High-pressure resistant rubber soft joint tear test
pendulum tear tester, the test cloth sample is fixed between two jaws, one side is movable and the other side is a fixed structure, the moving jaws are in contact with the The influence of gravity can cause the pendulums to fall together. The pendulum provides the force to tear the fabric during the test. This instrument consists of the following components. A sturdy frame is used to support the pendulum and fix the clamp, as well as a cutter and measuring tape for incision. The installation should be level and prevent movement during the test. , a pendulum that can swing freely along a horizontal bearing, that is, the pendulum is raised to the starting position (the pendulum stops) and released immediately, a mechanical or electric device used to measure the large amplitude of a swing, that is, used to tear cloth Such a large capacity can directly give tearing readings. The movable jaw is integrated with the pendulum. The fixed jaw is integrated with the frame. The distance between the jaws is 3 ± 0.5 mm so that the knife edge can pass through and the cloth sample is placed. After inserting the clamp, make it parallel to the rotating axis of the pendulum. This plane forms an angle of 27.5 ± 0.5° with the vertical line of the rotating axis. The distance between the rotating axis and the upper edge of the clamp is 104 ± 1 mm. The clamp surface size of clamp is not Exact regulations, the width is generally 30-40 mm and the height is 20 mm, but not less than 15 mm are suitable. Use a sharp blade to cut the cloth sample between the two clamps before tearing it. A 20 ± 0.5 mm incision, use equipment for cutting cloth samples, and cut the appropriate template for cloth samples according to the dimensions shown in Figure 1
Conditions for balancing and testing of high-pressure rubber soft joints
Climatic conditions for balancing and testing, etc. are described in accordance with ISO 139
6 . Test report
6.1 The test report shall include the following information
a) Parts related to EN ISO 13937 and the date of the test
b) Evidence of the test fabric sample and the sampling procedure (document the sampling procedure if necessary)
c) Measuring range used
d) Test The number of fabric samples and the number and reasons for rejection
e) Observation of abnormal tear behavior
f ) Any deviation from the given procedure
6.2 High pressure resistant rubber soft joint test results
a) Tear force in warp and weft directions Average, expressed as N. If only 3 or 4 test fabric samples are correctly torn, record the tear force results of the correctly torn fabric samples separately
b) If required, record the coefficient of variation of the tear force , using The percent sign represents
c) If required, record the 95% confidence interval of the tear force, and use N to represent
d) If required, record the minimum and maximum values of the tear force in each direction, and use N to represent
rubber soft joint Design of pipelines under high temperature and high pressure
Through stress calculation of already laid out pipelines, the maximum stress points and maximum stress values of the piping system are calculated, so that they are within the specified allowable range, and the pipes connected to the equipment are calculated The force, moment and displacement of each support and lifting point can be calculated within the allowable load of the equipment pipe mouth, so as to control a certain displacement and provide a basis for the design of the pipe frame.
With the development of industry, a large number of high temperature, high pressure, large diameter, large wall thickness rubber joint pipeline applications, the design of pipelines becomes more and more important. Pipeline stress analysis has also received more and more attention from design units and investors. Especially in some foreign investment projects and national projects, design units are clearly required to provide pipeline stress analysis calculation sheets. Pipe stress analysis is the basis of pipeline design. It studies the forces, moments and stresses generated by pipelines under various loads, evaluates the stability of pipelines, and makes the designed pipelines as economical and reasonable as possible
