Carbon steel flange with the rapid development of domestic and international long-distance pipeline construction, pipeline pressure
test to become an important part of the essential, before and after the pressure test on each pipeline must pass the ball sweep line,
the number of 4 to 5 times . Particularly after the pressure test the water in it is difficult within the pipeline cleaned up, sweeping
the number will be more. Construction methods repeat the welding head, received the ball, and its problems: First, to increase the labor
intensity; is repeated welding head method supplies required number of large equipment and high cost. Repeated welding head method, the
labor intensity of the tee for long-distance pipeline pressure test to pass the ball sweep line, supplies, required a large number of
equipment and the problem of high costs, a new Simple fast opening large flange blind flange construction method. The construction
method of the Quick Opening Closure structure, working procedures and strength check. In the astringent ninglam gas pipeline project on
the application, proof of Quick Opening Closure construction method than repeat the welding head construction methods to improve
ergonomics three times, not only reduce the labor intensity, but also reduces the cost. Carbon steel flange needs to be done a certain
amount of preparatory work prior to the measurement, according to certain ways and means of measurement, according to the specific
situation to determine the different measurement methods to ensure the accuracy of measurement.
Here are some methods of measurement of carbon steel flanges: preparatory work before the measurement:
Before measuring the location of the large flange, the first should draw the device to connect the large flange sketch and numbered
consecutively, in order to fixture installation checkmark be installed in accordance with certain methods and principles to ensure the
normal use.
Because the installation, carbon steel flanges may be different outside diameter, in the wrong mouth (different heart), the shim
thickness is not equal to the situation, the processing out of the fixture should be corresponding to the side of the carbon steel
flanges are not interchangeable, so measuring the size and number of ministries fixture processing and installation of the key.
3 measurements, the best arrangements for three people, two of them measuring a proofreading and fill in a form of measurement tools
with a vernier caliper, and if there are no conditions available outside calipers and steel ruler. Measurement is a meticulous work, is
a prerequisite for fixture installation , measuring and recording must be prepared to correct when completing this form must be
carefully clear of each other with the actual measurements, the correct principle of co-operation and use.
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