Velocidades Recomendadas Para Lechadas (Slurries)

Velocidades recomendadas para lechadas (Slurries)
Slurry Transport and Minimum Flow Velocity
A suspension of solid particles in a liquid, as in a mixture of cement, clay, coal dust, manure, meat,etc. - with water is often called a slurry. In transport systems for slurries it's important to avoid the solids to settle. This can be done by keeping the fluid speed in the pipe lines above certainlevels. The levels depends primary on the type and size of the solid:

Flow Velocity Type of Solids Size of Solids (Mesh No) m/s ft/s

Fine

over 200

1 – 1.5

3–5

Sand

200 – 20

1.5– 2

5–7

Coarse

20 – 4

2 – 3.25

7 – 11

Sludge

3.25 – 4.25

11 – 14

A pipeline transport system may under certain circumstances be nearly self cleaning. When solids settles thearea of the pipe will decrease and the fluid speed increase until the state of equilibrium where the speed is so high that settling is avoided. The speed should be increased in lifting lines bydecreasing the piping diameter. At the end of the pipelines the speed should be slowed down by increasing the pipeline diameters.

Mesh definition
• •

Mesh is the number of opening per inch of a screen- "a 100 mesh screen" Mesh is often used to measures the size of particles - "100 mesh powdered sand"

Velocidades recomendadas para vapor
Velocity Steam System (m/s) (ft/s)

Saturated Steam -high pressure

25 - 40

82 - 131

Saturated Steam - medium and low pressure

30-40

99 - 131

Saturated Steam at peak load

< 50

< 164

Steam and Water mix

< 25

< 82Superheated Steam

35 - 100

100 - 300

Velocidades recomendadas para Agua
Maximum Velocity Application (m/s) (ft/s)

Tap water (low noise)

0.5 - 0.7

1.6 - 2.3

Tap water

1.0 - 2.53.3 - 8.2

Cooling water

1.5 - 2.5

4.9 - 8.2

Suction boiler feed water

0.5 - 1.0

1.6 - 3.3

Discharge boiler feed water

1.5 - 2.5

4.9 - 8.2

Condensate

1.0 - 2.0

3.3...