Dry vacuum venting at a better price. (Compounding).Dry rotary-screw vacuum pumps Vacuum pump A device that reduces the pressure of a gas (usually air) in a container. When gas in a closed container is lowered from atmospheric pressure, the operation constitutes an increase in vacuum in this container. cost more than twice as much as conventional liquid-ring pumps. Nevertheless, several years ago some compounders began putting dry pumps on their twin-screw twin-screw adj. Nautical Having two propellers, one on either side of the keel, that usually revolve in opposite directions. compounding lines for environmental reasons. But now compounders can get the same environmental benefits a lower cost. According to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. sources at pump maker Busch Inc. in Virginia Beach Virginia Beach, resort city (1990 pop. 393,069), independent and in no county, SE Va., on the Atlantic coast; inc. 1906. In 1963, Princess Anne co. and the former small town of Virginia Beach were merged, giving the present city an area of 302 sq mi (782 sq km). , Va., dry vacuum pumps (like Busch's Cobra model shown here) vent VOCs from the extruder as gas rather than putting them into the plant's waste water as a liquid-ring pump does. In the past few months, Busch has begun modifying its lower-priced Mink rotary-claw dry-vacuum pumps for compounders. Mink pumps, which pull up to 27 in. of vacuum, cost only 50% more than liquid-ring pumps. Mink and Cobra pumps have similar pumping capacity of about 500 cfm. Tel: (757) 463-7800, www.buschpump.com |
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