Custody Transfer Measurement Skid
Fiscal measurement delivered as one tagged item: the meter run, the flow conditioning, the instrument manifolds, the transmitters and the flow computer enclosure mounted, tubed, wired and tested on a single welded frame.
Three ways the skid is built
The measurement principle sets the layout of the frame. All three are engineered against your P&ID and instrument list rather than a catalogue configuration.
Orifice Metering Skid
AGA-3 · ISO 5167-2
An orifice plate or a dual chamber fitting in a bored and inspected meter run, with upstream and downstream spools, flow conditioning where the layout is short, DP and static transmitters on manifolds, and a temperature element in a thermowell.
Plate change under pressure when a dual chamber fitting is used.
Turbine or Ultrasonic Meter Skid
AGA-7 · AGA-9 · ISO 17089
A turbine or ultrasonic meter body with the straight lengths and conditioning its calibration was established on, upstream strainer or filter, pressure and temperature instruments at the reference points, and pulse or digital output to the flow computer.
Meter calibration certificate and its K-factor supplied with the package.
Flow Computer and Instrument Cabinet
AGA-8 · ISO 6976 · IEC 60079
Flow computer, power supply, junction boxes and marshalling in an enclosure rated for the area classification, wired to the skid instruments and terminated for the customer interface. Compressibility and energy calculation configured to the specified method.
Supplied on the frame or as a separate cabinet for a control room.
What arrives on the frame
The division of scope is agreed in writing before detailed engineering starts. Anything outside it is listed as a customer interface on the general arrangement, so nothing is assumed by either side.
The general arrangement — plan, elevation, connection positions and lifting points — is issued for approval before fabrication begins.
Send us a P&ID →| Primary element | Orifice plate, fitting, venturi, nozzle or cone, sized and certified |
| Meter run | Bored spools, conditioning, straight lengths verified against AGA-3 / ISO 5167 |
| Instrumentation | DP and static transmitters, temperature element, manifolds, root valves |
| Impulse lines | Tubing, fittings, condensate pots and trace heating where the service needs it |
| Flow computer | Enclosure, power, junction boxes, cable trays and glanding |
| Frame | Welded steel base with lifting lugs, surface treatment and painting to specification |
| Testing | Hydrostatic test (pneumatic where the project specifies), leak test, loop check, factory acceptance test with witness option |
Documents
- Package: custody transfer measurement skid, [single / multi]-stream, [orifice / turbine / ultrasonic] metering, mounted, tubed, wired and tested on a single welded frame and delivered as one tagged item.
- Standards: [AGA-3 / ISO 5167 / AGA-7 / AGA-9 / ISO 17089]; compressibility and energy calculation to [AGA-8 / ISO 6976].
- Scope: primary element sized and certified; meter run with straight lengths verified; DP and static transmitters, temperature element, manifolds and root valves; impulse lines; flow computer enclosure rated for the area classification [zone, gas group].
- Frame: welded steel base with lifting lugs, surface treatment and painting to [specification].
- Engineering: scope division agreed in writing before detailed engineering; general arrangement with plan, elevation, connection positions and lifting points issued for approval before fabrication.
- Testing: hydrostatic test (pneumatic where specified), leak test, loop check and factory acceptance test, [witnessed / not witnessed].
Custody Transfer Measurement Skid
Skids are quoted from documents, not from a form. Send the P&ID, the instrument datasheets and the space you have available — that is enough for a scope split and a budget figure.