Recommendations for cleaning of premises and plants using asbestos fibres

IS 11767: Scope - Key Points & References

Scope (Clause 3.2):

• Does not apply to asbestos-containing products that do not release dust during normal handling (e.g., locked-in or encapsulated products).

Key Specifications:

• Safety and health definitions as per IS 11451.
• Respiratory protection during maintenance per IS 9623.
• Waste disposal as per IS 11768.

Relevant Standards Referenced (Annex A)

Summary Table: Application Scope

Maintenance & Safety

• Respiratory protective equipment must be worn during maintenance (Clause 8.8.1).
• Waste must be sealed in impermeable bags and disposed of per IS 11768.

flowchart TD
    A[Asbestos Product] --> B{Releases Dust?}
    B -- Yes --> C[IS 11767 Applicable]
    B -- No --> D[IS 11767 Not Applicable]
    C --> E[Follow IS 11451, IS 9623, IS 11768]
    D --> F[Encapsulated/Locked-in Product Handling]

For detailed formulas or tables, refer to the individual standards IS 11451, IS 9623, and IS 11768 as IS 11767 primarily sets scope and references.

IS 11767 - Definitions Summary

• The standard refers to IS 11451 for all definitions related to occupational exposure to asbestos.
• Clause 3.2 clarifies that the provisions do not apply to asbestos products that do not release dust during normal handling (e.g., locked-in or encapsulated products).
• For respiratory protection during maintenance, IS 9623 is referenced.
• Waste disposal must follow IS 11768 guidelines.
• Annex A lists related IS codes for safety, disposal, and protection.

Key References for Definitions & Safety

Important Notes:

• Always use the latest edition of referenced standards.
• Definitions are primarily in IS 11451; consult it for detailed terms like "asbestos dust," "exposure limits," etc.
• Protective equipment and waste disposal protocols are standardized and must be strictly followed.

flowchart LR
    A[IS 11767 Definitions] --> B[Refer IS 11451 for Definitions]
    A --> C[Exclusions: Non-dust releasing products]
    A --> D[Respiratory Protection per IS 9623]
    A --> E[Waste Disposal per IS 11768]

This ensures clarity on asbestos handling terminology and safety compliance.

IS 11767: General Requirements - Key Points & References

Scope:

• Applies to asbestos-containing products except those that do not release dust during normal handling (locked-in/encapsulated).

Key Provisions:

• Respiratory Protection:
  Maintenance work on asbestos products requires respiratory protective equipment as per IS 9623.

• Waste Disposal:
  All asbestos waste must be either recycled or sealed in impermeable bags and disposed of following IS 11768.

• Definitions:
  Use definitions from IS 11451 related to occupational exposure and safety.

Important Referenced Standards (Annex A)

Summary Table: Maintenance & Safety

Diagram: Compliance Flow for General Requirements

flowchart TD
    A[Asbestos Product Handling] --> B{Is product dust-releasing?}
    B -- No --> C[Exempt from provisions]
    B -- Yes --> D[Use Respiratory Protection (IS 9623)]
    D --> E[Maintenance Work]
    E --> F[Waste Collection]
    F --> G{Recycle?}
    G -- Yes --> H[Recycle Waste]
    G -- No --> I[Seal Waste in Impermeable Bags]
    I --> J[Dispose as per IS 11768]

Note: Always check for the latest editions of referenced IS codes for compliance.

IS 11767 - Cleaning of Floors, Walls, and Overhead Structures (Clause 7.2 Highlights):

• Floors (7.2.2.2):

  • Keep floors free from unnecessary materials or equipment that obstruct cleaning.
  • Ensure clear access for effective cleaning operations.

• Walls (7.2.3.1):

  • Clean walls at least annually or more frequently depending on building use or process requirements.

• Overhead Structures (7.2.4):

  • When cleaning overhead, cover equipment/machinery below with plastic sheeting to protect from falling debris or cleaning agents.

Practical Notes (Engineering Best Practices):

Summary Diagram:

flowchart TD
    A[Start Cleaning Process] --> B{Area Type}
    B -->|Floor| C[Clear floor of materials]
    B -->|Walls| D[Clean annually or more]
    B -->|Overhead| E[Cover equipment below]
    E --> F[Proceed with overhead cleaning]

Ensure compliance with Clause 7.2 for hygiene and operational safety.

IS 11767 - Cleaning of Machinery and Equipment (Clause 7.3)

• Frequency:

  • Machinery/equipment exposed to dust must be cleaned at the end of each shift (7.3.2).

• Exhaust Ventilation:

  • If machinery has exhaust equipment, the exhaust ventilation must operate during cleaning to prevent dust dispersion (7.3.3).

• Cleaning Method:

  • Use vacuum-cleaning equipment (Clause 8) to efficiently remove dust without dispersing it into the air.

Key Specifications Summary:

Practical Notes:

• Avoid dry sweeping to minimize airborne dust.
• Ensure all exposed parts are accessible for cleaning.
• Regular maintenance of vacuum and exhaust systems is critical.

flowchart TD
    A[Machinery with Dust Exposure] --> B{End of Shift?}
    B -- Yes --> C[Clean exposed parts]
    C --> D{Exhaust Ventilation?}
    D -- Yes --> E[Operate exhaust during cleaning]
    D -- No --> F[Proceed with cleaning]
    E --> G[Use vacuum cleaning equipment]
    F --> G

IS 11767: Vacuum-Cleaning Equipment Key Points

1. Type and Selection (Clause 8.7)

• Equipment must be suitable for asbestos dust.
• Portable vacuum cleaners should have HEPA filters capable of filtering particles ≥0.3 microns with 99.97% efficiency.

