Orbital GasPT Technology

What is GasPT

GasPT is an online transducer that provides information regarding the physical properties of natural gas – hence the name natural-Gas-Properties-Transmitter.

What does GasPT do

GasPT provides the industry critical information about the physical properties of natural gas:
  1. Calorific Value (CV) / British Thermal Unit (BTU).
  2. Wobbe Index (WI).
  3. Relative Density (RD).
  4. Compression Factor (Z)
  5. Methane Number (MN)
  6. Total Air Requirement (TAR)
*Plus others

How does GasPT work

GasPT measures a number of easily monitored physical properties of a sample of gas from which it infers a composition. From the inferred composition GasPT uses ISO 6976 to calculate Calorific Value, Density, Relative Density and Wobbe index.

Measurement Uncertainty

The uncertainty of information of the physical properties calculated by GasPT is equal to the uncertainty when using gas chromatography. However, the speed of response will reduce the overall uncertainty. When integrated with our VE Technology® sampling system (GasPTi), the total uncertainty can be reduced to 50% of that typically available with chromatography.

How is GasPT Installed

GasPT is straightforward to install, similar to a pressure or temperature transmitter. With our VE Technology sampling system it can be installed directly on the pipeline. The electrical/data connection is provided through a safety interface, which is supplied as standard, providing certification for Zone 1 hazardous areas and for certain applications Zone 0.

The GasPT

The GasPT properties transmitter comprises twin sensor units that measure physical characteristics of the gas and transmits data to a safe area where the user can obtain and log the data, or link it to existing DCS/SCADA systems. This method is fast and efficient and makes huge financial savings for the user by eliminating the need for calibration or carrier gas or ongoing maintenance operations.

The PTi

PTi combines the advantages of VE sampling technology and GasPT’s simple and compact design. No other technology available can match PTi for speed and efficiency. Because it can be mounted directly to a VE sample probe on the pipeline, it can be installed and operated quickly and easily, with no additional infrastructure or civil works. GasPT comes with a 5-year warranty when purchased as part of a PTi system.

Orbital VE Technology

VE Technology - Sampling

VE Technology® is a suite of modular sampling products developed specifically for the Natural Gas Industry from wellhead to burner tip and all the associated processes and industries along the way.
A complete VE Technology sampling system contains just 3 versatile and cohesive products:
  1. Sampling probe with isolation valve
  2. Sample Conditioning unit – VECU
  3. Analyser Interface Module – VEAIM
VE Technology is a modular design with all the hard and clever sampling knowledge pre-engineered and taken care of at the factory.

What does VE Technology Do

It allows sampling from any and every application and connection to just about every natural gas or natural gas related analyser on the market. It achieves this level of coverage with these 3 basic products, plus linking accessories like trace heat tubing. All which are pre-engineered and supplied as part of the kit.
Most importantly VE Technology ensures a representative sample, with its IDENTITY* preserved, is delivered to your analyser of choice. It gives you the most cost efficient and safe sample in the shortest time possible meeting and exceeding standards such as ISO 10715, GPA 2116 and API 14.1.

* IDENTITY – the quality or condition of being the same in substance, composition, nature, properties, or in a particular quality under consideration; absolute or essential sameness.

What else does VE Technology® Do

In addition to providing the perfect sample to your analyser in the shortest/fastest possible time VE Technology:
  1. Eliminates Vortex Induced Vibrations, no longer do you need to be concerned about performing wake frequency calculations and limiting the insertion depth of the probe.
  2. Dynamically rejects particulates and droplets keeping your sample pathway clean like new without collecting contamination on filters or membranes that would sully subsequent samples.
  3. Provides a means for validating the entire sample pathway so you can be sure the sampling system is not affecting the results of analysis.

Probes & Sample Systems

Starting with the patented VE sample probe that eliminates vibrations and the ingress of contamination, the entire sampling system has been redesigned to deliver unparalleled safety, speed, accuracy, versatility and confidence, in even the toughest conditions.


Intelligent, low-volume, efficient designs combine VE Technology with new analyser technology to deliver integrated and ultra-fast gas sampling and analysis solutions directly on your pipeline.


Patented technology eliminates vortex induced vibration; increasing safety and reliability, removing the need for wake frequency calculations and allowing design optimisation for best available process temperature measurement.