Steel cylinder pipe with concrete lining and coating

IS 1916 Scope: Key Specifications and Tables

IS 1916 covers specifications for pipes, including lining, coating, and plate thickness based on internal diameter.

Important Tables:

1. Minimum Thickness of Lining and Coating (Table 2, Clause 12.1)

2. Minimum Thickness of Plate (Clause 4.1)

Notes:

• Final test values must be rounded per IS 2:1960 rules.
• Refer to Annex A for related Indian Standards.

This scope ensures minimum material thicknesses for structural integrity and corrosion protection of pipes.

IS 1916: Referenced Indian Standards Overview

• Clause 2.1 states that the Indian Standards listed in Annex A are essential adjuncts to IS 1916. These referenced standards provide complementary specifications, test methods, and guidelines critical for compliance.

• Rounding off values: As per IS 2:1960, all numerical results must be rounded off maintaining the same number of significant figures as specified in IS 1916.

Commonly Referenced Standards in IS 1916 (typically in Annex A):

Key Notes:

• Refer to Annex A of IS 1916 for the complete list.
• Always cross-check referenced IS codes for detailed procedures, material specs, and testing methods.
• This ensures holistic compliance and structural integrity.

flowchart LR
  A[IS 1916] --> B[Annex A: Referenced IS Codes]
  B --> C[IS 2:1960 - Rounding Off]
  B --> D[IS 456 - Concrete Code]
  B --> E[IS 1239 - Steel Tubes]
  B --> F[IS 1608 - Concrete Testing]
  B --> G[IS 2502 - Rebar Bending]

IS 1916: Classification of Steel Cylinder Pipes with Concrete Lining

Classification by Test Pressure (Clause 3.1)

Additional Notes:

• Test pressure is the key parameter for classification.
• Values should be rounded off according to IS 2:1960 rules, maintaining the same significant figures as specified.
• Minimum plate thickness for steel cylinders is specified in Table 1 (Clause 8.2), ensuring structural adequacy.

Quick Reference: Rounding Off (IS 2:1960)

• Round off the test results to the same number of significant figures as the standard's specified value.

flowchart TD
    A[Steel Cylinder Pipes] --> B{Classification by Test Pressure}
    B --> C[Class 1: 0.5 MPa / 50 m head]
    B --> D[Class 2: 1.0 MPa / 100 m head]
    B --> E[Class 3: 1.5 MPa / 150 m head]
    B --> F[Class 4: 2.0 MPa / 200 m head]
    B --> G[Class 5: 2.5 MPa / 250 m head]
    B --> H[Special Class: >2.5 MPa / >250 m head]

This classification guides design, testing, and quality control for steel cylinder pipes under IS 1916.

IS 1916: Dimensions and Tolerances Summary

1. Internal Diameter Tolerance (Clause 4.1.1)

• For pipes ≤ 300 mm diameter:
  ±3 mm
• For pipes > 300 mm diameter:
  ±6 mm or ±1% of internal diameter (whichever is less)

2. Minimum Plate Thickness (Clause 4.1, Table 8.1)

3. Lining and Coating Thickness (Clause 12.1, Table 2)

4. Rounding Off (Clause None)

• Follow IS 2:1960 for rounding off test results, retaining the same significant figures as specified.

This ensures compliance with dimensional accuracy and protective layer requirements for cast iron pipes under IS 1916.

IS 1916: Workmanship and Finish - Key Points & Specifications

1. Pipe Length (Clause 4.2)

• Recommended length: 6 m
• Length tolerance: ±1% of agreed length (unless otherwise agreed)

2. Repair of Defects (Clause 5.2.1)

• Defects must be repaired promptly.
• Repair method: Full thickness hand trowelling (unless otherwise specified/agreed).
• Alternative repair methods require purchaser-manufacturer agreement.

3. Surface Finish (Clause 5.1.2)

• Coatings applied by rotary brushes or guniting may result in non-smooth finishes.

4. Rounding Off Values (General)

• Follow IS 2:1960 rounding rules.
• Retain the same number of significant figures as the specified value.

Summary Table: Pipe Length Tolerance

This ensures consistent quality and clear communication between purchaser and manufacturer regarding workmanship and finish.

