B4KV-9-C dding phase based on the tech nical boundary condi Bevel-helical gear Reduction Box B4

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

Valve actuators and stems sh all be adequate to handle the unbalanced forces occurring under the specified flow conditions or the maximum di fferential pressure specified. An adequate allowance for stem force, at le ast 0.1 kg / cm2 per linear millimeter of seating surface, shall be provided in the selection of the actuator to ensure tight seati ng unless otherwise specified. 3. The travel time of the act uators shall not exceed 1 seconds . 4. For quick opening / closing services (such as fuel oil shut off valve), the actuator shall be pilot solenoid operated pneumatic drive, the rating of solenoid shall be 2V DC or 1 AC shall be decided during detail engi neering. 1 of 1 INDRADHANUSH GAS GRID LIMITED TECHNICAL SPECIFICATION FOR NATURAL GAS COMPRESSOR STATION FOR NORTH EAST GAS GRID PIPELINE PROJECT TS NO.: MEC//2UU/0/2/0 Control & Instru mentation (&) Chapter-0.0 2, MECON Limited, All Right Reserved Page 3 of 1 5. Selection of actuator shall be such that it meets the requir ements of thrust / torque, stroke length, angular movement, full scale travel time, repeat ability & accurate positioning for successful operation of final control element. 6. All the actuators shall have also provision for manual opera tion during emergency / maintenance along with graduated local positio indicator. . CONTROL VALVE ACCESSORIES All control valve accessories such as self reset type air / nit rogen lock valves with tubing, hand wheels / hand jacks, SMART positioners, solenoid alves, volume booster, air filter & regulator, diffusers, external volume cha mbers, position transmitters (capacitance or resis tance type only), tubing, fit tings and junction boxers etc. shall be provided as per the re quirements. Specification for Smart Positioners .No. Feature Minimum Requirement 1 Input 4-2 mA DC 2 Power Supply 2 DC Loop powered 3 Type of Electronics Microprocessor based with self diagnostic facility & digit