Door Closers, Concealed Type (Hydraulically Regulated)

IS 14912: Scope - Key Formulas, Tables, and Specifications

1. Scope (Clause 13.3.1)

• Covers Construction, Finish, Dimensions, Interchangeability of Parts, and Performance Tests for concealed hydraulic door closers.

2. Nominal Sizes (Clause 5, Table 1)

3. Materials (Table 2)

• Specifies materials for main components (not detailed here, refer to IS 14912 Table 2 for specifics).

4. Sample Size & Acceptance Criteria for Tests (Clause 13.2.1, Table 3)

5. Definitions (Clause 3.0)

• Universal Closer: Suitable for both clockwise and anti-clockwise doors

IS 14912: Normative References - Key Points

1. Sample Size & Acceptance Criteria (Table 3, Clause 13.2.1)

• Two-stage sampling applies, with second sample sizes equal to the first.
• Acceptance/rejection numbers increase with lot size.

2. Normative Indian Standards Referenced (Annex A)

IS 14912 Definitions & Key Specifications Summary

1. Definitions (Clause 3.0)

• Universal Closer (3.6): A door closer operable on both anti-clockwise and clockwise doors without changing parts.

2. Nominal Sizes (Clause 5, Table 1)

3. Materials (Table 2)

• Specifies materials for main components (not detailed here but includes metals and finishes suitable for durability).

4. Sampling for Quality Tests (Clause 13.2.1, Table 3)

• Defines sample size, acceptance, and rejection criteria based on lot size for construction, finish, dimensions, interchangeability, and performance tests.

Visual: Door Closer Components (Fig. 1 & 2)

• Illustrates concealed hydraulic door closer parts (arm, body, spring, hydraulic mechanism).

Important Notes:

• Use Table 1 for selecting closer size based on door weight & width.
• Refer to Table 3 for quality control sampling during production.
• Universal closers simplify installation by fitting either hand of door without modification.

flowchart LR
    A[Door Mass & Width] --> B{Select Closer Size}
    B -->|Up to 60 kg & ≤ 850 mm| C[No. 1 Closer]
    B -->|61-80 kg & 851-1000 mm| D[No. 2 Closer]
    C & D --> E[Install Universal Closer]

For detailed material specs and test procedures, consult full IS 14912 text.

IS 14912 - Nominal Sizes of Door Closers

Key Specifications (Clause 5, Table 1):

• Door closers are manufactured in two nominal sizes based on door mass and width.
• Size No. 1 is for lighter and narrower doors; Size No. 2 for heavier and wider doors.

Additional Notes:

• Door closer size selection ensures proper closing force and durability.
• Materials for main components are specified in Table 2 (not detailed here).
• Closer must be suitable for both clockwise and anti-clockwise doors (Clause 3.6).

Summary Diagram of Size Selection:

flowchart TD
    A[Door Mass & Width] --> B{Mass ≤ 60 kg?}
    B -- Yes --> C[Size No. 1]
    B -- No --> D{Mass ≤ 80 kg?}
    D -- Yes --> E[Size No. 2]
    D -- No --> F[Use heavier duty closer (not in IS 14912)]
    
    C --> G[Width ≤ 850 mm]
    E --> H[Width 851 to 1000 mm]

Practical Tip:

• Always verify door mass and width before selecting closer size to ensure compliance and performance.

IS 14912: Materials - Key Specifications & Tables

1. Materials for Door Closers (Table 2, Clause 5)

• Specifies materials for main components (not detailed here, refer IS 14912 Table 2).
• Materials include:
  • Aluminium alloys for castings and sheets
  • Steel (carbon, cold-rolled strips for springs)
  • Brass and zinc alloys for die castings
  • Paints and coatings conforming to IS standards (e.g., IS 110 for paints, IS 1868 for anodic coatings)

2. Sample Size & Conformity Criteria (Table 3.3.2, Clause 13.2.1)

• Used for construction, finish, dimensions, interchangeability, and performance tests.

3. Referenced IS Standards for Materials

• IS 110: Ready mixed paint for enamels
• IS 210: Grey iron castings
• IS 292: Leaded brass ingots
• IS 2507: Cold rolled steel strips for springs

IS 14912: Essential Requirements for Door Closers

1. Nominal Sizes (Clause 5, Table 1)

2. Materials (Clause 5, Table 2)

• Specifies materials for main components (not detailed here; refer to IS 14912 Table 2).

