Knowledge Base

Hydrostatic Testing Pumps: What You Should Know

There are several types of hydrostatic testing pumps, and most of them are mounted on sturdy frames. The frames are made of aircraft aluminum, which is corrosion-resistant and durable. Many models have pneumatic wheels and garden hose inlets. They also often have shut-off valves and a damper diaphragm to prevent overpressure. In addition, most hydrostatic testing pumps come with a bypass valve for running the pump dry.


Hydrostatic water testing pumps are used to test water systems. These pumps are safer than air tests because they do not saturate plumbing lines with pressurized air. Always follow local pressure testing guidelines when using a hydrostatic test pump. It is essential never to overpressurize plumbing lines to avoid breaking PVC pipes. Hydrostatic pressure testing pumps also come with a built-in bypass valve. You can also buy a replacement seal kit to maintain the efficiency of your pump.

Choosing the right hydrostatic water testing pump can save you time. Generally, a higher GPM model can pressurize and fill water systems faster. A company such as Triple R Specialty notes that a pump rated for 2.0 GPM with a maximum pressure of 500 psi will take twice as long to complete the test as a pump rated for 4.5 GPM at 400 psi.

Colored Liquid

Hydrostatic testing pumps use a colored liquid to detect leaks. The colored liquid is more visible in water systems, making it easier to spot leaks. These pumps are compact, lightweight, and powerful. Some pumps use a separate gauge to measure system pressure. An electrical cord powers the test pump.

Hydrostatic testing pumps can be used to test water systems and other systems that use pressure. While all hydrostatic test pumps share some core features, they vary in portability, power, and control. Standard electric pumps are usually the most commonly used and provide enough power for most life safety applications. Electric pumps are also convenient because they do not produce fumes, which can be problematic in enclosed settings.

Pumps used for hydrostatic testing might be dry or filled with liquid. Dry models don’t need to be replenished and require minimal upkeep. They are usable in cooler climates.

Quick-Connect Couplings

Hydraulic quick-connect couplings allow quick connections to hydraulic, pneumatic, and compressed air lines. These couplings come in various sizes and can adapt to any stem, port, or pipe. Depending on the application, these couplings may have one or two valves and be made of rugged anodized aluminum or stainless steel. However, these couplings may have drawbacks, including the potential for cross-connection. The use of color-coded couplings can mitigate this.

Most hydrostatic testing pumps use a plunger or piston-type pumps designed to operate with pressurized water supplies. However, some systems use gravity feed for the positive flow. To use this pump, you must place the pump at a lower elevation than the water source and start the pump with the priming valve. This technique eliminates the need for a shaft, which makes for less maintenance and lighter overall weight.

Aluminum Pumps

Aluminum pumps for hydrostatic testing are available in various types. Some are lightweight and compact, while others have heavy components. Lightweight, compact models are helpful for testing pressures in confined spaces or remote locations. These pumps feature different pressure ranges, capacities, and flow rates. You can choose an aluminum pump that matches your specific testing requirements for your specific needs.

Some pumps are lightweight and easy to carry and are mounted on sturdy frames. These pumps are often made of aircraft aluminum, which is highly durable and corrosion-resistant. The pumps typically have pneumatic wheels for easy movement, a garden hose inlet, and a shut-off valve. Some models also have damper diaphragms to help prevent water from spilling into the reservoir. In addition, some models have a bypass valve for dry use.

Wetting Agent

Wetting agents are substances used to reduce water’s surface tension. The surface tension of water is high and can cause problems in many industrial processes. The high surface tension prevents water-based solutions from spreading out properly when applied to the surface. A wetting agent acts as a lubricant and makes these solutions spread.

Pumps that require hydrostatic testing must comply with NFPA and DOT safety requirements. The testing process ensures the integrity of a tank’s design, safety, and efficacy.