Metering audits are used to make sure that currently installed metering systems are fit for purpose and are measuring quantities accurately and within allowable uncertainty limits. Regular auditing gives auditiee and client an assurance that currently installed metering system are operated and maintained per recommended industry guidlines, and thus ensure high level of confidence into reported figures.
MIMO can supply experienced metering and allocation auditors to assess the overall system health of your metering systems, depending on the region of the world where metering systems are installed our auditors are equally skilled to assess metering systems against various metering guidelines.
Outlined below are most common audit steps taken by our auditors, inluding short descriptions of the activities.
Visual Inspection of Measurement Skid, noting down equipment serial number, checking pipe lenghts upstream and downstream of meter, checking insulation, meter positions, presence of flow conditioners, overall state of equipment etc. Cross checking records against records, meter removals etc.
Visual Inspection of sampling skids, checking pipe dimensions upstream and downstream of sampling point, estimating fluid velocity in the pipe, witness cylinder setup and removal, check if power mixing is installed.
Review that maintenance procedures are fit for purpose, are clear, understood by technicians and executed per defined schedules and in agreement with maintenace philosophy. Verify that certified test equipment is used and is maintained correctly. Verify maintenance history is captured and stored.
Review logbooks and verify that flow meter history has been captured successfully and all major events are included. This include complete information including noting down equipment serial numbers and totalisers values.
Review of system uncertainty and check tolerances in used are correct. Make sure the meter uncertainy has been re-calculated following major upgrades and that accurately reflects the current system state.
The audit steps above are general and they differ from system to system. For example, if fiscal metering skids are audited that would usually include all the steps above and, probably even more. Whilst in other cases client might want to focus on critial areas of the metering sysytems only, like the ones that are known to be causing issues recently, or in the past.
Offshore Audits - Production Platform
Onshore Audits - Terminals, Refineries, Tank Farms etc