8/10/2019 Thickness Limit Awwa

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WELDED CARBON STEEL TANKS FOR WATER STORAGE 9

2.2.3.1.4 ASTM A573, grade 58 plates are limited to 11/2 in. (38 mm) in

thickness.

2.2.3.1.5 Where details are such that tension may occur through the plate

thickness, consideration shall be given to the possibility that lamellar tearing may occur.

2.2.3.1.6 ASTM A36 or A283, grade C steels may be used for base plates

regardless of thickness or temperature. A36 steel ordered as a bearing plate in

accordance with ASTM A36, Sec. 5.2, is not acceptable.

Table 1 Thickness limitations and special requirements

Shell Plates:

Plate Thickness (in.)

t1/2 1/2< t1 1 < t11/2 11/2< t2 t> 2

A36 (tension governs) K, FGP

A36 (compression governs) K K, FGP, N, UT

A573, Gr 58

A131, Gr A

A131, Gr B

A283, Gr B, C (tension governs)

A283, Gr B, C (compression governs)

A283, Gr D t3/4

Substitute material from Sec. 14 notlisted above

(tension governs)

(compression governs)

Base Plates:

A36/A283 Gr C

Material may be used without special requirements

K = killed

FGP = fine-grain practice

N = normalized

UT = ultrasonic test