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The rugged, non contacting design includes the ability to control pump case and internal gas temperatures allowing a comprehensive range of solvents, flammables and corrosives to be pumped and systemized variants to address the EU's explosive atmospheres (ATEX) directive for Category 1 (Zone 0) T4 operation.
The mechanism can tolerate liquids and particles in the gas stream and is suited to many applications, including:
• Distillation
• Evaporation
• Filter/driers
• Solvent recovery
• Reactor service
• House/central vacuum
The product range is available from 80m3h-1 / 47 ft3min-1 to 400 m3h-1 / 235 ft3min-1 with capacity expandable to 3000m3h-1 / 1766 ft3min-1 and an ultimate pressure of 10-2mbar / 0.015 Torr. Applications Engineering is a core competence and BOC Edwards are able to offer a comprehensive solutions package that includes
• Process design
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• Safety and operating procedures
• Vacuum system and control integration
• Commissioning advice
Dry technology
Dry running pumps have no oil, steam or water in the process volume. This eliminates, at source, the pollution traditionally associated with wet sealed vacuum systems and provides cost and materials handling benefits as the sealing medium does not have to be replenished:
• NO contamination of the process stream
• NO polluted effluent
• NO messy oil drums
• Improved processing with reduced down time
• Low utility and consumable costs
Patented technology, proven design
BOC Edwards DP and EDP range are designed specifically for harsh chemical environments.
• Vertical orientation
- allows condensates to drain
- can handle liquid slugs
• A torque limiting clutch (can be reset) protects against hydraulic lock
• Indirect cooling circuit allows variable and controllable case temperatures
• Shortest gas paths prevent local condensation and particulate build up
• Suitable for outdoor installations
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| CHEMICAL DRY PUMPING SYSTEMS |
DP/DPS80 - DP/DPS400 (PDF FILE Página 5)
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EDP60 - EDP300 (PDF FILE Página 5) |
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ATEX SYSTEMS
(Europe only)*
Safety has long been an issue in industries & applications where potentially
explosive atmospheres exist and the chemical and pharmaceutical sector
is no exception.
ATEX requires pump manufacturers to consider ‘malfunctions’ (Category 2/Zone 1) and where pumping-continuously in the flammable zone, 'rare malfunctions' (Category I/Zone 0). How to prevent ignition by pumping outside the flammable range (controlling concentrations, temperature and speed) and containing internal explosions or sustained bums (flame arrestors) have been understood for many years, indeed flame arrestors make use of the same principle as the Davy Lamp. What the vacuum pump industry has been wrestling with is how to guarantee safety without loss of performance.
BOC Edwards dry claw pumps offer a breakthrough. The unique design of the dry
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claw pump mechanism creates turbulence, ensuring that no gas or solvent is in contact with the internal surfaces long enough to cause a hazard. For Zone 1 systems this means the BOC Edwards dry claw is able to pump T4** solvents and gases, at full speed, without compromising on safety or the risk of corrosive internal condensation. In the event of ignition, flame arrestors with integral sensors linked to central control system initiate protective action and provide endurance burnprotection for up to two minutes.
Benefits:
• Independent certification by external test house.
• Zone 0 package can operate continuously in the flammable range.
• No need for frequency inverters (to control speed) in Zone 1.
• No inert gases - dilution of hazardous materials - cooling gas for rotors.
• Indirect cooling as standard - no addition of coolant devices to the pump itself.
• No gas coolers.
• Lower capital and running costs. |
*CD250 dry pump
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BOC EDWARDS CHEM-DRY™ VACUUM
PUMPS
Your Alternative for Efficient, Non-Contaminating Process Pumping
CD Chem-Dry™ series
Our CD Series dry pump operates much like a vacuum blower, with three pumping stages. Gas transfers from one phase to the next through external piping and intercoolers. This gas transfer principle permits cooling, condensing, and clean recovery of process condensables through a receiver system.
