What is the maximum capacity of tanks covered by this standard?

The standard covers tanks with a capacity up to 10,000 litres (Title).

What is the primary test to check the quality of a ferrocement tank?

The Seepage Test (Clause 8.2), where the tank is filled with water for 24 hours and must show no visible signs of leakage.

What type of reinforcement is specified?

Galvanized or ungalvanized steel wire mesh (weldmesh or woven mesh) over skeletal steel reinforcement bars (Clause 4.4).

What is the minimum recommended curing period?

The tank shall be cured for a minimum period of 14 days by continuous wetting or immersion in water (Clause 5.2).

IS 13356

: 1992

Precast Ferro cement water tanks up to 10000 litres capacity

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This standard specifies the requirements for precast ferrocement water tanks of cylindrical and rectangular shape, with or without a cover, up to a capacity of 10,000 litres. It covers materials, construction details, dimensions, performance tests, and marking criteria for these tanks.

Precast Ferro cement water tanks up to 10000 litres capacity

Quick Reference Values

Maximum capacity10000 litres

Minimum cement sand ratio for mortar1:3 by volume

Maximum water-cement ratio0.45 by mass

Minimum curing period14 days

Seepage test duration24 hours

Seepage test acceptance criteriaNo visible signs of leakage on the outer surface

Practical Notes

Handle with care during transportation and installation as ferrocement is a thin-walled, brittle material susceptible to impact damage.

Proper and extended curing (minimum 14 days) is absolutely critical to ensure water-tightness and durability.

Ensure uniform placement of wire mesh and adequate mortar cover, as exposed reinforcement will lead to rapid corrosion and failure.