BOOK_CONTENT
From Fluid Handling

Operators of equipment in the CPI and the offshore drilling industry are forced more and more to balance economy and ecology. No longer focusing on just investment costs, they now review in detail total energy consumption, availability, maintenance costs and environmental loads.

In the case of toxic, hazardous, corrosive or otherwise critical fluids, the best solution is leak-free transport. In many low-flow, high-pressure applications, diaphragm pumps offer an optimum solution. They have proven their safety and reliability in numerous installations.

What follows is an overview of the different types of diaphragm pumps, the pressure and delivery range and some applications. Successful operation requires knowledge of their function, their characteristics and their interaction with the associated piping.


Materials determine the range
Diaphragm pumps are best used for low-to-medium flow rates at medium to- high pressures. They have the three advantages of reciprocating displacement pumps, pressure firm characteristics (explained in Figure 1), high accuracy and high efficiency. They avoid a major disadvantage: they do not leak. All susceptible parts operate sealed from the fluid pumped except for the product valves.

It is important to distinguish between mechanical and hydraulic diaphragm drives. The mechanically actuated diaphragm is a pressure-bearing part that is limited...


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© 2014 Chemical Engineering

Products & Services
Double Diaphragm Pumps
Double diaphragm pumps are positive displacement pumps that compress fluid by decreasing the volume of a chamber containing the fluid.
Hand Pumps and Foot Pumps
Hand pumps and foot pumps are manually operated pumps that can driven by hand or foot via a handle or lever. 
Mechanical Vacuum Pumps and Systems
Mechanical vacuum pumps and systems contain devices such as pistons, claws, scrolling spirals, and diaphragms to isolate and compress air.
Condensate Pumps
Condensate pumps are used to collect and transport condensate back into a steam system for reheating and reuse, or to remove unwanted condensate from an HVAC or appliance collection pan.

Topics of Interest

Diaphragm metering pumps that are hydraulically rather than mechanically actuated offer numerous attractions. Their accuracy is high (typically around 1%), and they can operate leakfree even under...

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