perforated concrete pipes

IS 7319 - Scope: Key Specifications & Tables

Scope: Covers perforated concrete pipes for underdrainage with defined dimensions, physical properties, and sampling/testing criteria.

1. Sampling & Conformity (Clause 7.2.2, Table 7.1)

2. Dimensions & Physical Requirements (Clause 4.2, Table 1)

IS 7319 Key References, Tables & Specifications Summary

1. Sampling & Conformity (Clause 7.2.2, Table 2)

2. Dimensions & Physical Requirements (Clause 4.2, Table 1)

IS 7319 - Key Specifications for Materials (Clause 4.2 and related)

1. Permissible Dimensional Variations (Clause 4.2)

• Variations from Table 1 dimensions must not exceed limits in 4.2.1.
• Heavier wall thickness pipes can be supplied optionally by the manufacturer.

2. Table 1: Sizes and Dimensions of Perforated Concrete Pipes

• Note: If barrel thickness increases, socket inside diameter increases by twice the thickness increase.

3. Material Specifications Referenced

• Ordinary, Rapid-hardening, Low heat Portland Cement (IS 269)
• Portland Blast Furnace Slag Cement (IS 455)
• Portland Pozzolana Cement (IS 1489)
• Coarse and Fine Aggregates (IS 383)
• Plain and Reinforced Concrete Code (IS 456)
• Test Methods for Concrete Strength (IS 516)

4. Sampling and Testing (Clause 7.2.2)

| Lot Size | Sample Size (for Clauses 4 & 5) | Permissible Failures | Sample Size (for Tests under 6.2) | |----------------|---------------------------------|---------------------|

IS 7319: Dimensions and Tolerances for Perforated Concrete Pipes

Key Specifications (Clause 4.2 & Table 1)

Tolerances (Clause 4.2.1)

• Overall length: ±1% of standard length
• Internal diameter (≤300 mm): +3 mm

Notes

• If barrel thickness increases, socket inside diameter increases by twice the increase.
• Socket thickness (Ts) measured 6 mm from outer end.

Summary formula for socket diameter adjustment:

[ D_{socket,new} = D_{socket,standard} + 2 \times \Delta T_{barrel} ]

flowchart LR
    A[Standard Barrel Thickness] --> B[Increase Barrel Thickness]
    B --> C[Increase Socket Diameter by 2 × ΔT]
    C --> D[Maintain Proper Fit

IS 7319: Manufacture - Key Specifications & Tables

1. Agreement (Clause 5.3.1)

• Manufacturer and purchaser must mutually agree on specific requirements beyond the standard.

2. Rounding Off (Clause 0.4)

• Test/analysis results must be rounded per IS 2-1960.
• Retain significant places equal to the specified value.

3. Sampling (Clause 7.2.2, Table 7.1)

4. Dimensional & Physical Requirements (Clause 4.2, Table 4.1)

IS 7319: Key Formulas, Tables & Specifications for Tests

1. Number of Tests (Clause 7.2 & 7.2.2)

• The sample size and permissible number of failures depend on the lot size.
• Sampling follows Table 7.1 (Clause 7.2.2):

• Pipes for tests under 6.2 are selected from those that satisfy initial requirements (Clause 7.2.1).

2. Rounding Off Results (Clause 5.3.1 & 0.4)

• Test results must be rounded according to IS 2:1960.
• Retain the same number of significant places as specified values.

Summary:

• Use Table 7.1 for sample size and acceptance criteria.
• Test pipes under 6.2 from conforming samples.
• Round off results per IS 2:1960 for consistency.

flowchart TD
    A[Lot Size] --> B[Determine Sample Size]
    B --> C{Test Type}
    C -->|Req. under 4 & 5| D[Sample Size & Permissible No.]
    C -->|Tests under 6.2| E[Sample Size from Table 7.1]
    D & E --> F[Select Pipes for Testing]
    F --> G[Conduct Tests]
    G --> H[Round Results (IS 2:1960)]
    H --> I[Decide Conformity]

This

IS 7319: Criteria for Conformity (Clause 7.3)

A lot is conforming if conditions in Clauses 7.3.2, 7.3.3, and 7.3.3.1 are met; else, it is non-conforming.

Key Table: Sample Size & Criterion for Conformity (Clause 7.2.2, Table 7.1)

Interpretation:

• Sample Size: Number of samples to be tested from the lot.
• Permissible Number: Maximum allowable defective samples for the lot to be accepted.
• Tests under clause 6.2 require additional sample sizes as indicated.

Additional Specification (Clause 5.4.2):

• Curves must be at 90°, 45°, 22.5°.
• Curvature should substantially conform to specified radii.

Summary:
Use Table 7.1 to determine sample size and permissible defects for lot acceptance. Verify curvature angles as per Clause 5.4.2 for geometric conformity.

IS 7319 - Marking Specifications Summary

Key Marking Requirements (Clause 8.1)

Each pipe must be clearly marked with:

• Class of pipe
• Date of manufacture
• Manufacturer's name or trade-mark
• Plant identification

Markings should be indented or applied with waterproof paint for durability.

Rejected Specimens (Clause 7.4)

• Rejected pipes must be plainly marked by the inspector.
• Manufacturer/seller must replace rejected pipes at no extra cost.

Sampling & Testing (Clause 7.2.2, Table 7.1)

Additional Notes

• Rounding of test results should follow IS 2:1960.
• Purchaser and supplier agreement is needed for certain clauses (5.3.1).

flowchart TD
    A[Pipe Manufactured] --> B{Marking}
    B -->|Class, Date, Manufacturer, Plant| C[Mark Pipe]
    B -->|Rejected Specimen| D[Mark as Rejected]
    D --> E[Replace Pipe at No Cost]
    C --> F[Dispatch Pipe]

This ensures traceability and quality compliance per IS 7319.

Handling of Rejected Pipes - IS 7319 Key Points

Clause 7.4: Marking and Replacement

• Rejected pipes must be clearly marked by the inspector.
• Manufacturer/seller must replace rejected pipes free of cost with pipes meeting all specifications.

Clause 7.3.2: Permissible Number of Defective Pipes

• The maximum permissible defective pipes (due to dimension, finish, straightness) is specified in Column 3 of Table 2 (not fully provided here).
• Pipes exceeding this limit are rejected.

Clause 6.1: Test Specimens

• Pipes for testing are randomly selected from stock.
• Specimens must not be pre-rejected.

Summary Table (Example from Clause 4.2 & Table 1 for Dimensions)

Important Notes:

• Rejected pipes must not be used; they must be replaced.
• Marking ensures traceability.
• Permissible dimensional variations and defects are strictly controlled.
• Replacement pipes must comply fully with IS 7319 specifications.

flowchart TD
    A[Pipe Inspection] --> B{Pipe meets specs?}
    B -- Yes --> C[Accept pipe]
    B -- No --> D[Mark pipe as Rejected]
    D --> E[Manufacturer replaces pipe free of cost]
    E --> A

This ensures quality control and compliance with IS 7319.