{"id":3583,"date":"2026-10-26T12:30:45","date_gmt":"2026-10-26T04:30:45","guid":{"rendered":"http:\/\/www.votonmachinery.com\/blog\/?p=3583"},"modified":"2026-10-26T12:30:45","modified_gmt":"2026-10-26T04:30:45","slug":"what-are-the-disadvantages-of-using-a-metering-pump-4db0-5ed1c3","status":"publish","type":"post","link":"http:\/\/www.votonmachinery.com\/blog\/2026\/10\/26\/what-are-the-disadvantages-of-using-a-metering-pump-4db0-5ed1c3\/","title":{"rendered":"What are the disadvantages of using a metering pump?"},"content":{"rendered":"

If you\u2019ve spent any time in industrial fluid handling, you know metering pumps are the go-to for precise, consistent dosing of chemicals, reagents, and process fluids. As a metering pump supplier, I\u2019ve helped hundreds of operations across water treatment, pharmaceuticals, food and beverage, and chemical manufacturing set up their dosing systems\u2014so I\u2019ve seen firsthand how these pumps can streamline workflows. But I\u2019ve also seen their downsides, especially when teams don\u2019t account for how mismatched specs, improper installation, or regular maintenance gaps can turn a precision tool into a costly headache. Today, I want to pull back the curtain on the less talked-about disadvantages of metering pumps, from the perspective of someone who sells and supports them daily. Metering Pump<\/a><\/p>\n

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First, let\u2019s get one thing straight: metering pumps aren\u2019t one-size-fits-all. That\u2019s probably the most common mistake I see new customers make, and it leads to the biggest headaches. Many people assume any pump that delivers a fixed volume per stroke will work, but that\u2019s not true. For example, a positive displacement metering pump, the most popular type for industrial use, relies on a few components to control flow: a check valve, a diaphragm or piston, and a stroke adjustment mechanism. If your application requires high-viscosity fluids\u2014like thick brines, polymer solutions, or viscous adhesives\u2014those standard check valves can\u2019t seal properly. I once worked with a small food processing plant that installed a generic metering pump to dose fruit preservative into their juice batches. The preservative was a 2,000 centipoise (cP) gel, and the pump\u2019s tiny check valve couldn\u2019t handle the thickness. Over a week, the valve wore out, flow became inconsistent, and they ended up with 1,200 gallons of out-of-spec juice they had to discard. That\u2019s not a minor inconvenience\u2014it\u2019s thousands of dollars in lost product, and all because the customer didn\u2019t verify the pump\u2019s compatibility with their fluid.<\/p>\n

Another big issue with positive displacement metering pumps is their sensitivity to back pressure fluctuations. These pumps are designed to deliver a fixed volume per stroke, so if the pressure in the discharge line shifts unexpectedly, the flow rate can change. Let\u2019s say you\u2019re dosing a chemical into a municipal water treatment plant: the process pressure might vary slightly as the plant\u2019s water demand rises and falls throughout the day. A metering pump calibrated for 10 gallons per minute (GPM) at 50 PSI might drop to 8 GPM when pressure jumps to 60 PSI, and climb back to 11 GPM when pressure dips. For most water treatment applications, that 20% swing in chemical dose can throw off pH levels, or lead to over-dosing chlorine which is a waste of chemicals and can damage pipe liners. I\u2019ve had customers call me in a panic after a week where over-dosing corrosion inhibitor led to 3 failed pipe segments\u2014costing tens of thousands in repairs\u2014all because they didn\u2019t account for back pressure variability in their process.<\/p>\n

Maintenance is another area where metering pumps fall short, especially compared to simpler centrifugal pumps. Centrifugal pumps have far fewer moving parts, and most routine checks just involve monitoring motor vibration and impeller condition. Metering pumps, though, have delicate components: diaphragms, check valves, seal rings, and stroke adjustment gears. The diaphragm, in particular, takes a beating. Every stroke flexes it, and if you\u2019re dosing abrasive fluids (like sand-laden waste water, or pigment slurries), the diaphragm can wear out in as little as 1,000 operating hours. That might sound manageable, but if your process runs 24\/7, that\u2019s a diaphragm change every 6 weeks. And here\u2019s the catch: most of these components aren\u2019t cheap. A standard PTFE diaphragm for a 2-inch metering pump can cost $150, and check valve kits add another $80. Multiply that by 2 pumps for a medium-sized operation, and you\u2019re looking at $2,000 a year just for wear parts, not including labor to replace them. I\u2019ve had a pharmaceutical client tell me they switched from metering pumps to a different dosing system because the annual maintenance cost was 15% of their pump\u2019s original price tag\u2014a cost they couldn\u2019t justify when they were already operating on thin margins.<\/p>\n

Don\u2019t even get me started on the calibration headaches. Metering pumps rely on precise alignment to deliver accurate flow, and even a tiny shift in the stroke length or check valve position can throw off dosing. I once had a customer who worked in a biotech lab, dosing reagents for a new drug trial. They calibrated their pump to 0.5 milliliters per stroke, but after a month of continuous operation, the stroke gear wore 0.1 millimeters off, making their dose 20% too high. The trial results were invalid, and they had to restart the entire 6-month trial, costing over $50,000 in research and labor. Calibration isn\u2019t a one-and-done task, either. Most manufacturers recommend calibrating metering pumps every 3 to 6 months, depending on use. For operations that run 24\/7, that means stopping production every quarter to pull the pump off the line, calibrate it, and put it back. For high-volume plants, each calibration can take 4 to 8 hours\u2014time that adds up to lost production, which is often far more expensive than the calibration service itself.<\/p>\n

Another disadvantage many people overlook is their limited flow range flexibility. Unlike centrifugal pumps, which can adjust flow rate by changing motor speed or impeller size, metering pumps have a fairly narrow effective flow range. Most standard metering pumps can only adjust flow between 10% and 100% of their rated capacity, and trying to go below 10% can lead to inconsistent dosing because the stroke becomes too short to create a proper seal on the check valve. That\u2019s a problem for applications that have varying demand: for example, a chemical plant that only needs to dose 5 GPM one month, and 30 GPM the next when production ramps up. If you buy a pump rated for 30 GPM, you can\u2019t easily adjust it to run at 5 GPM without losing accuracy. I\u2019ve seen customers try to force the issue by modifying the stroke mechanism, which usually leads to premature component failure and a pump that\u2019s out of warranty. In contrast, a centrifugal pump can handle that range easily, making it a better fit for variable load applications\u2014even if it\u2019s not as precise at fixed flow rates.<\/p>\n

Corrosive fluids are another hidden risk with metering pumps. While many pumps are made of PTFE or stainless steel, cheaper models often use brass or aluminum components that can\u2019t stand up to strong acids or bases. If you\u2019re dosing sulfuric acid at a chemical plant, a pump with brass check valves will corrode in a matter of weeks, leading to leaks and failed dosing. Even stainless steel pumps can have issues if the fluid has abrasive particles mixed in, which can scratch internal surfaces and create gaps where flow can leak, reducing accuracy. I once had a customer in a mining operation who bought a low-cost metering pump for dosing flocculant into tailings water. The pump\u2019s plastic body didn\u2019t hold up to the abrasive silt in the water, and within a month, leaks were pouring out around the shaft seal. They had to shut down their tailings system for 12 hours to replace the pump, costing them over $20,000 in lost mining output\u2014all because they tried to save a few hundred dollars on a pump that wasn\u2019t rated for their corrosive, abrasive fluid.<\/p>\n

Wait, let\u2019s also talk about noise. A lot of industrial settings don\u2019t prioritize pump noise, but OSHA has strict limits for workplace exposure, and high noise levels can lead to worker fatigue or hearing damage. Metering pumps, especially piston-driven models, can be far louder than centrifugal pumps. A standard piston metering pump can generate 85 to 90 decibels (dB) of noise\u2014about as loud as a lawnmower\u2014while a centrifugal pump of the same capacity is often 10 to 15 dB quieter. For workers who are in the pump room all shift, that difference adds up. I\u2019ve had multiple customers tell me they had to install sound-dampening enclosures around their metering pumps, which added 10 to 15% to the total cost of their system. Some also had to provide hearing protection for their workers, an ongoing expense that many don\u2019t budget for when they first purchase a metering pump.<\/p>\n

Now, it\u2019s important to note that I\u2019m not here to bash metering pumps\u2014they\u2019re still the best option for many precision dosing applications, like pharmaceutical manufacturing or small-batch food processing. But as a supplier, I owe it to my customers to be transparent about their downsides, so they can make the right choice for their operation. The key is to mitigate these disadvantages by doing your homework: make sure the pump is compatible with your fluid\u2019s viscosity, abrasiveness, and chemical makeup; account for back pressure fluctuations in your process; budget for regular maintenance and calibration; and buy a model that has enough flow range flexibility for your current and future needs.<\/p>\n

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If you\u2019re in the market for a metering pump, and you want to avoid the headaches I\u2019ve seen so many customers deal with, reach out to our team to discuss your specific application. We\u2019ll help you choose a model that\u2019s tailored to your fluid, process, and budget, so you get the precision you need without the costly downtime or maintenance surprises.<\/p>\n

Single Screw Pump<\/a> References:<\/p>\n

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  1. American Society of Mechanical Engineers. (2021). Positive Displacement Pump Performance and Application Guidelines. ASME Press.<\/li>\n
  2. Occupational Safety and Health Administration. (2022). Noise Exposure Standards for Industrial Workplaces. OSHA Technical Manual.<\/li>\n
  3. Fluid Handling Industry Association. (2020). Metering Pump Maintenance Best Practices for Industrial Applications. FHI Technical Report Series.<\/li>\n
  4. Smith, J. (2019). Fluid Compatibility for Industrial Pumping Systems. Journal of Industrial Fluid Handling, 45(3), 112-127.<\/li>\n
  5. Water Environment Federation. (2021). Chemical Dosing Systems for Municipal Wastewater Treatment. WEF Practice Manual.<\/li>\n<\/ol>\n
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    Zhejiang Yonjou Technology Co., Ltd.<\/a>
    Zhejiang Yonjou Technology Co., Ltd. is known as one of the most professional metering pump manufacturers and suppliers in China, with more than 30 years’ experience. Please feel free to buy high quality metering pump for sale here from our factory. For price consultation, contact us.
    Address: No.780, Oubei Road, Yongjia County, Wenzhou City, Zhejiang Province, China
    E-mail: sales@yonjou.com
    WebSite:     https:\/\/www.yonjoupump.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    If you\u2019ve spent any time in industrial fluid handling, you know metering pumps are the go-to … What are the disadvantages of using a metering pump?<\/span>Read more<\/a><\/p>\n","protected":false},"author":60,"featured_media":3583,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3546],"class_list":["post-3583","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-metering-pump-43e2-60edba"],"_links":{"self":[{"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/posts\/3583","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/users\/60"}],"replies":[{"embeddable":true,"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/comments?post=3583"}],"version-history":[{"count":0,"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/posts\/3583\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/posts\/3583"}],"wp:attachment":[{"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/media?parent=3583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/categories?post=3583"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.votonmachinery.com\/blog\/wp-json\/wp\/v2\/tags?post=3583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}