How can you guarantee, prove and certify that a sampling system complies with the standards?
A sampling system needs proving once installed. Only then can you certify that a system performs as specified. The only way to prove beyond doubt that an installed sampling system complies with the standards is to prove the system by water injection. The procedure is defined in the standards.
The vendor or purchaser can prove the system, and this process can be witnessed and certified by one of the inspection/certification companies.
When designing or specifying a sampling system a key point of consideration would be to ensure that the system performance will be guaranteed if the system is proved by water injection in accordance with the standards.
Once a system has been proved by water injection it is only necessary to re-prove the system if either the fluid properties or the process conditions change provided the system is regularly serviced and the performance monitoring system is functioning correctly.
