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IS 2683:1980 is the Indian Standard (BIS) for guide for installation of impregnation plants for timber. This standard provides comprehensive guidelines for the site selection, layout, and installation of pressure impregnation plants used for the chemical preservation of timber. It details the mechanical requirements for essential plant equipment like treating cylinders, pressure vessels, and pumps, along with critical safety and operational protocols.
Guide for installation of impregnation plants for timber
A broad code of practice for wood preservation; includes sections on plant requirements and safe operation.
Key Differences
≠The IS code is from 1980 and lacks requirements for modern automation, electronic data logging, and process control systems, which are common in plants designed to recent international standards.
≠International standards like AS/NZS 2843.1 have highly specific and stringent requirements for environmental protection, such as mandatory secondary containment (bunding) for tanks and treatment areas, which are not detailed in IS 2683.
≠Modern standards place a much stronger emphasis on occupational health and safety, specifying features like interlocking doors on pressure cylinders and automated chemical handling, which are only mentioned in general terms in the IS guide.
≠IS 2683 provides prescriptive guidance (e.g., sample layouts), whereas modern standards are more performance-based, specifying the outcomes and safety levels to be achieved, allowing for more flexibility in plant design and innovation.
Key Similarities
≈All standards recognize the same fundamental components for a vacuum-pressure plant: a treatment cylinder (autoclave), solution storage and mixing tanks, vacuum and pressure pumps, and associated pipework.
≈The basic operational sequence that the plant equipment must support (e.g., initial vacuum, cylinder flooding, pressure application, final vacuum) is a common principle across all standards for full-cell treatment processes.
≈All standards mandate the use of essential safety devices, most notably a pressure relief valve on the treatment cylinder to prevent over-pressurization.
≈The requirement for basic instrumentation to monitor the process, such as pressure gauges, vacuum gauges, and thermometers, is a common feature in both the IS code and its international counterparts.
Parameter Comparison
Parameter
IS Value
International
Source
Treatment Cylinder Working Pressure
1.4 N/mm² (approx. 1400 kPa or 203 psi)
Typically 1400 kPa (approx. 200 psi), but must be suitable for the specified process.
AS/NZS 2843.1:2006
Required Vacuum Level (Minimum)
560 mm of Mercury (approx. -75 kPa)
22 inches of Mercury (approx. 559 mm Hg or -74 kPa)
AWPA M3-23
Storage Tank Capacity Guideline
At least 1.25 times the volume of the treatment cylinder.
Sufficient to fill the cylinder and treat the largest anticipated charge without interruption.
AS/NZS 2843.1:2006
Safety Valve Setting
Set at 5% to 10% above the working pressure.
Must be set not to exceed the Maximum Allowable Working Pressure (MAWP) of the vessel as per the relevant pressure vessel code (e.g., AS 1210).
AS/NZS 2843.1:2006
Environmental Spill Containment (Bunding)
Not explicitly specified or quantified.
Mandatory. Must contain at least 110% of the volume of the largest tank within the bunded area.
AS/NZS 2843.1:2006
Pressure Gauge Calibration
No specific frequency mentioned; gauges must be 'reliable'.
Must be checked at least weekly against a master gauge and calibrated by a certified authority at least every 6 months.
AWPA M3-23
⚠ Verify details from original standards before use
Key Values2
Quick Reference Values
Typical cylinder working pressure1.05 to 1.40 N/mm2 (10.5 to 14 kgf/cm2)
It covers guidelines for the installation, layout, and equipment specifications of pressure treatment (impregnation) plants used for preserving timber.
Are the actual chemical treatment processes and schedules specified in this code?+
No, the actual chemical preservation practices, types of preservatives, and treatment schedules are covered separately in IS 401.
What safety fittings are mandatory for the treating cylinder?+
The cylinder must be equipped with safety relief valves, calibrated pressure gauges, and vacuum gauges to safely monitor the impregnation cycle.