Ammonia Gas Spherical Storage Tank SS-101: Technological Institute of The Philippines [PDF]

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Technological Institute of the Philippines

AMMONIA GAS SPHERICAL STORAGE TANK SS-101

Technological Institute of the Philippines EQUIPMENT SPECIFICATION Ammonia Storage Tank Data Sheet

EQUIPMENT TAG: SS-101 DESCRIPTION (FUNCTION) To store Ammonia Gas. Sheet No. 1 Operating Data No. Required 5 Material of Carbon Steel Construction (S42; Graded A) Operating 30 ºC Operating 3.5 atm temperature pressure Contents Ammonia Tank Capacity 8373.78 m3 Vessel data Inside Diameter 25.760 m Outside Diameter 25.785 m Shell Thickness 12.689 mm Circumference of the Sphere 81.006 m Actual Dimension of the tank Corrosion allowance 2 mm Actual tank circumference 81.006 m Actual Tank Diameter 25.785 m Actual Inside Diameter 25.760 m Actual No. of Layers 14 layers Total no. of plates 57 plates Inlet Nozzle Diameter 3 -inch, Schedule 5S Outlet Nozzle Diameter 2 ½-inch, Schedule 80S

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Technological Institute of the Philippines Data and Assumptions: 1. Mass flow rate = 2,256.57 kg/hr 2. 20% Volumetric Allowance

Design Requirements: a. Material of Construction b. Diameter c. Shell Thickness

Design Calculations: From Table 2-143, Perry’s Chemical Engineers’ Handbook, 8th Ed.: T= 30˚C ρ = 9.107

kg m3

Capacity of the Tank (for the basis of 7 days, or 168 hrs)

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Technological Institute of the Philippines

kg 2256.57 hr x 168 hrs V= = 𝟒𝟏𝟔𝟐𝟕. 𝟕𝟑 𝐦𝟑 kg 9.107 3 m Solving for the diameter using spherical tank (Silla, 2003) Calculating the number of tanks:

N=

41627.73 m3 = 4.97 = 𝟓 𝐭𝐚𝐧𝐤𝐬 m3 8373.78 tank

Tank Diameter

VTheo =

πD3 6

Solving for inside diameter of the vessel (using tank capacity) πD3 8,373.78 m = 6 3

𝐃 = 𝟐𝟓. 𝟏𝟗𝟓 𝐦 Solving for the Surface Area of Sphere SA = πD2 SA = 25.1952 π = 1994.245 m2 𝐒𝐀 = 𝟔𝟖𝟑𝟐. 𝟖𝟎 𝐟𝐭 𝟐 Standard size for plates is 6 x 20 ft.

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Technological Institute of the Philippines Solving for number of plates

Nplates

6832.80 ft2 = = 56.940 = 𝟓𝟕 𝐩𝐥𝐚𝐭𝐞𝐬 ft2 (6 x 20) plate

Using N = 57 plates

SA = 57 plates x

120 ft2 = 𝟔𝟖𝟒𝟎 𝐟𝐭 𝟐 plate

𝐒𝐀 = 𝟐𝟎𝟖𝟒. 𝟖𝟑𝟐 𝐦𝟐 2084.832 = πD2 𝐃 = 𝟐𝟓. 𝟕𝟔𝟎 𝐦

Solving for inside diameter of the vessel (using liquid level) 41627.73 m3 πD3 = 5 6 𝐃 = 𝟐𝟓. 𝟏𝟒𝟔 𝐦

Volumetric Allowance = [(

25.760 m 3 ) − 1] x 100 % = 𝟖. 𝟐𝟐% 25.146 m

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Technological Institute of the Philippines Design Pressure From Ammonia Spherical Tank, Pd = 3.5 atm = 354637.5 Pa 𝐏𝐝 = 𝟑𝟓𝟒𝟔𝟑𝟕. 𝟓 𝐏𝐚 Solving Shell Thickness From Table 13.2 Typical Maximum Allowable Stresses for Plates under ASME BPV Code Sec. VIII (R K Sinnott) Carbon Steel, S = 360

N mm2

From Equation 13.39, (Chemical Engineering Design and Principles by Coulson and Richardson) t=

