Code for designating perforations of industrial plate sieves (identical with ISO/DIS 7806)

IS 10483: Scope & Codification Summary

• Scope: Specifies designation of perforated plates by symbols and magnitudes (Clause 3.2). Purchaser must specify size, thickness, and material besides codification.

• Hole Shapes (Clause 4.1):

  Symbol	Hole Shape Description
  R	Circular (Round)
  C	Square (sides parallel to plate edges)
  CD	Square (diagonals parallel to plate edges)
  LR	Slots with round ends
  LC	Slots with square ends

• Pitch Designation (Clause 4.4.1):

  For shapes R, C, CD, or H in U- or Z-arrangements, specify two pitches:

  • p1 (shorter pitch) × p (longer pitch)
  • If U-arrangement and p1 = Pa, only p is stated.

• Examples:

  • R10 U15 x 20 → Circular holes, 10 mm size, U-arrangement with pitches 15 mm and 20 mm
  • C5 Z15 x 20 → Square holes, 5 mm size, Z-arrangement with pitches 15 mm and 20 mm
  • C10 U20 → Square holes, 10 mm size, U-arrangement with pitch 20 mm only

Visual Summary (Mermaid.js)

graph TD
  A[Perforated Plate Codification] --> B[Hole Shape]
  B --> R[R: Circular]
  B --> C[C: Square (edges parallel)]
  B --> CD[CD: Square (diagonals parallel)]
  B --> LR[LR: Slots with round ends]
  B --> LC[LC: Slots with square ends]

  A --> P[Pitch Arrangement]
  P --> U[U-arrangement: p1 x p or p if p1=Pa]
  P --> Z[Z-arrangement: p1 x p]

Note: Refer IS 10483 figures 1, 7, 8, 9 for detailed geometry and layout.

IS 10483 Key Codification & Specifications Summary

• Hole Shapes (Clause 4.1):

  • R: Circular (round)
  • C: Square, sides parallel to plate edges
  • CD: Square, diagonals parallel to plate edges
  • LR: Slots with round ends
  • LC: Slots with square ends

• Pitch Designation (Clauses 4.4.1 & 4.4.2):

  • For R, C, CD, H shapes in U- or Z-arrangements:
    • Specify both pitches as p1 × p2, where p1 = shorter pitch.
    • If U-arrangement and p1 = p2, only p is stated.
  • For LR, LC slots in U- or Z-arrangements:
    • Pitch parallel to slot width (p1) stated first.
    • If U-arrangement and p1 = p2, only p is stated.

Example Codifications:

Notes:

• Purchaser must specify size, thickness, and material besides codification.
• Refer to IS 10483 Fig. 1, 7-12 for detailed illustrations of shapes and pitch arrangements.

flowchart LR
    A[Hole Shape] --> B{Shape Code}
    B --> R[R: Circular]
    B --> C[C: Square (edges parallel)]
    B --> CD[CD: Square (diagonals parallel)]
    B --> LR[LR: Slot with round ends]
    B --> LC[LC: Slot with square ends]

    A --> P{Pitch Arrangement}
    P --> U[U-arrangement]
    P --> Z[Z-arrangement]

    U -->|p1 = p

IS 10483: Terminology and Definitions – Key Points

• Reference Standards: Definitions are aligned with

  • IS 5421:1982 (Industrial Sieves)
  • IS 5742 (Part II)-1970 (Perforated Plates)

• Codification of Perforated Plates (Clause 3.1 & 3.2):
  The designation includes:

  • Shape of holes (symbol)
  • Aperture size (w, or w1 & w2 for slots)
  • Arrangement of holes
  • Pitch (p, or p1 & p2 if different in directions)
  • Orientation relative to plate edges

• Hole Shape Symbols (Clause 4.1):

  Symbol	Hole Shape Description	Orientation
  R	Circular (Round)	—
  C	Square, sides parallel to edges	Sides parallel to edges
  CD	Square, diagonals parallel to edges	Diagonals parallel to edges
  LR	Slots with round ends	—
  LC	Slots with square ends	—

• Purchaser Note: Specify size, thickness, and material along with codification.

flowchart TD
    A[Perforated Plate] --> B[Shape of Holes (R, C, CD, LR, LC)]
    A --> C[Aperture Size (w, w1, w2)]
    A --> D[Arrangement of Holes]
    A --> E[Pitch (p, p1, p2)]
    A --> F[Orientation to Plate Edges]

This codification ensures uniformity in specifying perforated plates for industrial sieves.

IS 10483 Codification Summary

The codification system in IS 10483 standardizes perforated plate designation using symbols and magnitudes in a specific sequence:

1. Shape of Holes (Clause 4.1)

2. Pitch Designation (Clause 4.4.1)

• For shapes R, C, CD, or H in U- or Z-arrangements, both pitches are stated as:
  p1 × p2
  where p1 = shorter pitch, p2 = longer pitch.

