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Ammonia storage tank design

Known parameters:

Maximum temperature: T = 50 ℃

Nominal diameter: DN = 3000mm

Barrel length: L = 4500mm

 Process to determine the size

 Volume of the tank

Barrel length: L = 4500mm nominal diameter: DN = 3000mm

The volume of the cylindrical drum is: (1.1)

The total surface area of ​​the inner cylinder: (1.2)

Head wall thickness of 22mm, then take a straight edge height is 50mm. By the look-up table

The head of the total volume:

The surface area of ​​a single head:

Head of the total internal surface area is:

The total volume of the cylinder is: V =

The total surface area of ​​the cylinder:

Aspect ratio: (1.3)

  Process calculation

 Cylinder wall thickness calculation

According to the formula: (2.1)

Where: - calculated pressure cylinder, MPa;

 - Inner diameter of the cylinder, mm;

- Plate in the design temperature t under the allowable stress, MPa;

  - Weld joint factor, ≤ 1;

In the design temperature of 50 ℃, when the saturated vapor pressure of ammonia (absolute pressure),

Table tank pressure:,

Safety valve on the container when taking the design pressure of 1.05 to 1.1 for the maximum working pressure. I.e.: P = 1.1

16MnR 40 ℃ when the allowable pressure: (see table)

Nominal diameter Di = 3000mm

 (Double-sided butt welds, 100% testing, see Table)

Because ammonia has a certain resistance, therefore a single etching, taking

Lookup: Take Steel negative deviation

Then calculate the wall thickness of the cylinder

After the round, the nominal thickness of the cylinder is δ

Head wall thickness calculation

The design uses a standard elliptical head (2:1) ie: K (shape factor) = 1.0.

According to the formula, the design of the head thickness is: (2.2)

Lookup: Take negative deviation steel,

The wall thickness of the cylinder is calculated as:

In the above formula

(Maximum width of steel due to 3m, this tank diameter of 3000mm so after punching head welding required).

Other symbols are the same before.

After considering stamping thinning, take the nominal thickness of round steel production 16MnR head.

 Hydrostatic Test

According to the formula is: (2.3)

Where:

     (Look-up table :)

It meets the requirements of process conditions.

Supports

2.4.1 Bearing selection

Carriage for supporting the weight of the container, the container and the container position is fixed in a stable operation. Horizontal cylindrical vessel pedestal into the saddle, seat and leg circles categories. Common horizontal vessels and large horizontal tanks are mostly used saddle. Mainly due to the saddle bearing capacity better and smaller local resistance to the cylinder, so the use of the saddle.

Saddles are divided into light (A) and heavy (B) two categories, each form is divided into fixed bearing saddle (F) and the sliding bearing (S), F-type and S on a container type is always paired.

The design of the tank volume is small and since the aspect ratio is small, the double-saddle type A, in which one type to the other is S-F.

2.4.2 Calculation of the saddle

First estimates saddle load.

The total mass of the tank:

Where: m1 is the cylinder mass (kg), m2 is head mass (kg), m3 of liquid ammonia mass (kg), m4 as an attachment mass (kg).

Cylinder of mass m1

   DN = 3000mm, the tube section, the mass per meter of 1640kg (look-up table 4 too)

Therefore

Head of mass m2

DN = 3000mm, straight edge height h = 50mm in standard oval head, its quality is 1780kg (look-up table 6),

Therefore

Ammonia mass m3

In the above formula: For loading coefficient, 0.7; V is the tank volume, V = 39.58m3

Liquid ammonia at-200C when the density of 665kg/m3.

Therefore: 18424.5kg

Quality accessories:

Manhole weighing about 200kg, total weight about other interfaces tube 350kg.

Then: m4 = 550kg

After the above calculated:

Since each saddle about 146kN load to bear, so use a light pad corners with 1200's saddle, that JB/T4712.3-2007 saddle A3000-F, JB/4712.3-2007 saddle A3000-S.

