×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Steam Turbine Silencer

Steam Turbine Silencer

Steam Turbine Silencer

(OP)
Hello

iam planning to purchase steam silencer to install it on the warm up line of steam turbine
The current arrangement is there is a manual gate valve (1.5 ") at the steam turbine body which directs the steam to atmosphere to warm up the turbine

The Manual gate valve is opened gradually till reach around 5 ton/hr of steam to warm up the turbine

pressure before the manual valve = 40 bar g
Temperature before the manual valve = 440 C
Maximum Flow = 10 ton/hr

i got an offer from a silencer manufacture offersing a silencer with an inlet pressure 25 barg
and he replied with the following :
During discharge of downstream valve, the pressure inside of silencer’s diffuser will be never exceed 25 barg. Gas pressure release phenomena will be observed during discharge to atmosphere.

So I need to understand how to calculate the pressure after the manual valve to confirm acceptance of this silencer , because i have another two offers offering silencers with a design pressure 40 bar

your help is needed :)

RE: Steam Turbine Silencer

Quote:

So I need to understand how to calculate the pressure after the manual valve to confirm acceptance of this silencer

So, you may ask this vendor to present his calculation to comfirm it. But, the issue is what the actual pressure of the silencer is if the gate valve is wide open, i.e. 25barg or 40barg.

RE: Steam Turbine Silencer

Re the concern @mk3223 raises, a possible solution would be install a restriction orifice downstream of manual throttle startup/turbine warmup valve which limits the flow to 10t/hr with 40barg upstream / 25barg downstream.
Even with such a solution, the silencer would still experience 40barg if it were to be mechanically damaged or partially blocked for some reason or other(corrosion/poor fabrication/inadaquate mechanical strength of internal components to withstand high momentum forces etc).

RE: Steam Turbine Silencer

When the steam flow reaches 5 Ton/h, is the gate valve completely open?
If the valve is completely open, the present discharge capacity of the vent line will be 5 Ton/h. Installing a vent silencer that has a certain pressure drop, then the steam flow rate will be less than 5 Ton/h.
Therefore, you need to consider besides the noise level reduction and the silencer design pressure, the silencer pressure drop.
If the gate valve is not completely open when the steam flow rate reaches 5 Ton/h, how does it look from the data of the maximum flow of 10 Ton/h, it produces some pressure drop that is the margin you have to specify the silencer pressure drop.
I any case it is not a good idea operate a gate valve in a throttling position.
To help you in the design, I recommend see my paper published in HYDROCARBON PROCESSING August 2019 titled "Specify the pressure drop of a vent silencer", that deals with this topic.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close