Term | Other Versions | Abbreviation / Acronym Sort descending | Classification | Definition |
---|---|---|---|---|
Rotor | Pump Part | The rotating assembly in a positive displacement pump, typically driven directly by the motor or other driver. |
||
Packing | Seal Type | Typically consists of braided or formed rings that are compressed in the stuffing box of the pump. As the packing is tightened, it squeezes up against the shaft and the stuffing box wall to create the seal. Click here to view the Pump Report on this topic. |
||
Maximum Allowable Inlet Pressure | Maximum Allowable Suction Pressure; MASP | Pressure Term | The maximum allowable difference between the absolute pressure of the fluid at the inlet port and the absolute ambient pressure. |
|
Lobe Pump | Pumping Principle | A type of rotary positive displacement pump consisting of a pair of externally timed rotors such that each is driven independently and the rotors are non-contacting. Rotor designs vary but some of the more common types include bi-wing (or scimitar), tri-lobe, and various multilobe designs. Similar in operation to a circumferential piston pump. Click here to view our How it Works video on this topic. |
||
U-Plus™ Bracket | Pump Part | A Viking Pump bracket engineered to accommodate various seal options including O-Pro® Guard seals, single component seals, cartridge lip seals, cartridge single and double mechanical seals. It also includes stainless steel window guards for protection from rotating parts. |
||
Full Bypass Pressure | Complete Bypass Pressure | Pressure Term | The pressure at which the entire capacity of the pump is bypassing through the relief valve. In other words, this is the maximum differential pressure rating for pumps with internal relief valves or the maximum discharge pressure rating for pumps with return-to-tank valves or in-line system valves.
|
|
Gear Pump | Pumping Principle | Any type of rotary positive displacement pump consisting of gears where the pumping results from the unmeshing and remeshing of gears. The liquid is carried between the gear teeth by the rotation of the pump. Common types of gear pumps include internal gear, external gear, and gerotor. |
||
Cartridge Seal | Seal Type | A mechanical seal or lip seal(s) contained in a preassembled housing to aid in the seal’s installation, maintenance, and replacement. |
||
Maximum Allowable Casing Pressure | MACP | Pressure Term | Maximum rated pressure of the pressure containing components of the pump, not including the shaft seal, but including the canister in the case of Mag Drive pumps.
|
|
Internal Gear Pump | Pumping Principle | A type of gear pump a drive gear featuring inward facing teeth called a rotor. This rotor turns an offset gear with fewer outward facing teeth called an idler. A crescent shape protruding from the head of the pump creates this offset and seals the pumping cavities formed between the gear teeth. Click here to view our How it Works video on this subject. |
||
Lip Seal | Seal Type | Consists of a flexible elastomeric lip in a rigid housing. The lip seal is stationary and the shaft rotates inside. Click here to view the Pump Report on this topic. |
||
Maximum Differential Pressure | Pressure Term | The maximum allowable difference between the Discharge Pressure and the Inlet Pressure for a given set of operating conditions. Calculating: Provided by the Pump Selector program or Catalog Performance Curves, but may be increased or decreased depending on the application specifics, pump size, and construction. This may be less than or equal to the Full Bypass Pressure of the relief valve. |
||
Centrifugal Pump | Pumping Principle | A type of kinetic pump consisting of a rotating impeller in a casing volute. This type of pump transfers rotational energy from the spinning impeller to the liquid. |
||
Idler | Pump Part | A free-rotating part of a rotary positive displacement pump driven by the rotor |
||
Component Mechanical Seal | Seal Type | Consist of two basic parts called faces. One face rotates with the shaft, while a second is held stationary in the pump housing. The primary seal is created between these two seal faces. Click here to view the Pump Report on this topic. |
||
Discharge Pressure | Outlet Pressure; Discharge Head | Pressure Term | Pressure at the outlet port of the pump.
|
|
Circumferential Piston Pump, External Circumferential Piston Pump | CPP, ECCP | Pumping Principle | A type of rotary positive displacement pump consisting of a pair of externally timed rotors such that each is driven independently and the rotors are non-contacting. Rotor designs vary but the most common type is bi-wing. Similar in operation to a lobe pump. Click here to view the Pump Report on this subject. |
|
ProPort™ Casing | Pump Part | Adaptable Viking Pump port design that offers a variety of port sizes and types, enabling flexibility when connecting pumps to piping. |
||
Cracking Pressure | Pressure Term | The pressure at which the relief valve begins to open and bypass liquid.
|
||
Inlet Pressure | Suction Pressure; Suction Head | Pressure Term | Pressure at the inlet port of the pump. May be positive or negative.
|
|
Gerotor Pump | Pumping Principle | A type of internal gear pump that is driven by the idler gear and does not include a crescent. Click here to view our How it Works video on this topic. |
||
API 682 Seal | Seal Type | A special cartridge mechanical seal which has been designed and tested to the American Petroleum Institute’s API 682 standard. |
||
Hydrostatic Test Pressure | Pressure Term | Pressure to which the pump will be subjected to for a short duration to insure
|
||
External Gear Pump | Pumping Principle | A type of gear pump featuring two identical external gears where one gear is the drive gear and one is the driven. The liquid is transferred from between the gear teeth by the rotation of the pump. Click here to view the Pump Report on this subject. |
||
O-ring Seal | Seal Type | Any seal consisting of one or more elastomeric O-rings. These may be static seals wherein there is no relative motion between parts (i.e. an O-ring seal between a pump casing and bracket) or dynamic seals wherein the seal is created between a moving shaft and a stationary housing (i.e. O-Pro® shaft seals). |
||
Maximum Allowable Working Pressure | MAWP | Pressure Term | The maximum continuous pressure for which the pump is designed.
