×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Differential pressure measurement with PDT in cyclone reactor

Differential pressure measurement with PDT in cyclone reactor

Differential pressure measurement with PDT in cyclone reactor

(OP)
Dear Sir

A PDT take a measurement across tap1 (EL 1500mm) and tap 2
(EL 1000mm) so that the differential pressure reading is taken across a known distance 0.5m. And the density of particle is from 400kg/m3 to 1000 kg/m3 in this reactor fluidized bed.

I wonder which formula I can used to calculated the differential pressure drop between these two tap?

Any help and comment will be appreciated.

Thank you so much.

RE: Differential pressure measurement with PDT in cyclone reactor

(OP)
Dear professional
I am not sure this is a silly question.
I wonder which formula in the following can be applied in this case

1. delta P=delta H/density*g

or  just use

2. delta P [kg/cm2]= delta H [m] / (average density[kg/m3] / 10000)

which one is correct ?

Could any one give me a help ?

Thank you very much.

RE: Differential pressure measurement with PDT in cyclone reactor

The Delta p (in units of mmH2O) measurement output = DP*specific gravity
where specific gravity is the ratio of the density of the material to the density of water.

Water's density is 1,000 Kg/m3
The material at 400Kg/m3 has an SG of 0.4
The material at 1000Kg/m3 has an SG of 1.0

If the 500mm level were at the maximum with 100% SG 1.0 material,
the DP measurement output would be DP*1.0 = 500mm

If the 500mm level were at the maximum with 100% SG 0.4 material,
the DP measurement output would be DP*0.4 = 200mm, and need correction.

The correction for actual level is DP measurement/SG.   
200mm indicated output/0.4 = 500mm actual level.

I'm not clear how you will determine the 'average' SG of the blend.

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!


Resources