4 General Technical Specification of Bhilai Steel Plant, SAIL ...
4 General Technical Specification of Bhilai Steel Plant, SAIL ...
4 General Technical Specification of Bhilai Steel Plant, SAIL ...
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© 2007 MECON Limited<br />
All rights reserved<br />
<strong>General</strong> <strong>Technical</strong> <strong>Specification</strong><br />
For higher sizes to meet larger flow rates, the pressure regulator shall be self actuating<br />
type as per manufacturer’s standards, but capable <strong>of</strong> meeting the service conditions and<br />
duty specified.<br />
002 For Steam<br />
For sizes up to DN 50, pressure reducing valves <strong>of</strong> single seated diaphragm type having<br />
in-built strainer, with screwed ends up to DN 20 for PN 10 and below and flanged ends<br />
for higher sizes and for higher PN. Body <strong>of</strong> main and pilot valves shall be <strong>of</strong> carbon steel<br />
/ alloy steel castings / forging, diaphragms shall be <strong>of</strong> stainless steel, internal springs <strong>of</strong><br />
stainless steel and pressure adjustment springs <strong>of</strong> spring steel.<br />
For higher sizes to meet larger flow rates, the pressure reducing valves shall be as per<br />
manufactures standards, but capable <strong>of</strong> meeting the service conditions and duty<br />
specified.<br />
003 For Other Gases<br />
For dry air, nitrogen and argon the pressure reducing valves shall be <strong>of</strong> stainless steel.<br />
For oxygen service, the valve shall be <strong>of</strong> bronze construction and shall be degreased and<br />
cleaned to meet the service requirements.<br />
For acetylene and LP gas services, the pressure regulators shall have material for the<br />
service.<br />
Pressure regulators for large diameter gas lines shall comprise butterfly type valves<br />
actuated by means <strong>of</strong> an oil hydraulic control system, which is actuated in turn by<br />
changes in the preset downstream pressure through impulse pipe work.<br />
Pressure Relief Valves<br />
These shall be spring loaded type and shall automatically open when the pressure on<br />
the pipelines, on which they are mounted, exceed preset values. The valves shall have<br />
end connections and materials specified for throttling valves in relevant PMS.<br />
Relief / Safety valves for steam service shall have IBR certification. Relief valves shall<br />
have hand wheel / wrench for adjustment <strong>of</strong> preset value <strong>of</strong> relief pressure.<br />
Pressure relief valves shall always be used on outlet lines from the pressure reducing<br />
valves. Pressure relief valves shall be designed for full flow rate from pressure<br />
regulators. Set pressure shall be 10 % higher than the maximum working pressure at<br />
outlet <strong>of</strong> regulator.<br />
Filters<br />
Filters will be installed in piping system before the pressure regulators/ control valves<br />
and at consumer points depending on nature <strong>of</strong> fluid and technological requirements. For<br />
small size pipes below DN 50, Y-type strainers with sintered/ wire mesh cartridge may be<br />
used. For higher sizes, straight line mounted filters with removable cartridge shall be<br />
used.<br />
Filter element can be <strong>of</strong> wire mesh, sintered material, woven fibers or other suitable type<br />
as per process requirement. Filtration area shall be at least 500% <strong>of</strong> the inlet cross<br />
section area.<br />
Gases & Liquid Fluids<br />
Page 14 <strong>of</strong> 51<br />
GS-02
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