfer coefficients for liquid-to-liquid duty. You can get a plate exchanger with the same duty as a shell-and-tube in about 30-50% less floor space.

But here's the trade-off: plate exchangers are more sensitive to fouling and pressure. For dirty fluids or high-vapor applications, shell-and-tube is still the safer call. I learned this the hard way in 2022 when we had to retrofit a plate exchanger on a starch slurry line — within six months, the plates were caked. We swapped it for a shell-and-tube and haven't touched it since.

Take this with a grain of salt, but my rule of thumb now is: plate exchanger for clean fluids where space is tight, shell-and-tube for anything viscous or dirty.

2. Is the Alfa Laval LKH centrifugal pump actually better than the competition?

Short answer: For sanitary applications, yes — but it depends on your CIP requirements.

The LKH series is a workhorse in dairy and beverage. The key advantage is the clean-in-place (CIP) capability and the fact that you can change the mechanical seal without disconnecting the motor. That might not sound exciting, but if you've ever had to tear down a pump in the middle of a 24-hour production run, you know exactly why this matters.

In my role coordinating pump selection for a food processing facility, we standardized on LKH pumps for all our CIP-able lines. Over 47 pumps installed, we've had two seal failures — both swapped in under an hour. To be fair, GEA and SPX Flow have comparable pumps. The LKH just feels better engineered for serviceability. But you'll pay a premium — about 15-25% over entry-level sanitary pumps.

If your maintenance team values quick seal changes above all else, the LKH is hard to beat.

3. Can I use an air compressor instead of an Alfa Laval compressor for my cooling system?

Short answer: No — they serve completely different functions.

This question comes up more often than you'd think. An air compressor for your car or shop tools is generating compressed air for pneumatic tools. An Alfa Laval compressor (or any industrial refrigerant compressor) is part of a closed-loop refrigeration system — it compresses refrigerant vapor, not air.

The difference is basically apples and engines. An air compressor pushes air into a tank for intermittent use. A refrigeration compressor is designed for continuous duty in a sealed system, with specific pressure and temperature ratings for refrigerants like ammonia or R-134a.

Personally, I've seen people try to jury-rig automotive air conditioning compressors into small cooling systems — and it almost always ends with a call to our team asking for a real solution. If you're building an ice maker machine or industrial chiller, use the compressor designed for that application. Don't save $200 now and spend $2,000 on a replacement later.

4. How do I choose the right ice maker machine for my facility?

Short answer: Match capacity to your peak demand, not average usage.

I see this mistake all the time. A facility manager calculates average ice usage, buys a machine that meets that number, and then gets burned when a production spike hits. Alfa Laval doesn't make standalone ice makers, but they do make the plate heat exchangers and separators used in commercial ice machines and industrial cooling processes.

If you're buying an ice maker for a food processing plant, look at the evaporator design. Flake ice machines use a rotating drum evaporator, while cube machines use a grid evaporator. Flake ice is better for rapid cooling of products (think seafood or poultry), while cubes are better for beverages or display purposes.

The evaporator coil cleaning question everyone asks? That's next.

5. How to clean evaporator coil — and what happens if you don't?

Short answer: Clean it at least twice a year, more in dirty environments.

Dirty evaporator coils are the number one cause of reduced cooling capacity. The coil is where heat exchange happens. When dust, grease, or debris builds up on the fins, the air can't flow properly, and the system loses efficiency. I'm not 100% sure of the exact formula, but I've seen a 10-15% drop in capacity from a moderately dirty coil.

Here's a practical method I've used on multiple sites:

1. Turn off power — obviously. Don't skip this.
2. Brush off loose debris — use a soft brush or compressed air. Don't bend the fins.
3. Apply a coil cleaner — use a non-acid-based cleaner for most environments. Acidic cleaners can corrode the fins over time.
4. Rinse thoroughly — low pressure water, not a pressure washer. High pressure can bend fins.
5. Let dry completely — before turning back on.

The worst case I saw was a facility that hadn't cleaned their coils in three years. The compressor was running constantly, drawing high amps, and eventually tripping on thermal overload. The repair cost about $4,000 — the cleaning would have been $400. Do the math.

6. How reliable are Alfa Laval heat exchangers in continuous process duty?

Short answer: Very reliable with proper maintenance — but gasket life is the limiting factor.

In my experience managing over 60 installations in the past 5 years, Alfa Laval plate heat exchangers have a failure rate of about 2-3% per year in continuous duty. That's pretty good — comparable to Kelvion and better than some budget brands. The gaskets are usually the first thing to go. Typical gasket life is 3-5 years, depending on temperature and chemical exposure.

For gasketed plate heat exchangers, Alfa Laval uses a clip-on gasket system (for newer M-series units) that's much easier to replace than older glued designs. You can regasket an M10 in about 2-3 hours with the right tooling.

If your process runs 24/7, I recommend having a spare gasket kit on hand. When a gasket fails, you're looking at 4-8 hours of downtime to strip, clean, regasket, and reassemble. Having the kit saves the 24-hour shipping wait.

7. What's the biggest hidden cost when buying Alfa Laval equipment?

Short answer: Installation and commissioning — not the equipment itself.

I get why people focus on the sticker price. Budgets are real. But in my experience, the installed cost of an Alfa Laval heat exchanger is often 40-60% higher than the equipment cost alone. You've got:

• Piping and fittings — especially if you need sanitary tri-clamp connections
• Mounting frames and support structures
• Control valves and instrumentation
• Commissioning — Alfa Laval offers this as a service, and it's not cheap but worth it

Granted, this isn't unique to Alfa Laval — any industrial install has these costs. But if you're comparing quotes, compare total installed cost, not just the heat exchanger price. A $10,000 budget quote can easily become $16,000 once everything's in place.

To be fair, the reliability usually pays back the premium within 2-3 years. But you need to budget for it upfront.

If you ask me, that's the one thing procurement teams consistently miss. The cheapest quote rarely stays the cheapest through commissioning.