1971 Sect. I versus current 1

[shippo]

In the 1971 version of Sect. I, PG-31 gives the calcs for unstayed flat heads.
In Fig. PG-31 (e)(f)(g) C=0.5m with C min. = 0.3
Can anybody tell me if this is still the case with the current code?

 

[codeeng]

C varies anywhere between 0.1 and 0.75 per Fig PG-31. You'd be wise to obtain a copy.

 

[codeeng]

Sorry, for those particular one's:
(e), (f) and (g-1) circular covers C = 0.33m, Cmin = 0.2, noncircular covers C = 0.33
where
m = tr/ts
tr = required thk of shell
ts = specified min thk of shell

 

[shippo]

Codeeng, thank you for the answer.
In this instance the current value of C (0.2min) will raise the max DP to over 200psi where the old version (o.3min) only permits 150psi.
I would love to get copies of current codes for all jurisdictions Europe and US, but my main concern is with Aust. and I am spending too much on these standards as it is.
In the meantime, i will have to keep going to the library.

 

[GenB]

that I know the .2 for 31.g has not changed for years .2 in '71 as well, I am reading my '71 copy,are you sure of the .3?
genb

 

[shippo]

In my version 1971 Section I - Power Boilers PG-31 page 16, underneath the diagrams of the weld details of figs e,f & g it says "FIG.(e)(f)(g)CIRCULAR COVERS, C=0.5m, C MIN = 0.3"