• For U-arrangement when p1 = p (equal pitch), only p is stated.

Examples:

• R10 U15 x 20 → Round holes, 10 mm size, U-arrangement with pitches 15 mm and 20 mm
• C5 Z15 x 20 → Square holes, 5 mm size, Z-arrangement with pitches 15 mm and 20 mm
• C10 U20 → Square holes, 10 mm size, U-arrangement with pitch 20 mm (equal pitches)

3. Additional Notes

• Purchaser must specify size, thickness, and material along with codification.
• The standard aligns with ISO/DIS 7806 for international consistency.

flowchart LR
    A[Start: Select Hole Shape] --> B{Shape Symbol}
    B -->|R| C[Round Hole]
    B -->|C| D[Square Hole (edges parallel)]
    B -->|CD| E[Square Hole (diagonals parallel)]
    B -->|LR| F[Slot with Round Ends]
    B -->|LC| G[Slot with Square Ends]
    C --> H[Specify Size (e.g., 10)]
    D --> H
    E --> H
    F --> H
    G --> H
    H --> I{Arrangement Type}
    I -->|U| J[Specify pitch p1 × p2 or p if

IS 10483: General Principles of Codification for Perforated Plates

Key Codification Rules (Clauses 3.2 & 4)

• Codification Sequence: Items of designation are expressed by symbols and magnitudes in a fixed sequence.
• Purchaser's Responsibility: Specify size, thickness, and material along with codification.

Hole Shape Symbols (Clause 4.1)

Pitch Designation for Hole Arrangements

• For R, C, CD, H shapes in U- or Z-arrangements (Clause 4.4.1):

  • Two pitches stated: p1 × p2, with shorter pitch p1 first.
  • If p1 = p2 in U-arrangement, only p is stated.

• For LR or LC shapes (slots) in U- or Z-arrangements (Clause 4.4.2):

  • Pitch parallel to slot width (p1) stated first.
  • If p1 = p2 in U-arrangement, only p is stated.

Example Codifications

Visual Summary of Pitch Notation

graph LR
  A[Hole Shape] --> B{Arrangement Type}
  B -->|U or Z| C[Two pitches:

IS 10483: Aperture Size for Perforated Plates

• Aperture Size Definition (Clause 4.2):
  Aperture size is specified in millimeters immediately after the hole shape symbol.

  • For circular holes, state diameter w (e.g., Ø10).
  • For slots, specify width w1 and length w2 separated by "x" (e.g., 5x20).
  • Refer to Fig. 2 for shape and aperture coding examples.

• Hole Arrangement (Clause 4.3):
  After aperture size, specify arrangement symbols (e.g., staggered, square) per sub-clauses 4.3.1 to 4.3.4.

• Perforation Designation (Clause 3.1):
  Perforation is designated by:

  1. Hole shape
  2. Aperture size(s)
  3. Hole arrangement
  4. Pitch p (distance between hole centers) or p1, p2 for differing directions
  5. Orientation relative to plate edges

Example Format for Perforation Designation

[Shape Symbol] [Aperture Size] [Arrangement Symbol] [Pitch] [Orientation]
e.g., C Ø10 S 20x20 0°

Key Notes:

• Aperture sizes must be in mm.
• Slots require two dimensions (width × length).
• The standard aligns with ISO/DIS 7806, ensuring international compatibility.

flowchart TD
  A[Shape of Hole] --> B[Aperture Size (w or w1 x w2)]
  B --> C[Arrangement of Holes]
  C --> D[Pitch (p or p1, p2)]
  D --> E[Orientation relative to edges]
  E --> F[Complete Perforation Designation]

This codification ensures clear, standardized communication of perforated plate specifications.

IS 10483 - Arrangement of Holes (Clause 4.3)

The code specifies symbols for hole arrangements based on geometric patterns:

• Z-Arrangement (Clause 4.3.2)

  • Holes at vertices of rectangles and intersection of diagonals.
  • Symbol: Z
  • Reference: Fig. 4

• M-Arrangement (Clause 4.3.3)

  • Holes at vertices of squares and intersection of diagonals.
  • Semi-diagonal length must be a round number.
  • Symbol: M
  • Reference: Fig. 5

• T-Arrangement (Clause 4.3.4)

  • Holes at vertices of equilateral triangles.
  • Symbol: T
  • Reference: Fig. 6

Summary Table

Visual Concept (Mermaid.js)

graph TD
    Z[Z-Arrangement]
    M[M-Arrangement]
    T[T-Arrangement]

    Z -->|Rectangle vertices + diagonals| HolesZ[Holes]
    M -->|Square vertices + diagonals| HolesM[Holes]
    T -->|Equilateral triangle vertices| HolesT[Holes]

Note: Use these symbols to specify hole patterns in drawings and documentation as per IS 10483.