Pd Ri 2SE − 0.2Pd

Where: t = shell thickness Pd = design pressure Ri =internal diameter S = design stress E = joint efficiency

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Technological Institute of the Philippines

(0.3546375 t= (2)(1)(360

N ) (25760 mm) mm2

N N ) − 0.2(0.3546375 ) 2 mm mm2

𝐭 = 𝟏𝟐. 𝟔𝟖𝟗 𝐦𝐦 Outside Diameter Do = Di + 2t Do = 25.760 m + 0.025378 m 𝐃𝐨 = 𝟐𝟓. 𝟕𝟖𝟓 𝐦 Nozzle Sizing Basis: As per Engineering Standard for Process Design (Standard Code IPS-PR-880) 1. For fluid inlet (Gas or Liquid): ρv2 < 1000 2. For gas outlet: ρv2 < 3600 3. For liquid outlet: v= 1 m/s Feed Inlet Nozzle Density (kg/m3)

9.107

ρv2 (kg/ms2)

1000

v=√

1000 kg/ms 2 = 10.479 m/s 9.107 kg/m3

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Technological Institute of the Philippines Feed Flow Rate= 0.626825 kg/s A=

Dn = √

m 0.626825 kg/s = = 6.568 x 10−3 m2 ρv (9.107 kg )(10.479 m) s m3

4A 4(6.568 x 10−3 m2 ) √ = = 0.0914 m ≈ 91.447 mm π π

Dn = 3.600 in, therefore use 3-inch Nominal Pipe Size, Schedule 5S. Gas Outlet Nozzle Density (kg/m3)

9.107

ρv2 (kg/ms2)

3600

Outlet Flow Rate= 0.338 kg/s

v=√

A=

Dn = √

3600 kg/ms 2 = 19.882 m/s 9.107 kg/m3

m 0.626825 kg/s = = 3.462 x 10−3 m2 ρv (9.107 kg )(19.882 m) s m3

4A 4(3.462 x 10−3 m2 ) =√ = 0.06639 m ≈ 66.39 mm π π

Dn = 2.614 in, therefore use 2 1/2-inch Nominal Pipe Size, Schedule 80S.

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Technological Institute of the Philippines

CARBON DIOXIDE SPHERICAL STORAGE TANK SS-102

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Technological Institute of the Philippines EQUIPMENT SPECIFICATION Ammonia Storage Tank Data Sheet

EQUIPMENT TAG: SS-102 DESCRIPTION (FUNCTION) To store Carbon Dioxide Gas. Sheet No. 1 Operating Data No. Required 32 Material of Carbon Steel Construction (S42; Graded A) Operating 30 ºC Operating 3.5 atm temperature pressure Contents Ammonia Tank Capacity 14950.186 m3 Vessel data Inside Diameter 30.564 m Outside Diameter 30.594 m Shell Thickness 15.06 mm Circumference of the Sphere 96.019 m Actual Dimension of the tank Corrosion allowance 2 mm Actual tank circumference 96.019 m Actual Tank Diameter 30.594 m Actual Inside Diameter 30.564 m Actual No. of Layers 14 layers Total no. of plates 80 plates Inlet Nozzle Diameter 5 -inch, Schedule 5S Outlet Nozzle Diameter 3 1/3 inch, Schedule 80S

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Technological Institute of the Philippines Data and Assumptions: 3. Mass flow rate = 4,994 kg/hr 4. 20% Volumetric Allowance

Design Requirements: a. Material of Construction b. Diameter c. Shell Thickness

Design Calculations: From Table 2-143, Perry’s Chemical Engineers’ Handbook, 8th Ed.: T= 30˚C ρ = 1.777

kg m3

Capacity of the Tank (for the basis of 7 days, or 168 hrs)

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Technological Institute of the Philippines

kg 4,994 hr x 168 hrs V= = 𝟒𝟕𝟐𝟏𝟑𝟗. 𝟓𝟔 𝐦𝟑 kg 1.777 3 m Solving for the diameter using spherical tank (Silla, 2003) Calculating the number of tanks:

N=

472139.56 m3 = 13.58 = 𝟑𝟐 𝐭𝐚𝐧𝐤𝐬 m3 14950.186 tank

Tank Diameter

VTheo =

πD3 6

Solving for inside diameter of the vessel (using tank capacity) πD3 14950.186 m = 6 3

𝐃 = 𝟑𝟎. 𝟓𝟔𝟒 𝐦 Solving for the Surface Area of Sphere SA = πD2 SA = 30.5642 π = 2934.74 m2 𝐒𝐀 = 𝟗𝟔𝟐𝟖. 𝟒𝟑 𝐟𝐭 𝟐 Standard size for plates is 6 x 20 ft.

