Method of test for determination of openness or fiberization of chrysotile asbestos fibre by air permeability method using rapid surface area apparatus

IS 11276 - Scope & Key Specifications for Permeability Cell Apparatus

Scope Summary:

IS 11276 covers the apparatus and method for determining surface area using permeability cells with calibrated capillary tubes.

Key Specifications:

Permeability Cell Dimensions:

• Effective Length: 58.903 ± 0.050 mm
• Diameter: 38.964 ± 0.050 mm

Periodic verification of these dimensions is recommended.

Accessories Required:

• Clean air source (~14 kPa)
• Calibrating standards (as above)
• Handle for capillary tube holders
• Tamping rod
• Filling funnel

Important Note on Rounding:

Results must be rounded per IS 2-1960, maintaining significant figures consistent with the standard's specified values.

Schematic Overview (Key Components):

graph LR
A[Clean Compressed Air] --> B[Control Valve]
B --> C[Water Reservoir]
C --> D[Bubbler Tube]
D --> E[Capillary Resistance]
E --> F[Manometer Leg]
F --> G[Manometer Scale (Exponential)]
G --> H[Permeability Cell]
H --> J[Test Specimen]
J --> K[Air Outlet]

This schematic represents the airflow path and measurement setup for surface area testing.

This concise summary covers the scope, apparatus specs, and key accessories from IS 11276 for rapid surface area testing.

IS 11276: Key Specifications for Calibrating Standards (Clause 4.3)

Additional Notes (Clause 4.2 & IS:2-1960)

• Accessories required include:
  • Clean air source (~14 kPa)
  • Calibrating standards as above
  • Handle for tube insertion/extraction
  • Tamping rod
  • Filling funnel
• Rounding off results must follow IS:2-1960, maintaining significant figures consistent with specified values.

This ensures accurate calibration of permeability cells by matching specimen cavity with precisely dimensioned capillary tubes.

IS 11276: Preparation of Test Sample – Key Points

1. Sample Dimensions (Clause 58.903)

• Specimen cell (brass):
  • Length: 58.903 ± 0.050 mm
  • Diameter: 38.964 ± 0.050 mm
• Periodic dimension checks are recommended.

2. Sampling Method (Clause 2.1)

• Follow IS 4844-1968 for asbestos fibre sampling and preparation.

3. Apparatus & Accessories (Clauses 4.2 & 4.3)

• Clean compressed air supply: ~14 kPa pressure
• Calibrating standards:

• Other accessories: tamping rod, filling funnel, handle for capillary tubes.

4. Setup Components (Fig. 1)

• Key parts include: air supply (A), control valve (B), water reservoir (C), manometer (F,G), permeability cell (H), test specimen (J), dust filter (M), and air dryer (P).

flowchart LR
    A[Clean Compressed Air] --> B[Control Valve]
    B --> C[Water Reservoir]
    C --> D[Bubbler Tube]
    D --> E[Capillary Resistance]
    E --> H[Permeability Cell]
    H --> J[Test Specimen]
    H --> F[Manometer Leg]
    F --> G[Manometer Scale]
    J --> K[Air Outlet]
    A -.-> L[Shut-off Valve]
    A -.-> P[Air Dryer]

Summary: Prepare samples in a brass cell of precise dimensions, use calibrated capillary tubes for standardization, and ensure clean, controlled airflow per IS 11276 and IS 4844-1968.

IS 11276: Apparatus Specifications for Rapid Surface Area Tester

1. Calibrating Standards (Clause 4.3)

2. Sample Cell Dimensions (Clause 58.903)

• Effective length: 58.903 ± 0.050 mm
• Diameter: 38.964 ± 0.050 mm
• Material: Brass
• Note: Periodic dimensional checks recommended.

3. Accessories (Clause 4.2)

• Clean air source (~14 kPa)
• Calibrating standards (above)
• Handle for capillary tube insertion/extraction
• Tamping rod
• Filling funnel

4. Apparatus Components (FIG.1 schematic)

• A: Clean compressed air supply (not supplied)
• B: Control valve
• C: Water reservoir
• D: Bubbler tube
• E: Capillary resistance
• F: Manometer leg
• G: Exponential manometer scale
• H: Permeability cell
• J: Test specimen
• K: Air outlet
• L: Shut-off valve (not supplied)
• M: Dust filter (fiberglass)
• N: Capillary snubber
• O: Zero mark on manometer
• P: Air dryer/desiccator (not supplied)

