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Metering Pumps Overview
The technology used to produce metering pumps has barely changed in over a generation. As a result, conventional metering pumps have operational limitations and greater cost consequences. Hydra-Cell is not a conventional metering pump. Hydra-Cell Metering Solutions pumps enable you to meet and, in most cases, exceed API 675 performance standards with virtually pulse-less, linear flow while providing many other operational benefits. Taking advantage of the most current technologies, Hydra-Cell P Series metering pumps achieve superior levels of accuracy, repeatability and linearity, while delivering precise, constant flow.This revolution in metering employs the latest available means of electronic flow control to replace antiquated, inaccurate stroke adjusters.
To maintain accuracy in a hydraulically-actuated metering pump, the volume of oil on the non-process side of the diaphragm must remain constant.
Conventional metering pumps rely on vacuum sensing or mechanical activation to compensate for leakage past the plunger. They may not compensate on every pump stroke.
Hydra-Cell pumps incorporate a replenishment valve in every piston assembly. This ensures optimum actuating oil volume on every diaphragm stroke to provide superior accuracy that exceeds the performance demands of API 675.
Accuracy
Accurate, Reliable Electronic Flow Control
Unlike metering pumps that use manual stroke adjusters, Hydra-Cell P Series metering pumps use Variable Frequency Drive (VFD) electronic flow adjustment to maintain greater accuracy over the entire turndown range. This reduces the possibility of operator error, pumping inaccuracies, lost motion, and chance of leakage.
- Solid-state electronics are unlikely to fail
- Metering is linear over the entire range
- Volume per stroke is constant and a known value
- Easy calibration of the desired feed rate
- Rate of change is virtually instaneous (0 to maximum rpm in 0.3 seconds) with AC motor
Achieve Economy through Technology
Hydra-Cell metering pumps combine simple, elegant engineering with rugged construction to offer greater versatility while lowering overall costs.
- Smaller footprint with the same capability as larger pumps lowers acquisition costs and saves valuable space in the facility
- Each model covers an extensive range of pressures and flows - no need for different plunger and liquid end sizes to accommodate increases
- Inherent simplicity of the Hydra-Cell design allows versatile application compared to complex metering pumps that may require expensive construction changes to meet specific needs
- Lower parts and maintenance costs
- Separate gearbox makes it easy to change applications while preventing cross-contamination of actuating oil
- Multiplexing capability enables mixing ratios of multiple fluids in flexible, economical ways
Choice
Greater Choice of Materials Enhances Capability
Some metering pump manufacturers offer only PTFE diaphragms, which require more frequent and costly replacement due to stress and low processing temperatures.
Hydra-Cell metering pumps can be equipped with a variety of diaphragm materials (FKM, Buna-N, EPDM, Neoprene,Aflas, and PTFE).This enables Hydra-Cell metering pumps to operate over a wider range of processing applications.
In addition, several Hydra-Cell metering pump packages are available with special materials such as Hastelloy C and PVDF. Other metering pumps apply substantial price adders for exotic liquid end materials.
Compared to conventional metering pumps operating under the same conditions at the same flow and pressure, Hydra-Cell metering pumps provide smooth, almost pulse-less performance. This allows for the design of a safer, less expensive metering pump system and for use in more accurate applications, such as spraying which cannot tolerate pulsing flow.
Oil
Mesamoll Oil
Mesamoll oil offers outstanding gelling capacity and high saponification resistance along with good dielectric properties and resistance to weathering and light. It is ideal for use with many types of polymers and in instances where it will come into contact with water or an alkali. For information about ordering Hydra-Cell pumps with Mesamoll Oil, contact the factory.
Pulsation
Reduced Pulsations Improve Operation
Pulsing, surging flow from traditional metering pumps can produce greater strain on the system and more wear and tear on the pump. Hydra-Cell features a multiple-diaphragm design (except model P100) that practically eliminates pulsations.
- Reduces pipe strain
- Enhances operating safety
- Minimizes maintenance
- Reduces friction and acceleration losses in the suction line
- Eliminates the need for pulsation dampeners
- Provides accurate metering with linear, constant flow
- Lowers system acquisition costs
The multiple-diaphragm design of Hydra-Cell metering pumps provides virtually pulse-less, linear flow without the need for expensive pulsation dampeners.
“If the owner of a plant wants cost- effective pumps... he will buy pumps with the lowest Life Cycle Cost. Hydra-Cell is simple in construction, less elaborate in design and physically smaller for equivalent flow/pressure performance. These differences can substantially affect both purchase and operating costs.”
Dr. Ing Friedrich Wilhelm Hennecke, Chemical Engineering World