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Items 1→37 of 37. Page 1 of 1.
- B-GAP look up translate image
- The radial gap between the impeller vanes and the volute tongue or diffuser vanes. Careful attention to this gap can keep vibrations down.
- B.E.P. look up translate image
- Best Efficiency Point. The kinetic energy that a pump produces is never converted with 100% efficiency to pressure energy. There are always losses due to friction in the seals/bearings, friction of the pumped fluid over the impeller, etc. The BEP is thevolumetric flow rate of the pump for which the pump was designed to convert the most kinetic energy into pressure energy.
The best efficiency point. It is the point where the power coming out of the pump (water horsepower) is the closest to the power...(more)
- B.H.P. look up translate image
- Brake horsepower. The measure of an engine’s horsepower before the loss in power caused by any load (gearbox, etc.). Measured by attaching a “De Prony brake” to the engine’s shaft.
Brake horsepower. The actual amount of horsepower being consumed by the pump as measured on a pony brake or dynamometer.
- BA look up translate image
- The width of the impeller in a pump. Commonly measured from the OD of the impeller excluding the width of the impeller walls. This measure is proportional to pump capacity.
- BACK PLATE look up translate image
- Used in some centrifugal pumps. The back plate consists of a gland ring facing the bearing side where the mechanical seal or gland packings are arranged in such a way that the pumped fluid cannot leak. The other side of the back plate is situated towards the impeller and becomes one of the wall between the suction casing.
Used in some centrifugal pumps to position the stuffing box and provide an impeller wear surface.
- BACK PULL OUT PUMP look up translate image
- A pump design that allows the entire power end of the pump to be removed for maintenance/replacement while the wetend of the pump remains in place.
A design that allows the wet end of the pump to be left on the piping when the power end and adapter are removed. A.N.S.I. pumps are designed this way.
- BACK TO BACK DOUBLE SEAL look up translate image
- A mechanical seal configuration typically used when the process fluid is toxic, flammable, or hazardous. This seal is used to prevent the process fluid or its vapour from leaking into the environment.
The rotating seal faces are facing in opposite directions. The worst possible configuration. In the past this term was used to describe a higher barrier fluid pressure between dual mechanical seals.
- BACK VANE look up translate image
- Part of the design scheme in impellers used to balance axial thrust on an impeller.
- BACK-TO-BACK look up translate image
- In the case of impellers, an arrangement where two impellers are placed back to back on a single shaft sharing the same backplate. This arrangement provides almost double the flow of a single impeller design.
- BAD ACTOR PUMP look up translate image
- A pump that fails more frequently than it should based on its MTBF (Mean Time Between Failure).This pump is the type of pump that is ripe for replacement or overhaul.
- BALANCE HOLES look up translate image
- Another impeller feature that helps to balance axial thrust.
- BALANCE RATIO look up translate image
- The standard balance ratio is 70-30 used by most mechanical seal companies. This means that 70% of the seal face area is exposed to the hydraulic closing force, while 30% is not.
A 70/30-balance ratio means that 70% of the seal face closing area is seeing the stuffing box pressure and 30% is not seeing the pressure.
- BALANCED SEAL look up translate image
- The most effective tool to counter heat generation in the stuffing box. The area of the seal face is reduced (i.e. balanced) to reduce the heat generation between the two faces of the seal.
A design in which the seal face closing area is reduced to lower the closing force, and reduce the heat generation between the faces.
- BALL BEARING look up translate image
- A bearing that uses balls to maintain the separation between the bearing faces.
Consists of an inner race, an outer race, and a series of balls between them. Often called a precision or anti friction bearing.
- BALL SHUTTLING look up translate image
- A situation where the balls in a ball bearing rotate perpendicular to their rolling axis. This can result in premature failure of the bearing by accelerating the microscopic wear. This can be seen as an appearance of a polished raceway.
- BAR look up translate image
- Non-SI unit of pressure. Exactly equal to 100,000 Pa. About equal to the atmospheric pressure at sea level.
Metric term for one atmosphere of pressure.
- BAROMETRIC PRESSURE look up translate image
- Another term for atmospheric pressure. Often used in weather reports.
- BARREL PUMP look up translate image
- A pump used to transfer fluid from a barrel.
