liquid limit apparatus for soils

IS 9259: Scope - Key Specifications and Materials

Scope:
IS 9259 covers grooving tools and gauge blocks used in soil testing equipment like liquid limit devices.

Key Material Specifications (Clause 4.2, Table 2)

Additional Notes:

• Rounding off results: Follow IS 2-1960 for rounding test values to the same significant figures as specified.
• Material quality: Brass parts must have a smooth finish for precision.
• Liquid Limit Device Components: Use vulcanized rubber (hardness 86-90 IRHD, resilience 30-40%) and chrome-plated brass parts as per IS 5192-1969 and IS 410-1967.

Summary Diagram: Material Flow for Grooving Tools

flowchart TD
    A[Grooving Tools] --> B[Type A: Sheet/Cast Brass]
    A --> C[Type B]
    C --> C1[Handle: Brass Rod]
    C --> C2[Tool: Cast Brass]
    A --> D[Type C]
    D --> D1[Tool: Sheet Brass]
    D --> D2[Handle: Brass Wire]
    A --> E[Gauge Block: Cast Brass]

This ensures tools meet precision, durability, and standardization for soil testing accuracy.

IS 9259: Materials Specifications Summary

Grooving Tools & Gauge Block (Clause 4.2, Table 2)

_* IS 410-1967: Rolled brass plate, sheet, strip, and foil

• IS 292-1961: Brass ingots and castings
  § IS 4413-1967: Brass wires for general engineering_

Liquid Limit Device Materials (Clause 3.1, Table 1)

_* IS 5192-1969: Vulcanized natural rubber compounds

• IS 410-1967: Rolled brass plate, sheet, strip, and foil_

Notes on Material Properties

• Brass components must have a smooth finish.
• Vulcanized rubber hardness and resilience must be tested as per IS 3400 (Part II & XI).
• All brass parts

IS 9259: Liquid Limit Device - Key Specifications

1. Liquid Limit Device Construction (Clause 3.2.1)

• Base: Carries sliding carriage assembly.
• Sliding Carriage: Holds the cup, adjustable to drop cup by 10 mm.
• Cup:
  • Hinged to sliding carriage via brass pin.
  • Smooth-finished inside surface.
  • Brass follower block brazed for suspension.
  • Dimensions as per Fig. 1 (typically ~ 58 mm diameter, 35 mm height).
• Cam and Handle:
  • Cam with smoothly curved contact face.
  • Handle fixed to cam shaft with free rotating knob.
  • Designed for right-hand operation.
• Rubber Feet: Fixed to base for stability.

2. Dimensional Tolerances

• Follow nominal dimensions in Fig. 1 to 3.
• Tolerances as per IS 2102-1969.

3. Grooving Tools and Gauge Block

• Used to create standard groove in soil pat for testing.
• Dimensions and shape standardized for repeatability.

Summary Table: Liquid Limit Device Key Dimensions (Typical)

flowchart LR
    Base --> SlidingCarriage
    SlidingCarriage --> Cup
    Cup --> BrassFollowerBlock
    SlidingCarriage --> CamShaft
    CamShaft --> Handle
    Base --> RubberFeet

Note: Refer to IS 9259 Fig. 1 for exact dimensions and IS 2102 for tolerance details.

IS 9259: Grooving Tools and Gauge Block - Key Details

1. Types & Dimensions (Clause 4.3.1 & Fig. 2)

• Grooving Tools: Three types - Type A, B, C
• Type B handle doubles as the gauge block.
• All dimensions are in millimeters (Clause 2.1).

2. Materials (Clause 4.2 & Table 2)

* Rolled brass plate/sheet specification

• Brass ingots and castings
  § Brass rods/wires for engineering

3. Summary Diagram of Tool Types

graph TD
    A[Grooving Tools] --> A1[Type A: Sheet/Cast Brass]
    A --> B1[Type B: Handle (Brass Rod), Tool (Cast Brass)]
    A --> C1[Type C: Tool (Sheet Brass), Handle (Brass Wire)]
    B1 --> G[Gauge Block = Type B Handle]

Note: Refer Fig. 2 in IS 9259 for exact tool shapes and dimensions.

