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5 comments
Anonymous Poster #1

Bolt Length / Max Projection Required as Per Flange Class

05/17/2012 2:33 AM

good morning guys,

is there any design procedure or reference define the max.no. of bolt`s threads to be left as a projection out of the flange accordingly with it`s class ? most of what i found ranges between 1.5 and 4 threads but up to which size 1.5 threads can be used ? and starting from which size 4 threads can be used? and if the class goes higher and this is the basic question will these values change ? ( take and example of # 150 and #300 flanges )

regards

MR.J

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Anonymous Poster #2
#1

Re: bolt length / max projection required as per flange class

05/17/2012 7:25 AM

Plz expline in details, I am not understand.

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Active Contributor

Join Date: Nov 2011
Posts: 23
#2
In reply to #1

Re: bolt length / max projection required as per flange class

05/17/2012 9:21 AM

ok , in brief i want to know what is the max. projection in both flanges of classes 150 and 300 , i know it differs as the thickness of the flange it self differs for course from one class to another , the question here regarding the limitations , how many mm you leave as protrusion for the bolt out of the flange in the mentioned flange classes ,

hope i make it simple not more complicated.....

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Guru

Join Date: Jan 2011
Posts: 673
Good Answers: 3
#3

Re: Bolt Length / Max Projection Required as Per Flange Class

05/19/2012 1:54 AM

three treads showing is the norm. if you need to install longer bolts "for what reason is beyond me". the bolt shank must be less than the total width of the connection minus torqued bolt stretch. clearance should be considered.

you question is very questionable.

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Power-User
Engineering Fields - Piping Design Engineering - New Member Engineering Fields - Mechanical Engineering - New Member

Join Date: Aug 2008
Location: Europe
Posts: 289
Good Answers: 27
#4

Re: Bolt Length / Max Projection Required as Per Flange Class

05/23/2012 2:55 AM

Mr J,

There is no standard with regards to the maximum length. The primary issues which one must consider include accessibility, maintainability and cost. Longer fasteners are more expensive, may impede placement of tools and are susceptible to mechanical damage and corrosion. The important thing is full engagement of the nut onto the stud/bolt.

In critical applications it is not unusual to see the equivalent of at least one fastener diameter extending beyond the nut. This configuration is necessary when bolt tensioning rather than bolt torquing is the tightening method.

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Guru
Engineering Fields - Piping Design Engineering - Retired Piper

Join Date: Feb 2007
Location: Bayonet Point, Florida
Posts: 602
Good Answers: 51
#5

Re: Bolt Length / Max Projection Required as Per Flange Class

05/23/2012 8:27 PM

Anonymous Poster #1

This chart might be of help you also:

http://www.engineeringtoolbox.com/forged-flanges-studs-d_1015.html

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Anonymous Poster (1); BoltIntegrity (1); durtieduck (1); PennPiper (1); pilot joe (1)

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