The CD dry pump can operate reliably from atmospheric pressure to blank-off because of its built-in backflow cooling arrangement. Unlike most pumps, the Chem-Dry™ pump has a flat horsepower curve. |
*CDE120 dry pump
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Chem-Dry Eagle™ series
The Chem-Dry Eagle™ series is based on the same operating principle of the CD Series. The Chem-Dry Eagle™ series replaced the CD's external interstage piping and coolers in favor of a compact cooling water jacket around the same tri-lobe roots-type blower design. The peripheral passages in the casing transfer most of the compressed gas between stages.
The outer wall of the peripheral gas passage is cooled by water circulating through a jacket. The gas in the peripheral gas passage prevents the chamberwalls from being directly cooled by water in the jacket. An important advantage, as compared to directly cooled designs, is that tight control of operating temperature is not needed to maintain correct thermal expansion. The temperature of the pump can then be adjusted for process requirements by controlling the water flow rate and temperature.
Boosted Chem-Dry™ vacuum systems
Generally without taking up one more inch of floor space, you can add capacity to your system by combining our Chem-Dry™ pump and our vacuum booster. In most sizes, the blower mounts above the pump. Standard systems are available with blower displacements up to 2000 ft3min-1 with an operating range of 760 Torr to 25 microns. Other combinations can be supplied with up to 50000 ft3min-1 displacement. BOC Edwards combination blower, dry pump systems are matched to take advantage of both the blower's and the dry pump's maximum performance. |
APPLICATIONS
• Vacuum distillation: Stripping and drying operations where solvents must be isolated and recovered untainted at very high yields.
• Pharmaceuticals & food: Chem-Dry™ pump provides both oil-free operation and clean, consistent
performance.
• Medical devices: Containment and recycling of ethylene oxide sterilants.
• Fatty acids:
Enhanced solvent recovery and elimination of water pollution and drain
blockage often experienced by steam ejector systems.
• Flavors & fragrances: Improved process economies through enhanced recovery of essential oils, aromatic hydrocarbons, and complex flavor concentration.
• Specialty gases: Pumping and recovery without oil contamination of SF6, xenon, tritium, etc.
• Polymer processing: Plastic extruding and similar operations where product or un-reacted monomers foul fluid-sealed pumps.
• Solid state reactors: Where process uptime and minimum maintenance is an advantage.
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Features & benefits
• Safety
Leak-tight pumping system uses no oil or sealing fluid to produce vacuum. Workers do not have to change or handle contaminated oil or other seal fluids.
• Reliability
Chem-Dry™ pumps have rugged, gear-driven pumping lobes that do not require spring-loaded vanes, oil metering pumps or plugged sealant lines, reducing failure modes.
• Clean effluent
Since the pump operates sealant-free, the chance of contamination of the cooling or seal fluid with the process gases is eliminated. Also, there's no possibility of carryover of the cooling fluid to the pump exhaust.
• Solvent recovery
The CD's built-in inter- and after-condensers and the Chem-Dry Eagle™ Series compact design both result in clean solvent recovery and reduced vapor phase emissions.
• Wide operating range
Pump operates from atmosphere to a base pressure of 3 to 0.6 Torr. Tri-lobed design permits stable performance at any inlet pressure from atmospheric to blank-off.
• Low-level operation
Chem-Dry™ intercondenser drain tanks allow the pump to operate at ground level without the need for a hot well or special drain pumps for condensate.
• Handles liquids
Can accommodate up to 1/4 gal min-1 slugs of liquid on a continuous basis and can handle process liquid upsets without need for costly rebuilds.
• Low maintenance
The pump is designed for continuous, unattended operation with infrequent maintenance.
• Can run dead headed
The BOC Edwards Chem-Dry™ Pump is capable of operation with the inlet valve closed and is not damaged by process upsets. |
| Chem-Dry™ series vacuum pumps |
CD Chem-Dry™ series (PDF FILE Page 9)
Chem-Dry Eagle™ series (PDF FILE Page 10) |
