IS 3370 Part 1

: 1965

Concrete Structures for Storage of Liquids - General Requirements

CurrentSpecializedCode of PracticeStructural Engineering · Tanks, Silos and Storage Structures
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This code lays down the general requirements for the materials, design, and construction of plain, reinforced, and prestressed concrete structures intended for the storage of liquids, primarily focusing on watertightness and durability.

Lays down general requirements for the design and construction of concrete structures for storage of liquids.

Quick Reference Values
Minimum grade of concrete for reinforced structuresM 20
Minimum nominal cover to reinforcement25 mm or diameter of bar, whichever is greater
Maximum concrete tensile stress in bending (M20)17 kg/cm2 (1.7 N/mm2) for crack resistance
Practical Notes
The 1965 edition relies exclusively on the Working Stress Method, designing sections so that concrete on the liquid-retaining face does not crack.
For modern design, this code has been superseded by the 2009 version, which shifted the minimum concrete grade from M20 to M30 and introduced Limit State design for crack width control.
Correct selection and detailing of joints (expansion, contraction, sliding) with appropriate waterstops are often more critical for watertightness than structural thickness.