FYI

 

Mike,

 

The 12 pt will go a long way to give us more area to work with. Can you please send the new files of the nut and larger spherical washers.

quick calculations reveal that if we utilize the washer face beyond the nut diameter we would generate a washer surface contact stress of about 45,600psi

 

I have included three jpgs of the Hydraulic nut on the test assembly and also the .tiff and .prt file of the Hydraulic nut.

 

The plus on the hydraulic nut is that you would not need the hex or 12pt nut on this side of the stud as the Hydraulic nut will remain on the application and retain the load after the pressure is released. We would also be able to machine the Male portion of the spherical washer into the nut base and supply the mating washer with the nut as an assembly. Machining the one washer into the nut body would eliminate yet another load-loss path and component.

 

Looking at the Tiff schematic, you will see the center puller which is threaded. The whole unit is threaded onto the stud. the hydraulic pressure is applied, it can be applied to a single nut or to take full advantage of its' design, several nuts would be pressurized at the same time using a series hose hookup bringing the flange together evenly.

 

Once the load is achieved, the outside top collar is screwed down by hand to contact the nut body. This is the mechanical means to retain the load. At this point, the pressure is released, hoses removed along with the fittings and usually, the ports would be plugged to keep debris out.

 

At a later date, inspection can be done and a single or multiple nuts can be pressurized to reestablish the load if perhaps the gasket has crept.

 

Please take a look at the jpgs and tiff and .prt files and give me a call if you have any questions.

 

Regards,

Robert W. Karol
Application/Design Engineer
Hydratight-PowerGen
 
Mobile 908-531-2081
robert.karol@hydratight.com
www.hydratight.com

 

 

From: Cole, Michael [mailto:colemj@ornl.gov]
Sent: Wednesday, February 28, 2007 9:13 AM
To: Robert Karol
Cc: Williamson, David E.; Nelson, Brad E.; Lawrence E. Dudek
Subject: RE: Stellarator jpgs w_HL02 tensioner

Mr. Karol,

 

I have attached a pdf showing a 12 pt nut instead of a hex nut.

 

If you can modify your tension device to fit on the spherical washer and tighten the 12pt nut I think this might work.

 

I would like to discuss this with you as soon as you have the opportunity to review the attached information.

 

Mike

 

Ps Please send any information you have on the hydrostatic nut. We are very interested and need the information to make a few layouts. We need to make a decision on what to do in this area so that we can order some hardware.

 

mike

 

 

 

 

Gentlemen,

Thanks for the time to discuss the tensioner application.
Please find attached the .jpg files derived from the pro-e assembly
They are shown with an hydraulic tensioner model HL02
This model is capable of max load 99,429 lbs
We would want to apply about 15% additional pre-load than what the application calls for to make-up for load loss.
This percentage is dependant on application conditions and is fine tuned during the testing process to narrow in on your residual load target of 65,000 lbsf.

<<...>> <<...>> <<...>> <<...>> <<...>>
I will be in touch with details of the hydraulic nut and pro-e files of this application with the tooling assembled.

Regards,