A presentation onPressure drop and Diffuser design calculation

and its advantage

Submitted by :- Submitted to :-Sachin Sahu M.K Nayak (GET Production) (G.M Production)

Content

1. Pipe line design

2. Pipe line inside of Aeration

3. Pipeline layout in both aeration tank

4. Diffuser design view with different angles

5. Equivalent length of 200 mm pipe line

6. Pressure drop calculation in all pipes

7. Approx. velocity at outlet of the diffuser

8. Advantage of recommended design

9. Conclusion

200cm 200cm

From Blower no.

385 cm

95cm

90 DegElbow

From Blower no.

4

From Blower no.

1 & 2

All pipe dia except outlet of blower 1 & 2 is 200 mm

135cm90 DegElbow

295cm

105cm

To aeration tank no.2Proposed layout for

blower outlet

Total pipeline lay out diagram

28200cm

28200cm

81

00

cm

295cm

75mm dia pipe

200 mm dia pipe

200 mm pipe diagram above aeration tank no.2

28200cm

28200cm

81

00

cm 295cm75mm dia pipe 200 mm dia pipe

Top view of diffuser inside aeration tank no. 2

28200mm

28200mm

81

00

cm75mm diapipe

200 mm diapipe

28200mm

28200mm

9.7

00

cm

295cm75mm diapipe

200 mm diapipe

9.7

m 295cm

8.1

m

Tank no. 2

Tank no. 1

Top view of aeration tank no. 1 & 2 with diffuser

295cm

Top view

Lateral line 75mm

1m

Diffusers 63mm

Ø

MS Support for X

Reducing vibration

Areation tank bottom

UNKNOWN

1. Angle b/w diffuser

2. Height above bottom (X)

Front view

3304.2 mm

591.6mm

63mm diadiffuser

40

0 m

m

Diffuser view with different angles

28200cm

28200cm

81

00

cm

295cm

75mm dia pipe

200 mm dia pipe

Top view

Lateral line 75mm

1m

Diffusers 63mm

Ø

MS Support for X

Reducing vibration

Areation tank bottom

UNKNOWN

1. Angle b/w diffuser

2. Height above bottom (X)

Front view

3304.2 mm

591.6mm

63mm dia diffuser

40

0 m

m

Angle View

Diffuer View Bottom

Triangle Support

Diffuser views

Lateral line 75mm

1m

Diffusers 63mm

Ø

MS Support for X

Reducing vibration

Areation tank bottom

UNKNOWN

1. Angle b/w diffuser

2. Height above bottom (X)

Front View

Equivalent Pipe length calculation(200mm)

• Pipe diameter = 200mm = 0.2m

• Straight length of pipe approx = 65.615

• Total 90 degree bend in pipeline no.s = 3

• Total T joint no.s: 1

• Equivalent length of T and 90 deg bend = 3*3.7 + 3*4.4 +1*7.3= 31.6m

• Total equivalent length of 200 mm pipe for 1st Aeration tank (approx)= 67.215+31.6=98.82m

• Angle of diffuser should be at 60 degree to make strongest triangle structure to withstand vibrations.

Pressure drop calculation for pipe theoretically(200 mm) pipe (Tank 1 & 2 online)

Equivalent length of pipe = 189 to 193 meter

Pressure drop for this length of 200 mm pipe =

• Calculation output

• Flow medium: Air / gaseous

• Volume flow:: 1700 m³/h

• Weight density: 1.2754 kg/m³

• Dynamic Viscosity: 19.83 kg/ms

• Element of pipe: circular

• Diameter of pipe D: 200 mm

• Length of pipe(approx) L: 191 m

• Velocity of flow: 15.03 m/s

• Reynolds number: 193353

• Flow: turbulent

• Absolute roughness: 1.5 mm

• Pipe friction number(cast iron): 0.03

• Resistance coefficient(cast iron ) : 34.8

• Pressure drop: 52.97 mbar

• 0.05 bar

Pressure drop calculation total

1. Pressure at blower outlet is = 0.7 bar

2. Pressure at the T joint of 200 mm pipe to 75 mm pipe is = 0.065 bar

3. Now pressure at T joint of 75 mm pipe and 63 mm pipe =

4. As we knoe that pressure is related with area as = P= 1/A

5. So by this means pressure is = 3.14*0.2*0.2*0.65=9*3.14*0.075*0.075*P so by calculating

6. P = 0.52 bar

7. Total pressure drop = 0.65-0.52 = 0.13 bar

8. Again pressure at just 63 mm outlet = 3.14*0.075*0.075*0.52 = 3.14*0.063*0.063*10*P

9. Pressure comes out to be = 0.074 bar

10. Total pressure loss = 0.45 Bar

11. Pressure at that depth by water = 0.025 bar

12. Pressure difference = 0.049 bar

• Pressure inside the diffuser > pressure at the outlet by water

Now flow given out by blower is 1700 m3/hr which divides into 4 parts losses are miner so can be neglected since air is the media each part has flow of around = 1700/4 = 425 m3/hrNow this divides into 9 parts = 425/9 = 47.22 m3/hrAgain it is divided into 10 parts (63mm diffuser) = 47.22/10 = 4.72 m3/hrvelocity driven= 4.72/(3.14*0.063*0.063/4)= 94.68 m/hr or 1.6 m/s considering 10 % loss in velocity due to fitting and pressure created by water Approximately = 1.4<Velocity at diffuser outlet < 1.6 m/s

The length which is to cover the air below the diffuser is = 2.5-0.86 = 1.64 mThere is a huge pressure difference between diffuser outlet and tank bottom so air can easily touch the ground and make proper aeration.

Velocity calculation at diffuser outlet

Advantage of Recommended diffuser design over regular diffuser design Regular diffuser design Recommended Design

1. Regular diffuser is at 180 degree 2. Diffuser is straight due to which air leaving

through it have less exposure time with water3. Due to its design the sludge which is settled at

the bottom is not able to mix with water resulting deposition of sludge at the bottom of the tank.

4. Its design made it weaker to withstand vibration caused by blower and there is a huge chance of its damage.

1. Angle between the diffuser is 60 degree2. Due to its design there will be more exposure

time of air with water.3. Due to its design the possibility of deposition of

sludge at the bottom of the tank will be eliminated and mixing of oxygen with waste water is at best.

4. As it is known to us that construction made by TRIANGLE geometry is the strongest construction so it gives extra strength to it.

Sludge settled at the bottom

Lateral line 75mm

1m

Diffusers 63mm

Ø

MS Support for X

Reducing vibration

Areation tank bottom

UNKNOWN

1. Angle b/w diffuser

2. Height above bottom (X)

Sludge moving upward

Further Support required for accurate calculation

1. Pressure point at different areas of pipe line for calculating real pressure drop.

2. At what efficiency the blower is running and what amount of air it is supplying to the diffuser.

Conclusion

1. Pressure inside the diffuser is always greater then the outside water pressure.

2. New diffuser design is capable to withstand vibration caused by blower.

3. Blower no.4 is sufficient to give required pressure.

4. New diffuser design helps in proper aeration in tanks.

5. Sludge deposition in this design is less than the regular diffuser design.

“THANK YOU”