corrosion allowance.
try 1.25 mm for CS. try installing a corrosion coupon to monitor
metal loss.
retirement thickness.
his is determined by either the hoop stress, temperature or
structural limitation. try the following.
let tr=retirement thickness
let tmin = min. thcikness per B31 equation
let t= corrosiaon allowance
then tr = tmin - c
use also the barlow equation tr= PD/Sallow/E
- In PipingDesign@y..., "SARE, RALPH H." <SARERH@Y...> wrote:
>
>
> > ----------
> >
> >
> > There is no specified corrosion allowance except for air
receivers.
> Right. What i was hoping for is reaction from expereinced piping
engineers
> as to the values they normally use to figure out the wall thickness.
>
> > The pipe undertolerance is 12.5%
> Right. but for cs pipe only such as seamless API 5L-B. I dont
think the
> value of 12.5% holds true for welded 304L Ss pipe such as A358
class 1 efw
> sch 10S.
>
> > You might want to think about getting yourself a Code book. Most
of this
> > stuff is in there.
> para. 304.1.1 addresses mech'l allowance + CA + erosion allowance
and refers
> to a value of 0.5 mm in addition to threaded cut. Not much help
there. Other
> source would be NACE for the CA. By the way, ss of course would
have zero
> value for the CA.
>
>
> > Christopher Wright P.E. |"They couldn't hit an elephant from
> > chrisw@s... | this distance" (last words of Gen.
> > ___________________________| John Sedgwick, Spotsylvania 1864)
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> >
> >
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Received on Sun Jul 29 04:07:00 2001