Pneumatic Torque Wrench with Range 0 to 50Nm

In which country is this thing needed?

It is needed in Oman,for Oil and Gas sector.

Please list the suppliers contacted so far without success, so that these can be eliminated from further enquiries.

You can use a 100 Nm at 50 by pressure reduction in the supply line. You should in this case calibrate the tool and verify it at regular time intervals.

Try these guys. http://www.radtorque.com/products_pneumatic.php

Hi anwarali,

What actual torque (torque range) do you require?.

Do you have a large quantity of items to torque down?.

Dear Grochy,

thanks for your suggestion,i think i am close to my goal.

Regards,

Anwar Ali

Hi

It is important that you specify what accuracy you require from your wrench. I have some experience in this field and if you want accurate torque you will not achieve it with a pneumatic device. Talk to Norbar in the UK if you require and degree of accuracy.

Regards

Oliver Dunthorne

Dear Oliver,

Thank for your suggestion,

Can your please suggest what best possible way to maintain accuracy in pneumatic torque wrench,is it can be used for production line.

basically we are the transformer manufacturers and we always face issue pertaining to oil leakages,which occurs due to improper tightening.

is it any best method do u have to arrest these leakages,please suggest

Softer, more resilient joint materials?

Hi

My background on this is from a Danish hydraulic motor manufacturer. They tried every conceivable type of torque wrench from pneumatic to electric and they all have serious problems with consistency. The only reliable way is to put a torque transducer between the wrench and the work piece. This is expensive. The cheapest and simplist way around this is a manual torque wrench, the type made by Norbar who are in Banbury in the Uk , you will find them on the web.

Regards

Oliver Dunthorne

I suspect that the root-cause of poor torque accuracy in your case is a result of initial misalignment of the mating surfaces during the torquing procedure and/or failure to follow the correct bolt tightening pattern.

There are torque tubes available from several vendors to limit the applied torque but they will not solve leaks caused by under-torque or misalignment of the mating surfaces.

How is your joint designed ? Erronated design and manufacturing problems (as mentioned by an other comment) cannot be compensated by most precise torquing.

If you give more details about the joint then we can give you hints what to do.

For a flat joint several parameters are to be respected as:

seal width

seal nature = material, compliance, creep,

distance between bolts

stiffness of flange with respect to seal compliance

to name only a few several other are also playing a role.

As for precision DO NOT USE impact pneumatic tools only continuous nut runners with a torque limiter adjusted on a rig for the level you want to reach. Dispersion in good designed joint is in the range of 5%.

According to my computations you should use M8 to M10 bolts. As I already mentioned you should NOT use impact tools since their unceratinty is high. To solve your leak problem you need as well a high repetability of torque as a correct design of the joint.

If you are OBLIGED to use pneumatic tools then try to find at the different suppliers tools with a torque limitor (clutch usually) which can be adjested and buy a calibrating device with which you make regular tests and check the torque value and readjust if required the torque. It could be good practice to check on the joint via a torque angle transducer between tool and bolt/nut if the tool brings the torque you set on the calibrator.

If you can afford an electric tool then a computer controled nut runner would be the best device (used in the automotive industry) since it can make a record of all operations with time and date. Such devices are equiped with an internal transducer and so you exactly at which torque the assembly was build up.

However I insist on the fact that if the joint is not OK even the most complex and precise tool will not compensate for the poor quality of the joint itself.

further to my original post if you need to verify that the transformers have been torqued to the tools settings you can attach a Kappa controller to the tool that will give a pass/fail indicator as well as the ability to print the results. I mentioned the stanley range as the catalogue was handy Cleco is another company with a range of pneumatic assembly tools and torque verifiers.

Anwarali-

Do you want a torque wrench or a pneumatic impact wrench ?

If torque wrench (ft-lbs or other units), they are readily available at numerous auto parts suppliers and mill suppliers.

If you want a pneumatic impact wrench, (ft-lbs or other unit) they are also readily available at auto parts suppliers and mill suppliers.

If you are looking for a Nm reading, consult a supplier in a country that uses that units, or just convert it, 1 ft-lb = 1.3558 Nm, 1 Nm = 0.7375 ft-lb.

A socket for these will probably be a 1/4" or 3/8" sq drive.

Good Luck, Old Salt