80" Elbow But we didn't find any code to judge this fitting shape and

[LSThill]

Team Members "help asap"

We would like to request your advisor as below situlation;

We received the large fitting as 80" Elbow. But we didn't find any code to judge this fitting shape and dimesion like acceptance criteria during the receiving inspection.
So, Could you give us any information about this?
We checked the ANSI B16.9, & MSS-79. But there are only described to 48" size.

Would this fall under AWWA?

Leonard Thill, Pusan Korea

 

[TangoCleveland]

Your receiving inspection should be in accordance with the standard to which the fitting was ordered. Did you specify a standard when you ordered the fitting? If not, you might be stuck with the as-delivered fitting.

Assuming you have a carbon steel elbow, AWWA C208 might address steel fittings; I'll check. I know that AWWA C207 covers steel flanges up to 144".


Larry

 

[ApC2Kp]

Probably best to check the elbow for 'fit to function' and not try to establish any standards after the fact. Three major items that I would recommend to be inspected:
1) material of elbow same as or compatible with the balance of plant piping - for reasons of welding to pipe, and for fluid service / corrosion service. If the elbow material does not match the pipe or valve body materials of construction, then there may be questions of pressure + temperature capability and corrosion. Material test reports of material should be provided by manufacturer. Any fabrication welds should have examination reports, even if it is only visual exam of welds. A spot x-ray would be good for material thickness greater than two weld passes.
2) Dimensional requirements need to be checked from the piping or duct design drawings. Face to face dimensions, wall thickness, weld end preparation, and diameter tolerances may reveal welding fitup problems before getting to field.
3) The elbow is likely fabricated with several miter cuts. Whether it be a 3, 5, or 7 cut miter the elbow needs to have strength for pressure and for bending. If the piping has been designed for a particular temperature, then the stress analysis should be compared for elbow radius and number of miter cuts. The stress analysis might have to be updated for the radius+number of miter cuts on the elbow.