What is the primary material specified for the barrels?

The standard specifies the use of suitable seasoned hardwood timber, with white oak being a commonly used and accepted type.

How is the leak-proofness of a barrel checked?

The standard specifies a leakage test, which typically involves filling the barrel with water under a slight pressure and observing for any signs of seepage over a 24-hour period.

What are the requirements for the metal hoops?

The standard specifies using mild steel hoops of a certain minimum width and thickness to ensure the staves are held together securely under internal pressure.

What is the specified moisture content for the wood?

The wood used for staves and heads should not have a moisture content exceeding 12 percent, as per Clause 4.1.2.

IS 11131

: 1984

wooden casks and barrels

CurrentSpecializedSpecificationMaterials Science · Timber and Timber Stores

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This standard lays down the requirements for materials, dimensions, capacity, construction, and testing of wooden casks and barrels, primarily used for storing and maturing alcoholic beverages. It covers the quality of timber, fabrication of components like staves and heads, assembly with steel hoops, and performance tests for leakage.

wooden casks and barrels

Quick Reference Values

Nominal capacity200 litres

Maximum permissible moisture content for staves and heads12 %

Minimum thickness of staves (finished)25 mm

Minimum number of steel hoops for a 200L barrel6

Practical Notes

The selection of timber species is crucial; traditionally white oak is used for its strength, durability, and flavour-imparting characteristics for beverages.

Proper seasoning of the timber to the specified moisture content is essential to prevent shrinkage, distortion, and subsequent leakage during service.

The process of 'charring' the inside of the barrel, a common practice for aging spirits, is a manufacturing detail often done in conjunction with the requirements of this standard.