Engineers that specify an appropriate
mechanical sealing system on their pumps can significantly improve the energy
efficiency of a manufacturing plant as it is estimated that around10
% of electrical power is used for pumping equipment. Unsurprisingly,
regulatory bodies and engineers are focussed on improving the energy efficiency
of pumps and pumping systems. Choosing the right mechanical seal is one of the
most effective ways of doing this.
The purpose of a mechanical seal is to ‘seal’
the process fluid - whether it is toxic or expensive, the objective is to keep
it within the system and pipe work to avoid it seeping out and resulting in a
cost for lost process fluid and clean up. And, of course, if the liquid or
process fluid that is leaking is heated, it is losing costly energy from the
system. So, be it with flanges, valve stems or pump seals, it is necessary to
think of the seal not only as preventing process fluid contamination and
leakage to external atmosphere but as an important part of conserving energy
within the system.
Mechanical seals on pumps are probably the
most delicate components and we use seal flush plans to change the environment
that the seals operate in and that makes them flourish and provide reliable operation.
Flush plans are formalised by the American Petroleum Institute in their
standard API-682, the custodian of the flush plans,
where they are detailed in standardised formats.
Water pumps are one of the most important mechanical devices
with application in several industries and households. Growing urbanization and
industrialization in the developing countries and increasing use of water pumps
in industries is driving the demand of water pumps market globally. Based on
end user applications, water pumps are categorized under four segments namely
industrial water pump, municipal water pump, agricultural water pump, and
domestic water pump.
Based on technology, the two categories of water pump are
centrifugal water pump and positive displacement design. Centrifugal water
pumps are used widely in buildings, wells, fire protection system and hot water
circulation in industries, whereas positive displacement design type water
pumps are used in hydraulic systems. Positive displacement design pumps are
further segmented as reciprocating, metering, and rotary pumps. Positive
displacement design pumps are generally larger than centrifugal pumps of
equal-capacity.
Asia Pacific is the largest market for water pumps followed by
Europe and North America. Asia Pacific has the highest growth rate in the water
pumps market, mainly due to surge in infrastructural developments in developing
countries such as India and China. On the basis of product segments,
centrifugal water pumps hold majority of the market share and is expected to
grow further with steady rate owing to increasing demand from industries such
as oil and gas and municipalities. By end user application, industrial water
pumps had the largest market share in 2013 in the water pumps market.
Industrial water pumps are also growing at a high rate due to increasing
industrialization in growing Asia Pacific countries where oil and gas industry
are the major end users of water pumps.
The increasing number of water recycling and water waste
treatment plants, especially in India and China, is fuelling the water pumps
market in Asia pacific. New technologies, such as intelligent pump system, in
the water pump industry have been extending their cost benefits to the users.
Apart from water circulation, water pumps find their usage in several household
applications including in-house water fountain, gardening, and water coolers.
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