Table 3.1 A series of parameter type bearing size

Ammonia storage tank design

Known parameters:

Maximum temperature: T = 50 ℃

Nominal diameter: DN = 3000mm

Barrel length: L = 4500mm

 Process to determine the size

 Volume of the tank

Barrel length: L = 4500mm nominal diameter: DN = 3000mm

The volume of the cylindrical drum is: (1.1)

The total surface area of ​​the inner cylinder: (1.2)

Head wall thickness of 22mm, then take a straight edge height is 50mm. By the look-up table

The head of the total volume:

The surface area of ​​a single head:

Head of the total internal surface area is:

The total volume of the cylinder is: V =

The total surface area of ​​the cylinder:

Aspect ratio: (1.3)

  Process calculation

 Cylinder wall thickness calculation

According to the formula: (2.1)

Where: - calculated pressure cylinder, MPa;

 - Inner diameter of the cylinder, mm;

- Plate in the design temperature t under the allowable stress, MPa;

  - Weld joint factor, ≤ 1;

In the design temperature of 50 ℃, when the saturated vapor pressure of ammonia (absolute pressure),

Table tank pressure:,

Safety valve on the container when taking the design pressure of 1.05 to 1.1 for the maximum working pressure. I.e.: P = 1.1

16MnR 40 ℃ when the allowable pressure: (see table)

Nominal diameter Di = 3000mm

 (Double-sided butt welds, 100% testing, see Table)

Because ammonia has a certain resistance, therefore a single etching, taking

Lookup: Take Steel negative deviation

Then calculate the wall thickness of the cylinder

After the round, the nominal thickness of the cylinder is δ

Head wall thickness calculation

The design uses a standard elliptical head (2:1) ie: K (shape factor) = 1.0.

According to the formula, the design of the head thickness is: (2.2)

Lookup: Take negative deviation steel,

The wall thickness of the cylinder is calculated as:

In the above formula

(Maximum width of steel due to 3m, this tank diameter of 3000mm so after punching head welding required).

Other symbols are the same before.

After considering stamping thinning, take the nominal thickness of round steel production 16MnR head.

 Hydrostatic Test

According to the formula is: (2.3)

Where:

     (Look-up table :)

It meets the requirements of process conditions.

Supports

2.4.1 Bearing selection

Carriage for supporting the weight of the container, the container and the container position is fixed in a stable operation. Horizontal cylindrical vessel pedestal into the saddle, seat and leg circles categories. Common horizontal vessels and large horizontal tanks are mostly used saddle. Mainly due to the saddle bearing capacity better and smaller local resistance to the cylinder, so the use of the saddle.

Saddles are divided into light (A) and heavy (B) two categories, each form is divided into fixed bearing saddle (F) and the sliding bearing (S), F-type and S on a container type is always paired.

The design of the tank volume is small and since the aspect ratio is small, the double-saddle type A, in which one type to the other is S-F.

2.4.2 Calculation of the saddle

First estimates saddle load.

The total mass of the tank:

Where: m1 is the cylinder mass (kg), m2 is head mass (kg), m3 of liquid ammonia mass (kg), m4 as an attachment mass (kg).

Cylinder of mass m1

   DN = 3000mm, the tube section, the mass per meter of 1640kg (look-up table 4 too)

Therefore

Head of mass m2

DN = 3000mm, straight edge height h = 50mm in standard oval head, its quality is 1780kg (look-up table 6),

Therefore

Ammonia mass m3

In the above formula: For loading coefficient, 0.7; V is the tank volume, V = 39.58m3

Liquid ammonia at-200C when the density of 665kg/m3.

Therefore: 18424.5kg

Quality accessories:

Manhole weighing about 200kg, total weight about other interfaces tube 350kg.

Then: m4 = 550kg

After the above calculated:

Since each saddle about 146kN load to bear, so use a light pad corners with 1200's saddle, that JB/T4712.3-2007 saddle A3000-F, JB/4712.3-2007 saddle A3000-S.

Table 3.1 A series of parameter type bearing size