wrinkles allowed in reducer? 2

[CREERAAM]

Hai,

The attached photo is one of the fitting which is hot formed ecc reducer, In the reducer pipe size forming marks (up and down) noticed in the inner surface is it allowed by any standard?

The size is DN 500 mm x DN 300 mm - SA 234 Gr WPB

Thickness - 9.53 mm

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[XL83NL]

Is this a B16.9 reducer? I would reject it, perhaps, but if the manufacturer has proven to manufacture B16.9 compliant fittings (i.e. a certificate as per 9.6(i)), then there's no specific section in B16.9 that doesnt allow this, imo. Maybe thers can concur?

 

[SJones]

The point is: is it disallowed by anything in the purchasing documentation, and if it is, what are the acceptance criteria? From the question, it would seem that the purchasing documentation is silent on the issue. The only stipulated acceptance criteria for this phenomenon that I have noted are contained in ISO 15590-1 for induction bends. Whether you can impose the requirements after the fact is another matter.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[XL83NL]

SJones is spot on. Couldn’t have said it better. Take his advice - it’s the best you’ll get

 

[GD2]

Creeraam,

While you won't get a lot of info/allowable limit from most fitting standards, you should consider the following and take a good lead from there:
1. Piping construction code
2. Fitting standard
3. Manufacturer's QA/QC program (this plays a big role in product quality, specially if hot formed in terms of difference in material strength, hardness). Don't trust the MTR. Many times you won't get what you see in the MTR, if it is not from a reputed manufacturer.
4. Application - specially if you are using in a severe cyclic condition.

If you want to use it in severe cyclic system, it is a NO NO from me.


GDD
Canada