mould assembly for determination of permeability of soils
1985 Edition

Overview of Scope in IS 11209 - Detailed Specifications

Scope:
Defines the materials, dimensions, and fabrication requirements for mould assemblies applied in soil permeability laboratory tests.

Highlights:

• Material Specifications (Clause 3.1, Table 1):

• Dimensional Tolerances (Clause 2.1):
  Dimensions follow Figures 1 to 6; tolerances adhere to IS 2102 (Part 1) - 1980 for medium class accuracy.

• Measurement Units:
  All linear dimensions are specified in millimetres (mm) with SI units applied for force, pressure, etc.

Key SI Units Reference (from IS 11209):

This section ensures uniformity in material quality and dimensional precision for mould assemblies used in soil permeability testing.

flowchart TD
    A[Scope of IS 11209] --> B[Material Requirements]
    A --> C[Dimensional Tolerances]
    B

Summary of Dimensions and Tolerances Defined in IS 11209

• Dimensions and Allowable Deviations:

  • Nominal sizes for parts are provided in Figures 1 through 6.
  • Unless stated otherwise, tolerances comply with IS 2102 (Part 1)-1980, Medium Class.
  • Numerical rounding should conform to IS 2-1960.

• Examples of Figures:

  • Fig. 3: Drainage Base (3 holes, 11 mm diameter spaced at 120°)
  • Fig. 4: Drainage Cap (3 holes, 11 mm diameter spaced at 120°)
  • Fig. 5: Metal Ring (M10 thread with fly nut)
  • Fig. 6: Tie Rod
  • Fig. 7: Extension Collar

• Tolerance Details (per IS 2102 Part 1):

  • Linear dimensions tolerance varies by nominal size (e.g., ±0.1 mm for sizes up to 10 mm, ±0.2 mm for 10–50 mm).
  • Angular tolerances generally ±1° unless otherwise specified.

• Units:

  • All dimensions in millimetres (mm).
  • Physical quantities use SI units.

Sample Tolerance Table (IS 2102 Medium Class)

Remarks:

• Refer to the respective figures for exact dimensional details.
• Materials and special finishes are specified in Table 1 of IS 11209.
• For geometric tolerances, consult IS 2102 Part 1.

flowchart LR
    A[Equipment Component] --> B{Dimension Type}
    B -->|Nominal| C[Refer Figures 1-6]
    B -->|Tolerance| D[IS 2102 Part 1 - Medium Class]
    C --> E[Dimensions in mm]
    D --> E

This section guarantees consistent sizing and manufacturing precision for mould assembly components.

Materials Prescribed in IS 11209 for Equipment Fabrication

Notes:

• IS 292 refers to leaded brass ingots and castings.
• IS 318 covers leaded tin bronze ingots and castings.
• Nickel or chromium plating on tie rods and fly nuts provides corrosion resistance.
• Drainage base and cap include three holes of 11 mm diameter spaced at 120°.

Reference for SI Units:

This ensures proper selection of materials for durability, corrosion resistance, and adherence to Indian Standards in soil permeability mould fabrication.

Construction Guidelines per IS 11209

1. Materials for Each Component (Table 1, Clause 3.1)

2. Assembly Specifications (Clause 4.1)

• The mould assembly consists of the mould, drainage base, drainage cap, metal ring, tie rod, and extension collar as illustrated in Figures 1 to 7.
• The complete assembly must be tested to be leakproof at an internal hydraulic pressure of 100 kPa.
• Drainage base and cap feature three holes each, 11 mm in diameter, spaced 120° apart.

3. Relevant SI Units

Assembly Flow Diagram

graph LR
  Mould --> DrainageBase
  DrainageBase --> DrainageCap
  DrainageCap --> MetalRing
  MetalRing --> TieRod
  TieRod --> ExtensionCollar

This section ensures correct assembly sequence and material usage for a leakproof permeability mould.

Marking Requirements per IS 11209

Clause 5.1: Mandatory Identification Marks

Each piece of equipment shall be permanently and legibly marked with:

• Manufacturer’s name or registered trademark
• Date of manufacture
• Material type

Clause 5.1.1: ISI Marking

• Usage of the ISI Certification Mark is optional but recommended.
• The ISI Mark certifies conformity to Indian Standards and adherence to quality control.

Materials Reference (Table 1, Clause 3.1)

Additional Notes:

• Hole diameters and spacing are specified in millimetres.
• Drainage base and cap have three holes of 11 mm diameter each spaced at 120°.

Marking Process Flow

graph TD
  Equipment --> Marking
  Marking --> ManufacturerName
  Marking --> ManufactureDate
  Marking --> MaterialType
  Marking --> ISIMark(Optional)
  Equipment --> MaterialSelection
  MaterialSelection --> BrassGunMetal
  MaterialSelection --> MildSteelPlated

This process ensures traceability and quality assurance for mould assemblies used in soil permeability testing.