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Technological Institute of the Philippines Solving for number of plates

Nplates

9628.43 ft2 = = 80.24 = 𝟖𝟎 𝐩𝐥𝐚𝐭𝐞𝐬 ft2 (6 x 20) plate

Using N = 80 plates

SA = 80 plates x

120 ft2 = 𝟗𝟔𝟐𝟖. 𝟒𝟑𝐟𝐭 𝟐 plate

𝐒𝐀 = 𝟐𝟗𝟑𝟒. 𝟕𝟒𝟒 𝐦𝟐 2934.744 = πD2 𝐃 = 𝟑𝟎. 𝟓𝟔𝟒 𝐦

Solving for inside diameter of the vessel (using liquid level) 472139.56 m3 πD3 = 32 6 𝐃 = 𝟑𝟎. 𝟒𝟑𝟎 𝐦

Volumetric Allowance = [(

30.564 m 3 ) − 1] x 100 % = 𝟏. 𝟑𝟑% 30.430 m

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Technological Institute of the Philippines Design Pressure From Ammonia Spherical Tank, Pd = 3.5 atm = 354637.5 Pa 𝐏𝐝 = 𝟑𝟓𝟒𝟔𝟑𝟕. 𝟓 𝐏𝐚 Solving Shell Thickness From Table 13.2 Typical Maximum Allowable Stresses for Plates under ASME BPV Code Sec. VIII (R K Sinnott) Carbon Steel, S = 360

N mm2

From Equation 13.39, (Chemical Engineering Design and Principles by Coulson and Richardson) t=

Pd Ri 2SE − 0.2Pd

Where: t = shell thickness Pd = design pressure Ri =internal diameter S = design stress E = joint efficiency

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Technological Institute of the Philippines

(0.3546375 t= (2)(1)(360

N ) (30564mm) mm2

N N ) − 0.2(0.3546375 ) 2 mm mm2

𝐭 = 𝟏𝟓. 𝟎𝟔 𝐦𝐦 Outside Diameter Do = Di + 2t Do = 30.564 m + 0.03012 m 𝐃𝐨 = 𝟑𝟎. 𝟓𝟗𝟒 𝐦 Nozzle Sizing Basis: As per Engineering Standard for Process Design (Standard Code IPS-PR-880) 4. For fluid inlet (Gas or Liquid):2 < 1000 5. For gas outlet: ρv2 < 3600 6. For liquid outlet: v= 1 m/s Feed Inlet Nozzle Density (kg/m3)

9.107

ρv2 (kg/ms2)

1000

v=√

1000 kg/ms 2 = 10.479 m/s 9.107 kg/m3

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Technological Institute of the Philippines Feed Flow Rate= 1.248 kg/s A=

Dn = √

m 1.248 kg/s = = 0.013 m2 ρv (9.107 kg )(10.479 m) s m3

4A 4(0.013 m2 ) √ = = 0.129 m ≈ 128.65 mm π π

Dn = 5.065 in, therefore use 5-inch Nominal Pipe Size, Schedule 5S. Gas Outlet Nozzle Density (kg/m3)

9.107

ρv2 (kg/ms2)

3600

Outlet Flow Rate= 1.38 kg/s

v=√

A=

Dn = √

3600 kg/ms 2 = 19.882 m/s 9.107 kg/m3

m 1.387 kg/s = = 7.660 x 10−3 m2 ρv (9.107 kg )(19.882 m) s m3 4A 4(7.660 x 10−3 m2 ) =√ = 0.099m ≈ 98.76 mm π π

Dn = 3.89 in, therefore use 3 1/3-inch Nominal Pipe Size, Schedule 80S.

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