[MW:2872] Re: TORQUE VALUE

http://materials-welding.blogspot.com/2009/08/mw2861-re-torque-value.html

there was comment posted on this discussion, pl. check the above link

Jörg said...

Hello Mohammed,

Your query is a "mechanical oxymoron"! If you are being told that bolt tensioners must be used, your torque value question is moot: there is no torque involved when bolt tensioners are used! You might wish to see the link for further details. If you know what the required bolt stress is, you simply multiply that by the area of the bolt tensioner and then by the LoadTransferFactor (determined by the bolt dia and grip length). This will provide you with the bolt tensioner operating pressure - if you'll be tensioning 100% of the flange's bolt population simultaneoulsy. If you'll only be performing 50% tensioning, you'll have to calculate both A and B pressures.

Here's the link: http://www.heviitech.com/Hevii_Tensioner_Intro.html

Best regards,

Jörg

On Mon, Aug 3, 2009 at 12:14 PM, Ramprasad Chari <ramprasad.chari@gmail.com> wrote:

Bolt dia is 3.502 inch.Area shall be 8.974 Sq.Inches.

Bolt's tensile load in Lbs shall be 424022 Lbs for 50% of SMYS for L7 bolts and same shall be 706703 Lbs if we take 75% of SMYS for L7 bolts.Accordingly the torque can be between 27225 lb.ft(36910 N-m) to 45370 Lb.Ft(61515 N-m) based on formula,Torque=KDP/12 where K=0.22 for Zn plating,D is dia of bolt in inches and P=Bolt load in lbs.

Regards

Aarpee

On Sun, Aug 2, 2009 at 6:33 PM, Mohammad Javeed <mmubasharjaveed@gmail.com> wrote:

Dear all

Have a nice day

I need your help about one query regarding torque value. We have a one flange joint of dia  36" RF CL. 900 material A350-LF2.and bolt length is 800mm. As per our client requirement this tightening should be done with hydraulic tensioning system. So what should be the torque value for this flange?

 

Thanks

M javed   

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