3. Sample Size & Conformity Criteria (Clause 13.2.1, Table 3)

• Sampling plan based on lot size with acceptance and rejection numbers.
• Example for lot size up to 50:
  • First sample: 8 units, acceptance = 0, rejection = 2
  • Second sample: 8 units, acceptance = 1, rejection = 2

4. Tests (Annex B, Clause 13.3)

• Construction, finish, dimensions, interchangeability, and performance tests as per Clause 13.3.
• Endurance tests per Clause 13.2.1.

Summary Diagram: Door Closer Selection Flow

flowchart TD
    A[Determine Door Mass & Width] --> B{Select Nominal Size}
    B -->|Up to 60 kg & ≤ 850 mm| C[Use Designation No.1]
    B -->|61-80 kg & 851-1000 mm| D[Use Designation No.2]
    C & D --> E[Material Selection per Table 2]
    E --> F[Perform Tests per Clause 13.3]
    F --> G[Sampling & Conformity Check per Table 3]

Key Points:

• Use Table 1 for closer sizing.
• Follow Table 3 for quality control sampling.
• Refer to Annex B for testing procedures.
• Materials and detailed specs in Table 2 and IS references.

For full details, consult IS 14912 clauses 3.6, 5, 7, 13.2.1, 13.3, Annex A & B.

IS 14912: Surface Treatment and Finish – Key Points

1. Surface Preparation (Clause 8.2 & 8.2.1)

• Remove all dents, burrs, sharp edges.
• Components must be pickled, scrubbed, rinsed to eliminate grease, rust, scale, and foreign elements.

2. Treatment for Mild Steel Parts

• Follow the above surface preparation steps.
• Apply phosphate treatment as per IS 3618:1966 for corrosion protection.

3. Paint and Coatings

• Use ready-mixed paint or grey filler compliant with IS 110:1983 for enamels over primers.
• For aluminium parts, anodic coatings per IS 1868:1996 and IS 1875:1992.

4. Sampling & Quality Control (Table 3 - Clause 13.2.1)

• Sample sizes and acceptance criteria depend on lot size.
• Example for lot size up to 50 door closers:
  • First sample: 8 units; acceptance number = 0; rejection number = 2.
  • Second sample: 8 units; acceptance number = 1; rejection number = 2.

5. References for Surface Treatment Standards

• IS 3618: Phosphate treatment for corrosion resistance.
• IS 110: Paint specifications.
• IS 1868/1875: Anodic coatings on aluminium.

flowchart LR
    A[Remove burrs, dents, sharp edges] --> B[Pickling, scrubbing, rinsing]
    B --> C{Material Type}
    C -->|Mild Steel| D[Phosphate Treatment (IS 3618)]
    C -->|Aluminium| E[Anodic Coating (IS 1868/1875)]
    D --> F[Paint Application (IS 110)]
    E --> F

Summary: Proper

IS 14912 — Tests on Door Closers: Key Specifications and Tables

1. Sample Size & Acceptance Criteria (Clause 13.2.1, Table 3)

2. Conditioning & Performance Test (Clause 7.3.1)

• Condition closers at 50°C ± 2°C and -10°C ± 2°C for ≥ 3 hours separately.
• Test performance within 15 minutes after conditioning.
• No defects or oil leakage allowed post-test.

3. Materials for Hydraulic Concealed Door Closers (Table 2)

IS 14912: Key Marking Specifications & Sampling Table

Marking Requirements (Clause 10.1)

Each door closer must be clearly marked with:

• Manufacturer's name or trade-mark
• Type of closer: Right (R), Left (L), or Universal (U)
• Size of the closer
• Type of the closer
• Serial number

Rounding Off (IS 2:1960)

• Final test values must be rounded off as per IS 2 rules.
• Retain the same number of significant figures as specified in the standard.

Sampling & Conformity (Table 3, Clause 13.2.1)

Second sample sizes and acceptance/rejection numbers increase cumulatively.

Summary Diagram: Marking Info on Door Closer

graph TD
    A[Door Closer] --> B[Manufacturer's Name/Trade-mark]
    A --> C[Closer Type (R/L/U)]
    A --> D[Size]
    A --> E[Type]
    A --> F[Serial Number]

Note: For licensing to use the Standard Mark, refer to the Bureau of Indian Standards as per Clause 10.2.1.

