© 2019 Department of Petroleum Resources. All rights reserved Department of Petroleum Resources (DPR) PROCEDURE GUIDE

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blowdown, purging, or ESD operation the meter readings so recorded shall be 
forwarded within 24hours to the DPR nearest office with a detailed report on the 
scenarios of releases. This report shall form the basis of no charge on the flare gas 
releases. If the flare releases are operational philosophy the meter reading shall comply 
with fuel gas measurement systems and all the conditions attached thereof. 
 
1.20 GAS SAMPLER SYSTEMS 
 
1.20.1 Functional requirements 
1.20.1.1 General 
 
The system shall collect and store a representative gas sample at line conditions, 
allowing it to be transported to the laboratory for analysis. The system shall be 
mounted as close as possible to the pipeline to collect samples over a sample period, 
unattended. The system shall be in accordance with ISO 10715. The distance to the 
nearest upstream disturbance, shall be at least 20 ID. The measurement system shall 
control an automatic gas sampler system, i.e. 
• provide a flow proportional by mass pacing signal (and a fall-back signal) 
 
• monitor the sample volume collected and status of the sampling system. 
 
In addition, there shall be a manual sample point, where the manual sampling probe 
shall be installed such that a representative sample of the gas can be collected. The 
distance to the nearest upstream disturbance, shall be at least 20 ID. However, if an 
auto-sampler or OGC sampling probe is included in the measurement system the 
manual sampling may be taken from the same probe. 
 
1.20.2 Equipment/Schematic 
 
The system consists of a probe, a by-pass loop, two separating devices (sample 
collection pumps), an instrumentation supply system, a timing system and two sample 
receivers (collection cylinders) for sample transportation. 
The sample equipment shall be contained in a cabinet with exception for: 
 
• 
the probe, 
 
• 
tubing to/from the mainline and 
 
• 
the back-pressure system. 
 
The manual sample point shall be equipped with flushing facilities and a 
cabinet/enclosure with required valves and quick connectors in addition to an 
arrangement where the sample cylinder can be placed during spot sampling. 
 
1.20.3 Performance 
 
1.20.3.1 General 
ISO 10715 describes the performance requirements for a fiscal sampling system. 
 
1.20.3.2 Operational Requirements 
 
The control function shall be done from a dedicated controller, SAS or a measurement 
system. There shall be monitoring of maximum filling with adjustable alarm setting. In 
addition, the measurement system shall provide a flow proportional pacing signal and 
monitor the sample volume collected and status of the sampling system. 
 
1.20.3.2.1 Isolating and Sectioning 
 
It shall be possible to isolate the system from the main process. 
 
1.20.3.2.2 Layout Requirements 
 
ISO 10715 describes the layout requirements for a fiscal sampling system.