Operation procedures for liquid nitrogen refilling system at gas cylinder storage area
Operation procedures for liquid nitrogen refilling system at gas
cylinder storage area
1. To be qualified to operate liquid nitrogen refilling system, users must fulfill the
followings. Fill out the application permission form (as attached) and submit to
Cryogenics Group. Learn the operation procedures and safety notes. Receive hand-on
safety training and obtain qualification to be authorized to access the refilling system.
2. It requires a team of at least two qualified persons to refill liquid nitrogen, and you must
not involve in refilling process when in fatigue.
3. You must be aware of the operation procedures and safety notes before operating
refilling system. Follow the standard operation procedures faithfully without changing
any defined condition.
4. Use appropriate protection equipment during refilling, such as glove, goggle, face-shield
and ear-muffs to prevent cold contact burns if spills.
5. Prepare connector before refilling. Don’t contact the valve and the surface of container
and don’t stand at the direction of venting during refilling. You must watch the whole
refilling process and must not leave. Stop the refilling immediately if any abnormal
situation occurs and report to Cryogenics Group.
6. If pressure reduction is necessary during the refilling of liquid nitrogen or compressed
gas, you must adjust the regulator. Close the regulator first and open the source of
compressed gas secondly, re-open regulator and adjust flow rate to accommodate desired
pressure. It is not allowed to open compressed gas source while the regulator is left
open simultaneously. Depressurization is required after the use of high pressure device.
7. Interior of pipe line, valve, gauge, regulator and gas transport line should be kept clean
without contamination of oil or impurities.
8. High pressure vessel must not be connected to liquid nitrogen refilling system. The
liquid nitrogen container must have relief valve with pressure setting less than 2kg/cm2.
9. The residual pressure of liquid nitrogen container must be less than 0.5 bar before safe
refilling initiates.
cylinder storage area
1. To be qualified to operate liquid nitrogen refilling system, users must fulfill the
followings. Fill out the application permission form (as attached) and submit to
Cryogenics Group. Learn the operation procedures and safety notes. Receive hand-on
safety training and obtain qualification to be authorized to access the refilling system.
2. It requires a team of at least two qualified persons to refill liquid nitrogen, and you must
not involve in refilling process when in fatigue.
3. You must be aware of the operation procedures and safety notes before operating
refilling system. Follow the standard operation procedures faithfully without changing
any defined condition.
4. Use appropriate protection equipment during refilling, such as glove, goggle, face-shield
and ear-muffs to prevent cold contact burns if spills.
5. Prepare connector before refilling. Don’t contact the valve and the surface of container
and don’t stand at the direction of venting during refilling. You must watch the whole
refilling process and must not leave. Stop the refilling immediately if any abnormal
situation occurs and report to Cryogenics Group.
6. If pressure reduction is necessary during the refilling of liquid nitrogen or compressed
gas, you must adjust the regulator. Close the regulator first and open the source of
compressed gas secondly, re-open regulator and adjust flow rate to accommodate desired
pressure. It is not allowed to open compressed gas source while the regulator is left
open simultaneously. Depressurization is required after the use of high pressure device.
7. Interior of pipe line, valve, gauge, regulator and gas transport line should be kept clean
without contamination of oil or impurities.
8. High pressure vessel must not be connected to liquid nitrogen refilling system. The
liquid nitrogen container must have relief valve with pressure setting less than 2kg/cm2.
9. The residual pressure of liquid nitrogen container must be less than 0.5 bar before safe
refilling initiates.
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