IS 9259 - Marking & Specifications Summary

Marking (Clause 5.1)

The following must be clearly marked on the liquid limit device, grooving tools, and gauge block:

• Manufacturer's name or registered trademark
• Date of manufacture
• Type (where applicable)

Materials for Grooving Tools & Gauge Block (Clause 4.2, Table 2)

*Special notes:

• IS: 410-1967 = Rolled brass plate/sheet
• IS: 292-1961 = Brass ingots and castings
• IS: 4170-1967 = Brass rods
• IS: 4413-1967 = Brass wires

Dimensional Correction (Clause 1.6)

• Substitute 1.6 + 0.1 for 1 + 0.1 in Fig. 24 (Page 8).

Rounding Off (Clause 0.5)

• Final test values must be rounded per IS: 2-1960, retaining the same significant figures as the specified value.

This ensures traceability, material conformity, and dimensional accuracy in liquid limit testing devices.

IS 9259: Optional Features - Key Specifications & Tables

1. Dimensional Amendment (Clause 1.6)

• Replace dimension factor:
  From: 1 + 0.1
  To: 1.6 + 0.1

2. Materials for Liquid Limit Device (Clause 3.1, Table 1)

• Hardness & Resilience Tests: IS 3400 (Part II & XI)

3. Materials for Grooving Tools & Gauge Block (Clause 4.2, Table 2)

Notes:

• All brass parts must be chrome-plated.
• Dimensions are in millimeters (Clause 2.1).
• Refer to Fig. 2 for grooving tool shapes.

IS 9259: Tolerances and Dimensions Summary

• Units: All dimensions are in millimetres (Clause 2.1).

• Dimension & Tolerance Reference:
  Dimensions of liquid limit apparatus parts are per Figures 1 to 3.
  Where tolerances aren't specified, apply tolerances from IS 2102-1969.

• Key Dimension Correction:
  Clause 1.6: Replace dimension '1 + 0.1' with '1.6 + 0.1' (Fig. 24).

• Materials for Grooving Tools & Gauge Block (Table 2):

• Tolerance Application:
  Use IS 2102-1969 for general tolerance values on nominal dimensions.

Example: Tolerance Reference from IS 2102-1969 (typical)

flowchart TD
    A[Grooving Tools & Gauge Block] --> B[Materials per Table 2]
    B --> C[Type A: Sheet/Cast Brass]
    B --> D[Type B: Brass Rod & Cast Brass]
    B --> E[Type C: Sheet Brass & Brass Wire]
    B --> F[Gauge Block: Cast Brass]

IS 9259 - Special Requirements Summary

1. Materials for Liquid Limit Device (Clause 3.1, Table 1)

• Hardness and resilience tested per IS 3400 (Parts II & XI).

2. Materials for Grooving Tools & Gauge Block (Clause 4.2, Table 2)

3. Rounding Off (Clause 0.5)

• Final test values shall be rounded off as per IS 2-1960.
• Maintain the same significant figures as specified.

Notes:

• Chrome plating is mandatory for all brass parts to prevent corrosion.
• Hardness measured by IRHD scale (International Rubber Hardness Degree

IS 9259: Certification and Quality Control - Key Points

1. Certification (Clause 5.1.1)

• Apparatus may carry the ISI Certification Mark.
• ISI Mark assures compliance with the standard under a strict system of inspection, testing, and quality control.
• Continuous surveillance by ISI ensures conformity.
• Licensing for ISI Mark use is governed by Indian Standards Institution rules.

2. Materials Quality Control (Clause 3.1 & 4.2)

• Materials for components must conform to specific IS standards as per Tables 1 & 2.
• Example from Table 1:

• Grooving tools and gauge block materials per Table 2 must also conform to IS standards (e.g., IS:410, IS:292).

3. Testing and Rounding Off (Clause 0.5)

• Test results must be rounded off according to IS:2-1960.
• Number of significant digits retained should match the specified value.

Summary Table of Key IS Standards for Materials

flowchart TD
    A[Material Procurement] --> B[Inspection & Testing]
    B --> C{Conforms to IS Standards?}