Design Options – General Tab
The below dialog is opened when selecting the options button on the heat exchanger data sheet. The dialog has various tabs which allow the user to set the relevant data for the heat exchanger.
The dialog is normally filled with default values. These values have been developed based on many years of experience in the industry and can be used for a first estimate of the heat exchanger. For example the confining height and depth values are based on general fabrication practices.
Figure Design options – General
- The 'TEMA minimum' is checked when the minimum values of the TEMA need to be observed for wall thicknesses of shells and heads. This can be unchecked if for instance the UHX of the ASME VIII div1 is used as calculation basis. If this option is on: The shell barrel and channel thickness will be designed starting with a minimum thickness according TEMA section 5 RCB-3, and the diameter and design pressure are checked against there maximum values from TEMA
- The software uses some small extra design margins for flanges and tubesheets. If this options is selected the the program will use the exact calculated figures. All design sizes are not rounded to the nearest integer values. This options is for special cases for which it is important to known the exact required wall, flange and tube sheet thickness
The general flange parameters are illustrated in below figure 'Flange hub design'
Figure flange hub design
- The confining height of a flange is indicated by number 1
- The confining depth of a flange is indicated by number 2
The general tubesheet parameters are illustrated in below figure 'Spacing and confining dimension tubesheet and flange'
Figure spacing and confining dimension tubesheet and flange
- The spacing confining diameter flange and tubesheet is the difference between the arrows indicated by number 6 and 7
- The confining height tubesheet large diameter is indicated by number 3
- The confining height tubesheet small diameter is indicated by number 1
- The minimum confining width near bolt hole is illustrated in figure 'Flange hub design' with number 3
The floating head flange or dished cover can be set separately for the confining width near the bolt hole, refer to figure 'Dished cover'
Figure 'Dished cover'
- The minimum confining width near bolt hole for a dished cover or floating head flange is indicated by number 1
Figure 'Flat cover'
- The groove depth is illustrated with number 4 in figure 'Flat cover'
- The miscellaneous weights are the user defined weight for auxiliaries such as name plate, name plate bracket, earthing connections, lifting lugs and others
- The head type can be set and will be used for both ends