surface boxes for sluice valves
1979 Edition

Overview of Scope and Primary Specifications

• Scope: Defines dimensions and specifications for rectangular cast iron surface boxes suitable for sluice valves sized between 50 mm and 1200 mm.

• Dimensions (Clause 5.1):
  Must strictly follow the measurements provided in Fig. 1, all expressed in millimetres.

• Minimum Weight (Clause 6.1):
  Surface boxes are required to have a mass not less than 33 kg to ensure strength and durability.

• Rounding Off (Clause 0.4):
  Test results or calculated values should be rounded according to IS 2-1960, maintaining the number of significant digits as specified.

• Materials:

  • Grey iron castings conforming to relevant standards.
  • Mild steel wire for engineering use as per updated revisions.
  • Hot-dip galvanizing is recommended for corrosion resistance.

Typical Dimensions (refer to Fig. 1 - rectangular surface box)

(Dimensions vary by valve size; consult Fig. 1 in the standard for precise values.)

flowchart LR
    A[Sluice Valve Size (50-1200 mm)] --> B[Determine Surface Box Dimensions]
    B --> C[Conform to Fig. 1 Measurements]
    C --> D[Ensure Minimum Weight ≥ 33 kg]
    D --> E[Apply Material Requirements]
    E --> F[Round Values per IS 2-1960]

Refer to Fig. 1 in the standard for detailed dimensional data.

Material Requirements and Specifications

• Dimensions (Clause 5.1 & Fig. 1):
  Surface boxes must adhere to the dimensional guidelines given in Fig. 1 (rectangular design for sluice valves).

• Minimum Weight (Clause 6.1):
  Each surface box should weigh no less than 33 kg.

• Dimensional Tolerances (Clause 5.2):

  Dimension Range	Allowed Tolerance
  Up to 10 mm	+2 mm
  10 mm to 50 mm	±2 mm
  Above 50 mm	±5 mm

• Material Standards:

  • Grey iron castings complying with the third revision of the relevant IS specification.
  • Mild steel wire as per the second revision for engineering purposes.
  • Hot-dip galvanizing is advised to prevent corrosion.

• Rounding Off (Clause 0.4):
  Numerical results must be rounded in line with IS 2-1960, retaining significant figures as per the standard.

These specifications ensure that surface boxes are manufactured with precise dimensions, quality materials, and adequate durability.

Key Points on Manufacturing and Workmanship

• Inspection Access (Clause 7.1):
  Manufacturers must allow reasonable inspection opportunities during production. Purchasers may examine the surface boxes before the application of protective coatings.

• Protective Cover Surface (Clause 4.2):
  Covers should feature a non-slip texture and have the letter 'W' cast on the top surface unless otherwise agreed.

• Dimensional Compliance (Clause 5.1):
  All measurements must correspond to those illustrated in Fig. 1 of the standard.

• Hinge Pin Specification (Clause 2.2):
  The hinge pins must be galvanized mild steel in accordance with IS 280-1972 and galvanized following IS 2629-1966.

Summary Table: Manufacturing and Workmanship

flowchart TD
    A[Start Manufacturing] --> B[Inspection Facilities Provided]
    B --> C[Fabricate Surface Box]
    C --> D[Pre-Coating Inspection by Buyer]
    D --> E[Apply Protective Coating]
    E --> F[Final Product with Non-Slip Cover ('W')]

Refer to Fig. 1 in IS 3950 for exact sizing and tolerance details.

Construction Requirements for Surface Boxes

1. Casting Quality (Clause 3.1)

• Castings must be sound, clean, and free from defects such as porosity, blow holes, hard spots, cold shuts, chills.
• They should be well dressed and fettled for smooth finish.
• No voids from shrinkage or gas inclusions are permissible.

2. Dimensional Requirements (Clause 5.1)

• Must comply with the dimensions indicated in Fig. 1 (rectangular surface box).
• All measurements in millimetres.
• Minimum weight of each surface box is 33 kg (Clause 6.1).

3. Material Standards

• Grey iron castings as per third revision of the relevant IS specification.
• Mild steel wire per second revision for engineering use.
• Recommended hot-dip galvanizing for corrosion protection.

Typical Dimensions (from Fig. 1):

Construction Summary Diagram:

graph TD
A[Surface Box] --> B[Cast to Specified Dimensions]
A --> C[Free from Defects]
A --> D[Minimum Weight 33 kg]
A --> E[Galvanized for Protection]

Always consult Fig. 1 in IS 3950 for exact dimension details based on sluice valve size.

Dimensions and Tolerances for Surface Boxes

Critical Dimensions (Clause 5.1)

• Dimensions must match those shown in Fig. 1 (typical rectangular surface box for sluice valve).
• All sizes are specified in millimetres.

