Technical capability
Engineering, procurement, integration, testing and commissioning of gas and liquid measurement systems for refineries, export stations and process facilities.
Sanat Khat va Palayesh (SKP) provides engineering, procurement, integration, testing and commissioning services for gas and liquid metering systems used in refinery, transmission and export applications. A metering system is delivered as an engineered package: meter runs, valves, instrumentation, flow computers, panels and cabling, and the associated control logic, all tested and handed over as one system.
SKP's documented experience includes the export gas metering stations to Turkey, Armenia and Iraq, the Shazand oil metering and proving skid, and the metering systems for the Ilam, Parsian, Shahid Hasheminejad and South Pars No. 10 gas refineries.
Fiscal measurement systems that set the quantity on which two parties settle, and which have to stand up to inspection by both of them.
Gas measurement packages built on orifice, ultrasonic and venturi technologies, with pressure regulation and the in-line equipment the meter depends on.
Measurement systems for crude oil and process liquids, with the means of proving meter accuracy in place.
The calculation, recording and supervisory layer that turns a meter output into a record somebody can rely on.
The pressure, temperature and quality measurements the accuracy of the whole system rests on.
Turning a set of equipment into a proven system before it reaches site.
Inside the package
Rotate and inspect an interactive 3D model of the ethane metering skid SKP is engineering for Jam Petrochemical Company, built from the project's own general-arrangement drawings: three Coriolis metering runs on one frame — duty, standby and master — with the crossover that puts the master meter in series to prove the stream in service. Follow the gas through it, or pull the package apart into the disciplines that build it.
Read the project record
Drag to orbit, scroll to zoom. Choose a number to fly to that equipment.
Modelled from SKP's own general-arrangement engineering for this skid and simplified for the web. Arrangement and proportions only — no drawing, tag or process data is reproduced here.
The path a stream takes from inlet to outlet, and what is measured at each stage and why. This is the process view; the control-system view is the architecture drawing on the measurement solutions page.
Direction of flow
On every skid
The stream enters through double block and bleed isolation. Two seats with a vent between them let the skid be positively isolated and proved leak-tight without breaking into the line, which is what makes maintenance and proving possible while the pipeline stays in service.
No skid carries every stage. Conditioning, proving and sampling are added when the meter technology, the fluid and the contract call for them, and left out when they do not. The order above is the sequence a stream passes through; which stages are present, and what sits in them, is a design decision taken per application.
On every skid
The stream enters through double block and bleed isolation. Two seats with a vent between them let the skid be positively isolated and proved leak-tight without breaking into the line, which is what makes maintenance and proving possible while the pipeline stays in service.
Instruments: Inlet block valve, double block and bleed · Bleed and vent connection · Local pressure indication
Depends on the meter type
How much conditioning a stream needs is set by the primary element, not by habit. An ultrasonic or orifice gas meter is calibrated on a fully developed, swirl-free profile and needs a filter, a flow conditioner and defined straight lengths upstream and down; deliver anything else and it reads consistently, but wrong. A Coriolis meter is not profile-sensitive in the same way and needs far less, though liquid duty still wants strainers and air elimination. The arrangement follows the meter.
Instruments: Filter separator on gas · basket strainer and air eliminator on liquid · Flow conditioner · Upstream and downstream straight lengths · Differential pressure across the filter
On every skid
The primary element measures the flowing stream. Which one depends on the service: multi-path ultrasonic or orifice on gas, Coriolis on liquid where mass is the quantity that matters. Runs are arranged in parallel so one can be taken out for proving or maintenance while the others carry the duty.
Instruments: Ultrasonic meter, multi-chord · Orifice plate and differential pressure transmitter · Coriolis mass meter · Meter run isolation
On every skid, but not the same instruments
Flow is measured at line conditions and settled at reference conditions, so the correction has to be measured too. A gas run takes pressure and temperature at the meter. A Coriolis meter already reports mass and density directly, so it needs no pressure correction for quantity — temperature still matters, and a densitometer appears where volume at reference conditions is what the contract asks for.
Instruments: Pressure transmitter at the meter · Temperature transmitter, RTD in a thermowell · Densitometer on liquid duty
Depends on the service
Quantity alone does not settle a custody transfer — composition does. A take-off on the same stream feeds a gas chromatograph or an automatic sampler, so the heating value, or the water and sediment content, belongs to the flow actually measured.
Instruments: Sample probe in the metering run · Gas chromatograph · Automatic sampler and receiver
Depends on the application
A meter is only as good as its last proof. A master meter or prover loop compares the working meter against a reference under the same conditions, and the resulting meter factor is applied by the flow computer. This is the branch that turns a measurement into a defensible one.
Instruments: Master meter run · Prover connections and four-way valve · Meter factor applied at the flow computer
On every skid
The flow computer takes the primary signal together with pressure, temperature and composition, computes corrected volume and mass, and totalises continuously. Calculations follow AGA, API MPMS and ISO; pulse integrity checking makes a lost or spurious pulse detectable rather than silent.
Instruments: Flow computer per run · Supervisory station and reporting · Dual-pulse integrity to API MPMS Ch. 5.5
Depends on the duty
A control valve holds the operating point — flow rate, or back pressure high enough to keep the stream single phase across the meter — and outlet isolation returns the stream to the line. Control sits downstream so its turbulence is never in front of the measurement.
Instruments: Flow or pressure control valve · Outlet block valve · Non-return protection where the duty needs it
Interactive 3D models showing two of the measurement principles behind our gas and liquid metering systems. Drag to rotate, and use See inside to look past the case.
Loading model
Fluid is divided between two tubes that are vibrated in opposition. Mass passing through twists them out of phase, and that twist is the measurement: mass directly, with density read from the resonant frequency of the same tubes.
The projects below are SKP's documented experience in gas and liquid measurement systems.
EPC delivery of a quantity-and-quality gas metering station at the Naftshahr border point.
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EPC delivery of an export-gas metering station near the Aras River, including the main station and a temporary metering facility.
Read MoreIllustrative imageRedesign, procurement, installation, testing and commissioning of gas-metering systems to improve compliance and measurement configuration.
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Completion, refurbishment, and commissioning of the metering, proving, and automatic sampling systems at the Shazand Oil Transfer Center, including equipment calibration, control system modifications, workshop and site testing, and final handover.
Read MoreGet in touch for a technical enquiry, a tender, or a review of the scope of a measurement package.
Contact SKP