Measuring Pressure and Temperature in the Maritime Industry

Ametek Calibration offers a complete program of maritime DNV approved temperature, pressure, and signal calibrators and pressure generators. Their complete systems include hand held pneumatic and hydraulic pumps, temperature calibrators, digital pressure gauges, and a range of hoses and fittings for your calibration requirements. Ametek Calibration even provides equipment which only needs recalibrating every three years, decreasing the overall cost of ownership by 67%.

Measuring Pressure and Temperature in the Maritime Industry

Maintain and calibrate monitoring devices for:

  • Servo oil propeller pitch
  • Feed water
  • Hydraulic systems
  • Main steam
  • Cooling water outlet
  • Turbo-charger lubrication
  • Safety valves
  • Lubricating oil systems
  • Cylinder / piston / fuel valve cooling medias
  • Oil burner
  • Fuel oil inlet
  • Scavenge air
  • Exhaust gas
  • Sea water cooling
  • Thrust / shaft plane / stern tube bearings
  • Generators
  • Steam
  • Purifiers
  • Refrigeration systems
  • Starting air
  • Gland steam
  • Condensing system
  • Condensers
  • Uptake gas

General Calibration and Maintenance

Pressure gauges, pressure and temperature transmitters, regulators, electronic sensors, transducers, valves, and temperature and pressure switches must to be checked and calibrated periodically.

Torque/Tensioning/Force

It is possible to use the special custom engineering unit, and read directly in ft/lbs, N m, or any other customized unit when utilizing hydraulic pressure for tensioning and lifting.

Pump Testing

To characterize the pump the nVision observes inlet and outlet pressures and records from two pressure sensors, up to 15 000 psi, as quick as 10 times per second.

Relief Valve and Rupture Disc Testing

Rupture discs and pressure safety valves protect pressure vessels and piping systems from excessive internal pressure. Periodic adjustment and testing of this equipment are crucial to ensure overall safety. Ametek Calibration equipment catches the maximum pressure at high speeds (up to 10 readings per second) to complete and document the tests.

Filter Testing

The nVision can calculate and record differential pressure at high static pressure directly across a filter. A customer can save money by replacing filters only when needed by estimating a filter's relative age and wear in this way.

Exhaust Thermometers

Check and adjustment of engine injection systems and their exhaust thermometers. They are used to optimize fuel consumption, and to adhere to the requirements from classification societies.

Tank Level

Producers store their inventory in holding tanks, and an accurate temperature and pressure calculation of each storage vessel generate a record of their inventory on-hand. The MTC measures and calibrates temperature and the nVision provides a quick and easy way to record accurate pressure measurements.

Wellhead Testing

Located offshore, wellheads give the pressure interface for both drilling and production equipment. Ametek Calibration gives unmatched accuracy to test and record pressures on the wellhead up to 15 000 psi / 1000 bar.

Tubing and Casing Pressure Graphing

To make the proper alterations to wells, operators must record a well’s casing and tubing pressure at the same time. By utilizing an Ametek Calibrations reference recorder, these tests can be performed on the surface, saving both time and money. The nVision can store 500,000 readings, and can record two pressures simultaneously at up to 10 times per second.

Barometric Pressure Measurement

A number of applications, like calibrating absolute pressure gauges, will need the reference gauge to read directly in barometric pressure. The nVision and the HPC40 series, with the optional barometric reference will show pressure in the absolute scale. You can even toggle between gauge and absolute pressure using the same device.

Custody Transfer

Accuracy is of the utmost importance when transferring oil or gas to or from a ship. The high accuracy PKII is the de-facto standard employed in gas measurement. The nVision also adheres to the custody transfer required accuracy of ± 0.025%. Temperature is also an key factor in precise flow calculations, in addition to pressure. The RTC-157, with its active dual zone heating technology, together with a reference probe can measure ± 0.07 °F (0.04 °C).

Datalogging/Data Recording

Record temperature, pressure, current, and voltage at up to 10 readings per second by using the nVision. It has a battery-optimizing, Ultra Low Power (ULP) mode, which enables the user to take an entire year of continuous recordings on one set of batteries.

Direct Pressure Measurement

A number of locations throughout oil and gas facilities will need direct measurement of pressure. This could involve either mounting an instrument permanently or performing periodic checks. Instrumentation from Ametek Calibration provides the flexibility and accuracy to measure pressure with confidence.

Calibrating Tank Sensors

Extra care must be taken when choosing a temperature calibrator if temperature sensors are mounted in hard to reach locations and they require calibration at very low temperatures. A portable RTC-157 B can be taken to the hard to reach spot, and can cool down to -45 °C.

Chart Recorder Replacement

The nVision is an excellent replacement for aging chart recorders. It provides more accuracy in a smaller, lighter, and more robust package, whilst also saving data in an electronic format. It has been proposed that one 10,000 psi nVision could replace most chart recorders, as they rarely have better than 1 psi resolution.

Transmitter/Flow Computer Calibration and Validation

Static and differential pressures, in addition to temperature, are frequently measured to calculate flow by using transmitters and flow computers. Calibration and validation is required to confirm their accuracy.

The nVision permits a user to complete pressure calibration and validation of a differential transmitter, and the temperature component can be calibrated by using temperature calibrators, the ASC-400 and CSC201 from Ametek Calibration simulates the process to the flow computer.

Maintenance of Calibration Standards and Test Equipment

Test equipment and portable calibrators require periodic checks and calibration. Having local standards on site for calibration of these instruments provides savings in cost and downtime of instruments: calibrate the field instruments locally and then only send the standard in for regular calibration. The HPC40 Series and nVision are light-weight, small, instruments that have the accuracy needed to calibrate pressure in the field or in a lab.

The RTC and PTC series are excellent standards for the verification and calibration of handheld thermometers. The DTI Series with an STS may be used as high accuracy temperature references. The AMC-910 offers capabilities for local calibration of electrical signals and with the APM CPF and an STS probe may be used for pressure and temperature calibration.

There is no better pressure standard than a deadweight tester for calibrating pressure instruments and the deadweight testers from Ametek Calibration are designed to be highly accurate but durable.

This information has been sourced, reviewed and adapted from materials provided by AMETEK Sensors, Test & Calibration.

For more information on this source, please visit AMETEK Sensors, Test & Calibration.

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