perforated concrete pipes
1974 Edition

Overview of Perforated Concrete Pipes: Scope & Key Tables

Scope: Defines necessary dimensions, physical characteristics, and sampling/testing requirements for underdrainage perforated concrete pipes.

Sampling & Compliance (Clause 7.2.2, Table 7.1)

Dimensional & Physical Criteria (Clause 4.2, Table 1)

Summary of Key References and Specifications in IS 7319

Sampling and Acceptance (Clause 7.2.2, Table 2)

Dimensions & Physical Characteristics (Clause 4.2, Table 1)

Material Requirements under IS 7319 (Clause 4.2 and related sections)

1. Permitted Dimensional Deviations (Clause 4.2.1)

• Variations from the sizes in Table 1 must remain within specified limits.
• Pipes with thicker walls than standard may be produced upon agreement, with socket diameters adjusted accordingly.

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

• Note: Increasing barrel thickness requires increasing socket inside diameter by twice that increase.

3. Material Standards 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)
• Code of Practice for Plain and Reinforced Concrete (IS 456)
• Concrete Strength Testing Methods (IS 516)

4. Sampling and Testing (Clause 7.2.2)

| Lot Size | Sample Size (Clauses 4 & 5) | Allowed Defects | Test Sample Size (Clause 6.2) |

Dimensions and Tolerances for Perforated Concrete Pipes as per IS 7319

Core Specifications (Clause 4.2 & Table 1)

Allowed Deviations (Clause 4.2.1)

• Length tolerance: ±1% of nominal length
• Internal diameter for pipes ≤ 300 mm: +3 mm

Additional Notes

• An increase in barrel thickness requires socket inside diameter to be increased by twice that thickness increment.
• Socket thickness is measured 6 mm from the pipe’s outer end.

Formula for Socket Diameter Adjustment:

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

flowchart LR
    StandardThickness[Standard Barrel Thickness] --> IncreaseThickness[Increase Barrel Thickness]
    IncreaseThickness --> AdjustSocket[Increase Socket Diameter by 2 × ΔT]
    AdjustSocket --> MaintainFit[Ensure Proper Socket Fit]

Manufacturing Guidelines per IS 7319

1. Agreement on Additional Requirements (Clause 5.3.1)

• Any conditions beyond the standard must be agreed upon by both manufacturer and buyer.

2. Rounding Off Test Data (Clause 0.4)

• Test outcomes should be rounded following IS 2-1960 standards.
• Retain the same number of significant digits as the specified values.

3. Sampling Plan (Clause 7.2.2, Table 7.1)

4. Dimensional and Physical Criteria (Clause 4.2, Table 4.1)

Testing Requirements and Procedures (IS 7319 Clauses 7.2 & 7.2.2)

1. Quantity of Tests

• The number of samples and permitted failures depend on the size of the lot.
• Refer to Table 7.1 (Clause 7.2.2) for sampling and acceptance criteria:

• Pipes subjected to tests under Clause 6.2 are chosen from those that have passed initial inspections (Clause 7.2.1).

2. Rounding of Results

• Test outcomes must be rounded in accordance with IS 2:1960 to maintain consistency.

Summary Flowchart:

digraph TD
    A[Determine Lot Size] --> B[Identify Sample Size]
    B --> C{Test Category}
    C -->|Clauses 4 & 5| D[Apply Sample & Defect Limits]
    C -->|Clause 6.2 Tests| E[Select Test Samples]
    D & E --> F[Perform Testing]
    F --> G[Round Off Results]
    G --> H[Decide on Compliance]

Conformity Requirements (Clause 7.3 of IS 7319)

A batch is considered acceptable when it meets the provisions of Clauses 7.3.2, 7.3.3, and 7.3.3.1; otherwise, it is rejected.

Sample Size and Defect Allowance (Clause 7.2.2, Table 7.1)

Interpretation:

• Sample size defines how many pipes are tested per lot.
• Permissible number indicates the maximum defective pipes allowed for acceptance.
• Additional samples are required for tests specified in Clause 6.2.

Additional Specifications (Clause 5.4.2):

• Pipe bends must be manufactured at angles of 90°, 45°, and 22.5°.
• Curves should closely match the specified radii.

Summary: Utilize Table 7.1 to determine sampling and defect tolerance limits for lot acceptance and verify pipe curvature as per Clause 5.4.2.

Marking Requirements for Perforated Concrete Pipes (IS 7319 Clause 8.1)

Each manufactured pipe must be distinctly marked with:

• Pipe classification or grade
• Date of production
• Manufacturer’s name or trademark
• Identification of the manufacturing facility

Markings should be either indented on the pipe surface or applied using waterproof paint to ensure long-lasting legibility.

Handling of Rejected Pipes (Clause 7.4)

• Inspected pipes that fail to meet criteria must be visibly marked as rejected by the inspector.
• Such pipes must be replaced by the manufacturer or seller without additional charge.

Sampling and Testing Summary (Clause 7.2.2, Table 7.1)

Additional Notes

• Test data must be rounded off as per IS 2:1960.
• Agreement between supplier and purchaser is necessary for certain provisions (Clause 5.3.1).

flowchart TD
    A[Pipe Production Completed] --> B{Apply Markings}
    B -->|Class, Date, Manufacturer, Plant| C[Mark Pipe]
    B -->|If Rejected| D[Mark as Rejected]
    D --> E[Replace Defective Pipe Free]
    C --> F[Dispatch for Use]

Management of Rejected Pipes as per IS 7319

Clause 7.4: Identification and Replacement

• Pipes failing inspection must be clearly marked as rejected by the examining authority.
• The manufacturer or supplier is obligated to replace rejected pipes at no extra cost, ensuring replacements fully comply with specifications.

Clause 7.3.2: Allowable Number of Defective Pipes

• The maximum number of defective pipes related to dimensions, surface finish, or straightness is specified in the relevant acceptance tables.
• Pipes exceeding these limits are to be rejected.

Clause 6.1: Test Sample Selection

• Pipes chosen for testing are selected at random from the available stock.
• Samples must not be pre-designated as defective prior to testing.

Summary Table of Key Dimensions (Clause 4.2, Table 1)

Important Points:

• Pipes marked as rejected must not be used.
• Proper marking facilitates traceability.
• Dimensional tolerances and defects are strictly regulated.
• Replacement pipes must adhere fully to the standard’s requirements.

flowchart TD
    A[Inspection] --> B{Pipe Meets Standards?}
    B -- Yes --> C[Accept Pipe]
    B -- No --> D[Mark as Rejected]
    D --> E[Replace Pipe at No Cost]
    E --> A