Sealing gaskets selection is not an easy job, especially on the gasket sealing materials, which we have to consider many factors.In the surface of flange connection space, variables seems to be endless, all these uncertain factors affecting gasket sealing effect.In the past, "TEMP" (application, medium, pressure, temperature) these parameters seem to be enough.But today, the flange of the processing quality, bolt wire embedded teeth quantity, flange, bolt tensioning amount rotation, medium filling agent ,flange surface treatment and so on all affect the effect of sealing gasket.Therefore, we shall have comprehensive consideration of various parameters to make appropriate choices.
(1) Temperature
In most of the selection process, the temperature of the fluid is the primary consideration.This will quickly narrow range, especially from 200 ° F (95 ℃) to 1000 ° F (540 ℃).When the temperature of the system operation achieves a particular maximum continuous operating temperature limit, you should choose a higher level of material.The same as at low temperature situation.
(2) Application
It is the most important parameter in the application of the types of flange bolts and use.The size of the application of bolt, quantity and level determine the payload.The effective area is calculated by gasket contact size.From the bolt load and the interface can conclude the effective gasket sealing gasket pressure.Without this parameter, we can not make the best choice.
(3) Medium
There are thousands of kinds of fluid medium, the differences of all kinds of fluid corrosion resistance, oxidation resistance, permeability and so on are very big. Materials selection must be based on these features.Another cleaning system must also be taken into consideration, in order to prevent the erosion of cleaning fluid to the gasket.
(4) Pressure
Each gasket has its highest limit pressure, pressure on the properties of the gasket with the increase of the thickness of the material is abate, the thinner of the material, the greater of the bearing capacity.Within the selection must be based on the system pressure of the fluid.If the pressure often volatile, need to understand the details in order to make a choice.
(5) PT value
The so-called PT value is pressure (P) and temperature (T) of the product. The compression capacity of each gasket material is different at different temperatures.In the general,manufacturers will offer the maximum PT.