From Fluid Handling

When it comes to measuring high-purity fluids, not all flowmeters are created equal. In addition to the accuracy, repeatability and reliable operation that is required of any flowmeter, the device must be designed and constructed so as to prevent contamination of both the fluid itself, and the process or product in which it is used. Just as for other essential elements in the flow loop - valves (Chem. Eng., June 2001, pp. 107-111) and pumps (Chem. Eng., April, pp. 87-89), along with control algorithms and loop tuning - certain specifications and standards must be met.

For producers of food and beverages, pharmaceuticals and biotechnology-derived products, the objective in maintaining a clean process environment is to prevent the growth and spread of organic matter, such as harmful bacteria, that can contaminate products or threaten human health. Semiconductor fabricators, on the other hand, who require water and chemicals so pure that some contaminants have to be removed to parts-per-billion levels, are primarily concerned with inorganic constituents that can lower chip yield. The specific flowmeter requirements for semiconductor production will be discussed in a future article.

Throughout the chemical process industries (CPI), flowmeter performance attributes, such as accuracy, repeatability...

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Products & Services
Peristaltic Pumps
Peristaltic pumps use rotating rollers pressed against special flexible tubing to create a pressurized flow.
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

Next time you want to measure flow, think of the rotameter first. This simple and economical means of flow control, with local readout, for a wide variety of gases and liquids of low-to-moderate...

The selection of six types of flowmeters was previously discussed here (previous article, pp 176- 182, in this book). These were: variable-area, mass, Coriolis, differential-pressure, turbine, and...

By Vince Salupo, Eli Lilly & Co. and Franki Parson, Emerson Process Management, Micro Motion Division This article provides discussion and suggestions on the role of Coriolis flowmeters in...

The miles of piping found in chemical process and utility areas are visible evidence of the importance of moving fluids safely and efficiently in the ongoing quest to improve unit operations. The...

Flow Transmitters Flow is measured by a number of different methods. This section will cover flow measurement made using the following types of flowmeters: Differential Pressure Magnetic Mass Flow...

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