IS 1916 - Marking Requirements (Clause 6.1):

Each pipe must be clearly marked with the following:

• Size of pipe
• Class of pipe
• Date of manufacture
• Source of manufacture

Additional Specifications:

• Rounding off values: As per IS 2:1960, test results must be rounded off to the same number of significant figures as the specified values.

• Lining and Coating Thickness (Clause 12.1, Table 2):

Summary Diagram of Marking:

graph TD
    A[Pipe] --> B[Size]
    A --> C[Class]
    A --> D[Date of Manufacture]
    A --> E[Source of Manufacture]

This ensures traceability and quality control for steel pipes under IS 1916.

IS 1916 Key Specifications for Materials

1. Minimum Thickness of Plates (Steel Cylinders) — Clause 4.1 & 8.2

2. Minimum Thickness of Lining & Coating — Clause 12.1

3. Aggregates for Concrete — Clause 11.3

• Must conform to IS 383:1970.
• Maximum aggregate size ≤ 1/3 of concrete cover thickness (inside or outside the steel cylinder).

This ensures durability, structural integrity, and proper protection of steel cylinders in water mains.

IS 1916: Steel Cylinder Key Specifications & Formulas

1. Plate Thickness (Clause 8.2 & Table 1)

• Minimum thickness of steel plates for cylinders is specified in Table 1 (not provided here).
• Ensure plate thickness ≥ specified minimum to resist design pressures.

2. Design Stress (Clause 8.1)

• Maximum tensile stress in steel under hydrostatic test pressure:
  [ \sigma_{max} \leq 200 \text{ MPa} ]
• Assumption: Concrete takes no tension; steel alone resists the pressure.

3. Hydrostatic Test (Clause 10.1)

• Test pressure = Specified hydrostatic test pressure (from Clause 3.1).
• Procedure:
  • Fill cylinder with water.
  • Maintain pressure for ≥ 1 minute.
  • Hammer cylinder lengthwise with 1 kg hammer.
  • No leakage allowed.
• Leaking cylinders may be rewelded and retested.

Typical Formula for Cylinder Thickness

For internal pressure (P), cylinder radius (r), allowable stress (\sigma), thickness (t):

[ t = \frac{P \times r}{\sigma} ]

Use (\sigma = 200 \text{ MPa}) as max allowable tensile stress.

Summary Table (Conceptual)

flowchart TD
    A[Steel Cylinder Design] --> B[Select Plate Thickness (Table 1)]
    B --> C[Calculate Thickness using t = P*r/σ]
    C --> D[Fabricate Cylinder]
    D --> E[Hydrostatic Test (≥1 min)]
    E --> F{Leakage?}
    F -- No --> G[Accept Cylinder]
    F -- Yes --> H[Reweld & Retest]
    H --> E

Note: Refer to IS 1916 Table 1 for exact minimum thickness values based on cylinder diameter and pressure.

IS 1916: Fabrication and Welding Key Points

1. Minimum Plate Thickness (Clause 4.1)

2. Welding Specifications (Clause 9.1)

• Steel cylinders formed by shaping and welding steel plates.
• Welding types: Lap or Butt welds for longitudinal and circumferential joints.
• Welding methods: Manual down-hand or automatic shielded arc welding.
• Requirements: Thorough fusion and complete penetration, plates fitted closely and held firmly.
• Reference for metal arc welding: IS 816:1969.

3. Wire Fabric Splices (Clause 13.1.2)

• Splices made by welding or suitable means.
• Fabric wrapped on shell by tack welding.

4. Electrodes for Welding (Clause 7.2)

• Electrodes must conform to IS 814 (Part 2): 1974.

flowchart TD
    A[Steel Plates] --> B[Shaping]
    B --> C[Welding]
    C --> D{Type of Weld}
    D --> E[Lap Weld]
    D --> F[Butt Weld]
    C --> G[Welding Method]
    G --> H[Manual Down-hand]
    G --> I[Automatic Shielded Arc]
    C --> J[Requirements]
    J --> K[Complete Penetration]
    J --> L[Thorough Fusion]
    J --> M[Close Fitting & Firm Holding]

This summarizes IS 1916 welding and fabrication essentials for steel cylinders.

