Clarification for Table PW11, Sec I, BPVC

[samuelliu]

I am working with an Indonesian local contractor and there is an unintelligent disputation here and now regarding Table PW11. They insist that the temperature mentioned in the top of the table, 455 Deg C, is the fluid service temperature even I had indicated there is no such water temperature available for water over the world as the critical temperature for water is 374 deg C only. As I know, this temperature is for Furnace Gases. Does anyone know some official clarification or publication that would prove that they have been misunderstanding for the code? I don't believe that the normal ASME Code INTERPRETATIONS would address this.

 

[metengr]

There is no need for interpretation on this matter. If you review ASME Boiler and Pressure Vessel Code, Section I, Table PW-11, the main heading refers to "Pressure Part Service Conditions" and the columns state "In contact with Furnace Gases", and " Not in contact with furnace gases".

The "in contact" with furnace gases refers to exposure of tube or piping to actual flue gas temperatures containing steam or water, and "not in contact" refers to tube or piping located outside of the gas touched region of the boiler containing steam or water.

 

[samuelliu]

Dear Metengr, I agreed with your opinion 100%, as I said in my question. However, what I need is a supporting document. Do you have it? I guess, some out-of-date code might have different Table PW-11 which was the temperatures in the same line of ...Furnace Gases. Anyway, Thanks for your reply.

 

[metengr]

Samuelliu;
The words are absolutely there in Table PW-11 - I don't know how much clearer you need to be? Regarding your second statement - the ASME Code is copyright protected so I can't see how anyone could copy the Table and insert words in the Table that would reference back to the ASME B&PV code.

 

[samuelliu]

Metengr, many thanks from Indonesia!

As I said in my original post, this is an unintelligent disputation, and it is occurred in a non-English country. From 2004 Edition, I don't know what appeared in other editions, the declaration of "...In Contact With Furnace Gases > 850°F (455°C)" is broken into two lines, therefore, some Indonesian guys here and now believe that "> 850°F (455°C)" means the fluid temperature. If you have some old version code such as 1992 or so, the statement of "...In Contact With Furnace Gases > 850°F (455°C)" might be at the same line. Thanks for your reply.

 

[samuelliu]

Hi, is there any further comments?

 

[GenB]

The pw 11 has nott been changed much since i know of I have a copy from the 50ths and it is basically the same.
in any way if you fabricate to the ASME Code you are obligated to use the latest Code and Addenda,
so the 2004 is the Code you abide to.
All the secundary books will tell you the same, you need to get some trining books so you can see pictures of how the furnace gases touch the tube bunddles, water walls and generator banks.

ER