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JJG 1114-2015: Liquefied Natural Gas Dispensers
JJG 1114-2015
JJG
NATIONAL METROLOGICAL VERIFICATION REGULATION
OF THE PEOPLE’S REPUBLIC OF CHINA
Liquefied Natural Gas Dispensers
ISSUED ON: JUNE 15, 2015
IMPLEMENTED ON: SEPTEMBER 15, 2015
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China
Table of Contents
Introduction ... 5 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and units of measurement ... 6 
3.1 Terms ... 6 
3.2 Units of measurement ... 8 
4 General ... 9 
4.1 Construction ... 9 
4.2 Principle ... 9 
5 Metrological performance requirements ... 10 
5.1 Maximum allowable error ... 10 
5.2 Repeatability ... 10 
5.3 Flow range ... 10 
5.4 Minimum quality variable ... 10 
5.5 Payment amount error ... 10 
6 General technical requirements ... 10 
6.1 Appearance and accompanying documents ... 10 
6.2 Error adjustment ... 11 
6.3 Seal settings ... 11 
6.4 Safety functions ... 12 
7 Control of measuring instruments ... 12 
7.1 Verification conditions ... 12 
7.2 Verification items and methods ... 13 
7.3 Processing of verification results ... 21 
7.4 Verification cycle ... 21 
Appendix A Cryogenic liquids flow standard facilities by weighing method ... 22 
Appendix B Information format of verification certificate/verification result
notification and original record ... 28 
Verification Regulation of Liquefied Natural Gas
Dispensers
1 Scope
This Regulation applies to the initial verification, subsequent verification and
in-service inspection of liquefied natural gas (LNG) dispensers (hereinafter referred
to as dispensers).
2 Normative references
GB/T18442.1, Static vacuum insulated cryogenic pressure vessels - Part 1: General
requirements
GB/T 19204, General characteristics of liquefied natural gas
GB/T 20368, Production, storage and handling of liquefied natural gas (LNG)
GB/T 25986, Filling device of natural gas vehicles
GB 50156, Technical standard of fuelling station
OIML R81:2006(E), Dynamic measuring devices and systems for cryogenic liquids
For dated references, only the dated version applies to this Regulation; for undated
references, the latest edition (including all amendments) applies to this Regulation.
3 Terms and units of measurement
3.1 Terms
3.1.1 Liquefied natural gas (LNG) dispensers
A complete measuring system of LNG semi-invariant – providing LNG filling
service – which generally consists of cryogenic flowmeter, control valve, dispenser
nozzle, reclaiming nozzle, filling hose, reclaiming hose, as well as electronic
computer and ancillary devices.
3.1.2 LNG gas vessel
A vacuum insulated cryogenic pressure vessel used for storing and supplying LNG
fuel, of which the technical indicators shall meet the requirements of GB/T 18442.1.
3.1.3 Filling receptacle
A connecting part, after being connected with the dispenser nozzle, for filling LNG
fuel to the LNG gas vessel.
3.1.4 Reclaiming receptacle
A connecting part, after being connected with the reclaiming nozzle, used to reclaim
the residual gas in the LNG gas vessel.
3.1.5 Circulation receptacle
A connecting part on the gas dispenser used, after being connected with the
dispenser nozzle, for the pre-cooling circulation.
3.1.6 Dispenser nozzle
A special tool for manual operation on the gas dispenser for connecting the filling
receptacle or the circulation receptacle, which shall meet the requirements of GB/T
25986.
3.1.7 Reclaiming nozzle
A special tool for manual operation on the gas dispenser for connecting the
reclaiming receptacle, which shall meet the requirements of GB/T 25986.
3.1.8 Breakaway coupling valve
A special protection device on the gas dispenser, which is installed on the filling
hose and the reclaiming hose of the gas dispenser, and can be broken into two
sections under the action of the rated pull-out force.
3.1.9 Emergency shutdown device
A special protection device on the gas dispenser, which, after being manually
triggered in an emergency, can execute the corresponding shutdown logic, cut off or
isolate the LNG fuel source, and shut down the equipment that will aggravate and
expand the accident due to continued operation. It is generally located at an obvious
location of the gas dispenser.
3.1.10 Electronic computer
A calculation and control device of the gas dispenser, which can receive the flow
electric signal transmitted by the flow meter and the pressure electric signal
transmitted by the pressure sensor, etc., and calculate according to the set parameters;
can carry out data transmission and display operations, and automatically judge and
control the flow of the fluid; has the functions of returning to zero, indicating the
payment amount, etc., and can also realize the adjustment of the measurement error.
refilling. The electronic computer of the gas dispenser automatically controls the gas
filling process, and calculates according to the flow signal output by the flowmeter.
The mass of LNG filled into the gas vessel is the difference between the
measurement value of the liquid-phase flowmeter and the measurement value of the
gas-phase flowmeter (when the gas dispenser is not connected to the reclaiming
pipeline, the measurement value of the gas-phase flowmeter is zero), and the panel
of the gas dispenser displays the final measurement value.
For the gas dispenser used for trade settlement, a gas-phase flow meter must be
installed in the reclaiming pipeline to measure the residual gas in the gas vessel
recycled.
5 Metrological performance requirements
5.1 Maximum allowable error
The maximum allowable error of the gas dispenser is ±1.5%.
5.2 Repeatability
The measurement repeatability of the gas dispenser does not exceed 0.5%.
5.3 Flow range
The mass flow rate of the gas dispenser is less than or equal to 80 kg/min, and the
range ratio is not less than 4:1.
5.4 Minimum quality variable
The minimum quality variable of the gas dispenser shall not be greater than 0.01 kg.
5.5 Payment amount error
The payment amount displayed on the gas dispenser panel shall not be greater than
the calculated payment amount (the product of the unit price and the displayed
value).
6 General technical requirements
6.1 Appearance and accompanying documents
6.1.1 Appearance
6.1.1.1 The nameplate and markings of the gas dispenser shall be clear and reliable.
6.1.1.2 The connectors of the gas dispenser must be firm and reliable, and shall not
loosen or fall off due to vibration.
6.1.2 Accompanying documents
The gas dispenser shall be provided with the factory inspection certificate and the
instruction manual, which shall give the technical requirements, installation
conditions, usage methods, safety protection measures and the like.
6.1.3 Markings and nameplate
6.1.3.1 There shall be obvious safety and operation markings on the dispenser.
6.1.3.2 The nameplate of the gas dispenser generally indicates the following
contents:
1) Manufacturer’s name (trademark), product name and model specifications;
2) Date of manufacture and serial number;
3) Marking and number of the license for manufacturing measuring instruments;
4) Applicable medium, flow range, accuracy grade or maximum allowable error;
5) Applicable ambient temperature range, maximum working pressure, power
supply voltage;
6) Explosion-proof grade, explosion-proof identification and explosion-proof
certifica...