IS 1916 Hydrostatic Test Key Points

Hydrostatic Test Pressure (Clause 3.1)

Hydrostatic Test Procedure (Clause 10.1)

• Test steel cylinder before concreting.
• Apply water pressure equal to the class test pressure.
• Maintain pressure for at least 1 minute.
• Hammer the cylinder moderately along its length with a 1 kg hammer during the test.
• Cylinder must show no leakage.
• Leaking cylinders can be rewelded and retested.

Design Stress Limit (Clause 8.1)

• Maximum tensile stress in steel under test pressure ≤ 200 MPa.
• Assumes concrete takes no tension.

Summary Formula for hoop stress in steel cylinder:

[ \sigma = \frac{P \times d}{2t} ]

Where:

• (\sigma) = hoop stress (MPa)
• (P) = test pressure (MPa)
• (d) = cylinder diameter (mm)
• (t) = steel thickness (mm)

Ensure (\sigma \leq 200 \text{ MPa}) during design.

flowchart TD
    A[Steel Cylinder] --> B[Apply Test Pressure (P)]
    B --> C[Maintain Pressure ≥ 1 min]
    C --> D[Hammer Cylinder with 1 kg Hammer]
    D --> E{Leakage?}
    E -- No --> F[Pass Test]
    E -- Yes --> G[Reweld & Retest]
    G --> F

This ensures structural integrity before concreting.

IS 1916: Key Reinforcement Specifications

• Reinforcement Standards:
  All cage reinforcement must conform to IS 432 (Part 1 & 2): 1982 (Mild steel wires and fabric).

• Minimum Reinforcement in Coating (Clause 13.1):

  • At least 3% of the steel quantity in the cylinder (based on minimum plate thickness from Table 1).
  • Use wire wound spirally or wire fabric.
  • For vibration coating, longitudinal reinforcement is mandatory.
  • Apply coating before any rusting on reinforcement.

• Clear Cover to Reinforcement (Clause 12.2):

  • Minimum 9 mm for lining.
  • Minimum 12 mm for coating.

Table 1 (Example Minimum Plate Thickness for Steel Cylinder)

(Refer IS 1916 Table 1 for exact values)

Summary Diagram of Reinforcement Cage:

graph LR
A[Steel Cylinder] --> B[Coating Layer]
B --> C[Spiral Wire Reinforcement (≥3% steel)]
B --> D[Longitudinal Wire Reinforcement (if vibration coating)]
B --> E[Clear Cover: 9mm (lining) / 12mm (coating)]

This ensures durability and structural integrity of steel pipes per IS 1916.

IS 1916: Thickness and Cover Key Specifications

1. Minimum Thickness of Lining and Coating (Clause 12.1, Table 2)

2. Minimum Thickness of Plate (Clause 4.1, Table 8.1)

3. Clear Cover to Reinforcement (Clause 12.2)

• Minimum clear cover for reinforcement:
  • 9 mm for lining
  • 12 mm for coating

4. Additional Notes (Clause 70.6)

• Compressive strength tests on concrete (150 mm cubes) per IS 516:1959.
• Mortar compressive strength tests on 70.6 mm cubes per IS 4031 (Part 6):1988.
• Water-cement ratio: minimum to achieve workable mix; no fixed limit.

This ensures durability, corrosion protection, and structural integrity of lined and coated pipes.

IS 1916: Lining and Coating Key Specifications

1. Minimum Thickness (Clause 12.1, Table 2)

2. Application Guidelines (Clause 13.3 & 13.3.3)

• Lining: Must be done at the manufacturer's works.
• Coating: Can be applied at manufacturer’s works or on-site.
• Coating Timing: Start coating only after 3 days of lining completion or when lining attains ≥10 MPa compressive strength.
• Lining must be under curing during this period.
• Coating methods: vibration, pressure application, rotary brushes, or guniting.

Summary Diagram of Process Flow

flowchart TD
    A[Lining at Manufacturer's Works] --> B[Curing Period (≥3 days or ≥10 MPa)]
    B --> C[Coating at Manufacturer or Site]
    C --> D[Coating Application Methods]
    D --> E[Vibration]
    D --> F[Pressure Application]
    D --> G[Rotary Brushes]
    D --> H[Guniting]

This ensures durability and protection of concrete pipes per IS 1916 standards.