Calculating Flange Thickness

What's in the pipe?

i am deigning hot oil preheater having HT area -60 m2.Tube sheet thickness is worked out to be 60 mm .sheel id is 950 mm and i want to calaculate flange thickness for channel flange and operating parameter is - 12 kg/cm2(g) and 200 degC.

ANSI B 16.47 - RF Flange 34" class 150 has thickness 3.25" (minus 0.06" for RF), PCD 40.5" and 28 holes of dia 1.62"

ANSI B16.47- RF class 300. 30" flange the corresp are thk 3.62" (-0.06"), PCD 39.25", 28 holes 1.88" (these are standard flanges) and the PCD as well as the diameters may be suiting your application.

The ID may be made to your requirement.

However you can also re-design the flanges with reference to the codes, in case these flanges are not suitable.

Design of flange is differs from design of tubesheet, and design of tubesheet is differs from design of tubesheet used as a flange.

Why don't refer directly to nearest ANSi/ASME code ? as per my data,

ANSI B16.47 30" flange has the OD 43" = 1092.2mm for class 300 (at 200 deg C- upto 635PSIg or

class 150, 34" is OD 43.75" (pressure 200 PSIg)

Check the data and look whether it is suitable for you.

and if that doesn't work, please see Appendix 2 of ASME BPVC Sec VIII-1

The flanges can be classified into Standard Flanges and Non-Standard Flanges.

• For Standard Flanges: we can define all flange dimensions including its thickness (without proceeding any design calculations) by only just knowing the flange material and design conditions (pressure & temperature), which denotes to flange rating/class. This can easily be found from ASME B16.5 (for those flanges from NPS 1/2" up to NPS 24") and ASME B16.47 (for those flanges from NPS 26" up to NPS 80").

• For Non-Standard Flanges: we have to proceed a design calculations as per ASME code Section VIII, Division 1-"Mandatory Appendix 2 Rules for Bolted Flange Connections with Ring Type Gaskets" about 10 pages of detailed calculations per flange (integral, loose and optional type) and blind flange shall be carried out in accordance with ASME UG-34.6 (6 pages per blind flange).

• Please refer to the following CR4 threads for design of blind flange under internal (or external) pressure as per ASME Code, Section VIII, Division 1: can you tell me thickness calcu........ & External Pressure Blind Flange.

To calculate the max. design pressure of any flange with a such rating, 1^st you have to select the flange material and 2^nd you have to select the design temperature.

Please refer to the following site, it is very nice : ASME B16.5 Flanges, which by knowing Design Temperature, Flange Material and Flange Rating, you can find the Max. Design pressure.

For additional information, please see the following CR4 Thread : Pound Rating.

thank you very much for gudience

Regards,

Ritesh

Dear Sir,

I do not have ASME std. please provide if u have in soft copy.

Dear r_jain31,

I can help you, please send me your e-mail.

• For design of Non-Standard Flanges (integral & blind), see CR4 Thread Flange Hydro Pressure Analysis and you can download the following samples of design calculations: Flange_Design_Calculations.PDF & Blind_Flange_Design_Calculations.PDF.

Dear Galala,

Can you send me the soft copy

Dear Mr. Abdel Halim Galala,

I also want a soft copy of ASME CODE. For your reference the following is the text in the thread where you have answered as "I can help you, please send me your e-mail." to Mr. rjain 31.

My mail is sdr510@rediffmail.com and blackie510@rediffmail.com

I requet you to send the same to the above mail Id.

Thanks,

DHAYANANDHAN.S,

CR4 MEMBER,

INDIA.

Dear Brother,

Could you also send me the same spec please. My email id is abbasaliahmed@gmail.com.

Regards,

very good!

I want to calculate flange thickness for 698 OD & ID 508 MM having operating pressure 2kg/cm2(g) and 220 deg C operating temp respectively.please guide, how to do calculation for the same.

Regards

for ATHULYA BELLOWS & ENGG. PVT. LTD Alpesh Shah