Re: "U" Blocks Pipe?
Many will say that what you want to do will not work and should be avoided but there are many systems operating with exactly that same geometry.
The bend at the bottom of the vertical drop will see some extra load and may need additional support and the next vetical rise should not occur too quickly but in general, what you are trying to acheive can work ■
Re: "U" Blocks Pipe?
Originally posted by jack hilbert
Many will say that what you want to do will not work and should be avoided but there are many systems operating with exactly that same geometry.
The bend at the bottom of the vertical drop will see some extra load and may need additional support and the next vetical rise should not occur too quickly but in general, what you are trying to acheive can work
Thank you Jack!
Can I say the horizontal line between drop and raise should better be longer than 20D? ■
Shenjie Tel:+86(0)20 83553890,83550361 Fax: +86(0)20 83542314 [email]sj@chinabulk.com[/email] [url=http://www.chinabulk.com]Sino-Auto Technology[/url]
Re: "U" Blocks Pipe?
yes, 20 pipe diameters is a good rule of thumb to use ■
Re: "U" Blocks Pipe?
I thought this 20D business was obsolete years ago! Acceleration length or bend effect length is the distance at which the pressure drop in pipe reaches the steady state straight pipe pressure drop. In lean phase system acceleration zones after the bends are mainly dependent on air velocity and normally are between 5-9 m. Academic debate is still out on it though and the range is between 3-19 m/s.
The blocking in PC lines is more closely related to Solid Loading Ratio but the velocity factor cannot be ignored and at low SLR one can get away with shorter distance between two consecutive bends than at high SLR.
That is why as Jack has said some system works at these geometries. Personally I strongly disagree with multiplying factors and have always believed that rule of thumbs are general rules and we should not apply them as standards. ■
Re: "U" Blocks Pipe?
Originally posted by Mantoo
I thought this 20D business was obsolete years ago! Acceleration length or bend effect length is the distance at which the pressure drop in pipe reaches the steady state straight pipe pressure drop. In lean phase system acceleration zones after the bends are mainly dependent on air velocity and normally are between 5-9 m. Academic debate is still out on it though and the range is between 3-19 m/s.
The blocking in PC lines is more closely related to Solid Loading Ratio but the velocity factor cannot be ignored and at low SLR one can get away with shorter distance between two consecutive bends than at high SLR.
That is why as Jack has said some system works at these geometries. Personally I strongly disagree with multiplying factors and have always believed that rule of thumbs are general rules and we should not apply them as standards.
Fully agree with your 5~9m! ■
Shenjie Tel:+86(0)20 83553890,83550361 Fax: +86(0)20 83542314 [email]sj@chinabulk.com[/email] [url=http://www.chinabulk.com]Sino-Auto Technology[/url]
Re: "U" Blocks Pipe?
Just as far as i know,The distance between two adjacent bends should be not less than 40D(Conveying pipeline bore).this ensure that there is enough distance for velocity to accelerate.For abresive material,The Radius of bends is generally about 12D.for nonabresive materials,The Radius of bends is generally about 3D.
BR ■
Re: "U" Blocks Pipe?
Just as far as i know,The distance between two adjacent bends should be not less than 40D(Conveying pipeline bore).this ensure that there is enough distance for velocity to accelerate.For abresive material,The Radius of bends is generally about 12D.for nonabresive materials,The Radius of bends is generally about 3D.
BR ■
"U" Blocks pipe?
For positive pressure dilute phase conveying some said if "U" appears in pipe arrangement the pipe will be easily blocked.
"U" means vertical down then horizontal across the road then vertical up.
Is that true? If so how can it happen? ■
Shenjie Tel:+86(0)20 83553890,83550361 Fax: +86(0)20 83542314 [email]sj@chinabulk.com[/email] [url=http://www.chinabulk.com]Sino-Auto Technology[/url]