Bevel-helical gear Reduction Box B4 is lower than the minimum input speed n it may B4HV-21-C

Flender/Flender Gear Units/Bevel-helical gear Reduction Box B4

tre am piping. 4. Trim shall be multistage type having sufficient number of di screte pressure drop turns (stages) to ensure elimin ation of vibration, erosive ction, cavitations. Tenderer shall identity the numbe of pressure drop turns in proposed equipment and shall also provide calculation demonstrating compliance to the trim exit velocity. 5. To prevent flow induced vibra tion and to protect the valve ntervals from foreign particles such as weld slag flow, direction shall be flow to close (over the plug) configuration for liquid applications. To maximize noise attenu ating benefits and to allow for constant fluid expansion, flow direction shall be under the plug for steam and gas applications. 6. Control valves as per application all control valves such as low and high range feed control valves shall have mi . leakage rate as per leakage class standard code shall be finalized duri ng detailed engineering 7. The control valve induced noi se shall be limited to 8 dBA at 1 meter from the valve surface under actual operating conditions. The noise abat ement shall be achieved by valve body and trim de sign and not by use of silenc ers. 8. The characteristic of the control valves shall be determined based on the application / service. 9. On supply air/Nitrogen or elect rical failure for pneumatic / electrical drive, the valve shall remain full closed, open or stay put position as per process safety requirement. . VALVE CONSTRUCTION 1. Proper selection of valve type and material of construction to meet operating requirement. 2. All valves shall be of globe body design and straightaway pa ttern with single or double port unless otherwise reco mmended by the manufacturer to be of angle body type. Rotary valve may alternatively be offered when press ure or pressure drops permit. 3. Valves with high lift cage guided plugs & quick charge trims shall be supplied. 4. Cast iron valves are not acceptable. 1 of 1 INDRADHANUSH