This is the documentation page for the
Bolted Flange Design module.
You'll find here everything you need to understand how to use our
Fig. 4.1.1. - Module Tab
The Bolted Flange Design module can dynamically generate the
flange drawing as the User fill the dimensions fields. It follows the
flange types and figures shown in ASME BPVC Section VIII Division 1
Appendix 2[ 1 ]. If there's some inconsistency in the
dimensions, an red warning will be shown instead of the drawing. Fixing
the inconsistency will make the drawing to be shown again.
Fig. 1.1 below show an example of flange drawing. For now, only the
frontal cross-section and top view will be shown, but we're working to
also show the bolts and gasket drawing.
For now, only International Unit System[ 2 ] or just
SI Units is accepted, but we're working to implement the
Imperial Unit System[ 3 ] in the following versions, as
it's still used by many countries and companies.
The Table below show the relationship between International and Imperial
Below is a list of all the available fields in the
Bolted Flange Design module. Not all fields are shown at once,
some fields are unique for some types of flange, as hub fields, that
only show for flanges with hub.
Other fields are shown, but can only be edited if certain condition are
met, as the material fields, which can only be edited if the User
selected the checkbox "Use your own values?".
Fig. 4.1.1. - Module Tab
Short description of the part. For example: if designing a Bolted Flange to be connected
at the upper part of the vessel, you can simply call if Upper Flange, if there's other flanges in there,
you can be even more specific, calling if Upper Left Flange or Upper Gas Flange. Just remember that
you'll use the description to identify the part (you can also use its id, but it's usually difficult to remember)
Number of decimal places to be used in the calculations and results.
User can choose between 1 to 4 decimal places (also known as precision).
System of Units
Unit system that will define the units used in all the variables in the calculation. The most known
types are Imperial System and International System. Unfortunately we still don't support changing units and
the International System will be used as a default.
For now it isn't possible to
change the System of Units, so its field will be greyed and can't be changed.
Fig. 4.2.1. - Process Tab
Fluid name, it's optional as it will not be used in any calculation. See Note (2).
Temperature of the vessel when the equipment is in service. It's optional. See ASME BPVC Section VIII Division 1
Nonmandatory Appendix C for suggested methods to obtain the operating temperature of vessel walls in service and
also UG-20 for more information.
Pressure of the vessel when it's in service. It's optional and will not be used in any calculation.
Maximum expected temperature in the vessel in normal operation. See UG-20 for more information.
Maximum expected pressure in the vessel in normal operation. See UG-21 for more information.
We are not responsible for the compatibility of the fluid to the selected material. The Fluid
field is optional and won't be used by our application. If you are unsure which material to use
with the fluid that will be stored in the pressure vessel, try accessing
types according to Figure 2-4 from ASME BPVC Section VIII Division 1.
Although 24 types are shown in the Code, we only support 22, the 2
remaining are Flanges with Nut Stops. The User will notice that some
types have exactly same information (including drawing) as other
types (it's the case of Fig. 2-4(9) and Fig. 2-4(10)) and we did
it because we wanted to stay true to the Code, letting the User selected
the figure used in the project. Other softwares decided to only let the
User choose between Integral and Loose type of flanges, without mentioning
construction type according to Figure 2-4. It can be either Integral or
Loose. There are Optional types (Figures 2-4(8) to 2-4(11)) which let
the User selected if it'll be calculated as Integral or Loose.
Flange Inside Diameter
inside diameter of flange. When it's less than 20∗g1 it will be optional
for the designer to substitute B1 for B in the formula for longitudinal
Flange Outside Diameter
Outside diameter of the flange, it's the biggest dimension of it.
Thickness of the flange, the most important variable.
Nozzle Wall Thickness
Nominal thickness of shell or nozzle wall to which flange or lap is attached
Thickness of Hub at Small End
Thickness of the part of the hub that is farther from the flange.
Thickness of Hub at Back of Flange
Thickness of the part of the hub that is closest to the flange.
