Sampling system components

In order to take representative pipeline samples it is important that the product is removed at the right location and in the correct manner. Doedijns has a long history of manufacturing sample probes for various products and applications such as liquid and gas. We can provide take-off probes that can be fixed to the pipeline or retractable ones.

Doedijns can provide a range of pneumatic and electrical inline samplers suitable for pipeline diameters from 4” to 52” with pressure ranges up to 1500lbs (250barg).

A range of pneumatic and electrical fast-loop cell samplers is available from Doedijns. These fast-loop cell samplers are suitable for all pipeline diameters with pressure ranges up to 1500lbs (250barg). The 810 cell sampler is possibly the best of its kind on the market.

To prevent vibration and damage it is very important that the sample probes are designed to operate outside of the natural frequency range. It is standard practise for Doedijns to calculate the wake frequency of the probes to ensure safe operation. Our calculations are in accordance with the ASME.

Samples are collected in atmospheric receivers, PSR10 or PSR20, with a volume of 10L or 20L (other volumes available on request). Doedijns has also a range of constant pressure cylinders available for collecting products with light ends (high vapour pressures). Doedijns manufactures and supplies high pressure sample cylinders and low pressure sample cans that meet the necessary pressure vessel directives worldwide.

Just as important as the sampling system is the receiver mixing system. This very important link in the sampling chain is often overlooked. Doedijns’ mixing system for sample receivers is designed to meet the API 8.3 Standard Practice for Mixing and Handling of Liquid Samples of Petroleum and Petroleum Products.

This system enables accurate real-time analogue monitoring of collected samples. Used together with a suitable sample controller, performance calculations can be carried out in line with the API Ch8.2 and ISO 3171 sampling standards. Useful for predicting extractor failure and planning pre-emptive maintenance.

This PLC based system has been specifically designed to meet the requirements of the API 8.2 and ISO 3171 standards for automatic sampling. It covers all aspects of sampling control with the option of creating a log for future reference or disputes.