Standard Operating Procedure (SOP)

Here’s a complete Standard Operating Procedure (SOP) for the Inspection and Numbering of Sieves/Screens, commonly used in pharmaceutical, food, or chemical manufacturing. This ensures traceability, maintenance, and compliance with quality and GMP standards.

1.0 Objective

To define the procedure for the inspection, numbering, and proper documentation of sieves/screens to ensure identification, traceability, and compliance with GMP requirements.

2.0 Scope

This SOP is applicable to all sieves/screens used in manufacturing processes such as milling, sifting, or granulation in [Company Name].

3.0 Responsibility

4.0 Definitions

• Sieve/Screen: A mesh device used to separate particles by size during material processing.

• Mesh Size: The number of openings per linear inch of the sieve screen.

• Identification Number (ID No.): A unique number assigned to each sieve/screen for tracking and record-keeping.

5.0 Materials and Equipment Required

• Permanent marker or metal engraver

• Magnifying glass (if needed for inspection)

• Sieve/Screen Inspection Logbook

• Approved status labels (“Cleaned,” “To Be Cleaned,” “Rejected”)

• Light source or backlight for mesh inspection

6.0 Procedure

6.1 New Sieve/Screen Inspection and Numbering

1. On receipt of a new sieve/screen, verify it against the purchase order and specifications.

2. Visually inspect the mesh for:

   • Uniform mesh size

   • No damage, tears, or deformation

   • Secure welding/joints

   • No rust, contamination, or discoloration

3. Check and verify mesh size using standard tools (if required).

4. If found satisfactory, assign a unique identification number (e.g., S-001, S-002…).

5. Number the sieve/screen using:

   • Engraving tool (preferred, for permanent marking), OR

   • Permanent marker on the outer ring (if engraving not feasible)

6. Record the details in the Sieve/Screen Register:

   • Sieve ID

   • Mesh size

   • Date of inspection

   • Status (Approved/Rejected)

   • Inspector’s signature

7. Affix an “Approved” label to the sieve if it passes inspection.

6.2 Routine Inspection

1. Before use, inspect sieves/screens for:

   • Mesh damage, bending, or clogging

   • Cleanliness and absence of foreign particles

2. After cleaning, inspect again before storage.

3. Record any damage found and tag as “Rejected” if not suitable for use.

4. Remove rejected sieves from the area and send for disposal or maintenance.

7.0 Acceptance Criteria

• Mesh is clean, uniform, and undamaged

• No corrosion, tears, or deformations

• Clearly visible and legible identification number

8.0 Documentation

Maintain a Sieve/Screen Register with:

• ID Number

• Mesh size

• Date of issue

• Status (In use / Cleaned / Rejected)

• Remarks and signatures

9.0 Abbreviations

• SOP: Standard Operating Procedure

• QA: Quality Assurance

• ID: Identification

• GMP: Good Manufacturing Practice

10.0 Annexures

• Annexure 1: Sieve/Screen Inspection Checklist

• Annexure 2: Sieve/Screen Register Format

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