Try an impulse wrench.
http://pdf.directindustry.com/pdf/yokota-europa/yokota-impulse-wrenches/16895-6222-_12.html

Ted

Thanks Ted,

I can't find much literature on impulse wrenches.  Is there a reasonable justification for why an impulse wrench would provide a smoother tightening than impact guns?

Kyle

Instead of a metal-to-metal clutch or impact mechancism they use a hydraulic impulse mechanism to deliver torque to the fastener.  Unlike the hammering of the impact mechanism the pulse mechanism uses hydraulic pressure build and release to impart the impulse to drive the fastener.

Here is a link to Aimco who has been in the business for a while:
http://www.aimco-global.com/srchresults.asp?catky=554912&subcatky=77618&subcatky2=247189&subcatky3=196331
 

Ted

Are you trying to reinvent a job for the sake of a bolt that has 200 ft-lbs of torque?What type of bolt are you using?How about the trusty old torque wrench?  

Use a pneumatic nut runner.  Plarad, Atlas Copco, Ingersoll Rand and many others.

Ted

I have been told that Impulse wrench, over time, is not as accurate with torque application because of the fact that it makes use of a clutch.

Is a pneumatic nut runner in this same category?  I need something that I can trust relative to torque application over time but does not damage the threads as much as a impact gun.    

Will a standard torque wrench fit my needs in this concern?

THANKS!

No impact wrench should be used if torque accuracy is required.  All impact wrenches use a clutch mechanism of sorts.

Nut runners are generally motor-driven gear sets with the final drive to the output.  Higher output nut runners will require a reaction arm instead of depending on the operator to resist the torque.  Run up to tight is slower than an impact wrench.  Accuracy is more dependable than an impact wrench.

Ted