A torque indication method for marine flange threaded fasteners

Abstract

The invention discloses a torque indicating method for a marine flange threaded fastener, which specifically includes the following steps: selecting a butterfly indicating washer corresponding to the specifications of the threaded fastener; passing the bolt through the flange hole of the marine flange , Install a butterfly indicator washer between the bolt and the marine flange; adjust the position of the bolt and the butterfly indicator washer; install the nut on the bolt, and observe the fracture of the indicator ring while tightening the nut. When the indicator ring breaks, it indicates that At this time, the tightening torque of the fastener has reached 80% to 90% of its rated torque N.M. The present invention can quickly and intuitively detect the fastening torque of the flange fastener by using the butterfly-shaped indicating washer, which improves the efficiency of on-site construction, saves the later inspection operation process, and improves the inspection efficiency of the pipeline system.

Description

technical field [0001] The invention relates to the technical field of ship building, in particular to a torque indicating method for a ship flange screw fastener. Background technique [0002] The pipelines in the marine pipeline system are usually connected and installed with flanges. According to the corresponding design requirements of the pipeline system pressure, temperature, medium, etc., install bolts and nuts on the flanges and tighten them (according to the diameter of the marine flanges) , the thread diameter used is M27~M56mm), in order to prevent leakage at the flange connection, the tightening torque of the bolts and nuts needs to be inspected, usually the tightening torque of the fasteners should reach 70% to 100% of the rated torque %N.M. [0003] The traditional method usually uses a torque indicating wrench to check the tightening torque of the fasteners to indicate that each pair of threaded fasteners has reached the same and rated torque to ensure the no...

AI Technical Summary

Problems solved by technology

[0006] 1. The construction space is limited, and it is impossible to inspect each pair of flanges one by one after the piping system is connected;

[0007] 2. Under different construction stages and working conditions, different torque indication methods for threaded fasteners (torque indication wrench, secondary tightening of bolts and nuts, etc.) are required. The technical requirements for operators are relatively high, and a unified and intuitive method is lacking. The torque state judgment method;

[0008] 3. The installation of pipeline flanges is carried out by different construction personnel, and there is a lack of effective and intuitive inspection methods during the installation of fasteners, resulting in the failure of threaded fasteners to meet the torque requirements after installation

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