- BARRIER FLUID look up translate image
- The high-pressure fluid that is circulated between two mechanical seals. The fluid should enter the bottom and leave the top to prevent air pockets.
- BARRIER FLUID/LIQUID look up translate image
- The fluid used between the two mechanical seals of a double seal. Used to isolate the process fluid from the atmosphere. Also known as buffer fluid.
- BASE CIRCLE look up translate image
- A reference circle in a volute design that is used as a basis calculating the cutwater diameter. In most cases, the base circle diameter corresponds to the maximum impeller diameter.
- BASE PLATE look up translate image
- The plate on which the pump and motor are mounted.
The pump and motor mount on this unit. The pump and motor feet closest to the coupling should be doweled to the base plate.
- BAYONET look up translate image
- The mechanical seal drive lugs wear into the drive slots and prevent the seal faces from moving forward to compensate for wear.
- BEARING look up translate image
- A machine element that one part to support (i.e. bear) another. They constrain relative motion between moving parts to only the desired motion (e.g. rotation around an axis).
Supports the rotating shaft and allows it to turn with a minimum amount of friction. Could be either sleeve or anti-friction type
- BELLOWS look up translate image
- Part of the design in a mechanical seal that prevents the build up of deposits on dynamic gaskets.
Can be manufactured from metal or non-metallic materials to eliminate flexing, rolling or sliding elastomers in mechanical seal designs.
- BELLOWS PLATE look up translate image
- Metal bellows in mechanical seals contain thin stamped plates welded together to form a convolution. Each of these plates is known as a bellows plate.
- BELT DRIVE look up translate image
- A series of belts and pulleys that transfer the torque from a drive shaft to the required shaft at the correct speed.
- BERNOULLI'S LAW look up translate image
- Describes the behavior of fluid under varying conditions of flow and height. Formulated by Daniel Bernoulli in 1738.
A moving stream of liquid or gas exerts less sideways pressure than if it were at rest. The result is that things seem to be drawn into the stream, but the higher pressure from outside is really pushing them in.
- BINGHAM PLASTIC look up translate image
- A material that behaves as a rigid body at low stress, but flows as a viscous fluid at high stress.Mayonnaise and toothpaste are common examples of this type of material.
- BODY BOUND BOLTS look up translate image
- A bolt/bolt hole configuration where there is an interference between the bolt and its mating hole.
- BOURDON PRESSURE GAUGE look up translate image
- The Bourdon tube is a sealed tube that changes shape in response to applied pressure, causing an attached indicator to reflect a pressure change. This is the most common pressure sensing gauge in use.
- BOWL (VERTICAL TURBINE PUMP) look up translate image
- In multi-stage vertical turbine pumps, the bowl is the casing of one of the stages.
- BRINNELL HARDNESS look up translate image
- A scale for measuring hardness of materials. It uses an indenter to penetrate the material using a certain force, and characterizes the indentation made.
A method of measuring the hardness of metal parts and hard seal faces. Above 350 the standard machining operations of turning, boring, drilling, and tapping become uneconomical.
- BUFFER FLUID look up translate image
- The fluid used between the two mechanical seals of a double seal (see barrier fluid).
The low pressure fluid that is circulated between dual mechanical seals.
- BUNA N look up translate image
- Commonly known as Nitrile rubber. It is a synthetic rubber that is a copolymer between acrylonitrile and butadiene.
Some times called Nitrile. A common elastomer used in the sealing of oil or water. Sensitive to Ozone attack and therefore has a short shelf life.
- BUSHING look up translate image
- An independent plain bearing that is inserted into a housing to provide a bearing surface. For use in rotary applications.
A close fitting support device used to restrict flow between two liquids, thermally isolate a hot liquid, support the rotating shaft, break down pressure etc. Commonly made of carbon or Teflon.
- BYPASS LINE look up translate image
- A design that bypasses a portion of the pump system. This can be from the discharge to the stuffing box, the stuffing box to the pump suction or the pump discharge to any lower pressure point in the system.
Used to either re-circulate fluid from the pump discharge to the stuffing box, the stuffing box to the pump suction, or the pump discharge to a lower pressure point in the system.
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