|
|
Vane Pump | Pumping Principle | A type of rotary positive displacement pump consisting of a slotted rotor offset in a cam shaped housing. Sliding vanes in the slots of the rotor extend to create pumping cavities, sweep the liquid through the casing, and expel the liquid at the discharge side of the pump as the cam reduces in area and forces each vane back into its slot. Click here to view our How it Works video on this topic. |
||
Sealless Mag Drive | Seal Type | Comprised of two independent shafts; one connects to the drive and other connects to the pumping elements. A magnetic coupling transmits the rotation of the drive shaft to the driven shaft inside the pump. Click here to view the Pump Report on this topic. |
||
Differential Pressure | Total Dynamic Head; TDH; ΔP) | Pressure Term | The difference between the Discharge Pressure and the Inlet Pressure. Calculating: Differential pressure is a function of the system and must be calculated or measured. Measurements can be made at the gauge ports near the inlet and outlet ports of the pump. |
|
Air Operated Double Diaphragm | AOD, AODD, AODDP | Pumping Principle | A type of pump featuring a pair of opposing diaphragms alternatively expanded by compressed air to expel liquid on the opposite side of the diaphragm. An air valve in the pump shifts the flow of air from one diaphragm to the other resulting in an intake stroke on one side and a discharge stroke on the other. Check valves in the pump prevent the backflow of pumped liquid. |
|
Stuffing Box | Pump Part | For pumps, this is hollow space where the rotating shaft enters the stationary pump housing. While the term originated from shaft packing that was “stuffed” around the shaft to create a seal, today a pump’s stuffing box is often fitted with a mechanical seal, lip seal, or O-Pro® seal instead of packing. |
||
Atmospheres | atm | Units of Measure | A unit of pressure measurement |
|
bar | bar | Units of Measure | A unit of pressure measurement equivalent to 100 kilopascals |
|
Brake Horsepower | BHP | Units of Measure | ||
Barrels per Day | BPD | Units of Measure | A unit of flow measurement |
|
Barrels per Hour | BPH | Units of Measure | A unit of flow measurement |
|
Behind the Rotor Seal | BTR | Seal Type | Any pump wherein the seal is located directly behind the rotor, isolating the shaft bushings or bearings from the pumped liquid. An alternative to pumps with seals located in the stuffing box. |
|
Composite Mag Drive | CMD | Viking Pump Model Series | A series of sealless Mag Drive Viking external gear pumps named such due to their non-metallic, composite construction. |
|
Centipoise | cPs | cP | Units of Measure | A unit of viscosity measurement equivalent to 1 millipascal second |
Centistokes | cSt | Units of Measure | A unit of viscosity measurement equivalent to 1 millimeter squared per second |
|
Foot Pounds, Pound Feet | lb.ft. | ft.lbs. | Units of Measure | A unit of torque measurement |
Gear Pump | GP | Viking Pump Model Series | An older series of Viking external gear pumps which has been largely replaced by the SG Series™ |
|
Gallons per Hour | GPH | Units of Measure | A unit of flow measurement (NOTE: slightly different in US and UK units) |
|
Gallons per Minute | GPM | Units of Measure | A unit of flow measurement (NOTE: slightly different in US and UK units) |
|
Kilopascal | kPa | Units of Measure | A unit of pressure measurement |
|
Krebs Units | KU | Units of Measure | A unit of viscosity measurement |
|
Liters per Hour | LPH | Units of Measure | A unit of flow measurement |
|
Liters per Minute | LPM | Units of Measure | A unit of flow measurement |
|
Low Viscosity Pump | LVP | Viking Pump Model Series | A series of Viking vane pumps named such due to their ability to handle low viscosity liquids even at high pressures. |
|
Millimeter Squared per Second | mm^2/s | mm²/s | Units of Measure | A unit of viscosity measurement equivalent to 1 centistoke |
Millipascal Seconds | mPas | Units of Measure | A unit of viscosity measurement equivalent to 1 centipoise |
|
Cubic Meters per Hour | m^3/hr | m³/hr | Units of Measure | A unit of flow measurement |
Newton Meters | Nm | Units of Measure | A unit of torque measurement |
|
Net Positive Inlet Pressure | NPIP | Units of Measure | The absolute pressure required at the inlet of the pump to prevent cavitation, noted with suffix "A" for available from the system or "R" for required by the pump. Similar to NPSH. |
|
Net Positive Suction Head | NPSH | Units of Measure | The absolute head required at the inlet of the pump to prevent cavitation, noted with suffix "A" for available from the system or "R" for required by the pump. Similar to NPIP. |
|
O-Pro® Seal Technology | O-Pro® | Seal Type | Viking Pump’s patented seals which utilize a series of O-rings to create a robust seal and lubrication chamber, all in one. Click here to view the Pump Report on this topic. |
|
Pounds per Square Inch | PSI | Units of Measure | A unit of pressure measurement |
|
Relief Valve, Pressure Relief Valve | PRV | RV | Pump Part | A mechanical device designed to bypass flow in the result of an overpressure condition at the outlet port of the pump. Click here to view our How it Works video on this topic. |
Spur Gear | SG | Viking Pump Model Series | A series of Viking external gear pumps named such due to the cut of the external gears. |
|
Sabolt Seconds Universal (or Saybolt Universal Seconds) | SUS | SSU | Units of Measure | A unit of viscosity measurement |
Universal Mag Drive | UMD | Viking Pump Model Series | A series of sealless Mag Drive Viking internal gear pumps named such due to their shared dimensions with comparable sized Viking Universal models. Click here to watch the Pump Report related to this subject. |
|
eXtreme Positive Displacement | XPD | Viking Pump Model Series | A series of Viking internal gear pumps constructed to full compliance with API 676 requirements, documentation, and testing. |