×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Hello Can anyone tell me where ca

Hello Can anyone tell me where ca

Hello Can anyone tell me where ca

(OP)
Hello
Can anyone tell me where can i find the formula of the maximum velocity of a material (taking under consideration the fluid type).
Can i find it in the ASTM Specifications ?

RE: Hello Can anyone tell me where ca

working from memory, I'm not coming up with a velocity as a material characteristic, but I sure don't know everything.

Could you please add some background and context to your question?

Mike Halloran
Pembroke Pines, FL, USA

RE: Hello Can anyone tell me where ca

If you mean maximum velocity of a fluid, then no, there are no specifications which list this sort of thing.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Hello Can anyone tell me where ca

But there are lots of 'rules of thumb' that go into fluid velocity.
Is the fluid clean? is it corrosive? Both of those would reduce the max velocity.
What is the piping material?
Al and Cu (brass as well) have fairly modest upper velocities as they will erode in service. It is expected.
Plain steel is a bit higher, and stainless steel and Ni alloys are really only limited if you have abrasives in the fluid and by your pumping (friction) losses.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Hello Can anyone tell me where ca

(OP)
Maximum velocity is a characteristic of materials and it changes with the fluid type by a formula, and it must be used for the determination of the pipe diameter. That’s why I’m asking about it, because I can’t use any of the values based on experience.
my fluid type : -steam
-treated water
-boiler feed water
And I have been guided in this way by my Supervisor

RE: Hello Can anyone tell me where ca

Is your supervisor thinking of FAC (Flow Assisted Corrosion)? In which case, appropriate chromium equivalent chemistry of low carbon steel is all that is required in high velocity boiler feed systems in the temperature range of about 200F to 450F. In pipe immediately downstream of the bypass valve, the fluid velocity is near sonic, initially. Your supervisor is wrong in believing that fluid Velocity is characteristic of the material. As previously stated the material's ability to resist corrosion.erosion in high velocity fluids is dependent on its alloy chemistry.

RE: Hello Can anyone tell me where ca

(OP)
I think that may be what he meant.
Thank you for your time, and where may i find more informations on the material's ability to resist corrosion and erosion in high velocity ?

RE: Hello Can anyone tell me where ca

Aaahhh .... The phrase that strikes terror in the hearts of all engineers on this website ...

" And I have been guided in this way by my Supervisor [/b]"

MJCronin
Sr. Process Engineer

RE: Hello Can anyone tell me where ca

Go to the Web and look up FAC. A number of publications have been made available. Essentially you need a CrE of .17 or greater to meet the corrosion resistance. At least one Japanese mill will be able to provide it in SA-106 C. Because of limited availability, a number of boiler manufacturers and Power Engineers specify SA-335 P11 for these applications. Welding wire (Metal Cored) meeting the CrE can be obtained from DEVASCO in Houston.

MJCronin: So right - the blind leading the blind!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources