Let’s take a look at what exactly “pump failure” means.
To begin with, there is no clear definition of what constitutes a “failure” in a pump.
According to the Daijirin Third Edition dictionary, “koshō (故障)” means “a state in which a machine or body experiences a malfunction and can no longer operate smoothly.”
For example, if the packing of a diaphragm pump becomes worn and causes liquid leakage, would you call that a “failure”?
You might think, “No, that’s not a failure—it can be fixed just by replacing the packing.”
Then, how about a case where the pump doesn’t operate properly even though it’s installed correctly?
In that case, you’d probably think, “That’s not a failure, it’s just a defective product.”
What are consumable parts? — Tips for Long-Term Use
All pumps around the world have consumable parts. Each manufacturer sets its own recommended replacement intervals for these parts, and regular replacement is necessary to ensure long-term and proper operation.
Consumable parts typically include components such as packings, mechanical seals, and diaphragms – parts that are in sliding contact, exposed to liquid, or used for sealing. These parts are generally inexpensive and are designed so that users other than the manufacturer’s technicians can replace them easily.
When a pump has been used for a long time, it may also become necessary to replace driving components such as the motor, impeller, or coupling.
In many cases, replacement of these driving parts can only be handled by the manufacturer. Often, a complete overhaul is performed, including the replacement of packings and other consumables.
As a general guideline, the cost of an overhaul is about two-thirds of the price of a new pump.
Two-Thirds of New Price
Many people may think, “If you have to replace the motor, wouldn’t it be better to buy a new one?”
The key factor to consider here is cost.
At H2, we recommend purchasing a new unit if the repair cost exceeds two-thirds of the price of a new one.
You can download “Fluid Technology Magazine No.1: Why Do Pumps Fail?”, which provides a detailed explanation of pump failures, from the link below.
