CONSTRUCTIONAL FEATURES Clause Samples

CONSTRUCTIONAL FEATURES.  The Switch Boards shall be metal enclosed, sheet steel cubicle pattern, extensible, dead front, floor mounting type and suitable for indoor mounting.  The Switch Boards shall be totally enclosed, completely dust and vermin proof. Synthetic rubber gaskets between all adjacent units and beneath all covers shall be provided to render the joints dust and vermin proof to provide a degree of protection of IP 42. All doors and covers shall also be fully gasketed with synthetic rubber and shall be lockable.  The Switch Board shall be fabricated with CRCA Sheet Steel of thickness not less than 2.0 mm and shall be folded and braced as necessary to provide a rigid support for all components. The doors and covers shall be constructed from CRCA sheet steel of thickness not less than

CONSTRUCTIONAL FEATURES a. The butterfly valve shall be of concentric type and suitable for Bi directional flow with zero leakage b. The butterfly valve shaft and disc shall be designed to withstand full differential pressure across the closed valve disc. c. For butterfly valves, the disc shall rotate from the full open to the tight shut position. The disc shall be contoured to ensure the least possible resistance to flow and shall be suitable for throttling operation. While the disc is in the throttled position, valve shall not create any noise or vibration. All butterfly valves shall be suitable for throttling application from 5 to 90 Deg. i.e., by default, the valve shall be of Inching / regulating type. d. The butterfly valves shall be suitable for indoor/outdoor installation with shaft either in horizontal or vertical position. e. Sleeve and other bearings fitted into the valve body shall be of self-lubricated materials shall not have any harmful effect on water or rubber and coefficient of friction of the material shall not exceed 0.25, when run at the maximum bearing pressure. f. All butterfly valves shall be closed by rotating the hand controls in the clockwise direction. The pulling force required on the hand wheel rim shall not exceed 25 kgf when operating the valve under full flow and operating pressure. g. Gear Operator shall be totally enclosed helical worm or combination of helical worm and spur gear in grease case with grease nipples / plugs with position indicators for open / close positions and with limit stops. h. Butterfly valve actuators shall be equipped with adjustable, mechanical, stop limiting devices to prevent over-travel of the valve disc in the open and closed positions. NAottacNhom. e#n1t:PR DOCS – MAIN –19B0H01A4R12A2T6-HFREAAMVEY WELOERCKT-RCIACSATLISROLINMBITUETTDERFLY VALVES.pdf Form No: PROJECT ENGINEERING & SYSTEMS DIVISION TECHNICAL SPECIFICATION FOR BUTTERFLY VALVES (WAFER/WAFER LUG) WITH RESILIENT SEAT F0R WATER / AIR SERVICE PY 52 148 Rev. No. 10 i. Actuator, housings, supports and connections to the butterfly valve shall be designed with a minimum safety factor of 5, based on the ultimate tensile strength, or a minimum safety factor of 3, based on the yield strength of materials used. j. The actuator shall be designed to control the butterfly valve in all positions from fully open to fully closed and from fully closed to fully open with control in any intermediate position. k. For Pneumatically operated valves purchaser will provide ½” conn...

CONSTRUCTIONAL FEATURES. Double ball air valves shall be of the kinetic, double orifice type able to release air in small quantities under pressure and in large quantities during filling. They have to allow for large inflow of air during emptying. The type and locations shall be fixed according to the detailed design and after approval by the Engineer in charge. The valves shall have an integrated sluice valve. The possible air velocity (inflow and outflow) must be at least 20 m/s. Body CI to IS Gr. FG 200 Cowl CI to IS Gr. FG 200 Valve seat, nut Leaded tin bronze Spindle SS. AISI 304 Orifice SS. AISI 304 Ball Seasoned teak wood, covered with neoprene rubber Ball seat Anti-stick material such as nitrile rubber or equivalent Pressure Suitable for 16 Kg / ▇▇.▇▇, Working Pressure.