ASME/ISO/MSS Flange
The following information needs to be entered on this screen.
Flange Type: You need to select from ANSI(ASME), MSS or ISO flange type. You will then be able to select the appropriate rating and nominal size that you require in the two boxes below.
The bolt size will automatically be selected by the program and will use imperial units for ASME and MSS, and metric for the ISO flange size. You may enter a metric for imperial bolt, or vice-versa by clicking on the "Use Metric" box and change "No" to "Yes" and then entering the metric bolt size you require.
Bolt Material: You may select from the listed bolting materials that appear from the drop down menu. The program will take account of stress relaxation factors due to temperature (when appropriate) as well as strength limitations due to bolt size.
Gasket type and Material: Select the gasket type and the material the gasket is manufactured from. The choice is either RTJ or SWG gaskets. The calculator already knows the dimensions. For other gasket types, please contact Hydratight. For more information on gasket selection please refer to Appendix 4.0.
Design and Test pressures: The values displayed are based on the maximum allowable pressures based on the Pressure-Temperature Ratings for Group 1.1. materials in the ASME 8 code. You may override these values with your own values. Enter the design or operating pressure in either Bar or p.s.i. as appropriate. At the same time the test pressure will be calculated based on a factor of 1.5 times the entered pressure. This can be altered if required to suit the particular test conditions.
Design Temperature: The value displayed is based on the maximum operating temperature allowable based on the Pressure-Temperature Ratings for Group 1.1. materials in the ASME 8 code You may override this value with your own value. Enter temperature the bolting will experience under service conditions in either degrees Centigrade or degrees Fahrenheit.
NOTE! For all bolt materials other than A193 Grade B7 and B16 materials, the software will not permit selection of temperatures above 50ºC / 122º F. For Grade B7 the software will permit temperatures up to 400ºC / 750º F, and for Grade B16 the software will permit temperatures up to 500ºC / 930º F.
The data entered on this page, together with the database and calculation programs running in the background, will be used to calculate the required bolt load to seal your chosen flange under the entered operating and test conditions. The calculations are performed in accordance with ASME 8.
Once you have entered the data you need to click on the "Calculate" button. The Calculator will now calculate the minimum load per bolt to seal the application.
You can also click between Inputs and Calculations. Inputs will display the key factors used from the information given to calculate ASME 8 load to seal.
Calculations displays the outputs from the calculation. The values displayed include the total calculated bolt loads in accordance with ASME 8. Values are displayed for the Wm1 and Wm2 conditions as well as the minimum load per bolt for the worst condition to seal. This is the value that will be used in the tightening calculations, whether torque or tension tools are to be used. The key output is the bottom value labelled "Minimum bolt load to seal based on the ASME 8 Code." This is a minimum value to be applied to each bolt to achieve a seal. Hydratight recommend this value is always exceeded to be sure of a seal.
The only further information you need enter is to choose between tensioning or torquing up this flange. If you choose tension the calculator will continue and provide you with bolting pressures for use with your selected bolt tensioners, or if you choose torque the calculator will give you the hydraulic pressure for use with the torque tool, based on your chosen lubricant.
You should now choose either "Torque" or "Tension" depending on the method of tightening you will be using for this application.
Clicking "Next" will take you to the next screen.