Thursday, 5 November 2015

Pressure Transducer


Pressure Transducer

The electrical interpretation of pressure is based upon the principle of operation of a strain gauge, wherein structural deformation of the load sensitive member of the device called wire grid is measured. When the gauge is subjected to load the wire grid is stretched, changing its diameter and length and its electrical resistance, thus through measurement of the change in resistance of the wire grid with the gage under stress and evaluation of the force producing  the load is obtained.

This operation involve load and pressure from 100 pound to more than 10,000 psi.


Desuperheaters

Desuperheaters

A desuperheaters is to reduce the temperature of superheated steam. The simplest construction of this device involves single or multiple spray nozzles that are inserted into the steam header, allowing water to be sprayed into the steam flow to reduce its temperature. By regulating the water quantity through the desuperheater, the degree of heat absortion can be controlled and desired steam temperature maintained. This mechanically atomized desuperheaters is used both small and large pipelines.

Other desuperheaters design utilize atomizing steam flow to produce a fine spray of atomized cooling water into the steam line. The steam assisted design offer excellent performance at low cost.

For small process lines, a desuperheater which relies on full circle water injection can maintain final temperature to within 20 degree F of saturation in pipe sizes down to 1 inch.