Plant Management
Fig. 3. Hydraulically actuated diaphragm metering pump.
a wide operating range, including low speeds, and will accommodate the widest possible range of duties for all critical pressure processes. By employing low-maintenance reduction gears, energy consumption is reduced to the absolute minimum and almost silent operation is ensured.
Metering pumps are used for single point or multi-ingredient dosing throughout all areas of industry. Single point dosing typically involves the addition of a specific fluid accurately and in proportion on a continuous basis. Multiple liquid applications can be handled on a multi-head pump unit driven by a single motor, with the individual liquids metered independently to predetermined points in the process or brought together to create a blend. This application can involve a variety of fluids in any range of flows and proportions. Each of the fluid components is blended in correct proportions according to the recipe to obtain the desired mix.
Conclusion
steel and are capable of handling pressures of up to a 1000 bar and above. Users are advised to seek out pump head designs that incorporate a diaphragm failure indicator as this leak-free pump head design will continue to provide continuous service even in the event of one diaphragm failing (Fig. 3).
Challenging applications The options for high pressure transfer of hazardous fluids have traditionally been limited to reciprocating fixed stroke piston type positive displacement, high speed, or multi-stage centrifugal pumps. All these have their limitations, with respect to sealing, wear and consequent potential for leakage. The availability of a hydraulically actuated, double diaphragm pump capable of handling pressures up to 1000 bar with leak-free operation, is changing this situation. Process diaphragm pumps can provide a smooth product flow across
The changing requirements in process engineering are encouraging pump manufacturers to examine current technologies with a view to developing new techniques and materials. At the same time, there is a push for more economical and efficient dosing and proportioning systems. The market for dosing and proportioning is very diverse and the demands of each industry are different. However, drawing on the experience gained in one industry and applying it to another has proved to be highly effective in the system design process. Although the basic concept of a dosing and proportioning system is standard, the pump manufacturer knows how and where its components are customized for each application. The onus, therefore, lies with ensuring that all available data can be considered to facilitate well engineered selections and solutions. n
Steve Digby is with SPX Flow Technology, Brixworth, Northamptonshire, UK.
www.spx.com
Card reader modules P
roviding an operator with information and receiving operator feedback is central to many industrial processes, and a very wide range of products exist to satisfy this need in the marketplace. However, what do you do when your requirements become somewhat less mainstream?
Suppose you need a very durable product that can resist chemical attack from common solvents, is robust enough to take the odd knock and environmentally proofed to IP65 to survive outdoors, then your options become more limited. If your application demands hazardous area approvals due to the possible presence of flammable gases and vapours or flammable dust hazards, then your choices are significantly more limited.
Another important aspect in these remote 20
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installations is to know who the operator is and perform a validation before data entry is accepted and to satisfy these requirements Mercury IMC Ltd can provide an integral security card reader. A variety of different card reader modules are available that can read a Wiegand Swipe card or a range of RFID proximity cards including MIFARE, HID proximity cards and the EM marin card standards.
Mercury IMC also provide identical card readers for the standalone Sentry Card Reader, which is frequently used with the site access security system to control personnel and road tanker admission to a depot.
Mercury IMC was founded in November 2003 to be a specialist supplier of Data Entry & Processing equipment for use in hazardous and environmentally challenging locations.
Mercury IMC purchased the full rights and intellectual property from Emerson Process Management (Daniel Europe Division) for the Hazardous Area products, originally developed by Spectra-Tek UK Ltd. Mercury IMC now manufactures, markets and supports these products. It also provides a full repair and overhaul capability from the headquarters in Malton, North Yorkshire.
By focusing strongly on the Hazardous Area Products, Mercury IMC will be able to offer an enhanced service and take the products forward into the 21st century. n
Enter 20 or ✔ at
www.engineerlive.com/epe
Mercury IMC Limited is based in Malton, North Yorkshire, UK
www.mimc.co.uk
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