Importance

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Abstract

A vanishing chamber type positive displacement pump is disclosed which is applicable for use as a fluid sampling device for sampling liquid or gaseous materials from pipelines or other pressurized vessels or for pumping small measured quantities of fluid from a source such as for chemical or other fluid injection. The pump mechanism incorporates a support body structure that is adapted for connection to an isolation valve such as for pipeline or pressurized vessel sampling or is adapted for direct connection to the wall structure of a vessel if desired. An elongated probe is movable connected in sealed relation to the support body structure and is capable of being inserted into the pipeline or other vessel being sampled. The elongated probe is provided with a housing at the free extremity thereof within which is located a positive displacement pump having an inlet defined by the housing which is located at the free extremity of the housing. This feature enables positioning of the inlet at an optimum sampling position within a pipeline so that interference with fluid flowing through the pipeline will be minimized. The probe and the pumping mechanism or probe transducer is also capable of being withdrawn from the pipeline and retracted into a protective environment so that it does not interfere with movement of objects such as pigs or scrapers passing through the pipeline.

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First Claim