8/18/2019 Angulo Coronamiento

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WELDED T ANKS FOR OIL STORAGE

e) Except as specified for open-top tanks in 5.9, for tanks with frangible joints per 5.10.2.6, for self-supporting roof

5.10.5, and 5.10.6, and for tanks with the flanged roof-to-shell detail described in Item f below, tank shells shal

supplied with top angles of not less than the following sizes:

For fixed roof tanks equipped with full shell height insulation or jacketing, the horizontal leg of the top shell stiffe

shall project outward. For insulation system compatibility, the Purchaser shall specify if the horizontal leg is to

larger than specified above.

b) For tanks with a diameter less than or equal to 9 m (30 ft) and a supported cone roof (see 5.10.4), the top edg

the shell may be flanged in lieu of installing a top angle. The bend radius and the width of the flanged edge s

conform to the details of Figure 5.3a. This construction may be used for any tank with a self-supporting roof (

5.10.5 and 5.10.6) if the total cross-sectional area of the junction fulfills the stated area requirements for construction of the top angle. No additional member, such as an angle or a bar, shall be added to the flanged ro

to-shell detail.

5.2 Design Considerations

5.2.1 Loads

Loads are defined as follows.

a) Dead Load (DL): The weight of the tank or tank component, including any corrosion allowance unless otherw

noted.

b) Design External Pressure ( P e): Shall not be less than 0.25 kPa (1 in. of water) except that External Pressure

shall be considered as 0 kPa (0 in. of water) for tanks with circulation vents meeting Annex H requirements. Reto Annex V for external pressure greater than 0.25 kPa (1 in. of water). Design requirements for vacu

exceeding this value and design requirements to resist flotation and external fluid pressure shall be a matte

agreement between the Purchaser and the Manufacturer (see Annex V). Tanks that meet the requirements of

standard may be subjected to a partial vacuum of 0.25 kPa (1 in. of water), without the need to provide a

additional supporting calculations.

c) Design Internal Pressure ( P i ): Shall not exceed 18 kPa (2.5 lbf/in.2).

d) Hydrostatic Test ( H t  ): The load due to filling the tank with water to the design liquid level.

e) Internal Floating Roof Loads:

1) Dead load of internal floating roof ( D f  ) including the weight of the flotation compartments, seal and all o

floating roof and attached components.2) Internal floating roof uniform live load ( L f  1) (0.6 kPa [12.5 lbf/ft

2]) if no automatic drains are provided, (0.24

[5 lbf/f 2]) if automatic drains are provided).

3) Internal floating roof point load ( L f  2) of at least two men walking anywhere on the roof. One applied load of

kN [500 lbf] over 0.1 m2 [1 ft2] applied anywhere on the roof addresses two men walking.

4) Internal floating roof design external pressure ( P  fe) of (0.24 kPa [5 lbf/ft2]) minimum.

f) Minimum Roof Live Load ( Lr ): 1.0 kPa (20 lb/ft2) on the horizontal projected area of the roof. The minimum

live load may alternatively be determined in accordance with ASCE 7, but shall not be less than 0.72 kPa (15 p

The minimum roof live load shall be reported to the Purchaser.

Diametro del tanque( D)

Tamaño minimo del anguloa 

(mm)Tamaño minimo del anguloa 

(pulg.)

 D ≤ 11 m, ( D ≤ 35 ft) 50 × 50 × 5 2 × 2 × 3/16

11 m <  D ≤ 18 m, (35 ft <  D ≤ 60 ft) 50 × 50 × 6 2 × 2 × 1/4

 D > 18 m, ( D > 60 ft) 75 × 75 × 10 3 × 3 × 3/8

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a  Approximate equivalent sizes may be used to accommodate local availability of materials.

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