IS 10483: U-Arrangement Key Points

• Definition (Clause 4.3.1):
  U-arrangement refers to holes arranged at the vertices of rectangles (Fig. 3).

• Orientation (Clause 4.5.2):

  • Orientation 1: Shorter pitch ( p_1 ) is parallel to the longer edge.
  • Orientation 2: Shorter pitch ( p_1 ) is parallel to the shorter edge.

• Pitch Notation (Clause 4.4.2):
  For slot shapes LR or LC in U-arrangements:

  • ( p_1 ) = pitch parallel to slot width (stated first).
  • If ( p_1 = p_2 ), only one pitch ( p ) is stated.

Typical Pitch Notation Examples

Summary Diagram of U-Arrangement Orientation

graph LR
A[Rectangle of holes]
A --> B[Orientation 1: p1 (shorter pitch) // longer edge]
A --> C[Orientation 2: p1 (shorter pitch) // shorter edge]

Use this info to identify hole layouts and specify pitch dimensions clearly in design per IS 10483.

IS 10483: Z-Arrangement Key Points

• Definition (Clause 4.3.2):
  Holes are arranged at the vertices and diagonals of rectangles, forming a "Z" pattern (see Fig. 4).

• Pitch Notation (Clause 4.4.2):
  For slot shapes LR or LC in Z-arrangement, the pitch parallel to slot width (p1) is stated first. If pitches are equal (p1 = p2), only one pitch p is given.

• Orientation (Clauses 4.5.2 & 4.5.3):

  • Orientation 1: Shorter pitch p1 parallel to the longer edge, slot width w1 parallel to longer edge.
  • Orientation 2: Shorter pitch p1 parallel to shorter edge, slot width w1 parallel to shorter edge.

Typical Notation Examples:

Summary Table for Z-Arrangement Parameters

flowchart LR
    A[Rectangle with holes] --> B[Vertices & Diagonals]
    B --> C[Z-Arrangement]
    C --> D[Pitch p1 (shorter), p2 (longer)]
    C --> E[Slot width

IS 10483: M-Arrangement Key Points

• Definition (Clause 4.3.3):
  M-arrangement refers to holes located at the vertices and intersections of diagonals of squares, where the semi-diagonal length is a round number.

• Notation (Clause 4.4.3):
  Only pitch (p) is specified for M-arrangements (see Fig. 13).

• Geometry:

  • Holes are placed at square vertices and center points.
  • Semi-diagonal length ( \frac{a\sqrt{2}}{2} = p ), where (a) is the square side length.

• Typical Hole Layout:

• Pitch (p):
  ( p = \frac{a \sqrt{2}}{2} ) (semi-diagonal length)

Summary Table for M-Arrangement

Visual Concept (M-Arrangement)

graph TD
    A(( )) --- B(( ))
    |         |
    C(( )) --- D(( ))
    E(( )) -- Center((•))
    A[Top Left] --- B[Top Right]
    C[Bottom Left] --- D[Bottom Right]
    E[Center]

• Holes at vertices A, B, C, D and center E.

Use: M-arrangement is used when holes need symmetric distribution on square grids with center hole, common in structural connections requiring uniform load distribution.

IS 10483 — T-Arrangement Key Points

• Definition (Clause 4.3.4):
  Holes arranged so their midpoints form vertices of equilateral triangles → T-arrangement (Fig. 6).

• Orientation (Clause 4.5.1):

  • Orientation 1: Pitch ( p ) parallel to longer edge (Fig. 15).
  • Orientation 2: Pitch ( p ) parallel to shorter edge (Fig. 16).

• Pitch Specification (Clause 4.4.3):
  For T-arrangements, only one pitch ( p ) is specified, as the equilateral triangle defines uniform spacing.

Key Geometric Relation for T-Arrangement

• Holes form equilateral triangles with side = pitch ( p ).
• Distance between rows (vertical spacing) = ( \frac{\sqrt{3}}{2} p ).

Summary Table

graph TD
  A[Holes at vertices of equilateral triangles]
  A --> B[Pitch p between holes]
  B --> C[Row spacing = (√3/2) * p]
  C --> D[Orientation 1: p || longer edge]
  C --> E[Orientation 2: p || shorter edge]

This arrangement optimizes hole density and uniformity in drilling patterns per IS 10483.

IS 10483 - Pitch Specifications Summary

• Pitch Definition (Clause 4.4):
  Pitch or pitches of hole arrangements shall be stated in millimetres following hole arrangement symbols.

• For Shapes R, C, CD, H (Clause 4.4.1):

  • Two pitches, shorter ( p_1 ) and longer ( p_2 ), are stated as ( p_1 \times p_2 ).
  • If ( p_1 = p_2 ) in U-arrangement, only ( p ) is stated.
  • Example: R10 U15 × 20 (Fig. 7), C5 Z15 × 20 (Fig. 8), C10 U20 (Fig. 9).

