The 2004 edition of IS 2372 outlines the specific timber species, classification, defect allowances, sizing details, and required preservative treatments for timber utilized in cooling tower structures. It is designed to guide engineers, architects, and construction experts in choosing and applying timber that ensures durability and structural performance under the operating conditions of cooling towers.
Overview
The 2004 edition of IS 2372 outlines the specific timber species, classification, defect allowances, sizing details, and required preservative treatments for timber utilized in cooling tower structures. It is designed to guide engineers, architects, and construction experts in choosing and applying timber that ensures durability and structural performance under the operating conditions of cooling towers.
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Structure
Frequently Asked
Clause 4 of IS 2372 specifies timber species suited for cooling towers, detailed in Table 1. Commonly recommended species include Teak (Tectona grandis), Deodar (Cedrus deodara), Chir Pine (Pinus roxburghii), and other durable hardwoods known for resistance to decay and moisture. Selection is based on durability, strength, and local availability to ensure performance under wet and mechanical stresses.
Timber for cooling towers is categorized into Select Grade, Grade I, and Grade II per Clause 5.1 and 5.3 of IS 2372, with each grade having defined maximum allowances for defects such as grain slope, knots, checks, and end splits. For instance, Select Grade timber tolerates a grain slope up to 1 in 18 and knot sizes limited to 1/5th of the face width with fewer knots per length, while Grade II allows more lenient limits. Certain defects like loose grain and shakes are prohibited across all grades.
As outlined in Clause 7.1 and Table 4, all sapwood must receive 100% preservative penetration. Heartwood penetration varies by species, ranging from 5 mm to 20 mm, with some requiring surface incisions of about 15 mm to facilitate absorption. Preservative retention levels for structural timber include 12 kg/m³ for CCA or ACC, 16 kg/m³ for CCB, and 128 kg/m³ for creosote/fuel oil mixtures, ensuring long-term durability against biological degradation.
Clause 6.2 specifies that length tolerances for timber members are ±5 mm, while width and thickness dimensions allow no negative deviation and a maximum positive tolerance of +2 mm. These precise dimensional controls help maintain proper fit and structural integrity in cooling tower assemblies.
The standard sets stringent limits on defects based on grade. Knot diameters must not exceed 1/5th or 1/6th of the face width depending on size and grade, with frequency restrictions varying from one knot per 1.5 m for Select Grade to two knots per meter for Grade II. Permissible check depths are capped at 3 mm for Select Grade and 5 mm for Grades I and II. End splits are limited to 150 mm in length and affect no more than 25% to 33% of the member length depending on grade, ensuring structural reliability.
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