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How should the gasket be selected? What parameters need to be considered?
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-11-24
Visits:
The selection of gaskets is usually based on industry requirements or known flange standards, to determine the gasket standards, the power industry generally requires the use of Chinese national standards;
According to the system requirements, determine the nominal diameter and nominal pressure of the gasket;
According to the medium temperature, pressure, corrosive performance and other requirements to determine the type of gasket, material and model.
The processing quality of the flange, the amount of bolt thread embedded, the amount of flange rotation, the amount of bolt tension, the filler of the medium and the surface treatment of the flange all affect the sealing effect of the gasket. Therefore, the choice of sealing gasket
There are many factors to consider, especially in the choice of gasket sealing material. The variables that appear at the flange connection seem to be endless, and all these uncertainties may affect the sealing effect of the gasket.
fruit. A combination of parameters must be considered in order to make an appropriate choice.
Figure 1: Gasket Source: Dankai
1. Medium
There are thousands of kinds of fluids, and the corrosive, oxidizing and permeability of various fluids are very different. The selection of materials must be based on these characteristics. In addition, the cleaning of the system must also be considered.
In order to prevent the cleaning fluid on the gasket erosion.
2. Temperature
In most selection processes, the temperature of the fluid is the primary consideration. This will quickly narrow the options, especially from 200 °F (95) to 1000 °F(540). When the system operating temperature reaches a
At the limit of the maximum continuous operating temperature of a particular gasket material, a higher level of material should be selected. This should also be the case at some low temperatures.
3. PT value
The so-called PT value is the product of pressure (P) and temperature (T). The pressure resistance of each gasket material is different at different temperatures and must be considered comprehensively. In general, the manufacturer of gaskets will
The maximum PT value of the material is given.
4, the pressure
Each type of gasket has its highest limit pressure, and the pressure bearing performance of the gasket decreases with the increase of material thickness. The thinner the material, the greater the pressure bearing capacity. Selection must be based on the pressure of the fluid in the system. Such
If the pressure often fluctuates violently, you need to know the details in order to make a choice.
5. Application
The most important parameters in the application are the type of flange and the bolts used. The size, number and grade of bolts in the application determine the payload. The effective area to be compacted is through the gasket contact size gauge
worked it out. The effective gasket sealing pressure is derived from the bolt load and the gasket contact surface. Without this parameter, you will not be able to make the best choice among many materials.
In addition, before installing the gasket, the surfaces of the gasket and the flange must be cleaned, the scratches on the gasket surface must be inspected, and the dimensions, materials, bolts and other details of the gasket must be inspected according to regulations.
Check, the surface of the dirt should also be strictly cleaned. Before installation, judge the roughness of the flange surface and the parallelism of the sealing surface to see if it is in harmony with the type of gasket. The gasket should be installed.
The position is correct. In order to obtain more accurate bolt stress, auxiliary tools such as torque wrench should be used.
After the gasket is installed, the working condition of the gasket should be checked regularly or irregularly. Especially after the working environment changes, the gasket should be upgraded in time according to the specific requirements.
The gasket with stress relaxation and leakage should be replaced in time or upgraded to a gasket with higher strength.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
Selection, Gasket, Pressure, Flange, Selection, Bolt, Material, Must, Consider, Seal
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