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The Clean Air Act of 1990 placed limits on fugitive emissions from pumps. Seal manufacturers responded with improved designs and better materials. In October, 1994, the American Petroleum Institute released API Standard 682, "A Shaft Sealing Systems for Centrifugal and Rotary Pumps”. This standard had a major effect on the sealing industry.
In large pumps with shafts 100–350 mm (3.9–13.8 in) in diameter, the risk of failure is higher due to the changing requirements on the pump performance – for example, load changes during operation. The introduction of SiC/SiC as a shaft sleeve material has proven to be very successful.
API Standard 682, titled "Pumps - Shaft Sealing Systems for Centrifugal and Rotary Pumps," is the American Petroleum Institute standard for end-face mechanical seals. [1] The purpose of API 682 is to assist in the selection and operation of end face mechanical seals in centrifugal pumps. It is based on the combined knowledge and experience of ...
The seals are installed in pumps in a wide range of industries including chemicals, water supply, paper production, food processing and many other applications. [1] A stationary seal may also be referred to as a 'packing'. Seal types: Induction sealing or cap sealing; Adhesive, sealant; Bodok seal, a specialized gas sealing washer for medical ...
VZS/Seagoe Advanced Ceramics Ltd. made ceramic products in Glenrothes, including stand-off insulators, switch gears, circuit breakers, ball valves, pump shafts and bearings, trays and boiler ferrules. Its products were used in semiconductor, defense, chemical, laser, electrical, textile, and paper applications.
A flexible impeller pump is a positive-displacement pump that, by deforming impeller vanes, draws the liquid into the pump housing and moves it to the discharge port with a constant flow rate. The flexibility of the vanes enables a tight seal to the internal housing, making the pump self-priming , while also permitting bi-directional operation.
The power needed from the drive is proportional to the pressure and capacity of the pump. [1] Seals are an integral part of piston pumps and plunger pumps to separate the power fluid from the medium that is being pumped. A stuffing box or packing is used to seal the joint between the vessel where the medium is transferred and the plunger or ...
Whereas standard pumps with shaft seals have multiple chambers with different rotating parts in each, canned rotor technology allows all of the rotating parts within the pump to exist in a single chamber. This increases the overall efficiency since the liquid used to lubricate the shaft bearings is also used to cool the motor. [3]