×
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.

# BOILER BLOWDOWN CALCULATION

## BOILER BLOWDOWN CALCULATION

(OP)
Hello,

Can anyone tell me how to calculate blowdown time for a 3/4" pipe? I have made calculation having a data for 2" pipe or more.

Thanks.

### RE: BOILER BLOWDOWN CALCULATION

Do you want to blow down the pressure in a length of pipe to atmospheric pressure?

Do you want to open a valve at one end of a pipe for long enough to completely replace the standing contents of the pipe with fresh ones?

Or do you want to know how long to blow down a boiler connected to its blowdown tank with 3/4" pipe?

Or are you asking what the dwell time in the pipe is for a continuous blowdown line from the boiler to the blowdowns heat exchanger?

Remember: better questions yield better answers.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

### RE: BOILER BLOWDOWN CALCULATION

(OP)
Sorry for not clarifying the question much. I am asking that I have a boiler that undergoes intermittent blowdown to maintain required TDS. I want to know how much blow down in terms of time like minutes would be required to achieve required TDS. Like the TDS of boiler water is 4000 ppm. I want to reduce it till 3300 ppm. Then how much minutes would be consumed by a 3" blowdown pipe to achieve this much TDS?

Obviously the calculation involves boiler capacity and pressure. I have done the calculation but the data available was for 2" pipe minimum. I want to know about 3/4" pipe. Hope it will clarify

### RE: BOILER BLOWDOWN CALCULATION

Such calculations are beyond me, but as a steam plant operator I'd dare say this would typically be determined empirically, viz., the operators would note the before TDS, blow down for a specified and recorded interval, then do the same thing the next day taking into consideration how much and which chemicals have been fed to said boiler in that 24 hour period, and so on, adjusting blowdown time on a rolling basis as needed to achieve the required TDS.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

#### 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 â€“ Your Construction ERP RFP Checklist
Selecting business software for a medium to enterprise-sized construction concern is extremely challenging in large part because most enterprise resource planning (ERP) suites originated in the world of repetitive manufacturing and are therefore a poor fit for a project and asset-centric business. However, midsize to large contractors need the predictable, auditable processes that ERP delivers. 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!