Summary

• Use calibrating standards with specified bore and length to fill specimen cavity.
• Ensure sample cell dimensions meet tolerance for accurate permeability measurement.
• Maintain accessories and apparatus components as per clauses for reliable testing.

flowchart LR
    A[Clean Air Supply] --> B[Control Valve] --> E[Capillary Resistance] --> H[Permeability Cell]
    H --> K[Air Outlet]
    C[Water Reservoir] --> D[Bubbler Tube] --> F[Manometer Leg] --> G[Manometer Scale]
    J[Test Specimen

IS 11276: Preparation of Apparatus - Key Specifications & Tables

1. Calibrating Standards (Clause 4.3)

2. Accessories Required (Clause 4.2)

• Source of clean air at ~14 kPa
• Calibrating standards (as above)
• Handle for inserting/extracting capillary tube holders
• Tamping rod
• Filling funnel

3. Cleaning Procedure for Capillary Tubes (Clause 34.5)

• Use dry, compressed air free from contaminants
• Pressure:
  • 138 kPa if permanently mounted
  • 34.5 kPa if temporarily mounted
• Duration: 60 seconds airflow before calibration

Summary Diagram: Apparatus Preparation Workflow

flowchart TD
    A[Start] --> B[Assemble Accessories]
    B --> C[Insert Calibrating Standard]
    C --> D[Clean Capillary Tube with Compressed Air]
    D --> E[Calibrate Apparatus]
    E --> F[Ready for Testing]

This ensures accurate permeability measurement per IS 11276 requirements.

IS 11276: Test Procedure Key Points

1. Apparatus (Clause 4.3 & 4.2)

• Calibrating Standards:

• Sample Cell Dimensions (Clause 58.903):

  • Length: 58.903 ± 0.050 mm
  • Diameter: 38.964 ± 0.050 mm

• Accessories (Clause 4.2):

  • Clean air supply (~14 kPa)
  • Calibrating standards
  • Capillary tube holder handle
  • Tamping rod
  • Filling funnel

2. Test Setup (Fig. 1 Schematic Elements)

• Air supply → Control valve → Water reservoir → Bubbler tube → Capillary resistance → Manometer → Permeability cell with specimen → Air outlet
• Key parts: Manometer scale (exponential), dust filter, air dryer (not supplied)

3. Test Procedure Summary (Clauses 7.1 to 7.7)

• Insert specimen in permeability cell
• Measure pressure drop across specimen using manometer
• Use calibrating standards to verify apparatus accuracy
• Repeat test for second specimen for reliability

4. Reporting (Clause 8)

• Report surface area values based on manometer readings and calibration

flowchart LR
    A[Clean Air Supply] --> B[Control Valve]
    B --> C[Water Reservoir]
    C --> D[Bubbler Tube]
    D --> E[Capillary Resistance]
    E --> F[Manometer (Exponential Scale)]
    F --> G[Permeability Cell with Specimen]
    G --> H[Air Outlet]

This setup ensures accurate surface area measurement via permeability and pressure drop, calibrated with glass capillary tubes of known dimensions.

IS 11276: Measurement and Recording Key Points

Calibrating Standards (Clause 4.3)

• Specimen Cell Dimensions (Clause 58.903):

  • Length: 58.903 ± 0.050 mm
  • Diameter: 38.964 ± 0.050 mm

• Rounding Off Results (Clause None: 0.5):

  • Follow IS:2-1960 for rounding.
  • Retain significant figures equal to specified values.

Apparatus Components (Fig. 1)

• Key parts include: compressed air supply, control valve, water reservoir, bubbler tube, capillary resistance, manometer, permeability cell, test specimen, dust filter, air dryer.
• Items A (air supply), L (shut-off valve), P (air dryer) are not supplied with apparatus.

Important Notes

• Calibrating standards must be stored airtight or in desiccators.
• Periodic dimension checks of specimen cell recommended for accuracy.

flowchart LR
    A[Clean Compressed Air] --> B[Control Valve]
    B --> C[Water Reservoir]
    C --> D[Bubbler Tube]
    D --> E[Capillary Resistance]
    E --> F[Manometer Leg]
    F --> G[Manometer Scale]
    G --> H[Permeability Cell]
    H --> J[Test Specimen]
    J --> K[Air Outlet]
    subgraph Additional Components
        L[Shut-off Valve]
        M[Dust Filter]
        N[Capillary Snubber]
        P[Air Dryer]
    end

This summarizes key measurement and recording specs per IS 11276 for rapid surface area testing.

