 # Question #24 How To: Determine The Minimum Required Thickness Of Circular Flat Heads And Covers

### 5 thoughts on “Question #24 How To: Determine The Minimum Required Thickness Of Circular Flat Heads And Covers”

1. Robbie, for the C value in this question how come you multiply 0.33 by (tr/ts), and where do I find this info in ASME?
Also, will the questions always let me know which Figure they are referring to in Figure PG-31 or is that something I need to learn how to do?
Thanks!!

1. In the 2007 ASME Boiler & Pressure Vessel code on bottom of PG #18 you’ll see NOTES: (1) For illustrations (e), (f), and (g-1) circular covers, C = 0.33m, C min. = 0.20; noncircular covers, C = 0.33.

Because of Figure PG-31 referring to (g-1) we multiply 0.33 by m which is (tr/ts). The description of “m”, “tr”, and “ts” are explained on the left hand side of page 15. From my experience the figure they are referring to in Figure PG-31 will always be provided in the question. Let me know if I explained this well enough, as this is one of the more difficult aspects of completing these questions.

1. Ya that really explains it well, thanks! I just totally overlooked the m.

2. Please calculate the thickness by using formula (2) of PG-31.3.2 of Page 15

3. Hello,
I have a cylinder with internal threads on both ends, there are 2 caps with external threads which threads into the of cylinder.
How do I calculate d?
How do I calculate C?
I do not have access to ASME book to look at those mentioned pages, is it possible to have image of those pages with figures to see what it means.
Also I read somewhere that minimum safety factor for threaded joints must be 4, is there anything in code to mention it?
Thank you
Kamal