REQUIRED TORQUE 2

[JATE]

Hello ,friend, can you help me:

We have to install a flange Ø34" with your packing, the piping class asks me:


GASKET: 3 mm thick 316SS / Graphite, Spiral-Wound Gasket, ANSI CLASS 600 RF

FLANGES: WN Flanges Class 600 RF, ASTM A694 Gr F52.

Bolting: A193 Gr B7 : ( Ø 1 7/8")

PIPE INTERNAL PRESSURE: 1000 PSI

But I don´t know where to find the torque required for this system.

Can anyone help me locate this data.

JATE--Perú-- South America

 

[XL83NL]

You can (and I suggest you do so) manually calculate this using ASME PCC-1.
Master the calcs and understand them, so YOU know which torque YOU (or your bolting crew) needs to maintain.
Dont forget to write up a prcoedure for the bolting (torque) application, so they not only know the torque required, but also how to apply it, which hardware they have to use, what is acceptable and whats not. This is also covered in PCC-1.

Good luck!

 

[DSB123]

JATE,
Just for your education there is no such thing as an ANSI Class 600 RF Flange. The standard is ASME not ANSI.

 

[ricklts]

All,
Regardless of the ASME or ANSI nomeclature, for a CL600 RF flange using a spiral wound gasket, one of the best sources of bolt load/torque is from the gasket manufacturer. Choose Flexitallic or Lamons, or whomsoever you choose, and get their version of a Gasket Handbook. The formulae are shown and explained, plus recommended torque/stress levels are given.

Rick

 

[JATE]

Thank ricklts

JATE

 

[DSB123]

rickIts,
It is important to get standards and designations correct or are you one of those that beleive "near enough is good enough"

 

[jaydeep29]

Check API 6A 20th ed. for recommendation tight torque.Annex-D formula.

My Motto: Keep calm and never give up.

 

[gasketguru]

You don't say what the temperature is, as of course this can affect the allowable loads. However, the bolts look wrong - if it is a 34"-600 series A flange it would have 28 x 2.1/4" bolts (not 1.7/8") or 24 x 2.1/4" bolts on a series B flange (the gasket sizes are also different for A or B flanges). The pipe schedule will also affect a complete calculation such as with EN1591 etc.
Assuming a modest temperature and a series A flange, then you are probably looking at something in the region of at least 50 to 60 tonnes/bolt (approx. 32-38 ksi on the root of the 2.1/4" bolts). You might estimate torque using T=0.2 x load x diameter, but remember torque only measures turning power not actual bolt load - the friction on the threads and under the nut can vary considerably.

 

[ricklts]

DSB123
You sir are absolutely correct. The proper designation is ASME, but I defer to 40+ years of calling them 'ANSI' flanges, maybe it's my poor upbringing in the oil field, to separate them from API 6B and 6BX flanged joints. Oh, and not to neglect ASME designed end-closures for things outside of the norm.

If you walk into any petro-chem/refinery/pipeline transmission facility and say 'ANSI' flange, the meaning is perfectly clear to all concerned who work with these items everyday.

Rick

 

[Krausen]

As gasketguru stated, you'll need 2 1/4" dia studs & nuts for this. 100% final torque = 4200 ft-lbs.