flange face serration damage

[Badam krishna]

Dear Experts,

1.Share your Knowledge on Serration damage on flange face

2. B 16.5 allows serration damage allowance/acceptance criteria (Table 3) . explain how to interpretate?

3.Welding can be permitted for flange face/Serration damage? 

with regards,

B.KRISHNA

[Dinesh Somwanshi]

 dear Krishna,

 

as per my kwoledge & information,generally we are following for serration damage is as,

 

1.serration inspection is based on comparative method for the serration (using comparator)

 

2.if possible the width of the flange as per 16.5 permit some tolerance if its extra you make machining for raised face (mim 1.6 -2 mm)with respect to flange face.

 

if its width of flange is outside tolerance limit ,to avoid delay better for replace new one.but this also based on clint contractor mutual understanding & terms..

 

regards

 

Dinesh somwanshi

 

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[M Vedaraju]

Dear Friend,

 

Please refer ASME PCC-2, Repair of Pressure Equipment and Piping – Part 3-Article  3.5 for detailed flange repairs (with or without welding).

 

With kind regards,

M. Vedaraju

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[Nachhattar Singh]

Dear All

 

The depth of the damage that can be accepted is the depth of the serration and the area that can be accepted is 1.25 Cm2.

No machining or grinding is permitted,

The damaged serration cannot be reconditioned/repaired, the only way is to have the machining done so as to have the new serrations made on the surface.

 

Trust you will find this information useful.

 

Nachhattar Singh

 

 

PLEASE THINK BEFORE PRINTING

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[Dinesh Somwanshi]

actually I need to mention an flange thickness instead of flange width(machining partially are not allowed on rf)

[sathishkumar R]

Hi Krishna.! Good day.!

   Refer B16.5 para 6.4.5 & 6.4.6... ( for flange dia less than 24 NPS )

1) Surface finish requirements

2) serration depth 

3) Number of serrations per inch

4) Damage in serration ( depth of serration damage > half depth of serration , shall be considered & min distance between adjacent imperfections to be considered )

Note : Never ever ask any instrument or Gauge to measure Flange face finish

That's all about flange face finish.. Hope it is useful