3000# SW Fitting Max Hydrotest Pressure

414 bar is 6,085.8 PSI.

Do not pass go. Do not collect $200.00.

Lyn, read what was written. Im well aware of what 414 bar equates to. ASME B16.11 states that the 3000# rated fitting should be able to withstand the equivalent hydro test pressure of the pipe in the system. I.e. Sch 80S pipe. Im guessing you are saying 3000# is the maximum rating of the fitting. That is not what is stated in ASME B16.11 Section 2.2. Hence my post. Regards, Derek

Lynn, extract from B16.11

2.2 Pressure Test Capability

Pressure testing is not required by this Standard, but

the fittings shall be capable of withstanding a hydrostatic

test pressure required by the applicable piping

code for seamless pipe of material equivalent to the

fitting forging and of the schedule or wall thickness

correlated with the fitting Class and end connection of

Table 2.

Table 2 Correlation of Fittings Class With

Schedule Number or Wall Designation of Pipe for

Calculation of Ratings

Pipe Used for Rating Basis

Class [Note (1)]

Designation Schedule Wall

of Fitting Type of Fitting No. Designation

2000 Threaded 80 XS

3000 Threaded 160 . . .

6000 Threaded . . . XXS

3000 Socket-welding 80 XS

6000 Socket-welding 160 . . .

9000 Socket-welding . . . XXS

I thought it was funny. I'm using a different type of pipe specification. See below:

1. All pipe is to be made of a long hole, surrounded by metal or plastic centered around the hole.

2. All pipe is to be hollow throughout the entire length.

3. All pipe is to be of the very best quality, preferably tubular or pipular.

4. All acid-proof pipe is to made of acid-proof metal.

5. The O.D. (outside diameter) of the pipe MUST EXCEED the I.D. (inside diameter) otherwise the hole will be on the outside of the pipe.

6. All pipe is to be supplied with nothing inside the hole so water, steam, or other stuff can be put inside the pipe at a later date.

7. All pipe is to be supplied without rust, as this can be more readily put on at the job site.

8. All pipe is to be free of any covering such as mud, tar, barnacles or any form of manure before putting up, otherwise it will make lumps under the paint.

9. All pipe over 500 feet in length must have the words "Long Pipe" clearly painted on each end so the fitter will know it is a long pipe.

10. Pipe over two miles long must also have "Long Pipe" painted in the middle so the fitter will not have to walk the entire length of the pipe to determine if it is a long pipe or not.

11. All pipes over six inches in diameter is to have the words "Large Pipe" painted on so the fitter will not use it for a small pipe.

12. All pipe closures are to be open on one end.

13. All pipe fittings are to be made of the same stuff as the pipe.

14. Pipe specified as "Straight Pipe" shall not have fittings within its length, otherwise it becomes "Crooked Pipe."

Im guessing piping is not your forte. Thanks anyway.

I'm guessing it is not yours, either.

Cheers.

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Really not clear:

1.- The allowable working pressure for this pipe is approx 414 Bar. ? Where? for the pipe fabricator? Hydro in factory is araund 30 sec.

2.- Do you have the desing pressure of the system to be Hydro test? What about 1.5 desing pressure?

3.- For what you need to use ASME B16.11.?

That's an interesting dilemma. Bonney Forge states the same as B16.11. Flow-Tech states the same thing, but the graph on this page http://www.flow-techs.com/Sec%204/5.PDF shows 3000# fittings (CS and 321) to be rated for 3000psi at 100degF and below, giving an allowable hydrotest pressure of 4500psi. I don't have the allowable stress for 321, but if I were you, I'd double check my calculations and then call 1 or 2 fitting manufacturers. I also don't have B16.11, but there are 2 more things to consider: a) there may be the assumption of some corrosion allowance deduction in the pipe thickness, and b) the pipe wall thickness manufacturing tolerance. Keep us informed.

PS: Doing a little rough factoring of the info I have close at hand, I don't think 1/2" S/80 is adequate for 390 bar, even at ambient temperature.

Theoretical working pressure for Sch 80s stainless steel seamless pipe is 6500 psi. Bursting pressure is 26,250 psi. I have gone back to head office for confirmation. I work for a major oil company and I am using the the company piping specs. I would be surprised if they are wrong, but I suppose there is also a chance that they may be. Thanks for the advice everyone.

dereb,

Your understanding of the pressure rating of Class 3000 forged fittings is correct. This is, of course, despite the static and nonsense from those who do not understand piping system design.

Moronic comments seem to be tolerated and even encouraged on this forum....

Developing pressure-temperature ratings for individual components of piping systems is usually done when piping line classes are developed for a project. This is done so that questions like yours do not come up repeatedly

Unfortunately, one of the first things new management does when involved in any kind of retrofit work is to discard all of the drawings, specifications and records of any previous engineering firm.

Good luck....... tell us more about your system

I did calc on 1/2" S/80, deducting 12.5% for mill tolerance and 0 corrosion allowance with allowable stress of 20,000 psi (I'm not sure of this, but should be +/- 20%), and concur with your 6500 psi. I also looked at some past threads on CR4, but didn't find anything definitive. I'd be interested in what you find out.

Gentlemen, HQ confirmed that 1/2" 3000# SW fittings are good for hydro test of 390 Bar. Thanks for your good advice.

Regards,

Derek