sewer cleaning metal rods

IS 11931: Scope & Key Specifications

• Scope: Specifies requirements for metal rods used in sewer cleaning, including dimensions, tolerances, marking, and material standards.

• Marking (Clause 6.1):
  Each rod and coupling must be marked with the manufacturer's name and trade-mark.

• Tolerances (Clause 2.2):

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

• Rounding Off (Clause 0.3):
  Final test or analysis values must be rounded per IS 2-1960, retaining the same significant figures as the specified value.

• Material Standards:
  Steel ingots and billets should comply with specifications for volute, helical, and laminated springs used in automotive suspension and railway rolling stock.

Summary Table: Tolerances for Metal Rods

Marking Requirements

graph LR
A[Rod/Coupling] --> B[Manufacturer's Name]
A --> C[Trade-mark]

This ensures traceability and quality control of sewer cleaning rods per IS 11931.

IS 11931: Dimensions and Tolerances for Sewer Cleaning Metal Rods

Key Tolerances (Clause 2.2)

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

Rounding Off (Clause None 0.3)

• Values must be rounded as per IS 2:1960 rules.
• Retain the same number of significant digits as specified values.

Marking (Clause 6.1)

• Each rod and coupling must be marked with:
  • Manufacturer's name
  • Trade-mark

Summary Table: Tolerances

Notes:

• These tolerances ensure interchangeability and proper fit during sewer cleaning operations.
• Diameter tolerance is only positive to avoid undersized rods that may fail or loosen.
• Follow IS 2:1960 for rounding off numerical results in testing or quality control.

flowchart TD
    A[Start: Rod Manufacturing] --> B[Measure Length]
    B --> |Within ±10mm| C[Measure Diameter]
    C --> |Within +0.5mm| D[Mark Rod with Manufacturer & Trade-mark]
    D --> E[Quality Check & Dispatch]

This concise specification ensures reliable and standardized sewer cleaning rods per IS 11931.

IS 11931: Material Requirements - Key Points

1. Tolerances on Metal Rods (Clause 2.2)

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

2. Rounding Off (Clause 0.3)

• Follow IS 2-1960 for rounding test or analysis results.
• Retain the same number of significant digits as specified values.

3. Marking (Clause 6.1)

• Each rod and coupling must be marked with:
  • Manufacturer's name
  • Trade-mark

Additional Notes:

• Material should comply with specifications for steel ingots/billets used in springs (automotive or railway).
• ISO metric screw thread standards apply for couplings (Parts 1 to 6 cover profiles, tolerances, and size limits).

Summary Table: Metal Rod Tolerances

flowchart TD
    A[Steel Rod] --> B{Check Dimensions}
    B -->|Length| C[±10 mm]
    B -->|Diameter| D[+0.5 mm]
    A --> E[Marking]
    E --> F[Manufacturer's Name]
    E --> G[Trade-mark]

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

IS 11931: Construction Details for Sewer Cleaning Metal Rods

Key Specifications (Clause 2.2 Tolerances):

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

Additional Construction Details:

• Metal rods must be straight, smooth, and free from defects.
• Rod ends should be threaded or coupled as per design for easy assembly.
• Material should conform to specified grades ensuring corrosion resistance and adequate strength.

Typical Dimensions & Tolerances Table:

Notes:

• Always ensure rods comply with mechanical properties specified in IS 11931.
• Proper coupling ensures efficient transmission of force during sewer cleaning.

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

This ensures quality and performance in sewer cleaning operations.

IS 11931: Testing Procedures Key Points

• Rounding Off Results (Clause 0.3):
  Test results must be rounded as per IS 2-1960, retaining the same number of significant figures as specified values.

• Marking (Clause 6.1):
  Each rod and coupling must be marked with the manufacturer's name and trademark.

• Tolerances (Clause 2.2):

  Parameter	Tolerance
  Length	± 10 mm
  Diameter	+0.5 mm

• Bend Test (Clause 5.1):

  • Bend rods 90° around a 625 mm radius.
  • Apply torque of 26 kg·m for 5 hours.
  • Rods must remain elastic, no cracks allowed.

Summary Table: Bend Test Parameters

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

This ensures compliance with IS 11931 testing requirements.

IS 11931 – Marking and Identification: Key Points

• Clause 6.1:
  Each rod and coupling must be marked with:

  • Manufacturer's name
  • Manufacturer's trade-mark

• Tolerances (Clause 2.2):

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

• Rounding Off (IS 2-1960):
  Final test values must be rounded to the same number of significant digits as specified.

Summary Table: Marking & Tolerances

This ensures traceability and quality control for rods and couplings used in springs manufacturing.

IS 11931: Quality Assurance & Standard Mark Key Points

• Marking (Clause 6.1):
  Each rod and coupling must be marked with:

  • Manufacturer's name
  • Trade-mark

• Rounding Off (Clause 0.3):
  Test or analysis results shall be rounded as per IS 2-1960.

  • Retain the same number of significant digits as the specified value.

• Tolerances (Clause 2.2):

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

Summary Table: Tolerances for Metal Rods

Notes:

• Marking ensures traceability and quality control.
• Rounding rules maintain consistency in reporting test results.
• Tolerances ensure dimensional accuracy during manufacturing.

flowchart LR
    A[Manufacturing] --> B[Marking: Name & Trade-mark]
    B --> C[Dimensional Checks]
    C --> D{Within Tolerance?}
    D -- Yes --> E[Pass Quality Assurance]
    D -- No --> F[Reject / Rework]

This ensures compliance with IS 11931 quality assurance requirements.