1、 The purpose of the airtightness testing instrument is:
The airtightness testing equipment can meet the factory inspection of drilling blowout preventers, oil (gas) trees and wellhead devices, throttling and kill manifolds and other products, as well as the functional testing of the above products.
Detection principle: The airtightness tester is a universal air leakage tester, suitable for most products with airtightness requirements. This airtightness tester inputs compressed air (positive pressure) with precise pressure control into the tested container, and then cuts off the inflation circuit. If there is a leak in the tested container, the pressure inside the container will decrease. When the pressure is lower than the set pressure, the instrument will sound an alarm.
2、 Characteristics and methods of airtightness testing equipment:
1. Characteristics of airtightness testing
It is not possible to accurately determine the leakage location, but it is convenient to implement automation, with short and stable detection time, fast testing, and the tested workpiece can be kept in a dry state, and the leakage amount can be quantitatively measured.
The airtightness testing method is very suitable for large-scale testing on production lines, completely eliminating human factors. Quantitative measurement can be automated, therefore it can be widely applied.
2. Methods for airtightness testing
There are direct pressure detection method, differential pressure method, flow type leakage detection method, etc. for airtightness testing. When the internal volume of the tested parts is relatively small, pressure type detection method is more suitable. When the internal volume of the component is relatively large, flow type detection method can be considered.
Block the opening of the product, fill the interior of the product with compressed air at a certain pressure, and measure the pressure or flow rate inside the product with a tester. If the product leaks, the pressure will decrease or the flow rate will increase. Under the same conditions, when the measurement accuracy requirements of the parts are not high, the selection or relative pressure detection method can be considered; When high measurement accuracy is required for parts, the differential pressure detection method is more suitable.
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