100% Collar bolt requirements for Removable Bundle in Shell and Tube Heat Exchanger?

[mrudulv08]

Dear All,

Presently, we are going on with design checking for several U tube Heat Exchanger.

In the previous revision of the datasheet, we have asked our Contractor to Provide collar bolts to keep bundle in position with shell when the Channel is removed.

My question is how Many collar bolts shall be provided and is there any code/standard basis for deciding no. of collar bolts?

Our Client is asking for 100% collar bolts - Is is advantageous to provide 100% or it will be problematic in future looking to the leakage possibilities..

There is no Project specific requirement for providing 100% collar bolts...So contractor/vendor can not be forced for the same.

Thanks for help in Advance....

MRV

 

[SnTMan]

mrudulv08, the usual is 25% collar bolts. I don't know of any real standard for this, some customer specs state it. In this case they are intended only to keep the shell gasket seated when the channel is removed. To hydro with channel removed, full bolting must of course be installed.

Don't see any functionl problem with 100%, more a cost issue. Since client does not specify, you are apparently not obligated, or you could furnish as an add.

Regards,

Mike