I addition to below valuable information here are some more important points to consider.
1) For process piping ( services you mentioned) normally Series A flanges been used. Series A flanges are heiver in weight with more no of bolts and in continuation of ASME B16.5.
2) For CWS you can use series B flanges since they are compact and light weight and hence more economical.
3) For the compatibility purpose you need to check existing flanges series.
Please do not mix series A flanges with Series B flanges, otherwise it will be a big mess. Hope the above information will be helpfull for you.
Hafiz Ali Alvi
Date: Fri, 29 Apr 2011 17:54:38 -0700
Subject: Re: [MW:10888] Comparison of Large Dia Flanges (B16.47 series A & B) in Refinery services
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.
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