FAQ

What is the Sealing Gasket

2019-08-31

What is the sealing gasket:

Sealing gasket is a kind of sealing spare parts used for machinery, equipment and pipelines as long as there is fluid. It uses internal and external sealing materials. The gasket is made of metal or non-metal plate material, which is made by cutting, stamping or cutting. It is used for the sealing connection between pipes and the sealing connection between the machine parts and the machine parts.

Such as :spiral wound gasket ,PTFE gasket ,non-asbestos gasket ,insulation gasket kit ,rubber gasket etc.

How to select the gasket

Important Factors Affecting the Selection of Gaskets Gasket selection is not an easy task, especially in the selection of gasket sealing materials. The variables that appear at the flange joints seem to be endless, and all of these uncertainties affect the sealing effect of the gasket. In the past, the parameters "TEMP" (temperature, application, medium, pressure) seemed to be sufficient. However, today, the processing quality of the flange, the amount of bolt thread insertion, 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, various parameters must be considered in order to make appropriate choices.


(1) Temperature
In most types of selection, the temperature of the fluid is a primary consideration. This will quickly narrow down the selection, especially from 200°F (95°C) to 1000°F (540°C). Higher levels of material should be used when the system operating temperature reaches the limit of the maximum continuous operating temperature of a particular gasket material. This should also be the case at certain low temperatures.


(2) Application
The most important parameters in the application are the type of flange and the bolts used. The size, number and level of bolts in the application determine the payload. The effective area to be compressed is calculated from the gasket contact size. An effective gasket seal pressure can be derived from the load of the bolt and the contact surface of the gasket. Without this parameter, you won't be able to make the best choice among the many materials.


(3) Medium
There are thousands of fluids in the medium, and the corrosive, oxidizing, and permeability of various fluids are very different. Materials must be selected based on these characteristics when selecting. In addition, the cleaning of the system must also be taken into account to prevent the cleaning fluid from eroding the gasket.


(4) Pressure
Each gasket has its highest ultimate pressure, and the pressure resistance of the gasket decreases as the thickness of the material increases. The thinner the material, the greater the pressure bearing capacity. The selection must be based on the pressure of the fluid in the system. If the pressure often fluctuates drastically, you need to know the details to make a choice.


(5) PT value
The so-called PT value is the product of pressure (P) and temperature (T). The material's pressure resistance is different at different temperatures and must be considered comprehensively. In general, the manufacturer of the gasket will give the maximum PT value of the material.