Specification for Suction Strainers, Cylindrical Type For Fire Fighting Purposes

IS 907 - Scope: Key Specifications & Tables

Scope Overview:

• Applies to suction strainers and related components.
• Materials per Clauses 2.1.1 & 2.1.2 (e.g., leaded tin bronze, high tensile brass).
• All parts must have good workmanship, burrs/sharp edges removed, and smooth waterway finish (Clause 5.1).
• Marking includes ISI Certification Mark (Clause 6.1.1).

Important Specifications & Rules

Common Units & Definitions (SI Units)

Example: Hose Connection Details (per IS 902)

• 4 Nos. Copper Rivets, 5 mm diameter, equally spaced.
• Dimensions in millimeters.
• Cylindrical type suction strainer detail shown in Fig. 1 (not included here).

flowchart LR
    A[Material Selection] --> B[Manufacturing]
    B --> C[Workmanship & Finish]
    C --> D[Marking & Certification]
    D --> E[Testing & Compliance]

Summary: IS 907 covers materials, workmanship, marking, and

IS 907 References: Key Points & Specifications

• Rounding Off (Clause 0.3):
  Numerical values must be rounded per IS 2:1960, retaining the same significant figures as specified.

• Marking (Clause 6.1.1):
  Suction strainers may carry the ISI Certification Mark, ensuring compliance with ISI quality and inspection protocols.

• Materials for Base (Clause 2.1):
  Base materials are specified in Clauses 2.1.1 and 2.1.2 (refer IS 907 for details).

• International System of Units (SI Units):
  IS 907 uses SI units as standard, including:

  Quantity	Unit	Symbol	Definition
  Length	metre	m
  Mass	kilogram	kg
  Time	second	s
  Force	newton	N	1 N = 1 kg·m/s²
  Pressure, stress	pascal	Pa	1 Pa = 1 N/m²
  Energy	joule	J	1 J = 1 N·m

• Contact & Offices:
  ISI headquarters and regional offices are listed for certification queries.

Summary Table: Rounding Off (IS 2:1960)

flowchart TD
    A[Test/Calculation Result] --> B{Number of Significant Figures?}
    B -->|Match Standard| C[Round off value accordingly]
    C --> D[Final Value]

For detailed materials and marking requirements, refer to IS 907 Clauses 2.1 and 6.1.1 respectively.

IS 907: Shape and Dimensions Key Points

• Nominal Sizes Covered: 75, 100, 125, and 140 mm (Clause 3.1)
• Dimension Limits:

• Strainer Area Requirement:
  Total strainer area ≥ 5.75 × cross-sectional throat area

• Tolerance:
  Machined dimensions tolerance as per medium grade of IS 2102 (Part 1)-1980ft (Clause 4.1)

• Washer:
  Shall conform to IS 937-1981 (Clause 2.3)

Formula for Strainer Area

[ A_{strainer} \geq 5.75 \times A_{throat} ]

Where:

• ( A_{throat} = \pi \times \left(\frac{G}{2}\right)^2 )

Visual Summary (Mermaid Diagram)

graph TD
  A[Nominal Size] --> B[Length (L) Max]
  A --> C[Internal Diameter (G) Max]
  A --> D[Strainer Area ≥ 5.75 × Throat Area]
  B --> E[250, 350, 400, 500 mm]
  C --> F[110, 140, 165, 180 mm]

Note: Refer to Fig. 1 of IS 907 for detailed shape geometry.

IS 907: Materials - Key Formulas, Tables, and Specifications

1. Materials for Base (Clause 2.1)

• Copper Alloys as per:
  • Sand Castings: Grade LTB 2 (IS 318-1981) or Grade LTB 3 (IS 304-1981)
  • Die Castings: Grade 3 (IS 292-1961)
  • Hot Forgings: Grade 1 (IS 291-1977)

2. Rounding Off Numerical Values (Clause 0.3)

• Follow IS 2-1960 for rounding.
• Retain the same number of significant places as the specified value.

3. Tolerance on Machined Dimensions (Clause 4.1)

• Use Medium Grade Tolerances as per IS 2102 (Part 1)-1980.

Summary Table: Copper Alloy Grades

Additional Notes:

• Workmanship and finish must comply with IS 907 Clause 5.
• Ensure all materials conform to specified IS grades for durability and performance.

flowchart TD
    A[Base Material Selection] --> B{Process Type}
    B -->|Sand Casting| C[Grade LTB 2 / LTB 3]
    B -->|Die Casting| D[Grade 3]
    B -->|Hot Forging| E[Grade 1]
    F[Rounding Off] --> G[IS 2-1960]
    H[Tolerance] --> I[IS 2102 (Part 1)-1980 Medium Grade]

This concise guide ensures compliance with IS 907 material specifications and quality control.

Workmanship and Finish per IS 907

• Clause 5.1:

  • All parts must exhibit good workmanship and finish.
  • Remove all burrs and sharp edges to prevent injury and ensure proper assembly.
  • The water way surfaces shall be smooth, ensuring no flow obstruction or corrosion initiation points.

• Tolerances:

  • Machined dimensions must conform to medium grade tolerance as per IS 2102 (Part 1)-1980.
  • General dimensional and angular tolerances follow IS 2102 Part 1 (second revision).

• Material Specifications:

  • Use leaded tin bronze, high tensile brass, naval brass, cold rolled brass, and copper per their respective IS specifications for ingots, castings, rods, sheets, and washers.

• Rounding off:

  • Final test values must be rounded as per IS 2-1960, keeping the same significant figures as specified.

