Re: Fw: PIPING SYSTEM PRESSURE CLASSIFICATION

A 300 lb. cl., ASTM A-105 forged c/s (group 1.1) flange can handle up to a max. of 650 psig at 325 degrees F. THis is from the B16.5 standard table 2.

• Original Message ----- From: Paul Bowers <pbowers@pipingdesign.com> To: <PipingDesign@yahoogroups.com> Sent: Thursday, June 07, 2001 6:41 PM Subject: [PipingDesign] Fw: PIPING SYSTEM PRESSURE CLASSIFICATION

> Anyone want to take a crack at this one? Instinctively, I'd guess
> that a 300# rated system would be OK but some of you with more
> steam experience than I might want to comment.
>
> Paul
>
>
> ----- Original Message -----
> From: Tom J
> Subject: PIPING SYSTEM PRESSURE CLASSIFICATION
>
>
> > Paul,
> >
> > I was referred to you by Bruce Jeffers (one of the people on the
> "Steam
> > List"). I am working on a 325 deg. F. MTW system design where I
> need to
> > maintain a minimum system static pressure set point of 275 psig
> to prevent
> > flashing to steam at the high point in the system. I have a MTW
> > circulating pump in the closed system. For the required flow
> rate, the
> > circulating pump must produce an additional 370 feet of head
> (about 160 psi
> > disregarding the decrease in density of the heated fluid).
> Adding the 160
> > psig to the static head requirement of 275 psi I get a total of
> 435 psi at
> > the discharge of the pump. This pressure will gradually
> decrease as you
> > travel further down the piping system (away from the pump
> discharge).
> >
> > What is the minimum system pressure-temperature classification
> for the
> > piping, fittings, and flanges for this system?
> >
> > I find a copy of standard B16.5 that appears to indicate that a
> 300 lb.
> > Primary Service Pressure Rated system could be used up to 680
> psi (non-s
> > hock).
> >
> > Please comment.
> >
> > Thank you,
> >
> > Tom
>
>
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Received on Fri Jun 08 09:22:00 2001