Permissible Tolerances (Clause 5.2)

Additional Specifications

• Cover Surface (Clause 4.2): Must feature a non-slip finish with letter 'W' cast unless otherwise agreed.
• Minimum Weight (Clause 6.1): Boxes must weigh at least 33 kg.

Tolerance Summary Table

These parameters guarantee manufacturing accuracy while maintaining functionality and safety for grey iron surface boxes.

Minimum Mass Requirements for Surface Boxes

• Minimum Weight: Each surface box should not weigh less than 33 kg (Clause 6.1).

• Dimensions and Tolerances:

  • Must conform to the sizes specified in Fig. 1 (rectangular surface box for sluice valves) (Clause 5.1).
  • Tolerances on dimensions are as follows:

    Size Range (mm)	Tolerance (±)
    Up to 10	2 mm
    10 to 50	2 mm
    Above 50	5 mm

• Material Requirements:

  • Grey iron castings per third revision of relevant IS standards.
  • Mild steel wire per second revision for general engineering use.
  • Hot-dip galvanizing recommended to prevent corrosion.

• Value Rounding:

  • Round test results according to IS 2-1960, preserving significant figures (Clause 0.4).

These mass and dimensional standards ensure the structural soundness and uniformity of surface boxes in water supply systems.

Inspection Guidelines and Requirements

• Inspection Access (Clause 7.1): Manufacturers must permit reasonable inspection during production stages. Buyers have the right to inspect surface boxes prior to coating application.

• Minimum Weight (Clause 6.1): Surface boxes must weigh no less than 33 kg.

• Dimensions (Clause 5.1): Must strictly follow Fig. 1 (rectangular surface boxes for sluice valves), all dimensions in millimeters.

• Rounding Procedure (Clause 0.4): Test outcomes are to be rounded according to IS 2:1960, maintaining significant figures consistent with standard values.

Inspection Summary Table

Protective Coating Note

Refer to recommended hot-dip galvanizing procedures for coating standards.

flowchart TD
    A[Start Production] --> B{Manufacturer Inspection}
    B -->|Yes| C[Provide Inspection Access]
    C --> D{Buyer Requests Inspection?}
    D -->|Yes| E[Inspection Before Coating]
    D -->|No| F[Proceed to Coating]
    E --> F
    F --> G[Apply Protective Coating]
    G --> H[Final Product]

This process ensures quality assurance throughout key manufacturing phases.

Specifications for Protective Coating on Surface Boxes

Requirements (Clause 8.1)

• Preparation: Surface boxes must be cleaned thoroughly and dried before coating.
• Coating Material: Application of a bitumen or tar-based compound.
• Coating Characteristics:
  • Should be smooth and adhere firmly.
  • Must not flow at temperatures up to 63°C.
  • Must resist chipping or brittleness at temperatures down to 15°C.

Inspection (Clause 7.1)

• Inspection facilities must be made available before coating.
• Purchasers may examine surface boxes prior to coating application.

Additional Details

• Minimum weight requirement: 33 kg (Clause 6.1).
• Covers to have non-slip surface with letter 'W' cast unless otherwise specified (Clause 4.2).
• Dimensions and tolerances conform with IS 3950 (millimetres).

Coating Properties Table

Process Flow Diagram

flowchart TD
    A[Manufactured Surface Box] --> B[Clean and Dry Surface]
    B --> C[Buyer Inspection]
    C --> D[Dip in Bitumen/Tar Coating]
    D --> E[Drying and Quality Check]

This coating procedure ensures long-lasting protection against moisture and corrosion as per IS 3950.

Marking Requirements for Cast Iron Surface Boxes

• Marking Placement: Markings must be cast onto each surface box.
• ISI Certification Mark (Clause 9.1.1): May be included to indicate compliance with Indian Standards, subject to licensing under the Indian Standards Institution (Certification Marks) Act.
• Cover Marking: The top surface of covers must feature a non-slip finish with the letter 'W' cast, unless otherwise specified (Clause 4.2).
• Dimensional Compliance for Marking: Markings must comply with the dimensional requirements in Fig. 1 (Clause 5.1).
• Additional Markings: Other letters may be added by mutual agreement between buyer and manufacturer.

Marking Summary Table

Conceptual Marking Diagram

graph TD
    A[Surface Box Cover] --> B[Non-slip Texture]
    B --> C[Letter 'W' Cast]
    B --> D[Optional Additional Letters]
    A --> E[Optional ISI Certification Mark]

This marking system ensures safety, standard compliance, and easy identification in line with IS 3950.