Summary Table: Key Specs for Workmanship and Finish

flowchart TD
    A[Raw Material] --> B[Machining]
    B --> C{Check Tolerances}
    C -- Within Medium Grade --> D[Remove Burrs & Sharp Edges]
    C -- Outside Tolerance --> E[Rework]
    D --> F[Smooth Finish on Water Way]
    F --> G[Final Inspection & Rounding Off]

This ensures compliance with IS 907 workmanship and finish requirements.

IS 907 - Marking (Clause 6.1.1)

• Marking Requirement:
  The suction strainer may be marked with the ISI Certification Mark.

• ISI Mark Significance:

  • Indicates compliance with IS 907 under ISI's inspection, testing, and quality control system.
  • ISI marked products are subject to continuous conformity checks by ISI.
  • Use of ISI mark governed by Indian Standards Institution (Certification Marks) Act.

• Rounding Off (Clause None: 0.3):
  Final test or analysis values must be rounded as per IS 2:1960 rules, retaining the same significant figures as specified.

Relevant Standards for Marking & Dimensions

Summary Table: ISI Marking

If you need details on marking location, size, or specific labeling format, refer to the manufacturer's ISI license conditions or ISI guidelines.

flowchart TD
    A[Manufacture Suction Strainer] --> B[Apply ISI Mark]
    B --> C{Complies with IS 907?}
    C -- Yes --> D[Product Certified]
    C -- No --> E[No ISI Mark Allowed]
    D --> F[Continuous ISI Surveillance]

Note: Marking ensures traceability and quality assurance per IS 907.

IS 907 - Testing and Quality Control: Key Points

1. Rounding Off Test Results (Clause 0.3)

• Final test/analysis values should be rounded as per IS 2-1960.
• Retain the same number of significant figures as specified in the standard.

2. Quality Assurance (Clause 6.1.1)

• Products may bear the ISI Certification Mark, indicating compliance with IS 907 under strict inspection and testing.
• ISI Mark ensures continuous surveillance and conformity to standards.

3. Units and Measurements

• Use SI Units as per IS 907:

  Quantity	Unit	Symbol	Definition
  Length	metre	m
  Mass	kilogram	kg
  Time	second	s
  Force	newton	N	1 N = 1 kg·m/s²
  Pressure, Stress	pascal	Pa	1 Pa = 1 N/m²

4. Testing and Inspection

• Testing should be performed under controlled conditions with calibrated equipment.
• Results must be documented and compared against specified limits.

Summary Table: Rounding Off Rules (IS 2-1960)

flowchart TD
    A[Raw Material] --> B[Inspection & Testing]
    B --> C{Pass Quality?}
    C -- Yes --> D[ISI Marking & Certification]
    C -- No --> E[Rejection / Rework]
    D --> F[Dispatch]

Note: For detailed test procedures and acceptance criteria, refer to the full IS 907 document and related IS codes for testing methods.

IS 907: Installation Guidelines - Key Points & Specifications

1. Marking & Certification (Clause 6.1.1)

• Suction strainers may bear the ISI Certification Mark.
• ISI mark ensures compliance with quality, inspection, and testing standards.
• Usage governed by Indian Standards Institution Certification Marks Act.

2. Material Specifications (Clause 2.1)

• Base materials for components as per sub-clauses 2.1.1 & 2.1.2.
• Common materials include leaded tin bronze, high tensile brass, naval brass, and copper (refer to respective IS specifications).

3. Workmanship & Finish (Clause 5.1)

• All parts must have good workmanship.
• Burrs and sharp edges must be removed.
• Waterways should have a smooth finish to avoid flow disturbances.

4. Dimensional Tolerances

• Follow IS:2-1960 for rounding off numerical values.
• Allowable deviations per IS tolerances standards for linear/angular dimensions.

5. Installation Detail Example (Fig.1)

• Suction strainer fitted with 4 copper rivets (5 mm diameter) equally spaced.
• Dimensions are in millimeters.

Summary Table: Key Installation Checks

flowchart TD
    A[Start Installation] --> B[Check ISI Mark]
    B --> C{Material as per IS 907?}
    C -->|Yes| D[Ensure Burrs Removed]
    C -->|No| E[Replace with IS Spec Material]
    D --> F[Check Rivet Size & Spacing]
    F --> G[Confirm Smooth Waterway]
    G --> H[Complete Installation]

For detailed material specs, refer to IS 1570 (bronze), IS 319 (brass), and IS

IS 907: Safety Requirements - Key Points & Specifications

1. Rounding Off Values (Clause 0.3):

• Final test or analysis values must be rounded as per IS 2-1960.
• Retain the same number of significant digits as the specified value.

2. Marking (Clause 6.1.1):

• Suction strainers may bear the ISI Certification Mark, ensuring compliance with IS standards under strict quality control and continuous inspection.

3. Units & Symbols:
IS 907 adopts the International System of Units (SI Units), critical for safety calculations and specifications:

4. Material Base (Clause 2.1):

• Bases of components must be made from materials specified in Clauses 2.1.1 & 2.1.2 (details not provided here).

Summary Diagram: Safety Compliance Flow

flowchart TD
    A[Test/Analysis Result] --> B[Rounding as per IS 2-1960]
    B --> C[Compare with Specified Value]
    C --> D{Complies?}
    D -- Yes --> E[Mark with ISI Certification]
    D -- No --> F[Reject/Revise]

Note: For detailed safety factors, material specs, and testing procedures, refer directly to IS 907 clauses and IS 2-1960 for rounding rules.