Insulation Bolting Sets

Just a discussion really, rather than a problem

I've got a flanged spec and in some instances there will be a requirement for an Insulation Bolt and Gasket set.

NEW bolting btw

The bolts are the standard inspec items but need an additional allowance to take account of the insulation washers, the normal washers (that the standard bolts don't have) and a gasket a couple of mm thicker than the standard. This may or may not cause the bolt length to jump up to the next size in the bolt length table

Now I don't want to go down the route of alternate flanges that call out a different BLRFARRA, along with an alternate XTRA value (although this would work)

Another possibility (and I'm thinking that this may be the best way right now) would be to have an alternate gasket with the thickness set to the thickness plus an allowance for the washers. This will work, will calculate the correct bolt length, however will also end up sticking a 1/2" seperation distance between flanges that may look a bit odd.

So I was wondering if the community had got any other methods of implementing a insulation gasket set that are a touch better than my two suggestions.


best regards

Thought I had covered this before but I can't find the post.
The answer is to use 2 SBOLs
One for your standard bolt and a second for the Insulation bolt.
Add the additional lengths for washers etc to the XTRA of BITL of the second SBOL.

In the BOLT spec you have an entry for standard bolt with BSEL set to DEF    and BLTREF to the standard SBOL
Make a second entry identical to the previous but with a :suffix to the speco name and BSEL set to ISO  (or whatever) and BLTREF set to the Insulation SBOL

Make sure that you set the Deault BSEL to DEF in the spec header.


HEADING
TYPE  NAME          BDIA   BTYP  BSEL  SHOP  CATREF  DETAIL                                        MATXT                     CMPREF  BLTREF
DEFAULTS                                                                                          
-     -             -      BOLT  DEF   =                                                          
BOLT  */BBWMSCCD    12.70  BOLT  DEF   FALS  /BOLT   /STUDBOLT.+.2.HVY.HEX.NUTS.ASME.B1.1/B18.2.2  /ASTM.A320.GrL7/A194.Gr4  =0      /BBWMSCCD
BOLT  */BBWMSCCD:I  12.70  BOLT  ISO   FALS  /BOLT   /STUDBOLT.+.2.HVY.HEX.NUTS.ASME.B1.1/B18.2.2  /ASTM.A320.GrL7/A194.Gr4  =0      /BBWMICCD

In design where you require insulation sets you set the BSEL  of the Flanges Valves , wafers,etc to ISO (or whatever)
This switches Isodraft to the Insulation Bolt for the length calculation

 

See ISODRAFT User Guide    Bolting
4.8 Administrative and Geographical Use of Selectors

Cheers,

another one for the armoury

unfortunately the search facility on this forum is less than brilliant.

Perhaps due to the lack of tags added to some posts.

Same method can be used for
switching SHOP/FIELD delivery
Switching between STUDBOLT and MACHINE bolt for particular joints

Of course you are still depending on the Designers to "Flick the switches"

Thanks for posting this. It was very helpful for me. I spent a few unsuccesful hours yesterday trying to figure out how to do this.

about new method
how if the assemblies was flange+gasket+valve+gasket+flange ,only one flange will had more extra length then others.
how to switch?
i tried this two flange will have the same length of bolt.

Please can anyone give a advice