standard specification for erection tender - GAIL

� Valve body and trim material shall be SS 316 unless otherwise specified. Superior
trim material shall be selected as required by process conditions. Packing material in general
shall be of PTFE.
� For instrument air isolation valves, body material shall be Nickel or cadmium plated
carbon steel.
� For instrument valves and manifolds specification, refer enclosed standard
specification elsewhere.
5.14 IMPULSE TUBING
� Impulse tubing shall be 1/2" OD x 0.049" thick ASTM A 269 TP 316 stainless steel fully
annealed, cold drawn and seamless tubes as a minimum for impulse lines upto 600 # class.
Higher thickness according to pressure rating shall be considered for higher pipe classes.
� The hardness of SS tubes shall be Rockwell RB 70-79.
� Instrument air distribution shall be with 6 mm soft annealed copper, 1 mm thick PVC
coated as per ASTM B 68M copper no. C 12200
� For tubing and tube fittings specification, refer enclosed standard specification
elsewhere.
5.15 METERING SUPERVISORY SYSTEM
All the process parameters of the skid including flow computer & GC data shall be provided in
the metering supervisory system, which shall be the Human Machine Interface Station
Computer. The operating system of HMI of the Metering Supervisory System shall be window
based. The computer system for the supervisory control system shall be industrial type IBM
compatible, suitable for continuous operation in the non-air-condition environment. It will be
mounted in the control panel. The system shall be supplied complete with keyboard, 17” LCD
Monitor, pointing device, hub, signal converter (RS 485-232 or vice-versa), all accessories,
cables, Connectors and HP laser Printer with 1000 A4 size plain white paper. Licensed version
(in name of “GAIL”) of all the required software to be installed and supplied with the
supervisory system. The supervisory system shall be capable to provide read only data to
consumer through serial communication and shall be web enabled. The computer shall be
capable for generating Reports, Audit trail, current and historical trend for the process
variables. It should have facility of Process data, Alarm manager, Diagnostic Manager
(Automatic Verification), Configuration log, Audit trail etc.
Online validation software with license shall be supplied and shall be installed in HMI.
Validation software shall be compatible with supplied front end software of HMI and shall be
suitable for the application.
GAIL (INDIA) LTD
NEW DELHI
JOB SPECIFICATION FOR GAS METERING
SYSTEM / SKID
JOB SPECIFICATION REV-0
0015-01-08-02-001
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