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Questions and Answers
What is prohibited within the Storage Site area and within 50 feet of the fence?
smoking
What must personnel monitor during an LNG transfer to prevent overpressure and filling?
flow rates, liquid levels, and tank pressures
Who is authorized to operate the LNG Storage Sites?
trained personnel authorized by Interior Gas Utility
What is prohibited within the Storage Site area and within 50 feet of the fence?
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What type of electrical equipment may be used or worn within the site?
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What must transport personnel wear while performing LNG transfer work?
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What procedures must be followed if the pressure in the tank being filled exceeds 70 psi?
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What must be done if suspected or found "Hot," LNG loads?
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What valve must be open to bypass the boiloff gas backpressure regulator REG640 if necessary?
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What must be returned to their desired open or closed positions before leaving the storage site?
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Study Notes
Procedures for LNG Transfers at Interior Gas Utility Storage Sites
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Written procedures for conducting LNG transfers must be kept onsite at both storage sites.
-
Only trained personnel authorized by Interior Gas Utility are allowed to operate the LNG Storage Sites.
-
Smoking is prohibited within the Storage Site area and within 50 feet of the fence.
-
No electrical equipment may be used or worn within the site unless rated as Class 1, Division 1 electrical equipment.
-
Access paths to loading and unloading areas must be posted with "NO SMOKING" signs.
-
Transport personnel must wear personal protective wear while performing LNG transfer work.
-
The maximum liquid level for storage site #1 must not exceed 90,120 gallons.
-
Personnel must monitor flow rates, liquid levels, and tank pressures during an LNG transfer to prevent overpressure and filling.
-
High-pressure load procedures must be followed if the pressure in the tank being filled exceeds 70 psi.
-
If suspected or found "Hot," LNG loads must not be initiated.
-
If necessary, bypass valve V647 must be open to bypass the boiloff gas backpressure regulator REG640.
-
Before leaving the storage site, all storage tank, transfer and transport valves must be returned to their desired open or closed positions.Procedures for LNG Transfer by Pressure Transfer and Pump Transfer
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The procedures for LNG transfer by pressure transfer and pump transfer are to be used in association with safety and initial inspection and preparation procedures.
-
For pressure transfer, the transfer line must be connected to the tank's vapor return line, and the meter run by opening valves V640 and V641 on the 4” bypass line.
-
Tank and distribution pressures must be monitored during the offload with the standard offload and shutdown procedures.
-
The cryogenic pump may be used for LNG transfer if pressure transfer is not possible or desired.
-
Personnel must monitor flow rates, liquid levels, and tank pressures during an LNG transfer to prevent overpressure and filling.
-
Pump transfer requires clearing the pump of any snow, ice, or frost and coupling the Auxiliary Pressure Equipment (APE) hose to the vapor recovery port of the transport.
-
The liquid out valve on the transport must be slowly opened, and the transfer hose and pipe leading to the pump skid purged before starting the pump.
-
The pump must be cooled down to operating temperatures before it's started, and the pump is on a timer and will not start for 5 minutes.
-
Transport pressure building coils and pump must be monitored and regulated to ensure continuous and rapid transfer of the LNG.
-
If the target storage tank will become full before the transport empties, the top-fill valve of the secondary storage tank must be opened before the target tank is full.
-
The operator must check the storage tank, transfer and transport valves, and all pressure indicating controllers before leaving the storage site.
-
In case of abnormal conditions during pump transfer, the transfer must be stopped if tank pressures become too high in storage tanks. The transfer may continue or be restarted once tank pressure subsides to normal.
Procedures for LNG Transfers at Interior Gas Utility Storage Sites
-
Written procedures for conducting LNG transfers must be kept onsite at both storage sites.
-
Only trained personnel authorized by Interior Gas Utility are allowed to operate the LNG Storage Sites.
-
Smoking is prohibited within the Storage Site area and within 50 feet of the fence.
-
No electrical equipment may be used or worn within the site unless rated as Class 1, Division 1 electrical equipment.
-
Access paths to loading and unloading areas must be posted with "NO SMOKING" signs.
-
Transport personnel must wear personal protective wear while performing LNG transfer work.
-
The maximum liquid level for storage site #1 must not exceed 90,120 gallons.
-
Personnel must monitor flow rates, liquid levels, and tank pressures during an LNG transfer to prevent overpressure and filling.
-
High-pressure load procedures must be followed if the pressure in the tank being filled exceeds 70 psi.
-
If suspected or found "Hot," LNG loads must not be initiated.
-
If necessary, bypass valve V647 must be open to bypass the boiloff gas backpressure regulator REG640.
-
Before leaving the storage site, all storage tank, transfer and transport valves must be returned to their desired open or closed positions.Procedures for LNG Transfer by Pressure Transfer and Pump Transfer
-
The procedures for LNG transfer by pressure transfer and pump transfer are to be used in association with safety and initial inspection and preparation procedures.
-
For pressure transfer, the transfer line must be connected to the tank's vapor return line, and the meter run by opening valves V640 and V641 on the 4” bypass line.
-
Tank and distribution pressures must be monitored during the offload with the standard offload and shutdown procedures.
-
The cryogenic pump may be used for LNG transfer if pressure transfer is not possible or desired.
-
Personnel must monitor flow rates, liquid levels, and tank pressures during an LNG transfer to prevent overpressure and filling.
-
Pump transfer requires clearing the pump of any snow, ice, or frost and coupling the Auxiliary Pressure Equipment (APE) hose to the vapor recovery port of the transport.
-
The liquid out valve on the transport must be slowly opened, and the transfer hose and pipe leading to the pump skid purged before starting the pump.
-
The pump must be cooled down to operating temperatures before it's started, and the pump is on a timer and will not start for 5 minutes.
-
Transport pressure building coils and pump must be monitored and regulated to ensure continuous and rapid transfer of the LNG.
-
If the target storage tank will become full before the transport empties, the top-fill valve of the secondary storage tank must be opened before the target tank is full.
-
The operator must check the storage tank, transfer and transport valves, and all pressure indicating controllers before leaving the storage site.
-
In case of abnormal conditions during pump transfer, the transfer must be stopped if tank pressures become too high in storage tanks. The transfer may continue or be restarted once tank pressure subsides to normal.
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