2. Maintenance (Clause 8.8)

• Follow manufacturer’s instructions strictly.
• Regularly clean and replace filters to maintain efficiency.
• Ensure proper functioning of all components.

3. Exhaust Ventilation (Clause 7.3.3)

• Exhaust ventilation must be operational during cleaning to prevent dust spread.

Filtration Efficiency:

Summary Diagram: Vacuum Cleaning System

flowchart LR
    A[Vacuum Cleaner] --> B[HEPA Filter (0.3 microns, 99.97% efficiency)]
    B --> C[Exhaust Ventilation (Operational during cleaning)]
    C --> D[Clean Air Release]

Ensure:

• Use of HEPA filters.
• Proper exhaust ventilation.
• Strict maintenance schedule for safety and efficiency.

IS 11767 - Clause 8.7: Type and Selection of Vacuum-Cleaning Equipment

Types of Vacuum-Cleaning Systems

• Central Vacuum-Cleaning System (8.7.1.1)

  • Central suction, filtration, and settling unit.
  • Ducts extend to various plant sections.
  • Preferred for asbestos due to filtered air release outside the workplace.

• Portable Vacuum-Cleaning System (8.7.1.2)

  • Not detailed here but typically used for localized cleaning.

Key Selection Criterion (8.7.2)

• Whether asbestos is vacuumed wet or dry determines the choice of vacuum system.

Summary Table for Selection

Important Notes:

• Central systems reduce airborne asbestos fiber exposure.
• Filtration must meet high-efficiency standards (e.g., HEPA filters).
• Wet vacuuming reduces dust but requires equipment resistant to moisture.

flowchart LR
    A[Vacuum Cleaning System] --> B[Central System]
    A --> C[Portable System]
    B --> D[Central suction + filtration]
    B --> E[Ducts to plant sections]
    C --> F[Local use]
    B --> G[Filtered air released outside]
    C --> H[Air may be released inside]

For detailed filter efficiency and airflow rates, refer to IS 11767 tables on filtration performance and airflow design.

IS 11767: Maintenance of Vacuum-Cleaning Equipment — Key Points

• Clause 8.8: Follow manufacturer’s instructions for:

  • Frequency of cleaning
  • Filter replacement
  • Other maintenance tasks

• Clause 8.2: After each use:

  • Clean all surfaces thoroughly
  • Ensure no asbestos dust/waste remains
  • Conduct periodic preventive maintenance

• Clause 7.3.3: If exhaust equipment is fitted:

  • Keep exhaust ventilation operating during cleaning

Recommended Maintenance Checklist

Notes:

• Use HEPA filters for asbestos dust.
• Maintain negative pressure in vacuum units.
• Regularly check motor and suction efficiency.

flowchart LR
    A[Start Cleaning] --> B[Operate Exhaust Ventilation]
    B --> C[Use Vacuum Equipment]
    C --> D[After Use: Clean Surfaces]
    D --> E[Inspect Filters & Replace if Needed]
    E --> F[Schedule Preventive Maintenance]
    F --> G[Ready for Next Use]

This ensures safe, efficient operation and compliance with IS 11767.

IS 11767 – Waste Disposal Key Points

• Waste Disposal Standard:
  Disposal of asbestos-containing waste must comply with IS 11768 (refer to this for detailed procedures).

• Wastewater Disposal (Clauses 7.2.2.4 & 7.2.3.2):
  Asbestos-containing wastewater from washing processes must undergo suitable treatment before disposal to prevent environmental contamination.

• Collection Capacity (Clause 8.7.3):

  • Capacity depends on the volume of waste generated.
  • Adequate capacity reduces the frequency of bag changes, improving safety and efficiency.

Important Specifications from IS 11768 (Referenced)

Summary Flow for Waste Disposal

flowchart TD
    A[Collected Waste] --> B[Packaging in Leak-tight Bags]
    B --> C[Storage (Minimize Time)]
    C --> D[Disposal as per IS 11768]
    E[Wastewater from Washing] --> F[Treatment]
    F --> G[Safe Disposal]

Note: Always refer to IS 11768 for detailed disposal procedures and environmental safeguards.

IS 11767: List of Referred Indian Standards

Key Points:

• Respiratory Protection: As per Clause 8.8.1, respiratory protective equipment must comply with IS 9623.
• Waste Disposal: Clause 9 mandates disposal of asbestos waste per IS 11768, using impermeable sealed bags.
• Health & Safety: IS 11451 and IS 12078 specify safety and personal protection norms for workers handling asbestos.

Usage:

• These referenced standards ensure safe handling, maintenance, and disposal practices related to asbestos.
• Compliance with these IS codes is mandatory for occupational safety and environmental protection.

flowchart TD
    A[Cleaning & Maintenance] --> B[Respiratory Protection (IS 9623)]
    A --> C[Waste Collection]
    C --> D[Sealed Bags Disposal (IS 11768)]
    A --> E[Worker Safety (IS 11451 & IS 12078)]

For detailed procedures and specifications, refer directly to these IS documents available from BIS.