I was looking at calculating this value for mixtures of gases (treated as ideal gases).
Some resources I've found online suggest taking the mole fraction of each constituent gas and multiplying that by the specific heat capacity, and then taking the sum.
i.e.
Cpmix=Σ(ni)(Cpi)
However, since...
In this table, the first two materials listed are Soft Iron, with a maximum hardness of 90 Brinell or 56 Rockwell "B", and low-carbon steel, with a maximum hardness of 120 Brinell and 58 Rockwell "B".
However, Note 1 is referenced for the soft iron, and states 'May be low-carbon steel, not to...
I have two questions related to interpretation of certain B31.8 sections.
We build compressor packages, usually to B31.3, and so we use a lot of ASME B16.9 fittings and B16.5 flanges.
We've been building to B31.8 for some packages these days, and there's a minor ambiguity I want to confirm...
We are building ASME B31.3 piping for a compressor package where our customer has specified an MDMT of -50F for certain outdoor applications. We are using the typical materials A333 Gr 6, A420 Gr WPL6, and A350 Gr LF2 Class 1 for this system. Our QC department has raised a concern as the MTRs...
I'm implementing pressure drop calculations in a number of internal sizing tools using the Darby 3-K method. However, a problem I'm running into is finding appropriate coefficients for the actual fittings that we use.
Does anyone know if there are any published coefficients other than what I...
I've been attempting to fully understand the valve sizing procedures that Fisher provides for their valves. Where I'm running into some issues is determining the Fp coefficient for scenarios other than where either the valve matches the linesize, or the valve is installed between identical...
Hi all,
We're running into an ambiguity where we can't really determine the proper definitions and rules.
We package gas compressors in Alberta, which includes fabrication of all piping (typically B31.3), pressure vessels, etc. As the majority of our packages are destined for northern...
I work for a Canadian compressor packager, and we've recently made some inroads into the US. One result is that we now need to build some of our packages to B31.8, where previously we've only ever built to B31.3.
I'm developing a piping specification for our use for B31.8 applications - one...
Note that everything below is based on piping systems built to B31.3 with B16.5 flanges.
Our QC and hydro-test group had occasionally in the past accidentally taken hydro-tests to pressures higher than specified. Although there weren't any visual indication of failure (i.e. leakage or...
Typical reciprocating compressor skid design necessitates keep all piping in the package as low as possible, to decrease the magnitude of vibrational moments, and prevent the skid from shaking itself apart. My company's standard package designs follow these best practices, and they've worked...
We've been having some issues recently with AIs not accepting our inspection openings. We're currently trying to figure out what the requirements are from code as referenced in this section:
(7) Flanged and/or threaded connections from which
piping, instruments, or similar attachments can be...
Hi guys,
Currently we're using DesignCalc software to do our pressure vessel calculations, although we're thinking about switching to PV Elite. There's a specific problem we're having right now: we need to do code calcs for this Ariel racetrack flange...