IS 11276 — Reporting of Results: Key Points

Reporting Guidelines (Clause 8)

• Final test values must be rounded off as per IS 2-1960.
• Retain the same number of significant digits as the specified value in the standard.
• This ensures consistency and comparability of reported results.

Calibration Standards (Clause 4.3)

Specimen Cell Dimensions (Clause 58.903)

• Length: 58.903 ± 0.050 mm
• Diameter: 38.964 ± 0.050 mm
• Periodic dimensional checks recommended.

Schematic Overview of Rapid Surface Area Tester

flowchart LR
    A[Clean Compressed Air] --> B[Control Valve]
    B --> C[Water Reservoir]
    C --> D[Bubbler Tube]
    D --> E[Capillary Resistance]
    E --> F[Manometer Leg]
    F --> G[Manometer Scale (Exponential)]
    E --> H[Permeability Cell]
    H --> J[Test Specimen]
    J --> K[Air Outlet]
    B --> L[Shut-off Valve]
    A --> M[Dust Filter (Fibreglass)]
    A --> N[Capillary Snubber]
    A --> P[Air Dryer/Desiccator]

Summary:
Report results with correct rounding per IS 2-1960, use calibrated standards with specified bore and length, and verify specimen cell dimensions regularly for accurate surface area testing.

IS 11276: Precision and Limitations - Key Details

Calibrating Standards (Clause 4.3)

• Specimen Cell Dimensions:
  • Length: 58.903 ± 0.050 mm
  • Diameter: 38.964 ± 0.050 mm
  • Made of brass; periodic dimension checks recommended.

Rounding Off (Clause None 0.5)

• Results must be rounded per IS 2-1960.
• Number of significant figures in results = Number in the specified standard value.

Storage & Handling

• Calibrating standards must be stored in airtight containers or desiccators to maintain accuracy.

Schematic Components (Fig.1)

• Key apparatus parts include:
  • Compressed air supply (A)
  • Control valve (B)
  • Water reservoir (C)
  • Bubbler tube (D)
  • Capillary resistance (E)
  • Manometer (F, G)
  • Permeability cell (H) with specimen (J)
  • Air outlet (K), shut-off valve (L), dust filter (M), capillary snubber (N), zero mark (O), air dryer (P).

flowchart LR
    A[Compressed Air] --> B[Control Valve]
    B --> C[Water Reservoir]
    C --> D[Bubbler Tube]
    D --> E[Capillary Resistance]
    E --> F[Manometer Leg]
    F --> G[Manometer Scale]
    G --> H[Permeability Cell]
    H --> J[Test Specimen]
    J --> K[Air Outlet]
    B --> L[Shut-off Valve]
    K --> M[Dust Filter]
    M --> N[Capillary Snubber]
    A --> P[Air Dryer]

This ensures precise surface area measurement by controlling

IS 11276: Safety Precautions & Key Specifications Summary

While IS 11276 does not explicitly detail "Safety Precautions" as a separate clause, it emphasizes precision and proper calibration to ensure safe and accurate permeability testing.

Key Specifications for Calibration (Clause 4.3)

Accessories (Clause 4.2)

• Source of clean air at ~14 kPa pressure
• Calibrating standards (low & high)
• Handle for inserting/extracting capillary tube holders
• Tamping rod
• Filling funnel

Rounding Off Results (General Clause)

• Final test or calculation results must be rounded per IS 2-1960.
• Retain the same number of significant figures as specified in the standard.

Safety Notes (Based on Engineering Practice)

• Use clean air source at specified pressure to avoid contamination.
• Handle glass capillary tubes carefully to prevent breakage.
• Ensure accessories are clean and calibrated to avoid erroneous results.
• Follow proper personal protective equipment (PPE) protocols when handling glass and pressurized air.

flowchart LR
    A[Start Test] --> B[Calibrate Standards]
    B --> C[Prepare Accessories]
    C --> D[Insert Capillary Tube]
    D --> E[Apply Clean Air @ 14 kPa]
    E --> F[Measure Permeability]
    F --> G[Round Off Results (IS 2-1960)]
    G --> H[Complete Test]

Summary: Adhere strictly to calibration specs and clean air pressure, use proper accessories, and round results per IS 2-1960 for safe, reliable permeability testing.