Hub length, used only in flange types that have hub, as Fig. 2-4(8a) and Fig. 2-4(10a).
Flange Face Inside Diameter
Inside diameter of the face used to seat the gasket.
Flange Face Outside Diameter
Outside diameter of the face used to seat the gasket. In the drawing it's shown as a raised face but,
in fact, it can be a flat face, as shown in the Figure 2-4.
Inside Pipe Diameter
Dimension only used when User selected flange types that have pipes
attached (Fig. 2-4(2), 2-4(2a), 2-4(3), 2-4(3a), 2-4(4), 2-4(4a), 2-4(4b) and 2-4(4c),
2-4(8), 2-4(8a), 2-4(9), 2-4(9a), 2-4(10), 2-4(10a) and 2-4(11)). The sole purpose
of this dimension is to be used to draw the pipe inside de flange, it will not
be used in any calculation, so the pipe required thickness will not be calculated. If the
User want to calculate it, use the Shell & Head Design or use a standard pipe.
Lap Outside Diameter
Dimension only used when User selected lap flange types (Fig. 2-4(1),
It's up to the designer engineer to define a corrosion margin or corrosion allowance
for the project (see UG-25 from ASME BPVC Section VIII Division 1). Our application will show
the maximum allowable pressure for both conditions (new and corroded)
Use B1 instead of B
As described in the variable B above, when B is less than 20*g1, the user can use B1 instead of B for
longitudinal stress (SH)
Do you want to insert your own values?
When checked, will let User edit the fields Bolt Outside
Diameter and Bolt Root Area and will hide the fields Standard and
Bolt Size and Class.
List of standard codes for bolts and screws. When a code is
selected, the Bolt Size and Class field will load all available sizes for
the selected code.
Bolt Size and Class
List of all available bolt or screw size for the selected
Bolt Circle Diameter
Circle where bolts will be located.
Bolt Outside Diameter
Outside diameter of the bolt (do not get confused with
root diameter). This field is automatically filled when User select
a bolt size from Bolt Size and Class field.
Bolt Root Area
Root area of the bolt (don't use bolt outside diameter
to find its area). This field is automatically filled when User select
a bolt size from Bolt Size and Class field.
Number of Bolts
It's a good practice to use multiple of 4 as the number
of bolts but the application will allow any integer (decimal not acceptable).
Select Gasket from Database?
Gasket Inside Diameter
Gasket Outside Diameter
Gasket or Joint Surface Unit Seating Load
Flange Facing Sketch (Table 2-5.2)
Column from Table 2-5.2
Is the Material Normalized?
Use your own values?
Tensile Strength at Design Temperature
Yield Strength at Design Temperature
Elastic Modulus at Design Temperature
Allowable Stress at Design Temperature
Allowable Stress at Ambient Temperature
External Pressure Chart
The table above works for both Flange and Bolting material.
Minimum Design Metal Temperature
Show factors calculation?
Show flange factors equations according to Table 2-7.1 and its results
in the results page. As there's 45 equations, the results page and the calculation report
can get quite long, so we advice you to show it only if needed (for checking or when
requested by Customer)
What Test specification should be used?
Select the type of test that will be performed in the pressure vessel. It
can be according to UG-99(b), UG-99(c) or UG-100. Each option have it's own equation, so
you can't calculated according to UG-100 and perform the test according to UG-99(b).
Disable sharing of this Module?
When set to Yes, you'll be able to share this Module/Part with other
Users and they can request access to it. You can also change this option at the
Project Management module.
The Module will show messages in the results pages when needed, these
messages can be either warnings or info.
If there's any error in the calculation a red warning message (see Fig.
4.1) will be shown in the results page. The warning will have
information regarding the error to help User fix it and, if the GoTo
link is clicked, the equation with error will be shown.
Fig. 4.1 - Warning Message
The User will still be able to save the Module even though there's a
warning message. We decided to keep this way because, sometimes people
don't want to fix things right away or wan't to let other people deal
with it (just share the Module with other User using our
Project Management module)
The version comes with
some limitations which are listed below: