TECHNICAL SPECIFICATION ON OXYGEN GAS CYLINDERS FOR
ANNULUS GAS SYSTEM
Annexure-1
1.0
REQUIREMENTS
Supplier shall have following technical prequalification criteria:
(a)
(b)
(c)
Supplier shall have its own purification plant for O2.
Supplier shall have online gas testing facility / laboratory along with calibration facility
for their instruments.
Supplier shall have facility for cylinder cleaning and conditioning.
2.0
COMPOSITION FOR GASES
Oxygen (O2) gas to be supplied in cylinders provided by NPCIL. The cylinder
capacity of the O2 cylinder is about 6.23 m3. The cylinder pressure for oxygen (O2)
gas should be about 140 kg/cm2 (g). Original manufacturing source of O2 as well as
their purification process shall be submitted in a block diagram indicating various
chemicals used in the purification process coming in direct contact with gas. The
required quality of O2 is specified below:
Requirements for O2 gas
Parameter
Applicable Standard
Grade
Percentage by Volume
Carbon Monoxide/ Carbon Dioxide
Acid and Sulphur Dioxide
Phosphine and Hydrogen Sulphide
Moisture
Arsenic mg/normal m3
Oil, PPM by weight
Halogen
Cylinder Valve Outlet
Argon (maximum)
Hydrocarbons
Guideline*
Ultra Pure
99.999 (min.)
1 ppm max
2 ppm max
To pass test
( as per IS : 309)
To pass test
( as per IS : 309)
To pass test
( as per IS : 309)
IS: 3224
5 ppm max.
1 ppm max.
Any other impurity (maximum)
Bidder to Specify
Oxidizing Substances
Acidity or Alkalinity
3.0
INSPECTION & TESTING
3.1
Chemical analysis of O2 gases at source i.e. tankers/ containers from which the gas
bottles are filled, shall be carried out in a laboratory. NPCIL QA engineer will witness
the tests. Accuracy of the instrument/ measurement method shall be such that
specified gas quality is complied.
3.2
The test results shall be verified/ cross checked (for sample of gas provided by
manufacturer) by an approved (National/ internationally accredited) laboratory at least
once per year by NPCIL QA.
3.3
The manufacturer should have online instruments / laboratory with calibration facility
for checking purity of O2 as well as method for analyzing impurities as a minimum
for Total hydrocarbon, H2O, CO, CO2, SO2, Ar, Halogen, Phosphine and hydrogen
sulphide, Acid and sulphur dioxide, oil, oxidizing substances, Acidity or alkalinity.
Random testing of the cylinders (1 cylinder for every lot size of 25 cylinders each)
shall also be carried out for all the above mentioned contents. If results are not as per
the specifications, whole lot will be rejected.
3.4
All cylinders for each refill shall be cleaned and conditioned (also for post hydro test
of cylinders) so that no foreign material/ moisture/ contaminant is left in the cylinder
and above purity requirements of O2 is met.
3.5
Inspection and test reports for the tests carried out by manufacturer in accordance
with the specification shall be submitted for review by the NPCIL QA during predispatch inspection.
Note : All the testing should be in the scope of supplier except 3.2.
4.0
SHIPMENT
The contractor shall be responsible for ensuring that cylinders and shut off valves are
suitably packed for shipment so as not to suffer deterioration, damage during transport
and storage in a tropical climate. Each shipment shall be labeled to indicate type and
quantity of cylinders and purchase order number. Contractor shall dispatch equipment
only after issue of shipment release by the purchaser or his authorized representative.
5.0
HISTORY DOCKET REQUIREMENT
As part of the station quality assurance records requirement, a history docket shall be
prepared for each cylinder and submitted to the purchaser at the time of inspection
and delivery of the cylinder. This docket shall consist of the following quality
assurance records/ documents.
a)
b)
c)
d)
e)
Test report of chemical composition of gas.
Test report of accredited laboratory attested by NPCIL QA.
List of deviation from applicable standard specified in this specification.
Any other information which is required to be submitted.
Original manufacturing source of O2 as well as their purification process in a block
diagram indicating various chemicals used in the purification process coming in direct
contact with gas.
Annexure-2
Data to be Furnished by the Bidder
Sr No. Parameter
1.
Cylinder pressure kg/cm2
2.
Gas cylinder cleaning facility details
to be submitted with procedure.
3.
Name
of
the
nationally/
internationally accredited laboratory
for independent verification
4.
Measurement method- online/ lab
(indicate component-wise)
5.
Past sample test results for gas
supplied (minimum 5)
6.
Source of O2 gas.
7.
Chemical composition of gas (All the
parameters mentioned in Table.
Check list to be Furnished by the Bidder
Sr No.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Parameter
Whether test laboratory is available with the supplier
Whether laboratory is NABL approved.
If no, whether you have any NABL approved lab for cross
checking your result.
Are you original manufacturer?
Whether you have purification plant
Whether you have submitted list of chemical used during
process.
Whether you are getting cross checked your result in
National/Internationally accredited laboratory.
Whether you are having a facility for cleaning and
conditioning of cylinders.
Do you have approved procedure for cleaning of cylinder
Have you attached list of supplier.
 YES /  NO
 YES /  NO
 YES /  NO
 YES /  NO
 YES /  NO
 YES /  NO
 YES /  NO
 YES /  NO
 YES /  NO
 YES /  NO