Dear Mr Krishnakumar, To standardize the pipe flanges for sizes NPS 26 to NPS 60 for class 75 through to Class 1500 ASME B 16.47 was developed . At that time it was decided to include the flange dimensions as per MSS SP 44 flanges except Class 75 which are ASME/API 605 flanges. Since the dimension of these two classes of flanges were not compatible with each other it was decided that MSS SP 44 flanges are B 16.47 Series A flanges and API 605 flanges are designated as B 16.47 Series B flanges. Standards followed: - ASME B 16.5 : UP TO SIZE NPS 24
- ASME B16.47 SR.A / SR.B : UP TO SIZE NPS 60 (for rating150& 300)
- AWWA C-207 : UP TO SIZE NPS 144 (without Hub) & UP TO SIZE NPS 96 (With Hub) - Pls. refer this standard while giving reference of this for any size.
Other member may offer their comment, Vinod
--- On Fri, 4/29/11, Krishnakumar M S <krishnakumarms01@yahoo.com> wrote:
From: Krishnakumar M S <krishnakumarms01@yahoo.com>
Subject: [MW:10880] Comparison of Large Dia Flanges (B16.47 series A & B) in Refinery services
To: materials-welding@googlegroups.com
Date: Friday, April 29, 2011, 10:46 AM
Hi,
I have to use 30", 42", 48" pipes in Cude Oil, Naphtha, HSD and CRWS services.
What is the criteria between the series A & B for ASME B16.47. Regarding no. of bolts, enonomy, availability etc.
If anyone to know this please.
Regards
Krishnakumar
Fact Engineering & Design Organisation (FEDO)
Cochin, India
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