A roughing pump is any vacuum pump (typically mechanical) used to initially evacuate a vacuum system, as a first stage towards achieving high vacuum or ultra high vacuum. The term "roughing pump" derives from the vacuum range it works in, "rough vacuum", above 1x10−3 torr (0.1 Pa). Pumps that operate in the high vacuum ranges typically don't operate, or only operate inefficiently, at atmospheric pressures, whereas pumps that work efficiently at atmospheric pressure usually cannot produce a vacuum lower than approximately 1x10−3 torr.
One consideration for choosing a roughing pump is whether the pump uses lubricating oil that's exposed to the vacuum. This concern of "hydrocarbon backstreaming" where pump oil as a gas makes its way into the vacuum chamber, has led to oil-free pump designs on the market.
has led to oil-free pump designs on the market. Two main types of roughingpumps are oil-sealed roughingpumps and dry roughingpumps. Within the two categories...
to a mechanical backing pump (usually called roughingpump) that produces a pressure low enough for the turbomolecular pump to work efficiently. Typically...
effectively pump hydrogen, helium and neon, all gases with lower condensation temperature than liquid nitrogen. The main application is as a roughingpump for...
may be heated to for regeneration. Sorption pumps are a type of cryopump that is often used as roughingpumps to reduce pressures from the range of atmospheric...
maintained by a series of pumps. The first stage is usually based on a roughingpump, most commonly a standard rotary vane pump. This removes most of the...
ability to move on rough terrain outside the runway and airport area, large water capacity as well as a foam tank, a high-capacity pump, and water/foam monitors...
vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented...
chain of two or more different kinds of vacuum pumps may be used in a vacuum system, with one "roughing" pump removing most of the mass of air from the system...
A pallet jack, also known as a pallet truck or pallet pump, is a tool used to lift and move pallets. Pallet jacks are the most basic form of a forklift...
traditional pump includes: the pump (including controls, processing module, and batteries) a disposable reservoir for insulin (inside the pump) a disposable...
A hydraulic ram pump, ram pump, or hydram is a cyclic water pump powered by hydropower. It takes in water at one "hydraulic head" (pressure) and flow rate...
Nakasako M, Nomura H, Ogawa H (June 2000). "Crystal structure of the calcium pump of sarcoplasmic reticulum at 2.6 A resolution". Nature. 405 (6787): 647–55...
Retrieved 2016-03-04. "Huacachina lagoon level drops sharply due to well pump failure". Peruvian Times. 2008. "Peru This Week: Water level in Huacahina...
separate (rhodium/platinum) catalyst which reduced NOx ahead of the air pump, after which a two-way catalytic converter (palladium/platinum) removed HC...
subsidiaries: Concrete Pump division, based in Changsha, includes the truck-mounted concrete pumps, stationary concrete pumps, concrete mixers, concrete...
principal source of drinking water, and the remains of the old system, pumped into lower levels of the same reservoirs, were from then on used for the...
Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited...
time since its startup in 1985. In response, backup generators and coolant pumps for reactor 5 started up, and reactor 6 reduced generation. Incoming power...
musician and working as a commercial jingle writer. After Foster's song "Pumped Up Kicks" became a viral success in 2010, the group received a record deal...
pressure hydraulic assistance. A belt driven 7-piston pump, similar in size to a power steering pump, generates this pressure when the engine is running...
Kylie Minogue and Lady Gaga, and also produced many mainstream hits such as "Pump Up the Jam" by Technotronic, "French Kiss" by Lil Louis, "Show Me Love" by...
married Michelle's mother, Marian Shields, on October 27, 1960. Robinson was a pump worker at the City of Chicago water plant. Craig Robinson, Michelle Obama's...
sewers. It encompasses components such as receiving drains, manholes, pumping stations, storm overflows, and screening chambers of the combined sewer...
approximately 23 inches (580 mm). Meanwhile, Harris's Savage-Springfield 12-gauge pump shotgun was sawn off to around 26 inches (660 mm). The shooters also possessed...
The Remington Model 870 is a pump-action shotgun manufactured by Remington Arms Company, LLC. It is widely used by the public for shooting sports, hunting...
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