Test Sieves: Part-II Perforated Plate Test Sieves

IS 460 Part 2 - Scope: Key Specifications & Tables

This part covers specifications for test sieve frames and apertures used in material testing.

1. Test Sieve Frame Dimensions (Clause 4.2, Table 4)

Note: Sieves with 25 mm depth from top edge to sieving surface may also be supplied.

2. Aperture Sizes, Tolerances & Pitches (Clause 3.3.1, Table 2)

IS 460 Part 2 — Designation and Marking Key Points

1. Labeling Requirements (Clause 10.1)

Each sieve frame must have a label with:

• Designation (bold, left side)
• Material of perforated plate
• Material of sieve frame
• Maker's name or trademark
• Identification number
• Plate thickness (if requested)

Example label:

75 mm IS SIEVE (R)
STAINLESS STEEL PLATE BRASS FRAME No. 12345

2. Plate Thickness (Clause 3.4.1, Table 3)

3. Aperture Pitch & Tolerances (Clause 3.3.1, Table 2)

• Nominal aperture size (w) with tolerance on aperture size and nominal pitch (P).
• Pitch is center-to-center distance between holes.
• Applies to round and square holes.

IS 460 Part 2 - Sieving Medium (Test Sieves)

While Clause 5.6(b) mentions the 5.6 mm IS Sieve (R), the standard refers to Indian Standard Specification for Test Sieves for details on the sieving medium.

Key Points on Sieving Medium (from IS specifications):

• Material: Test sieves are generally made of stainless steel wire mesh or mild steel wire cloth.
• Mesh Size: Defined by the number of openings per linear inch or by aperture size (e.g., 5.6 mm).
• Frame: Rigid, usually metallic, to maintain shape and tension of the mesh.
• Tolerances: Aperture size tolerance ±5% for coarse sieves (e.g., 5.6 mm).
• Standard IS Sieves: Common sizes include 75 mm, 63 mm, 50 mm, 37.5 mm, 26.5 mm, 19 mm, 9.5 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 µm, 300 µm, 150 µm, 75 µm.

Example: Aperture Size and Wire Diameter for 5.6 mm Sieve

Usage:

• Used for coarse aggregate size separation.
• Ensures uniformity in grading.

graph TD
A[Sieving Medium] --> B[Wire Mesh Material]
A --> C[Frame Material]
A --> D[Mesh Aperture Size]
B --> E[Stainless Steel]
B --> F[Mild Steel]
D --> G[Specified Aperture (e.g., 5.6 mm)]
D --> H[Wire Diameter]

For detailed specifications, refer to IS 460 Part 2 and IS 460 Part 1 or the relevant IS test sieve standards (e.g., IS 460, IS 460 Part 1).

IS 460 Part 2 — Test Sieve Frame Key Specifications

1. Frame Shapes & Sizes (Clause 4.2, Table 4)

• Note: Sieves may also be supplied with 25 mm depth (C) if desired.
• Dimensions A and B ensure nestability per Clause 6.1.

2. Material (Clause 4.1)

• Frames should be made from materials listed in Table 1 (e.g., brass, stainless steel).
• Manufacturer should declare material grade if requested.

3. Perforated Plates (Clause 3.6.1)

• Holes must be uniformly and cleanly punched.
• Avoid partial apertures after mounting.

Diagram: Test Sieve Frame Dimensions (Fig. 3)

graph TD
    A[Top Internal Diameter/Length (A)]
    B[Bottom External Diameter/Length (B)]
    T[Thickness (T)]
    E[Effective Sieving Surface (E)]
    C[Depth from Top Edge to Sieving Surface (C)]
    D[Depth from Bottom Edge to Sieving Surface (D)]
    Frame[Test Sieve Frame]

    Frame --> A
   

Workmanship - IS 460 Part 2 (Clause 3.6)

Key Specifications:

• Workmanship ensures apertures (holes) meet dimensional accuracy and tolerances for sieves.
• Aperture sizes and pitches must conform to Table 2 (Clause 3.3.1) for round and square holes.

