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Glossary

  • Bar (pressure)

pressure in atmospheres, approx 14.7 psia.

  • Biofilm

a thin layer of microorganisms adhering to the surface of a structure, which may be organic or inorganic, together with the polymers that they secrete.

  • Brittle

A material is brittle if, when subjected to stress, it breaks without significant deformation (strain).. Brittle materials absorb relatively little energy prior to fracture, even those of high strength. Breaking is often accompanied by a snapping sound. Brittle materials include most ceramics and glasses (which do not deform plastically) and some polymers, such as PMMA and polystyrene.

  • Bushing

A removable sleeve or liner for a bearing, or a connection used to reduce the size of an opening. Bushings have both static and dynamic surfaces.

  • Butterfly Valve

The name of this valve comes from the wing-like action of the flow-controlling disc, which operates at right angles to the flow. The disc has about the same diameter as the connecting pipe, and the flow is straight through, with a low pressure drop. Maintenance is easy due to the small number of moving parts. The butterfly valve can be used either as an on/off or modulating type of valve.

  • Butt-Fusion

A method of joining pipe, sheet, or other similar forms of a thermoplastic resin wherein the ends of the two pieces to be joined are heated to the molten state and then rapidly pressed together to form a homogeneous bond.

  • Carbon Black

A black pigment produced by the incomplete burning of natural gas or oil. It is widely used as a filler, particularly in the rubber industry. Because it possesses useful ultraviolet protective properties, it is also much used in polyethylene compounds intended for such applications as cold water piping and black agricultural sheet.

  • Carbon Dioxide

a colorless gas. Corrosive when occurring with water. An acid gas. The most common cause of corrosion in the oil industry

  • Carbon Fibre

alternatively graphite fiber, carbon graphite or CF, is a material consisting of fibers about 5–10 μm in diameter and composed mostly of carbon atoms. The carbon atoms are bonded together in crystals that are more or less aligned parallel to the long axis of the fiber. The properties of carbon fibers, such as high flexibility, high tensile strength, low weight, high resistance, high temperature tolerance and low thermal expansion.

  • Cast

to form a plastic object by pouring a fluid monomer-polymer solution into an open mould where it finishes polymerising.

  • Check Valves

Check valves are used to prevent the reversal of flow in a line. When open and under flow pressure, the checking mechanism will move freely in the media, offering very little resistance and minimal pressure drop. We offer two basic types of check valves: swing check valves and ball check valves. A swing check valve utilizes a swinging disc, which requires only minimal back pressure to close the valve. This valve can also be modified, with a lever and weight or spring, to assist in seating faster to eliminate shock. The Asahi/America ball check valve employs a free moving ball, which unseats to permit flow in one direction, but seals against a seat to prevent backflow. Both types of valves may be installed vertically or horizontally.

  • Chemical Inertness

Chemical inertness means no or very less ability to react with other elements or compounds , it depends mainly on the valency of elements. elements usually react with other substances because they have to satisfy their valency by filling their octets , but those elements which already have a completely filled octet shows no or very less reactivity towards other elements. and rarely react with other elements . this is known as chemical inertness.

  • Chemical Resistance

the ability to resist chemical attack

  • Clearance

A controlled distance by which one part of an object is kept separated from another part.

  • Coefficient of Expansion

The fractional change in length (sometimes volume, specified) of a material for a unit change in temperature. Values for plastics range from 0.01 to 0.2 mils/in., Deg C

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