Proving

A bi-directional prover is one of the most reliable means available to verify meter readings and establish meter factors. It is an easy and accurate way to calibrate meters in the field, in order to ensure exact measurement of liquid flow.

The principle of operation is based on positive displacement with flow and displacer travelling in both directions by means of a 4-way diverter valve. The bi-directional prover is constructed of pipe which can be configured in many ways. The bi-directional prover offers long-term reliability with minimum maintenance.

Features and benefits:

• Ability to handle various types of liquid
• Precise on-site calibration ensures low uncertainty for accurate results
• Low labour and running costs due to automation options
• Calibration using master meter or water draw
• Ability to use both neoprene and polyurethane spheres

OGS provides pipe provers with 4" to 42" measuring sections.

Our design complies with the recommendations of the following metering standards (typically):

•  API (MPMS) Chapters:
  4.2 Displacement provers
  4.6 Pulse interpolation
  13.2 Statistical concepts and procedures in measurement
• ISO 7278/BS 6866 Liquid hydrocarbons - Proving systems of meters used in dynamic measurements
• OIML RR119 - Pipe provers for testing and measuring systems for liquids other than water
• GOST requirements for proving systems

Products – Proving

OGS can supply SVP (small volume provers) that use double chronometry pulse interpolation for flow meters (turbine positive displacement, coriolis and liquid ultrasonic meters).

Key industries and applications:

• Hydrocarbon and chemical processing
• Pipeline metering terminals
• Tanker- and barge-loading facilities
• Refineries and petrochemical plants

Quick Opening Closure

Quick opening closures allow access for inspection and loading/unloading of spheres. The launch chambers are designed between 30 and 90 degree angles depending on applications.

Prover calibrations are made in the field using volume tanks. This water draw method is an industry standard which can be supplied separately or integrated with our prover skids.