×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Parallel pump operations-power failure

## Parallel pump operations-power failure

(OP)
we are planning to run two identical centrifugal pumps in parallel. one is motor driver, the other is steam turbine driver.
During normal opertions, a power failure occured, how fast can the turbine pump speed up to make up with the loss flow? lets say from 1700 RPM to 1750 RPM, one, two, five minutes ??

### RE: Parallel pump operations-power failure

The way to solve your problem is to use the "angular impulse"= "change in angular momentum" in order to do this you would need to know the "moment of inertia" of the turbine and the change in the torque applied to the turbine
after the power failure.
The equation then :-

Txt=I x (w1-w0)

where T=the change in torque in your case
I=moment of inertia of turbine
w1,w0= the final and initial angular velocities of the
turbine which you can calculate from the r.p.m
you have posted.
t= time required to reach final angular velocity

so transposing the formula to give t

t=I x (w1-w0)/(T)

note there are no losses for friction etc within the above formula.

hope this helps

### RE: Parallel pump operations-power failure

(OP)
Thanks, desertfox.

#### 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.

#### Resources

White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each personâ€™s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now
White Paper - Medical Device Design Control
Medical device product development is a highly integrated and regulated process. Implementation of a requirements tracking solution requires attention to a variety of nuanced topics. When presented with the task of tracking the many concept relationships in a project of this type, the initial software solution of choice tends to be a two-dimensional text systems. 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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!