• For Shapes LR or LC (Slots) in U- or Z-arrangements (Clause 4.4.2):

  • Pitch parallel to slot width ( p_1 ) stated first.
  • If ( p_1 = p_2 ) in U-arrangement, only ( p ) is stated.
  • Example: LR3 × 10 U12 × 18 (Fig. 10), LC3 × 10 Z18 × 12 (Fig. 11), LC10 × 15 U20 (Fig. 12).

• Orientation of Pitches (Clause 4.5.2):

  • Orientation 1: Shorter pitch ( p_1 ) parallel to longer edge.
  • Orientation 2: Shorter pitch ( p_1 ) parallel to shorter edge.

Typical Pitch Notation Examples:

Visual Summary (Pitch Orientation):

graph LR
    A[Longer

IS 10483 - Orientation of Perforations: Key Points

1. Designation of Perforation (Clause 3.1)

• Shape of holes (circular, slots, etc.)
• Aperture size: w (for holes), w1 & w2 (for slots)
• Arrangement of holes (T, U, Z, etc.)
• Pitch: p (or p1, p2 if different in two directions)
• Orientation: relative to plate edges

2. Orientation Definitions (Clause 4.5)

• Orientation 1 and Orientation 2 depend on hole arrangement and plate edges.

3. T-Arrangement (Clause 4.5.1)

• Orientation 1: Pitch p parallel to longer edge
• Orientation 2: Pitch p parallel to shorter edge

4. Slots (LR and LC shapes) in U- or Z-arrangements (Clause 4.5.3)

• Orientation 1: Width w1 parallel to longer edge
• Orientation 2: Width w1 parallel to shorter edge

Visual Summary (Mermaid Diagram)

graph LR
    A[Plate Edges] --> B[T-Arrangement]
    B --> C1[Orientation 1: p || Longer Edge]
    B --> C2[Orientation 2: p || Shorter Edge]

    A --> D[Slots (LR, LC) in U/Z-Arrangement]
    D --> E1[Orientation 1: w1 || Longer Edge]
    D --> E2[Orientation 2: w1 || Shorter Edge]

Practical Notes:

• Orientation affects performance under operating conditions.
• Choose orientation based on load direction and manufacturing convenience.
• Refer to Figures 15-20 in IS 10483 for detailed layouts.

This ensures correct alignment of perforations for structural efficiency and durability.

IS 10483: Examples of Designations for Perforated Plates

Key Codification Elements (Clause 4):

• Shape of Holes (Clause 4.1):

• Pitch Designation (Clause 4.4.1):

  • For shapes R, C, CD in U- or Z-arrangements, specify two pitches:
    • p1 (shorter pitch) × p2 (longer pitch)
  • If U-arrangement and p1 = p (pitch along one direction), only p is stated.

Examples:

Note: Purchaser must specify size, thickness, and material along with the codification.

flowchart LR
    A[Shape of Holes] -->|R| B(Round)
    A -->|C| C(Square sides parallel)
    A -->|CD| D(Square diagonals parallel)
    A -->|LR| E(Slots round ends)
    A -->|LC| F(Slots square ends)

    G[Arrangement] -->|U| H(U-arrangement)
    G -->|Z| I(Z-arrangement)

    H & I --> J[Specify pitches p1 x p2]
    H --> K[If p1 = p, specify p only]

This codification ensures clear, standardized designation of perforated plates per IS 10483.

IS 10483 - Notes for Purchasers: Key Points & Codification

• Purchaser's Responsibility (Clause 3.2):
  Specify size, thickness, and material of the perforated plate along with the codification.

• Codification Elements (Clause 3.1):

  • Shape of holes (e.g., R, C, LR, LC)
  • Aperture size(s) (w or w1, w2 for slots)
  • Hole arrangement type (U or Z)
  • Pitch(es): single pitch (p) or two pitches (p1, p2) if different
  • Orientation relative to plate edges

• Pitch Notation for U- or Z-arrangements (Clauses 4.4.1 & 4.4.2):

  • For shapes R, C, CD, H: State shorter pitch p1 first, then longer p2 as p1 x p2 (e.g., R10 U15 x 20).
  • If pitches equal in U-arrangement, state only p (e.g., C10 U20).
  • For slots (LR, LC), pitch parallel to slot width is p1; notation similar to above.

Example Codifications:

Summary Diagram of Codification Components

graph TD
  A[Perforation Designation] --> B[Shape of Holes]
  A --> C[Aperture Size (w, w1, w2)]
  A --> D[Hole Arrangement (U or Z)]
  A --> E[Pitch (p or p1 x p2)]
  A