sop for Operation of Nitrogen and Oxygen

1.0 OBJECTIVE:
1.1 To lay down the Procedure for the Operation of Nitrogen and oxygen Plant.
2.0 SCOPE:
2.1 This Standard Operating Procedure shall be applicable for Operation of Nitrogen and Oxygen Plant

3.0 RESPONSIBILITY:
3.1 Operator/Technician-Engineering
4.0 ACCOUNTABILITY:
4.1 Head Engineering Department shall be responsible for compliance of SOP.

5.0 PROCEDURE:
5.1 PRIMARY CHECKS:
5.1.1 The area near the unit should be kept clean.
5.1.2 Check that all electrical system is ok.
5.1.3 Check Control panel is getting power supply.
5.1.4 Ensure that drain valves of all equipment’s are closed.
5.2 OPERATING PROCEDURE:
5.2.1 Switch ON the main switch.
5.2.2 Turn ON the compressor and air dryer, and allow the air receiver to pressurize. Let the compressor keep

running and observe that the compressor shifts to unloaded operation.
5.2.3 Now adjust the pressure regulator placed before the inlet ball valve to required set pressure.
5.2.4 Air received in air receiver tank after filtration and pressure should be up to 5 to 7 kg/cm².
5.2.5 Air transfer into Air Separation tank A and B. A tank supply for Nitrogen Operation and B tank supply for Operation Oxygen.
5.3 OPERATING PROCEDURE FOR NITROGEN
5.2.6 Switch on Control Panel by selector switch and touch on Nitrogen icon then touch the Run icon

on display screen Open air inlet valve for Operating Nitrogen.
5.2.7 Compression, drying and filtering air transfer into Air receiver tank to PSA Modules.
5.2.8 Observe the operation of the unit for some time and see that the PSA module is working properly.

When one PSA Tower Cycle Pressurized then second PSA Tower depressurized.
5.2.9 Our PSA units have two cylinders filled with Carbon Molecular Sieve. (CMS). Compressed and

purified air flows through the cylinder; the CMS bed adsorbs oxygen, while nitrogen passes through to

the nitrogen accumulation tank. The adsorption process is interrupted before the CMS becomes saturated

with nitrogen by diverting the input air to the second cylinder, which at this point starts producing nitrogen

during this step of the cycle, the second cylinder is cleaned.
5.2.10 Check the minimum pressure in the PSA Cylinder should be 5 to 7 kg/cm².Control that air flow by

the valve provided just at the air inlet into the PSA module Setting should be disturbed only after watching the result for 5-10 minutes.
5.2.11 The pressure between the two cylinders is equalized.
5.2.12 The CMS of the first cylinder (now saturated with oxygen) is regenerated by reducing pressure in the

cylinder below that of the adsorption step. The adsorbed oxygen is released and vented into atmosphere. After

this step it is again ready for another cycle.
5.2.13 Adsorption and desorption steps are repeated in the CMS tanks at equal time intervals A constant

flow of nitrogen is stored to nitrogen surge tank and pressure has reached up to 5.5 kg/cm2,
5.2.14 At Complete Operation adsorption process Check the oxygen content in Oxygen Analyzer on control panel.
5.2.15 Check the flow rate of nitrogen via flow meter.
5.2.16 Pure nitrogen goes to Surge tank to Nitrogen Storage Tank.
5.2.17 Open Out let Valve now the plant is ready for normal operation.

5.3 OPERATING PROCEDURE FOR OXYGEN
5.3.1 Switch on Control Panel by selector switch and touch on Oxygen icon then touch the Run icon on

display screen Open air inlet valve for Operating Oxygen.
5.3.2 Compression, drying and filtering air transfer into Air receiver tank to PSA Modules.
5.3.3 Observe the operation of the unit for some time and see that the PSA module is working properly. When one

PSA Tower Cycle Pressurized then second PSA Tower depressurized.
5.3.4 Our PSA units have two cylinders filled with Carbon Molecular Sieve. (CMS). Compressed and purified

air flows through the cylinder; the CMS bed adsorbs oxygen, while nitrogen passes through to the

nitrogen accumulation tank. The adsorption process is interrupted before the CMS becomes saturated

with nitrogen by diverting the input air to the second cylinder, which at this point starts producing nitrogen

during this step of the cycle, the second cylinder is cleaned.
5.3.5 Check the minimum pressure in the PSA Cylinder should be 5 to 7 kg/cm².Control that air flow by the

valve provided just at the air inlet into the PSA module Setting should be disturbed only after watching the result for 5-10 minutes.
5.3.6 The pressure between the two cylinders is equalized.
5.3.7 The CMS of the first cylinder (now saturated with oxygen) is regenerated by reducing pressure in

the cylinder below that of the adsorption step. The adsorbed oxygen is released and vented into atmosphere.

After this step it is again ready for another cycle.
5.3.8 Adsorption and desorption steps are repeated in the CMS tanks at equal time intervals A constant flow

of nitrogen is stored to nitrogen surge tank and pressure has reached up to 5.5 kg/cm2,
5.3.9 At Complete Operation adsorption process Check the oxygen content in Oxygen Analyzer on control panel.
5.3.10 Check the flow rate of nitrogen via flow meter.
5.3.11 Pure nitrogen goes to Surge tank to Nitrogen Storage Tank.
5.3.12 Open Out let Valve now the plant is ready for normal operation.

5.4 SHUT DOWN PROCEDURE FOR NITROGEN:

5.4.1 Touch on the Stop Icon on display screen at control panel and Switch off the control panel by Selector Switch.
5.4.2 Turn off the compressor & air dryer.
5.4.3 Switch ON the main switch.
5.4.4 Stop the air inlet supply valve and out let supply valve.
5.4.5 Maintain Log sheet as per Annexure-I.
5.5 SHUT DOWN PROCEDURE FOR OXYGEN:
5.5.1 Press the Stop Icon on display screen at control panel and Switch off the control panel Selector Switch.
5.5.2 Turn off the compressor & air dryer.
5.5.3 Switch ON the main switch.
5.5.4 Stop the air inlet supply valve and out let supply valve.
5.5.5 Maintain Log sheet as per Annexure-II

SOP	Standard Operating Procedure
QA	Quality Assurance
No.	Number
Pvt.	Private
No.	Number
Ltd.	Limited
EN	Engineering
nm³/hr	Normal Meter Cubed per Hour
kg/cm²	Kilo Per Square Centi meter

Change Control No	Description	New Change	Effective Date	Name
	New SOP	Not Applicable

sop for Operation of Nitrogen and Oxygen

Annexure-I:

NITROGEN PLANT LOG BOOK

Annexure-II

OXYGEN PLANT LOG BOOK

sop for Execution of Preventive Maintenance

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