一、 Use of air tightness testing instrument:
The gas tightness testing equipment can meet the delivery inspection of drilling BOP, Christmas tree, wellhead equipment, choke and kill manifold and other products, as well as the functional test of the above products.
Detection principle: The air tightness tester is a universal air leakage tester, which is applicable to most products with air tightness requirements. This air tightness tester inputs compressed air (positive pressure) with precise control pressure to the tested container, and then cuts off the inflation circuit. If the tested container leaks, the pressure in the container will decrease. When the pressure is lower than the set pressure, the instrument will give an alarm.
二、 Features and methods of air tightness testing equipment:
1. Characteristics of air tightness test
It can not accurately judge the leakage position, but it is convenient to implement automation, the detection time is short, stable and reliable, the test is fast, the tested workpiece can be kept dry, and the leakage can be measured quantitatively.
The air tightness testing method is very suitable for mass testing on production lines, completely eliminating human factors. Quantitative measurement can be automated, so it can be widely used.
2. Method of air tightness test
There are direct pressure detection method, differential pressure detection method, flow type leakage detection method, etc. for air tightness detection. When the internal volume of the detected parts is small, the pressure type detection method is more appropriate. When the internal volume of the part is relatively large, the flow type inspection method can be considered.
Plug the opening of the product, fill the product with compressed air of a certain pressure, and measure the pressure or flow inside the product with a tester. If the product leaks, the pressure will decrease or the flow will increase. Under the same conditions, when the measurement accuracy of parts is not required, the relative pressure method can be considered; When the measurement accuracy of parts is required to be high, the differential pressure detection method is more suitable.
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