Pipeline liquid sealed sampling method

Abstract

The invention discloses a pipeline liquid sealed sampling method. The method includes the steps of: assembly of sampling equipment: preparing a sampling needle, setting a vertical through first mounting hole at the top of the sampling needle, setting a second mounting hole coaxially with the first mounting hole at the bottom of the sampling needle, arranging a first needle for liquid sampling in the first mounting hole, and mounting a second needle in the second mounting hole; and sampling: inserting the first needle into a sealed pad of a sealed sampling bottle, conducting further insertion, then inserting the second needle also into the sealed pad of the sealed sampling bottle, during collection, adsorbing the liquid passing through the first needle into the sampling bottle, and discharging the gas passing through the second needle into an activated carbon adsorber by the sampling needle. The method provided by the invention can guarantee normal sampling, prevent blockage of the sampling needle, and reduce the needle replacement cost, and also lowers the consumption of the sealed pad.

Description

technical field [0001] The invention relates to a liquid sealing sampling method for pipelines. Background technique [0002] At present, closed samplers have been used in pipe sampling of quality inspection and analysis systems in petrochemical fields at home and abroad. There are two types of airtight samplers that are most commonly used: liquid sampling and gas sampling. The container usually used for liquid sampling is a closed glass bottle, while the container usually used for gas sampling is a closed steel cylinder. [0003] At present, the current status of liquid airtight sampler sampling is roughly as follows: [0004] The material in the process pipeline is transported by the pump to the inlet flange of the liquid airtight sampler, and circulates through the pipe valve inside the liquid airtight sampler, and then the fresh material is inserted into the airtight sampling bottle through the sampling valve through two sampling needles, one thick and one thin. Sampl...

AI Technical Summary

Problems solved by technology

[0005] The needle openings of the two separate sampling needles, one thick and one thin, are obliquely cut. If they are cut into the sealing gasket of the airtight sampling bottle, two holes will be cut. The gasket will have a short service life and may be cut off. Small particles of the gasket will block the needle, once the needle assembly is blocked, the needle assembly will be replaced, which will consume a lot of cost, and more importantly, it will affect normal sampling

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