standard specification for erection tender - GAIL

should be in AutoCAD (latest version) and all documents in electronic media in
addition to hard copy/ reproducibles as a part of project requirement.
2.38 Unit rate of all items/modules and hardware shall be indicated by contractor for any
future addition/deletion for system related items. This price shall include all
engineering charges, installation, software charges etc. related to the effected
addition/deletion.
2.39 All necessary furniture required for mounting consoles, printers, CRT’s, video copier etc.
shall be provided by the contractor.
3 SPARES PHILOSOPHY
3.1 Mandatory Spares
Mandatory spares for instrumentation and control system shall be provided as below
unless otherwise specified in the job specification:
a) 10% spare instruments or minimum one of each range, type and material of
construction (except for control valves, pressure relief valves, displacer type
instruments, level gauges, flowmeters, analysers and special instruments)
b) 5% or minimum one module for all control systems (DCS/PLC/PG’s/ESD etc.)
3.2 2-years operational spares
Unless otherwise specified in the job specifications, all spares for 2 years of operation
like gaskets, O-rings, diaphragms etc. as required for all instruments for two years of
trouble free operation shall be provided.
3.3 Commissioning spares
Any kind of spares required for start-up & commissioning shall be provided.
3.4 Consumable Spares
Consumable spares for a minimum of one year duration after acceptance and shall
include chart paper, printer paper, ink, cartridges, floppies etc required for recorders,
printers and hard copier units, unless otherwise specified elsewhere.
4 GENERAL REQUIREMENT OF INSTRUMENTS
4.1 Instrument Concept
4.1.1 Major instrumentation shall be electronic type with final control elements as pneumatic.
4.1.2 Electronic Instruments
a) All electronic instruments requiring separate power supply, shall generally operate
on 110 V 50 Hz. Instruments operating at 24 V DC shall also be acceptable.
b) Electronic transmitters shall generally be two wire type. These shall have
transmission/output signal of 4-20 mA DC and shall be capable of delivering
rated current into external load of at least 600 Ω when powered with 24 V DC
nominal voltage.
c) Smart transmitter when selected, shall be used in analog output mode. Digital
integration shall be avoided unless specified otherwise.
STANDARD SPECIFICATION FOR
SPECIFICATION REV-0
GAIL (INDIA) LTD INSTRUMENTATION WORKS
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