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azia5333
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Calculating Steam Velocity through Pipe

12/08/2020 9:46 AM

Hi respected members. Can anyone please guide me on how to calculate saturated steam velocity inside a pipe? I know the steam flowrate in lb/hr. I also know the pipe geometry. Appreciate the help.
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PWSlack
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#1

Re: Calculating Steam Velocity through Pipe

12/08/2020 10:02 AM

Use a set of Steam Tables to look up the density of the steam at temperature and pressure measured. From the density and the mass flowrate comes the volumetric flowrate. Divide the volumetric flowrate by the cross-sectional area of the pipe and "Robert is your mother's brother".

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#20
In reply to #1

Re: Calculating Steam Velocity through Pipe

12/10/2020 8:30 AM

Mayhew & Rogers: "Thermodynamic Properties of Fluids", any edition.

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SolarEagle
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#2

Re: Calculating Steam Velocity through Pipe

12/08/2020 10:09 AM

https://www.tlv.com/global/US/calculator/steam-velocity-through-piping.html

d: Pipe Inner Diameter (in)
ms: Steam Flow Rate (lb/h)
v: Steam Velocity (ft/s)
V: Specific volume (ft³/lb)
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PWSlack
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#3
In reply to #2

Re: Calculating Steam Velocity through Pipe

12/08/2020 10:23 AM

<...Specific volume...> is the reciprocal of density, and can be found from Steam Tables.

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#10
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Re: Calculating Steam Velocity through Pipe

12/08/2020 12:07 PM

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phoenix911
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#11
In reply to #10

Re: Calculating Steam Velocity through Pipe

12/08/2020 12:11 PM

If you work a lot with steam,... I love the Water and Steam Pressure (WASP) program,... it easily gives so much information on the condition of the steam in different environments.

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Codemaster
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#13
In reply to #11

Re: Calculating Steam Velocity through Pipe

12/09/2020 7:19 AM

The Spirax Sarco one is good too, and it's free!

Spirax Sarco

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phoenix911
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#14
In reply to #13

Re: Calculating Steam Velocity through Pipe

12/09/2020 9:55 AM

I agree, I have Spirax design book, (the red one). I’ve been using that since the 90’s.

i guess they’re blue now...

And this from Spirax this would help the op...

Because I don’t work in the design of systems like I used to, I use that as a reference to shake cobwebs loose,... and it comes back. Just shooting the breeze about this is shaking the cobwebs loose.

nice for you to bring it up and share...

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Codemaster
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#15
In reply to #14

Re: Calculating Steam Velocity through Pipe

12/09/2020 10:31 AM

No problem, good to share these things!

BTW, when I reply on CR4, I get message below.

"Your access to TinyMCE will expire on 25 Februrary 2021. Please either contact your administrator or upgrade your account using the instructions available here."

Do you happen to know what it's all about? Do we need to do anything? Why does it only appear on hitting Reply? Perhaps I'm being over suspicious, but want to be careful.

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PWSlack
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#16
In reply to #15

Re: Calculating Steam Velocity through Pipe

12/09/2020 10:40 AM

Just buy a box of mouse repellent.

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Codemaster
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#19
In reply to #16

Re: Calculating Steam Velocity through Pipe

12/09/2020 3:12 PM

Ha ha ha

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#17
In reply to #15

Re: Calculating Steam Velocity through Pipe

12/09/2020 12:12 PM

Yep,... it was brought up here...

I, myself is holding off (procrastinating) doing anything about it for a while...

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Codemaster
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#18
In reply to #17

Re: Calculating Steam Velocity through Pipe

12/09/2020 3:10 PM

Thanks for that, I hadn't noticed that thread.

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PWSlack
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#4

Re: Calculating Steam Velocity through Pipe

12/08/2020 10:30 AM

If the answer is more than 10m/s or 30ft/s, then "Run, Forrest! Run!"

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#5
In reply to #4

Re: Calculating Steam Velocity through Pipe

12/08/2020 11:22 AM

To expand on that, it’s to decrease wear and tear on the system...

Unless we’re talking about steam eductors.... they’re very loud....

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PWSlack
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#6
In reply to #5

Re: Calculating Steam Velocity through Pipe

12/08/2020 11:26 AM

Yep. There are also pressure drop considerations and reaction force considerations at bends.

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phoenix911
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#7
In reply to #6

Re: Calculating Steam Velocity through Pipe

12/08/2020 11:35 AM

Do we really want to discuss hammer effect?... of course we do...

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PWSlack
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#8
In reply to #7

Re: Calculating Steam Velocity through Pipe

12/08/2020 11:39 AM

Of course. And condensate trapping and return....

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#9
In reply to #8

Re: Calculating Steam Velocity through Pipe

12/08/2020 12:06 PM

As far as condensate return... I have to say, because I really love it, is the Nicholson Commander Condensate Return Pump... if you prove me wrong,... then I’ve learned something new today.

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PWSlack
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#12
In reply to #9

Re: Calculating Steam Velocity through Pipe

12/09/2020 2:20 AM

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Previous in Forum: Steam Dryer Drum Pressure Vessel Registration Questions   Next in Forum: Allowable Stress for Unknown Carbon Steel Material for Manhole Plate on a Pressure Vessel

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