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[MW:2861] Re: TORQUE VALUE

By Materials & Welding
Hi Ari
If you don't mind, which code/spec we should refer to get the value. Thank

On Sun, Aug 2, 2009 at 9:25 PM, ARI <ariv2k@gmail.com> wrote:
Dear Javed, Enclosed the details,
 
Regards,
 
Nom. Fig.

Size

Ins. (mm)

Bolting

No. x Dia.

Ins.

Rec.

Bolt Stress

lb/in2

Torque lbf.ft. (Nm)

Bolt Lubricant

Molykote 1000 (µ = 0.11)

36                     (900)

20         x          3 ½"      UN8

45,000

15983

(21670)



On 8/2/09, 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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Comments

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
August 3, 2009 at 5:13 PM
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