standard specification for erection tender - GAIL

4.0 PROCESS DESCRIPTION
4.1. PROCESS DATA
� The bidders shall design the skid considering the worst case process condition
scenario.
� The set pressure of Pilots for PCV & SDV shall cover the complete range of inlet
& out let condition. For PCV, SDV , if one pilot is not able to cater the complete
range then installed pilot with additional loose springs shall be supplied to cover
the entire range. The pilot should be designed such as to handle traces
of moisture and condensate. Special care to be paid for dealing with
the problem arising from possible condensation due to pressure
reduction. Provision for heating of pilot gas to be provided.
� The main line PSVs shall be of full capacity (each PSV shall cater complete flow
capacity). The PSVs for each Filter shall be designed for fire case. The Mainline
CRVs shall be redundant (1 working + 1 standby) and each independent CRV
shall cater flow of 1% of the rated flow capacity. The PSV / CRV to be designed
in such a way that the set pressure can be adjusted within the whole operating
and design pressure range/ set points. Separate spring(s) shall be provided, if
one spring is not sufficient to meet the requirement.
4.2. Detailed Process conditions:
ITE
M
NO
FLOW
(MAX/NORMAL/MI
N)
1 -/6/* MMSCMD
Check Metering
System
2 2/1.3/* MMSCMD
SKID
GAIL (INDIA) LTD
NEW DELHI
INLET
PRESSUR
E RANGE
60-92
kg/cm2
60-92
kg/cm2
IN LET
TEMPERATUR
E RANGE
-5 to 55 deg
C
-5 to 55 deg
C
SCOPE OF WORK
OUT LET
PRESSUR
E RANGE
60-92
kg/cm2
40-47
kg/cm2
* Min flow to be specified as per meter turn down
CLASS
RATING
Inlet/Ou
t let
600#
/600#
600#
/300#
Typical
Gas
compositio
n
As given
below
As given
below
4.3. Specific Gravity of 0.57-0.72 shall be considered, Temperature range -5-
55 deg celcius for the purpose of sizing.
Design Temperature: -29 to 65 deg C.
Design Pressure : 92 Kg/cm2(g)
DOCUMENT NO. REV-0
0015-01-08-06-001-SW
Page 28 of 43
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