## Max. flow velocity limits for airpline fuel pipeline

## Max. flow velocity limits for airpline fuel pipeline

(OP)

In the design and construction of the airport hydrant system, the max flow velocity limits in pipelines is set as 1.83 m/s by API. There are other max set numbers for this velocity in other codes. Could anyone tell me please what the main consideration and how the numbers were derived? What's the original document regarding theses numbers?

Another question is why the bottom slope of the conedown vertical tankis is set as 1:30 (at least) by the codes? Is 1:20 ok too? Where is the original occurrance of this number?

Thanks ahead for all answers.

Shouxi Wang

Another question is why the bottom slope of the conedown vertical tankis is set as 1:30 (at least) by the codes? Is 1:20 ok too? Where is the original occurrance of this number?

Thanks ahead for all answers.

Shouxi Wang

## RE: Max. flow velocity limits for airpline fuel pipeline

6 ft/s is a reasonably sensible rule of thumb limit to balance piping costs with pumping costs, and avoiding erosion by a clean fluid.

Matt

## RE: Max. flow velocity limits for airpline fuel pipeline

## RE: Max. flow velocity limits for airpline fuel pipeline

1:30 would be better to help keep water out of airplane fuel.

## RE: Max. flow velocity limits for airpline fuel pipeline

There are, to my knowledge, no fixed velocities in any code. There are a number of recommended limits or guidance, but no fixed number.

The issues to bear in mind are friction losses, surge pressures and static charge for high velocities. If velocity is low the pipe is bigger than it needs to be and hence costs more, you might not be able to clear air from the line and there is a lot more volume.

For aircraft fuel you want to make sure any water is drained off and not allowed to sit there. A slope of 1:30 allows for good draining.

Remember - More details = better answers

Also: If you get a response it's polite to respond to it.

## RE: Max. flow velocity limits for airpline fuel pipeline

Shouxi Wang

## RE: Max. flow velocity limits for airpline fuel pipeline

Sorry for the question. But now we are bothering by this numbers and trying to find if we can change it little bit for better engieering.

Shouxi Wang

## RE: Max. flow velocity limits for airpline fuel pipeline

## RE: Max. flow velocity limits for airpline fuel pipeline

http://pipelineandgasjournal.com/jet-fuel-pipeline...

API 2003.

https://law.resource.org/pub/us/cfr/ibr/002/api.20...

Vertical tanks have a cone down bottom with a minimum 1:30 slope to the centre sump, appropriate tank lining, filter/water separators, a manhole chamber if tank is buried Underground tanks are sloped to provide a low point for removal of water and other contaminants.

http://www.unlb.org/showbinarydata.asp?q=U%01%AC~b...'L%14%A0%90%B3%25%0B%1E%95l%04%B5a%7Flg%04%A3%13%FC%3C%FE%E9L%23%92%CA%14%12%92r%E3_%D5

## RE: Max. flow velocity limits for airpline fuel pipeline

Especially grateful to Bimr. Your imformation are very helpful. Could you please resend the 3rd link please? I couldn't open it.

Shouxi

## RE: Max. flow velocity limits for airpline fuel pipeline

Keeping the velocity below 1.83 m/s (6 ft/s) would match the first of of these criteria (i.e. VxD<0.38) for pipes up to about 8"NB.

Katmar Software - AioFlo Pipe Hydraulics

http://katmarsoftware.com

"An undefined problem has an infinite number of solutions"

## RE: Max. flow velocity limits for airpline fuel pipeline

http://www.unlb.org/showbinarydata.asp?q=U%01%AC~b...'L%14%A0%90%B3%25%0B%1E%95l%04%B5a%7Flg%04%A3%13%FC%3C%FE%E9L%23%92%CA%14%12%92r%E3_%D5

## RE: Max. flow velocity limits for airpline fuel pipeline

Shouxi