Important Tables & Values:

(Refer full Table 2 for all sizes)

Additional Notes:

• Aperture tolerances are critical for sieve accuracy and performance.
• Preferred pitches ensure uniformity and structural integrity.
• Non-ISO sizes with specified tolerances (e.g., 200 mm ±1.55 mm) are allowed (Clause 3.2.3).
• Workmanship includes smooth edges, consistent aperture shapes, and proper alignment.

Summary Diagram of Aperture Pitch and Size Relationship:

graph LR
A[Nominal Aperture Size w] --> B[Tolerance on Aperture Size]
A --> C[Preferred Nominal Pitch P]
C --> D[Permissible Pitch Range (Pmin to Pmax)]

Ensure: Aperture sizes and pitches strictly follow IS 460 Part 2 Table 2 for reliable sieve performance and durability.

Here are the key formulas, tables, and specifications for Dimensions and Tolerances from IS 460 Part 2 (1985):

1. Aperture Size and Tolerances (Clause 3.2.1, 3.2.3)

• Nominal aperture size (w) applies to each mild-section of square holes and diameter of round holes.
• Tolerance on individual aperture size (mm):

2. Aperture Pitch (Clause 3.3.1, Table 2)

• Nominal pitch P applies to round and square holes.
• Key excerpt from Table 2:

Note: Sizes marked with '' are principal ISO sizes.*

3. Plate Thickness (Clause 3.4.1, Table 3)

IS 460 Part 2: Arrangement of Holes (Clause 3.5)

1. Hole Arrangement (Clause 3.5.1)

• Round holes: Centers located at the apices of equilateral triangles (Fig. 1).
• Square holes: Arranged in line, mid-points at vertices of squares (Fig. 2).

2. Corner Radius of Square Holes (Clause 3.5.2)

• Maximum corner radius, r_max (in mm), for square holes:

  [ r_{max} = 0.05 \times w + 0.30 ]

  where w = nominal aperture size (mm).

3. Nominal Aperture and Tolerances (Clause 3.2.1)

• Nominal aperture w applies to:
  • Each mild section of square holes.
  • Diameter of round holes.
• Tolerances are specified in Table 2 (not provided here).

Visual Summary of Hole Arrangements

graph TD
  A[Round Holes] --> B[Centers at apices of equilateral triangles]
  C[Square Holes] --> D[Mid-points at vertices of squares]

Key takeaway:
For square holes, ensure corner radius does not exceed (0.05w + 0.30) mm, and arrange holes per IS 460 Part 2 figures for uniformity and accuracy.

IS 460 Part 2: Testing and Calibration Key Points

1. Test Sieve Frames (Clause 4.2, Table 4)

• Shapes: Round or Square
• Nominal Sizes: 200 mm, 300 mm, 450 mm
• Key Dimensions (mm):

• Sieves may also have 25 mm depth from top edge to sieving surface if desired.
• Frames must be nestable (Clause 6.1).

2. Aperture Size and Pitch (Clause 3.3.1, Table 2)

• Apertures are round or square.
• Nominal aperture size (w) with tolerance and pitch (P):

IS 460 Part 2: Information to be Supplied by Purchaser

Key Purchaser Requirements (Clause 9.1)

The purchaser must specify:

• Designation of sieve
• Sieving medium: Material & hole shape
• Frame: Shape, size, material
• Receiver: Whether required
• Cover: Whether required
• Calibration test: Whether needed
• Plate thickness statement: Whether required

Important Tables & Specifications

1. Plate Thickness (Clause 3.4.1, Table 3)

2. Aperture Size Tolerances & Pitch (Clause 3.3.1, Table 2)

*Note: Table covers round and square holes

Materials for Perforated Plates and Frames (IS 460 Part 2)

1. Materials (Clause 3.1 & Table 1)

Perforated plates and frames shall be made from:

*Mild steel is not permitted anymore for plates and frames.

