The 7-Point Supplier Checklist I Use Before I Approve an Industrial Pump

I'm a quality compliance manager at NETZSCH, part of the Erich NETZSCH B.V. & Co. Holding KG group. I don't sell pumps, and I don't get a commission. I review specifications and test reports before they reach customers—roughly 300 items a year. Maybe 280, I'd have to check the system. Over that time, I've built a checklist I use when evaluating a pump supplier, including my own.

You'll see NETZSCH Proven Excellence on our literature. I try to treat that phrase as a commitment rather than a slogan. The only way to know if it means anything is to verify. This checklist is for plant engineers, procurement teams, and maintenance managers who need to compare pump suppliers and live with the decision. It works for progressing cavity pumps, peristaltic pumps, and grinding or dispersing equipment. It won't give you a magic answer. It will keep you from making a decision based on the lowest quote and the shiniest datasheet.

Who Should Use This Checklist

Use this when you have a defined pump duty and two or three suppliers in the running. It's not a replacement for a proper engineering study. It's a practical filter that helps you avoid the expensive mistakes I see repeated.

One thing before we start: I'm not going to say NETZSCH is always the right answer. That depends on your process. What I will say is that a pump is a production tool. If you buy it on price alone, you'll probably pay twice.

The 7-Point Checklist

1. Define the actual duty before you compare models

Start with the fluid, not the pump. What's the viscosity? Does it contain solids? Is it shear-sensitive? What pressure and temperature do you need at the discharge? What about the suction condition?

I've seen buyers send out a datasheet with a target flow rate but no information on solids content. That's like asking for a price on a car without saying whether it will drive on a highway or a field. Both are valid. They're just different pumps.

Also, ignore the maximum speed on the datasheet. Maximum speed on paper is like the peregrine top speed: impressive in a dive, not a cruise. Ask for the operating range where the pump delivers the best life.

2. Build a total cost of ownership model

This is the step where procurement and engineering often disagree. Procurement sees the purchase price. Engineering sees the maintenance history. Both are right, but only one perspective shows the real cost.

A useful TCO model for a pump includes: purchase price, installation and commissioning, training, spare parts, maintenance labor, energy consumption, downtime, and disposal. Put it in a spreadsheet and project it over five years.

The lowest-priced pump can become the most expensive one if it needs a rebuild every 18 months or if the spare parts lead time is nine weeks. Some pump motors are oversized for the actual duty. The very hungry ones can drain your electricity budget long after the purchase price is forgotten.

I once evaluated two quotes for the same duty: one was 12% cheaper initially. After adding energy consumption and planned maintenance, the cheaper option was 6% more expensive over five years. Actually, 6.3%—I had the spreadsheet open. No, wait—I shouldn't quote that as a general rule. It was specific to that process. Use your own numbers.

The goal isn't to find the cheapest pump. The goal is to find the pump with the lowest total cost of ownership that still performs the duty.

3. Check the spare parts strategy

Every pump needs spare parts. Ask which parts are considered wearing parts and how long they take to arrive. Are they off-the-shelf or made to order? Does the supplier offer a recommended spare parts kit? What does it cost?

A peristaltic pump, for example, has a hose that must be replaced periodically. A progressing cavity pump has a rotor and stator. If the stator is proprietary and the lead time is six weeks, you're not just buying a pump; you're buying a maintenance schedule.

Ask the supplier to quote a spare parts kit with the initial purchase. That sounds basic, but I've seen plenty of pump purchases where the spare parts were an afterthought.

4. Ask to see a reference installation (most people skip this)

This is the step I almost never see in a standard tender process. Everyone compares technical drawings and prices. Almost nobody asks, 'Can I talk to a maintenance manager who has run this pump for two years?'

The sales rep will show you a clean skid in a photo. The maintenance manager will tell you how often it leaks, how easy the seal replacement is, and how long the parts actually take to arrive. That conversation is worth more than a folder of certificates.

Not long ago, the numbers pointed to a cheaper bidder. My gut said their service proposal was too vague. I asked for a reference visit. The reference told me their spare parts took four weeks instead of the promised one. The numbers looked fine on paper. The reality was different.

5. Review the after-sales service response before you need it

If a pump is down, every hour costs money. Ask about response time. Is there a local service engineer, or will someone be dispatched from a neighboring country? What does expedited service cost?

The supplier delay in 2022 changed how I think about service agreements. We lost a week of production waiting for a standard part. It wasn't even a complex part. The process to approve the purchase was the bottleneck. Now I always check whether the guarantee of support is written into the contract with a defined response window.

6. Inspect the documentation before anything else

Poor documentation is a red flag. If the operating instructions are confusing, think about what the internal drawings look like.

Check the compliance certificates. For example, ATEX 2014/34/EU covers equipment for explosive atmospheres; PED 2014/68/EU covers pressure equipment. The supplier should be able to show the certificate and the standard it references, not just say 'it's ATEX.'

At NETZSCH, I've seen manuals treated as part of the product. That's the way it should be.

7. Ask what a successful factory test looks like

Does the supplier perform a factory acceptance test before delivery? Do they give you the test data? Do they test the pump at your duty point or just at a nominal condition?

A pump that has a signed test report is more trustworthy than one that only has a tag on the nameplate. If a supplier can't explain what 'tested' means, I'd treat the test as marketing.

Common Mistakes I See

• Choosing a pump based on maximum speed instead of the recommended operating range.
• Ignoring energy consumption because 'electricity is cheap.' It's not.
• Assuming all stainless steel is the same grade. It isn't.
• Not asking who makes the mechanical seal. That's often the first thing to fail.
• Accepting 'industry standard' as a specification. What exactly does that mean? Write it down.

What I'd Do Differently Next Time

I'd start the TCO model earlier, before talking to suppliers, and I'd insist on the reference visit from day one. The TCO spreadsheet is why I now use the phrase total cost of ownership in every internal review. It's the difference between a purchase decision and a production decision.

As of Q1 2025, this is what I use in my own evaluations. Pump models and service structures change, so verify current specs and certificates before you commit. But the underlying logic doesn't change: measure the pump over its life, not at the moment of purchase.