Valve Wall Thickness Testing

Valve Wall Thickness Testing

Valve wall thickness

One of the valve standard ASME B16.34 is seen as the benchmark of valve design. It includes content ratings for dimensions and other materials. It requires the specification that is based on the wall thickness in different areas of the valve bodies.

The confusion area for inexperienced valve designers is checking the correct diameter. It is based on end connections and on bore which is used in calculating the thickness of the wall. Use of dimensions. In areas around connecting to the valve bodies where holes penetrate the pressure boundaries.

Testing of valve wall thickness

Most industrial valve companies manufacture the products and standards for testing, fabrication, quality control and design. The codes include ASME B16.34, B16.5, 16.47, ASME section VIII DIV 1, ANSI FCI 70 – 2 and MSS-SP 81 and 135.

The testing of valve wall thickness depend on the following testing’s:

1.   Inner diameter

The inner diameter of the end of any steel valve is selected according with the inner diameter. The minimum diameter should be 90% of the basic inner diameter of the valve body. When checking the diameter the valve of diameter of the socket and thread is relevant and its counterbore is not taken as considerations.

2.   Valve neck

Measured thickness from the outside of the valve body that is along the direction of the valve neck. It helps in maintaining the thickness whereas inner diameter is the minimum recorded inner thickness. The required minimum thickness is recorded from the inner surface of the valve and it also comes in contact with liquid.

Valve wall thickness test and inspections

To test the valve the first thing is establishing the testing procedure that is combined with the acceptance criteria and other standards that the valve exceeds or meets. All the valves want to get inspected to make sure there is no error and leakage. Industrial valve manufacturers have to take quality assurance and inspection seriously. 

The inspector conducts the surface treatment inspection after sandblasting. Quality controls carry out the various size inspections of the blanks at the modeling. All the records will be stored and classified in the computer for inquiry at any time. 

The valve shell leakage test is a test that helps to identify the presence of water and other remaining fluids in the valves casing. The valve test is conducted by giving the valve the pressure for a specific amount of time for more than one minute and for looking for the leaks. They are all performed on all kinds of valves like stop, check and isolation types. 

It is actually conducted to maintain the process and to evaluate the health condition of the operational valve. The valve testing machine functions on high pressure includes the testing for valve leakage, seal and seat test and seat leakage inspections.

Conclusion

Valve testing techniques will change over the years and at the same time all the procedures will become more concise. To improve the performance of the valve plant it is very important to keep in mind few things. Working in this field makes sure that they are using the right techniques with enough knowledge.