2. Plate Thickness (Clause 3.4.1 & Table 3)

3. Frame Material (Clause 4.1.1)

• Brass and stainless steel sheets: Recommended for all frame sizes.
• Galvanized and electroplated steel sheets: Allowed only for frames ≥ 300 mm.

This ensures durability, corrosion resistance, and effective sieving performance.

IS 460 Part 2 - Plate Thickness (Clause 3.4.1 & Table 3)

Key Specifications for Plate Thickness:

Additional Notes:

• Material: Brass and stainless steel sheets are recommended for all frame sizes.
• Galvanized and electroplated steel are allowed only for frames ≥ 300 mm.
• Mild steel is not permitted for perforated plates or frames.
• Thickness selection impacts the effective sieving surface and durability.

This table guides nominal thickness selection based on aperture size to ensure structural integrity and performance.

IS 460 Part 2: Surface Finish and Sealing - Key Points

Surface Finish (Clause 5.1)

• Sieving surface, frame receiver, and cover must be smoothly finished.
• Seal between frame and sieving medium must prevent lodging of material.
• No lacquer coating on surfaces contacting the sample to avoid contamination.

Sealing

• Seal design must ensure tight contact to avoid particles lodging.
• Smooth surfaces aid in effective sealing and cleaning.

Aperture Pitch & Tolerances (Clause 3.3.1 & Table 2)

Refer to full Table 2 for all sizes.

Plate Thickness (Clause 3.4.1 & Table 3)

Test Sieve Frame Dimensions (Clause 4.2 & Table 4)

| Shape | Nominal Size (mm) | Top Internal Diameter (A) | Bottom External Diameter (

IS 460 Part 2 - Non-ISO Sizes Summary

1. Non-ISO Sizes Usage

• Allowed only beyond 125 mm aperture size for round holes.
• Used only if nearest ISO sizes unavailable (Clause 3.2).

2. Non-ISO Aperture Sizes & Tolerances (Clause 3.2.3)

3. Aperture Pitch & Tolerances for Round/Square Holes (Table 2, Clauses 3.3.1 & 3.3.2)

* Principal ISO sizes; '+' indicates temporarily permitted sizes.

4. Test Sieve Frame Dimensions (Clause 4.2, Table 4)

IS 460 Part 2 - Key References to Related Standards: Aperture & Plate Specifications

1. Aperture Tolerances & Pitches (Clause 3.3.1, Table 2)

• Applies to round and square holes.

• Nominal aperture size (w) vs. Tolerance on aperture size and Nominal pitch (P):
  | Aperture Size (mm) | Tolerance (mm) | Preferred Pitch P (mm) | Pitch Range (mm) | |--------------------|----------------|-----------------------|------------------| | 125 | ±1.00 | 160 | 143 - 184 | | 90 | ±0.80 | 112 | 101 - 129 | | 40 | ±0.45 | 50 | 45 - 57.5 | | 10 | ±0.21 | 12.6 | 11.3 - 14.5 | | 2 | ±0.09 | 3.3 | 2.8 - 3.8 |

• Sizes marked '*' are principal ISO 565-1983 sizes.

2. Nominal Plate Thickness (Clause 3.4.1, Table 3)

3. Test Sieve Frames (Clause 4.2, Table 4)

• Shapes: Round or Square
• Sizes: 200, 300, 450 mm nominal
• Key dimensions:
  • Thickness: 0.45 to 1.0 mm
  • Effective sieving surface: 185 to 425 mm
  • Depth from top edge: 50 to 100 mm

Here are the key formulas, tables, and specifications from IS 460 Part 2 (1985) Annexures and Figures related to test sieves:

1. Test Sieve Frame Dimensions (Table 4, Clause 4.2)

• Note: Sieves with 25 mm depth from top edge to sieving surface may be supplied.
• Frames are nestable as per Clause 6.1.

2. Aperture Tolerances and Pitch (Table 2, Clauses 3.2.1, 3.3.1)

• Aperture size tolerance and nominal pitch (P) for round and square holes: