Floor springs (hydraulically regulated) for heavy doors

IS 6315: Scope - Key Formulas, Tables, and Specifications

Scope covers sampling and conformity criteria for floor springs.

1. Sampling Scale & Criteria (Clause B-1.2)

• Sampling ensures quality control by limiting defects.

2. Manufacturer's Supply Requirements (Clause 15.2)

• Must provide fixing instructions.
• Must supply hydraulic oil needed for installation.

3. Referenced Indian Standards

• IS 226: Structural steel (standard quality)
• IS 210: Grey iron castings
• IS 3098: Hydraulic mineral oil
• IS 4454 (Part 2): Spring steel wires
• Others related to materials and coatings.

This ensures material quality, installation guidance, and sampling-based quality assurance for floor springs under IS 6315.

flowchart TD
    A[Lot Size] --> B[Sample Size]
    B --> C[Check Defective Springs]
    C -->|Within Limit| D[Lot Accepted]
    C -->|Exceeds Limit| E[Lot Rejected]

This diagram shows the sampling and acceptance process.

IS 6315: References - Key Specifications & Tables

1. Referenced Indian Standards (IS)

IS 6315 cites essential IS codes for materials and components used in floor springs:

2. Material Thickness & Grades (Clause 1.25)

• Brass sheet: Min 1.25 mm, Alloy CuZn 40 (IS 410)
• Mild steel sheet: Min 1.25 mm, Fe 410 S (IS 226)
• Aluminium alloy die-casting: Min 2 mm, Grade 4600 M (IS 617)
• Aluminium alloy sheet: Min 1.25 mm, IS 52000 or 65032 W (IS 737)
• Zinc base alloy die-castings: Min 2 mm, ZnA14 (IS 742)
• Stainless steel screws: Grade X 15 Cr 16Ni2 or X07Cr 18Ni9 (IS 6911)

3. Sampling & Quality Control (Clause 1.2, Table 2)

IS 6315: Definitions & Key Specifications

1. Definitions (Clause 3.0)

• The standard applies specific definitions for terms related to floor springs, ensuring uniform understanding.

2. Sampling & Quality Control (Clause 1.2 & 2.1)

• Sampling Table for Floor Springs (Table 2):

• Conformance Criterion (Clause 2.1):
  Lot is accepted if defective count ≤ permissible number in Table 2; otherwise rejected.

3. Manufacturer's Supply (Clause 15.2)

• Must provide:
  • Fixing instructions
  • Hydraulic oil for installation

4. Referenced Indian Standards (Clause 15.2)

• Includes IS 110, IS 210, IS 226, IS 292, IS 410, IS 617, IS 737, IS 742, IS 2933, IS 3098, IS 3618, IS 4454 (Part 2).

flowchart TD
    A[Lot Size] --> B[Sample Size]
    B --> C[Inspect Sample]
    C --> D{Defective Count ≤ Permissible?}
    D -- Yes --> E[Accept Lot]
    D -- No --> F[Reject Lot]

Summary: IS 6315 defines sampling sizes and acceptance criteria for floor springs, ensuring quality control through specified permissible defects and mandatory manufacturer supplies.

IS 6315: Type and Size of Floor Springs (Hydraulically Regulated)

1. Type

• Top Centre Pivot (Clause 3.7): Secures upper door leaf to frame.
• Floor springs are hydraulic, with typical details shown in Fig. 1 (not provided here).

2. Size and Sampling (Clause 1.2 & Table 2)

Sampling for quality control depends on lot size:

3. Material Specifications (Clause 1.25)

• Brass sheet: Min 1.25 mm, CuZn 40 (IS 410:1977)
• Mild steel sheet: Min 1.25 mm, Fe 410 S (IS 226:1975), FG 200 (IS 210:1978)
• Aluminium alloy pressure die-casting: Min 2 mm, 4600 M (IS 617:1975)
• Aluminium alloy sheet: Min 1.25 mm, IS 52000 or 65032 W (IS 737:1986)
• Zinc base alloy die-casting: Min 2 mm, ZnA14 (IS 742:1981)
• Spring tension guard & Governing pivot: Mild steel/cast iron (IS 226, IS 210)

Summary:

• Select floor spring size/type per door weight and pivot type.
• Sampling per Table 2 ensures quality control.
• Materials must meet minimum thickness and IS standards for durability.

flowchart TD
    A[Door Leaf] --> B[Top Centre Pivot]
    B --> C[Floor Spring (Hydraulic)]
    C --> D[Floor]

For detailed dimensions and hydraulic parameters, refer to

IS 6315: Key Material Specifications for Floor Springs

Notes:

• Copper content in brass castings ≥ 60%.
• Castings must be free from blow

IS 6315: Manufacture and Construction - Key Specifications & Materials

1. Manufacturer's Supply (Clause 15.2)

• Fixing instructions for floor spring.
• Hydraulic oil necessary at installation (IS 3098:1983).

2. Material Requirements (Table 1, Clause 5)

IS 6315: Dimensions and Tolerances for Floor Springs

Key Material Thickness & Specifications (Clause 1.25 & Table 1)

Performance Requirement (Clause 9.3)

• Door leaf must open beyond 90° and stay open until pushed back.
• Door swings back automatically if opened less than 90°.

Sampling (Clause 1.2)

IS 6315: Performance Requirements for Floor Springs

Key Performance Criteria (Clause 9.3 & 8.7)

• Door operation: After installation, the door leaf must open beyond 90° and remain open until pushed closed.
• Self-closing: When opened less than 90°, the door shall swing back automatically.
• Door holding: At exactly 90°, the door should stand open without assistance.

Material Specifications (Table 1, Clause 5)

Additional Notes

• Castings must be free from defects.
• Copper content in brass ≥ 60%.
• Hydraulic oil supplied as per IS 3098 at installation.

Summary Diagram: Door Operation States

stateDiagram-v2
    [*] --> Closed
    Closed --> Opened90Plus: Door opened > 90°
    Opened90Plus --> Closed: Pushed to close
    Closed --> OpenedLess90: Door opened < 90°
    OpenedLess90 --> Closed: Auto swing back
    Opened90Plus --> Opened90: Door stands open at 90°

This ensures

IS 6315: Testing - Key Formulas, Tables & Specifications

Rounding Off (IS 2:1960)

• Final test values must be rounded to the same number of significant places as specified in IS 6315.
• Use standard rounding rules per IS 2:1960.

Sampling & Acceptance Criteria

• Lot conformity: The lot is accepted if defective count ≤ permissible number; else rejected.

Summary

• Sample size and defect limits depend on lot size (see table).
• Use these criteria to decide acceptance/rejection of floor springs batch.
• Follow IS 2:1960 for rounding test results.

flowchart TD
    A[Select Lot] --> B[Determine Lot Size]
    B --> C{Lot Size Range}
    C -->|Up to 100| D[Sample 5, Allow 0 Defective]
    C -->|101-150| E[Sample 8, Allow 0 Defective]
    C -->|151-300| F[Sample 13, Allow 0 Defective]
    C -->|301-500| G[Sample 20, Allow 1 Defective]
    C -->|501-1000| H[Sample 32, Allow 2 Defective]
    C -->|1001+| I[Sample 50, Allow 3 Defective]
    D & E & F & G & H & I --> J{Defectives ≤ Allowed?}
    J -->|Yes| K[Accept Lot]
    J -->|No| L[Reject Lot]

This ensures quality control per IS 6315 testing requirements.

Marking Specifications as per IS 6315

• Standard Mark Usage:

  • Governed by the Bureau of Indian Standards Act, 1986.
  • Indicates product conformity under BIS inspection, testing, and quality control.
  • Continuous surveillance by BIS ensures ongoing conformity.

• Manufacturer's Responsibilities:

  • Provide a certificate of compliance to the relevant Indian Standard (Clause 2.2).
  • Mark each floor spring with the Standard Mark (Clause 12.2).

• Packaging Marking Requirements (Clause 12.2):
  Each cardboard box must be marked with:

  • Source of manufacture
  • Quantity in the package
  • Country of origin
  • Year of manufacture
  • Overall dimensions of assembled floor springs

• Rounding Off:

  • Final test values must be rounded off as per IS 2:1960 rules, maintaining the same significant figures as specified.

Summary Table: Packaging Marking Details

This ensures traceability, quality assurance, and compliance with IS 6315.

IS 6315: Surface Treatment Key Points

Clause 11.2: Surface Treatment of Mild Steel Parts

• 11.2.1: Remove all dents, burrs, sharp edges; then pickle, scrub, and rinse to eliminate grease, rust, scale, or foreign matter.
• 11.2.2: After pickling, apply phosphating treatment per IS 3618:1966.
• Follow phosphating with a coat of suitable primer such as red oxide primer.
• Filler application: Use filler conforming to IS 110:1983 on surfaces requiring filling.

Relevant IS Codes for Surface Treatment

Summary of Treatment Procedure

flowchart LR
    A[Remove dents, burrs, sharp edges] --> B[Pickling]
    B --> C[Scrubbing & Rinsing]
    C --> D[Phosphating (IS 3618)]
    D --> E[Apply Red Oxide Primer]
    E --> F[Apply Filler (IS 110) if needed]

Notes:

• Phosphating enhances corrosion resistance and paint adhesion.
• Primer (red oxide) protects the metal before finishing coats.
• Filler smoothens surface irregularities before final paint.

This ensures durable, corrosion-resistant steel components as per IS 6315 requirements.

IS 6315: Packing and Marking of Floor Springs

Packing Specifications (Clause 12.2)

• Each floor spring shall be wrapped in craft paper or polyethylene.
• Packed inside a cardboard box.
• Box must be marked with:
  • Source of manufacture
  • Quantity in package
  • Country of origin
  • Year of manufacture
  • Overall dimensions of assembled floor springs

Marking

• Floor springs may carry the Standard Mark as per BIS regulations, indicating compliance with IS 6315.
• Use of Standard Mark governed by the Bureau of Indian Standards Act, 1986.
• Manufacturer must provide a certificate of compliance for material conformity.

Sampling and Conformity (Annex B & Clause 14)

• Sampling method and criteria for conformity are detailed in Annex B.
• Lot conformity based on permissible number of defectives (see Table B-2 in IS 6315).
• Final test values must be rounded as per IS 2:1960 rules.

Summary Table for Packing Markings

flowchart TD
    A[Floor Spring] --> B[Wrap: Craft Paper/Polyethylene]
    B --> C[Pack in Cardboard Box]
    C --> D[Mark Box with Info]
    D --> E[Source, Quantity, Country, Year, Dimensions]
    E --> F[Standard Mark (optional)]

Note: For detailed sampling and conformity criteria, refer to Annex B of IS 6315.

IS 6315: Instructions for Fixing Floor Springs (Clause 15.2 & Related)

Key Points:

• Manufacturer's Responsibility:
  • Provide detailed fixing instructions with each floor spring.
  • Supply hydraulic oil needed at installation.

Material Specifications (Clause 1.25 & Table 1)

Fixing Instructions Summary:

• Use stainless steel screws for stainless steel covers.
• Ensure pivot alignment (top centre pivot as per Clause 3.7).
• Apply supplied hydraulic oil during installation to regulate door movement.
• Follow dimensional and material specs strictly to ensure durability and performance.

Typical Fixing Steps (General Practice):

flowchart TD
    A[Prepare Floor Opening] --> B[Place Floor Spring Body]
    B --> C[Fix Floor Spring with Screws]
    C --> D[Install Top Centre Pivot]
    D --> E[Attach Door Leaf]
    E --> F[Apply Hydraulic Oil]
    F --> G[Test Door Operation]

Additional Notes:

• Refer to Annex A for Indian Standards for materials and components.
• Floor spring designed for doors ≤ 125 kg per leaf.
• Ensure corrosion protection per IS 3618.

This concise guide ensures compliance with IS 6315 fixing requirements

IS 6315: Sampling and Criteria for Conformity (Annex B)

Key Points:

• Lot Conformity:
  A lot is accepted if the number of defective floor springs in the sample ≤ permissible number in Table 2.

• Sample Size & Permissible Defectives (Table 2):

Sampling Procedure:

• Select sample size based on lot size.
• Inspect all sampled floor springs.
• If defective count ≤ permissible number, lot conforms.
• Else, lot does not conform.

Packaging & Marking (Clause 12.2):

• Each floor spring packed in craft paper/polyethylene inside a cardboard box.
• Box marked with:
  • Manufacturer source
  • Quantity
  • Country of origin
  • Year of manufacture
  • Overall dimensions

flowchart TD
    A[Start: Lot of Floor Springs] --> B[Determine Lot Size]
    B --> C{Select Sample Size from Table 2}
    C --> D[Inspect Sample]
    D --> E{Number of Defectives ≤ Permissible?}
    E -->|Yes| F[Accept Lot]
    E -->|No| G[Reject Lot]

This ensures quality control by statistically verifying lot conformity per IS 6315.

IS 6315 - Guarantee & Quality Compliance Summary

Guarantee Requirements (Clause 15.2)

• Manufacturer must supply with each floor spring:
  • Fixing instructions
  • Hydraulic oil for installation

Sampling & Acceptance Criteria (Clause B-1.2 & 2.1)

• Sample size and permissible defective units depend on lot size:

• If defects exceed permissible number, lot fails.

Referenced IS Standards for Materials & Components

• IS 226 (Structural steel)
• IS 210 (Grey iron castings)
• IS 3098 (Hydraulic oil)
• IS 737 (Aluminium alloys)
• IS 4454 (Spring steel wires)
• Others for brass, enamel, corrosion protection

Summary Diagram: Sampling & Guarantee Process

flowchart TD
    A[Manufacturer] --> B[Supply floor spring]
    B --> C{Include fixing instructions?}
    B --> D{Include hydraulic oil?}
    C -->|Yes| E[Complete package]
    D -->|Yes| E
    E --> F[Sampling per Table 2]
    F --> G{Defective units ≤ permissible?}
    G -->|Yes| H[Lot accepted]
    G -->|No| I[Lot rejected]

Key takeaway: Guarantee compliance includes proper documentation, supply of hydraulic oil, and strict sampling with zero or minimal defects allowed per lot size.