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The vessel is a kind of storage tanks. In general, a large-scaled storage container is called the tank while a small-scaled storage container is called the vessel. A storage facility, storing gas contents using high pressure, is especially called the pressure vessel. |
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In general, this type of vessel is designed and manufactured to endure high pressure for storage, reaction and separation of gasified contents at chemical plants, which is called the reactor or the drum (separator, holder accumulator, etc.) in the field. (over 10kg/§²g for Pressure Gas and over 2 kg/§²g for Liquefied Gas) |
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| a. L/D Ratio |
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Normal Case: 1.5 < L/D < 5.0 |
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50 ~ 600 psi : 3.0 < L/D < 4.0 |
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600 psi : 4.0 < L/D < 5.0 |
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Storage Tank : API 650, API |
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| b. Head ÀÇ ¼±Á¤ |
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10% Dished Head: Diameter of Container¡´ 15ft and Pressure ¡Â 100psi |
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2:1 Elliptical Head: Diameter of Container¡´ 15ft and Pressure ¡Ă 100psi |
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Hemispherical Head : In case diameter is 15ft or larger regardless of pressure |
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| c. Selecting Liquid Level |
| : To be selected considering operational flexibility required for purpose of process and enough time for response to emergent situation. |
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High Level: 3min ¡ 5min (Process Control: 2min ¡ 3min, Device Protection: 1min ¡ 2min) |
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Low Level: 1min ¡ 2min (Device Protection: 1min ¡ 2min |
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Minimum Gap between High Level and Low Level: 14 inches |
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| Vertical vessel with Wire mesh |
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Note 1 : Minimum 300mm (12inches) |
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Note 2 : the largest value shall be used
Hd ¡Ă 18"
Hd ¡Ă 0.25D (D=Drum diameter, inches) |
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Note 3 : Minimum 300mm (12 inches) |
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Note 4 : Minimum 150mm (6inches) |
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Note 5 : Minimum 100m (refer to the detail) |
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Note 6 : (D-Dm) ¡Ă 100mm (4inches) for support ring |
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Vessel : ASME SEC, vIII, Div.1(98ED + '99Add) |
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Material : TEMA "R"(8th ED) |
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Flanges (size < 24") : ASME B 16.5 (size > 24") : ASME B 16.47 Seties "A" |
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Painting for External & Internal surface : As per spec. |
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Transportation, installation and other details shall be carried out according to specifications and contract. |
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The above mentioned descriptions can be changed as to experience of installers and conditions of a site. |
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