IS 14912 - Packing Specifications for Door Closers

Key Packing Requirements (Clause 11.1)

• Individual packing: Each door closer must be packed in a cardboard or wooden box.
• Protection: Use reinforcing boards or straw inside the box to:
  • Prevent damage to the painting.
  • Avoid ingress of moisture during storage.
• Quality: Packing materials must be of such quality that they ensure moisture-proof storage.

Inspection (Clause 1.2)

• Packing shall be visually inspected for conformity to the above criteria.

Rounding Off (Clause None)

• Test results related to packing and performance should be rounded as per IS 2:1960:
  • Retain the same number of significant digits as specified values.

Summary Table for Packing

This ensures safe storage and transport without damage or corrosion.

IS 14912: Accessories for Door Closers - Key Points

• Clause 11.2:
  Each door closer must be supplied with:

  • A list of accessories (as per Clause 12).
  • Installation, usage, and maintenance instructions.
  • One fitting key or suitable spanner for adjusting the speed regulating screw.

• Nominal Sizes (Clause 5, Table 1):
  Door closers are designated by door mass and width:

  Designation	Mass of Door	Width of Door
  No. 1	Up to 60 kg	Up to 850 mm
  No. 2	61 to 80 kg	851 to 1,000 mm

• Materials (Table 2):
  Specifies materials for main components (hydraulic parts, springs, casing) ensuring durability and corrosion resistance.

• Sampling & Conformity (Clause 13, Table 3):
  Sampling sizes and acceptance criteria for quality control are defined based on lot size.

Summary of Accessories Requirements:

• Fitting Key/Spanner: For speed adjustment.
• Installation Leaflet: Clear instructions for installers and users.
• Accessory List: Must accompany each closer.

Typical Door Closer Components (Fig. 1 & 2 reference):

graph LR
A[Main Body] --> B[Hydraulic Cylinder]
A --> C[Spring]
A --> D[Arm]
A --> E[Speed Regulating Screw]

Note: Refer to IS 14912 Clause 12 for detailed accessory list and Annex B for testing procedures ensuring accessory quality and performance.

IS 14912: Sampling and Criteria for Conformity (Clause 13.3 & Table 3)

Key Points:

• Sampling is done in two stages: First sample, then if necessary, a second sample of equal size.
• Defective door closers are counted in each sample.
• Acceptance/Rejection criteria depend on the lot size and cumulative defectives.

Sampling Table Summary (Table 3):

Procedure:

1. Inspect/test first sample.
2. If defectives ≤ acceptance number → Lot accepted.
3. If defectives ≥ rejection number → Lot rejected.
4. If acceptance < defectives < rejection → Test second sample.
5. Combine defectives from both samples:
   • If combined defectives ≤ cumulative acceptance → Lot accepted.
   • Else → Lot rejected.

Notes:

• Defectives include failures in construction, finish, dimensions, interchangeability, and performance.
• Rounding off test results per IS 2:1960.

flowchart TD
    A[Start: Inspect First Sample] --> B{Defectives ≤ Acceptance?}
    B -- Yes

IS 14912: List of Referenced Indian Standards (Annex A)

This Annex provides key Indian Standards referenced in IS 14912 for materials and processes related to door closers:

Sampling Table for Door Closers (Clause 13.2.1, Table 3)

IS 14912: Details of Tests - Key Points & Tables

1. Sample Size & Acceptance Criteria (Clause 13.2.1, Table 3):
For testing door closers, the sample size and acceptance/rejection numbers depend on the lot size.

2. Tests Covered (Clause 13.3.1):

• Construction
• Finish
• Dimensions
• Interchangeability of Parts
• Performance Tests

3. Rounding Off (IS 2:1960):
Final test values must be rounded off to the same significant figures as specified in the standard.

Summary Diagram of Testing Process

flowchart TD
    A[Start: Lot of Door Closers] --> B{Lot

IS 14912 - Committee Composition Overview

• The technical committee composition for IS 14912 is detailed in Annex C of the standard.
• The committee is formed under the Builders Hardware Sectional Committee, CED 15.
• The committee typically includes:
  • Experts from government organizations
  • Representatives from industry/manufacturers
  • Academicians and research institutions
  • Consumer and user group members
  • Testing and certification agencies

Key Points:

Note: For exact member names and affiliations, refer to Annex C of IS 14912.

If you need details on sample selection (Clause 13.2) or test criteria (Clause 13.3), please specify!