Key Features of Permeability Cell Assembly per IS 11209

Though no explicit formulas are provided, the standard defines the mould assembly used for soil permeability tests:

• Permeability Cell Construction:

  • Cylindrical mould with six M10 tapped holes evenly distributed at 60° intervals around the circumference.
  • Designed to securely hold soil specimens during permeability testing.

• Markings:

  • Devices may carry the ISI Certification Mark indicating compliance.

Typical Dimensions and Materials:

Permeability Calculation Formula (Darcy’s Law):

[ k = \frac{Q L}{A t h} ] Where:

• (k) = permeability coefficient (m/s)
• (Q) = volume of water passed (m³)
• (L) = length of soil sample (m)
• (A) = cross-sectional area of soil (m²)
• (t) = elapsed time for flow (s)
• (h) = hydraulic head difference (m)

flowchart TD
    Reservoir[Water Reservoir] --> Cell[Permeability Cell Assembly]
    Cell --> SoilSample[Soil Sample]
    SoilSample --> Outlet[Water Outlet]
    Outlet --> Cylinder[Measuring Cylinder]

Summary: The mould assembly includes six M10 tapped holes spaced at 60°, enabling soil permeability measurement using Darcy’s law, with ISI marking indicating quality adherence.

Testing and Quality Control as per IS 11209

1. Material Compliance (Clause 3.1, Table 1)

• Brass or Gun Metal for mould, drainage base/cap, metal ring, and extension collar as per IS 292 and IS 318 series.
• Tie rod and fly nut made of mild steel with nickel or chromium plating as specified in IS 4367.

2. Equipment Marking and Certification (Clause 5.1.1)

• Optional ISI Certification Mark may be affixed, ensuring compliance with IS 11209.
• ISI certification requires rigorous inspection, testing, and ongoing quality control.

3. Units and Measurement Standards

• Force: 1 N = 1 kg·m/s²
• Pressure/Stress: 1 Pa = 1 N/m²
• Energy: 1 J = 1 N·m
• Power: 1 W = 1 J/s

4. Reporting Test Results

• Values should be rounded following the guidelines in IS 2-1960.

Materials Summary Table

This section assures uniformity and reliability in manufacturing and testing of mould assemblies.

Usage of ISI Certification Mark under IS 11209:1985

• Per Clause 5.1.1, equipment may bear the ISI Certification Mark.
• The ISI Mark signifies that the product meets Indian Standards and is subject to strict inspection and quality control by the Bureau of Indian Standards (BIS).
• Continuous surveillance by BIS ensures ongoing conformity.
• Manufacturers must obtain a license from BIS to legally use the ISI mark.
• Licensing conditions and details are governed by the Indian Standards Institution (Certification Marks) Act and associated regulations.

Key Takeaways:

• ISI Mark is a recognized symbol of quality and standard compliance.
• Licensing and periodic inspections are mandatory.
• Enhances consumer confidence in product performance and compliance.

Reference Table of Units Used in IS 11209

flowchart LR
    Manufacturer --> Application[Apply for ISI License]
    Application --> Decision{License Approved?}
    Decision -- Yes --> Marking[Use ISI Mark]
    Decision -- No --> NoMark[Cannot Use ISI Mark]
    Marking --> Inspection[ISI Surveillance & Testing]
    Inspection --> Quality[Maintained Quality Assurance]

Summary: The ISI mark assures compliance with IS 11209 through licensing and ongoing quality oversight.

IS 11209: Related Indian Standards and SI Units Reference

Key Parameters:

• All dimensions expressed in millimetres (mm).
• Equipment may optionally carry the ISI Certification Mark (Clause 127.3).
• Components like drainage base, cap, metal ring, tie rod, extension collar include defined hole patterns (3 holes, 11 mm diameter, spaced at 120°).

Related Indian Standards:

• IS 11209:1985 itself is referenced for design and testing of soil permeability mould components.
• Additional IS codes cover materials, testing methods, and installation practices relevant to geotechnical and drainage equipment (including standards on soil mechanics and construction materials).

SI Units Adopted in IS 11209:

Important Formulae:

• Force: [ F = m \times a \quad (N = kg \cdot m/s^2) ]
• Pressure (Stress): [ \sigma = \frac{F}{A} \quad (Pa = N/m^2) ]

Diagram of Hole Pattern for Drainage Base and Cap:

circleDiagram
    title Drainage Base/Cap Hole Layout
    circle
    hole1: 11 mm diameter at 0°
    hole2: 11 mm diameter at 120°
    hole3: 11 mm diameter at 240°

Use IS 11209:1985 as a reference for standardized dimensions and SI unit usage in permeability mould assemblies.