As the pioneer of surge control methods of pressure transient, PULSCO has developed a substantial history of proven performance since first installed in 1922. Our experience and expertise has expanded into the design of complete systems that solve an array of fluid transmission and delivery challenges. PULSCO works with its customers to determine the best system to meet their needs, evaluating the most dependable, safest and cost efficient methods for surge suppression, pressure control, and much more. 

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The first step in finding a fluid control solution is understanding the problem.

Often times users are not sure of the problems inherent in their fluid transport systems. Hydropneumatic systems PULSCO regularly designs include:


Next is determining which control system is best-suited for your protection.


PULSCO takes into consideration the specific project needs before recommending one system over the other. In direct contrast, some manufacturers recommend only bladder systems or only air-over-water systems, often citing misinformation as fact, and usually promoting a narrow view.



Can be designed for any volume

Air-Over-Water systems can be designed for any volume, where the tank size limited only by shipping restrictions and site limitations. The air compressor provides a local source of compressed air to recharge the tank when needed. The system is controlled automatically using a controller and other system components.

Monitoring equipment recommended

Air-Over-Water systems appurtenances and controls automatically adjust the level to keep it in the intended range, making the system more resistant to the effect of small leaks in valves, or joint connections.

Routine Maintenance

The air compressor and instrumentation needs to be maintained in good condition, and the solenoid valves should be activated periodically. Typical maintenance on the Air-Over-Water equipment can be performed without isolating the tank.


Better suited for smaller spaces

Bladder systems are recommended for smaller tank volumes or at sites that have limited access to power or onsite maintenance personnel. A flexible bladder membrane maintains the separation of gas and fluid, preventing gas from being absorbed into the fluid. 

Monitoring equipment recommended

While not necessarily required, it is recommended that monitoring instrumentation be installed to improve maintenance and assist in troubleshooting. It is important to confirm adequate volume of air is in the tank to protect the system. 

Routine Maintenance

Bladder systems have fewer components to install and maintain. Once the system has been confirmed to be running properly, minimal human interaction is required for operation. Tanks must be isolated during bladder changes.


Next is understanding the materials that are best-suited for reliability.

PULSCO selects materials based on code and regulatory requirements, assuring optimum performance for the specific application and environment. 


Size Range


Oil & Gas, Wastewater, Potable Water, Low Temperature, Ammonia

Carbon Steel, Stainless Steel, Titanium, Brass, Lead Free


Lastly, understanding the determining factors of the cost of ownership 

A PULSCO-designed Hydropneumatic control system will protect the capital equipment, save your system manpower, and save money in the long run 

The cost of a system is dictated by the size and pressure rating of the tank by the operating pressure of the system, and by the instrumentation and controls chosen. Generally speaking and assuming proper skill set of operators and maintenance personnel, cost of ownership may favor Bladder systems for volumes up to 2000 gallon, and favor Air-Over-Water systems for volumes over 6000 gallons.


Direct Costs



Indirect Savings

The benefits from having an optimally designed system are considered indirect savings.

Failure Prevention

Reduced System Downtime

Reduced System Maintenance 


Find a Hydropneumatic Control System representative in your area.

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