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Introduction
Surface preparation ensures the longevity of materials. It protects equipment against harsh ambient conditions, especially in special environments.
Some workplaces require unconditional compliance with regulations. One example of such workplaces is ATEX zones. ATEX zones have explosives present, making them one of the most dangerous workplaces. Thus, surface preparation in ATEX zones requires additional measures.
This article explores surface preparation in ATEX zones.
Understanding ATEX Zones
ATEX is a derivative of the French term, “ATmosphères EXplosibles”. The name refers to two European Union directives for controlling explosive atmospheres. There are various subcategories of ATEX zones.
ATEX 95 (94/9/EC): Protective systems intended for use in explosive atmospheres.
ATEX 137 (99/92/EC): Workplace safety requirements in explosive atmospheres.
Zone 0: Explosive atmosphere is present or for long periods.
Zone 1: An explosive atmosphere is likely to occur during normal operation.
Zone 2: An explosive atmosphere is not likely to occur in normal operation.
Importance of Surface Preparation in ATEX Zones
Proper surface preparation in ATEX zones is essential for several reasons.
Safety: Ensures the elimination of contaminants that can ignite and cause explosions.
Adhesion: Enhances the bonding of coatings to the substrate.
Durability: Prolong the life of protective coatings, reducing the need for frequent maintenance.
SSPC Standards
The Society for Protective Coatings (SSPC) sets recognized standards for surface preparation. These standards classify various parameters. Key SSPC standards relevant to ATEX zones include:
SSPC-SP1 – Solvent Cleaning: Removal of soluble contaminants using solvents. Used as a measure in ATEX zones to mitigate contaminants reacting with explosives
SSPC-SP2 – Hand Tool Cleaning: Removal of loose rust, and old paint with hand tools. Suitable when power tools or abrasive blasting are not allowed for use.
SSPC-SP3 – Power Tool Cleaning: Removal of loose contaminants using power tools. Effective in ATEX zones with appropriate safety measures to prevent ignition.
SSPC-SP5 – White Metal Blast Cleaning: Removal of all visible contaminants. Produces a white metal finish. Used in critical ATEX zones where the highest level of cleanliness is a must.
SSPC-SP10 – Near-White Blast Cleaning: Removal of almost all visible contaminants. Only slight staining is permitted. Common in ATEX zones where a white metal finish is not required.
Surface Preparation Methods for ATEX Zones
The goal of surface preparation in ATEX zones is to prevent explosions. Choosing the correct method is crucial in ensuring the intended results. There are various methods available for use.
Non-Sparking Tools
Usage: Tools made from non-ferrous materials (e.g., brass, bronze) to avoid sparking.
Application: Hand and power tool cleaning in ATEX zones to prevent ignition risks.
Wet Abrasive Blasting
Usage: Combines water with abrasive media to suppress dust and reduce ignition risk.
Application: Suitable for ATEX zones where dry blasting could create explosive dust clouds.
Vacuum Blasting
Usage: Encloses the blasting area to contain dust and debris, connected to a vacuum system.
Application: Ideal for ATEX zones to minimize dust and prevent ignition.
Chemical Cleaning
Usage: Uses chemical agents to remove contaminants without generating sparks or dust.
Application: Effective for initial cleaning in ATEX zones to remove oils and grease.
Conclusion
Surface preparation is a key process in various industries. It ensures the longevity of materials working under harsh conditions. Besides, it can be a tool to improve workplace safety in hazardous environments. That’s why surface preparation in ATEX zones is crucial.
To achieve the intended results, experts must understand the concept of surface preparation. Choosing the correct method is crucial to comply with regulatory standards and ensure safety.
