sewer cleaning metal rods
1987 Edition

Overview of IS 11931: Coverage & Specifications

• Scope: This standard defines requirements for metallic rods intended for sewer cleaning, encompassing size, permissible deviations, marking, and material norms.

• Marking Requirements (Clause 6.1): Each rod and coupling must bear the manufacturer’s name as well as the trademark.

• Permissible Deviations (Clause 2.2):

  • Length: ± 10 mm
  • Diameter: +0.5 mm

• Rounding Rules (Clause 0.3): Test or analysis outcomes should be rounded following IS 2-1960, preserving the number of significant figures identical to the specified parameters.

• Material Standards: Steel ingots and billets must adhere to specifications appropriate for volute, helical, and laminated springs as used in automotive suspensions and railway vehicles.

Tolerances Summary Table for Metal Rods

Marking Visualization

graph LR
A[Rod or Coupling] --> B[Manufacturer Name]
A --> C[Trademark]

This facilitates traceability and quality monitoring as per IS 11931.

Specifications on Dimensions and Tolerances in IS 11931

Key Dimensional Limits (Clause 2.2)

• Length variation: ± 10 mm
• Diameter variation: +0.5 mm (no negative allowance)

Rounding Procedures (Clause 0.3)

• Values should be rounded according to IS 2:1960.
• Maintain the same number of significant digits as originally specified.

Marking Details (Clause 6.1)

• Markings on each rod and coupling must include:
  • Manufacturer’s name
  • Trademark

Summary Table: Dimensional Tolerances

Additional Notes:

• These tolerances ensure rods fit properly and are interchangeable during sewer cleaning.
• Positive-only diameter tolerance prevents undersized rods that could loosen or fail.
• Rounding rules from IS 2:1960 apply for test result reporting.

flowchart TD
    A[Begin Rod Production] --> B[Measure Length]
    B --> |Within ±10 mm| C[Measure Diameter]
    C --> |Within +0.5 mm| D[Apply Manufacturer Name & Trademark]
    D --> E[Perform Quality Inspection & Ship]

This strict specification guarantees dependable sewer cleaning metal rods under IS 11931.

Material Criteria According to IS 11931

1. Dimensional Tolerances (Clause 2.2)

• Length: ± 10 mm
• Diameter: +0.5 mm (no negative tolerance)

2. Rounding Off (Clause 0.3)

• Testing and analysis results must be rounded as per IS 2-1960.
• Maintain the same significant digits as those specified.

3. Marking Requirements (Clause 6.1)

• Each rod and coupling must be stamped with:
  • Manufacturer’s name
  • Trademark

Additional Material Notes:

• Steel must meet standards applicable to ingots and billets used in automotive and railway spring manufacturing.
• Coupling threads should comply with ISO metric screw thread standards defined in IS 4218 Parts 1 through 6.

Tolerance Summary Table

flowchart TD
    A[Steel Rod] --> B{Dimension Check}
    B -->|Length| C[±10 mm]
    B -->|Diameter| D[+0.5 mm]
    A --> E[Marking Process]
    E --> F[Manufacturer Name]
    E --> G[Trademark]

This ensures rods meet dimensional accuracy and traceability requirements as per IS 11931.

Construction Specifications for Sewer Cleaning Metal Rods (IS 11931)

Dimensional Limits (Clause 2.2):

• Length tolerance: ± 10 mm
• Diameter tolerance: +0.5 mm (no negative tolerance)

Additional Fabrication Requirements:

• Rods must be straight, smooth, and free from surface defects or irregularities.
• Ends of rods should be threaded or designed for coupling to enable easy connection.
• Materials must meet specified grades ensuring corrosion resistance and sufficient mechanical strength.

Typical Dimension and Tolerance Table:

Notes:

• Compliance with mechanical properties specified in IS 11931 is mandatory.
• Proper coupling design allows efficient force transfer during sewer cleaning.

flowchart LR
    A[Metal Rod] --> B{Check Length}
    B -->|Within ±10 mm| C[Accept]
    B -->|Outside tolerance| D[Reject]
    A --> E{Check Diameter}
    E -->|Within +0.5 mm| C
    E -->|Outside tolerance| D

This guarantees quality and operational efficiency in sewer cleaning applications.

Testing Requirements under IS 11931

• Result Rounding (Clause 0.3): Test results must be rounded following IS 2-1960, retaining the number of significant digits as specified.

• Marking (Clause 6.1): Rods and couplings must be marked with the manufacturer’s name and trademark.

• Tolerance Limits (Clause 2.2):

  Parameter	Allowed Tolerance
  Length	± 10 mm
  Diameter	+0.5 mm

• Bend Test (Clause 5.1):

  • Bend rods through a 90° angle around a 625 mm radius.
  • Apply a torque of 26 kg·m continuously for 5 hours.
  • Rods must remain elastic without developing cracks.

Bend Test Parameters

flowchart LR
    A[Initiate Test] --> B[Bend rod 90° at 625 mm radius]
    B --> C[Apply 26 kg·m torque for 5 hours]
    C --> D{Evaluate Rod Condition}
    D -->|No cracks and elastic| E[Pass Test]
    D -->|Cracks or failure| F[Fail Test]

This ensures rods meet durability and flexibility criteria outlined in IS 11931.

IS 11931: Marking and Identification Essentials

• Clause 6.1: Every rod and coupling should be clearly marked with:

  • The manufacturer’s name
  • The manufacturer’s trademark

• Tolerance Specifications (Clause 2.2):

  • Length: ± 10 mm
  • Diameter: +0.5 mm

• Rounding Standard (IS 2-1960): Testing results must be rounded to maintain the number of significant digits as specified.

Summary Table: Marking and Dimensional Tolerances

These measures ensure traceability and maintain quality control for rods and couplings used in sewer cleaning.

IS 11931: Quality Assurance and Use of Standard Mark

• Marking (Clause 6.1): Each rod and coupling must bear:

  • Manufacturer’s name
  • Trademark

• Rounding Off (Clause 0.3): Test or analysis data should be rounded according to IS 2-1960, preserving the significant digits as indicated.

• Dimensional Tolerances (Clause 2.2):

  • Length: ± 10 mm
  • Diameter: +0.5 mm

Tolerances Summary Table

Notes:

• Markings help maintain traceability and uphold quality standards.
• Rounding procedures ensure consistency in test result reporting.
• Tolerances facilitate dimensional precision during manufacturing.

flowchart LR
    A[Manufacturing Process] --> B[Apply Manufacturer Name & Trademark]
    B --> C[Dimensional Verification]
    C --> D{Within Tolerance?}
    D -- Yes --> E[Approve for Quality]
    D -- No --> F[Reject or Reprocess]

This process guarantees adherence to IS 11931 quality standards.