Pipe technical parameters

November 09 14:01:09, 2024

Function parameter

They are the main functional indicators of metal bellows type elastic components and are important criteria for determining whether bellows components can be applied. In addition to a given rating, such parameters are given a tolerance range (limit value) to ensure the reliability of the use of the elastic component.

Quality parameter

These parameters are not involved in the use of metal bellows components, and are only measured directly in the performance and quality assessment of elastic components. Based on the test results, the function, quality, failure, and reliability of the component are determined.

Load

Various expected load values ​​acting on metal bellows and other elastic components, such as concentrated force F, pressure p, and moment M. In the case of metal bellows type elastic elements, in addition to the given applied load value, the direction of action and the position of action of the load must be given. For pressure loads, it is also stated that the elastic element is subjected to internal cavity pressure or external cavity pressure.

Nominal load

The maximum load or full scale value allowed for metal bellows and other elastic components under normal operating conditions. It is usually the expected design value, or a design value that has been modified after the prototype has been physically tested.

Overload load

The specific elastic component product is subjected to an instantaneous load or a test period during which it is allowed to exceed the rated load without damage, failure, and load bearing capacity at the time of instability. For instrument elastic sensitive components, the overload capacity is generally limited to 125% of the rated load. Bellows components used in engineering are generally limited to 150% of rated load. According to the engineering requirements, when a large safety factor is required, the elastic component used does not allow any overload, so the load must be less than or equal to the rated load.

Displacement

The position of a metal bellows and a particular point (free end or center) in the elastic element changes. According to its motion trajectory, it can be divided into line displacement and angular displacement. Under the action of external load, the metal bellows may produce axial displacement, angular displacement and lateral displacement.

Rated displacement

The displacement values ​​caused by the metal bellows and the elastic members under the rated load, that is, the working displacements they are allowed to produce under normal use conditions.

Overload displacement

All types of elastic components are allowed to withstand the rated displacement at the moment of operation or during the test. In the event of overload displacement, the elastic element should not be damaged, failed, unstable or the like. For instrument elastic sensitive components, the overload displacement is generally limited to 125% of the rated displacement. The bellows components used in the project should be determined according to the engineering conditions and safety level.

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