Editorial Technical Reference

Holder/Flange Assembly

This page explains how Holder/Flange Assembly is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A mechanical assembly that secures and seals a rupture disc within a pressure system.

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Product Specifications

Technical details and manufacturing context for Holder/Flange Assembly

Definition
The Holder/Flange Assembly is a critical component of a rupture disc system that provides the structural interface between the rupture disc and the pressure vessel or piping. It consists of a holder that clamps the rupture disc in place and a flange that allows for bolted connection to the system, ensuring proper alignment, sealing, and pressure containment until the disc ruptures at its set pressure. The assembly is available in carbon steel or stainless steel, with material grades such as SS304/SS316L for corrosion resistance. It is designed for nominal diameters from DN15 to DN600, operating pressures from 1.0 to 1.6 MPa, and temperatures from -40°C to 85°C, depending on seal material. The flange rating ranges from PN16 to PN40, and the assembly weight varies from 2 to 50 kg. Key parameters include seat flatness of 0.05 mm, surface roughness of Ra 0.8–1.6 µm, and bolt torque of 50–200 N·m. Seal types include O-ring or flat. These values are directory reference ranges and must be confirmed for the specific model and application. The assembly complies with standards such as ISO 7005 for flanges, ISO 1302 for surface texture, ISO 898 for bolt properties, and ASTM A240 for stainless steel plates. Always verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The assembly mechanically clamps the rupture disc between its holder and flange surfaces using bolts. This creates a pressure-tight seal. The design ensures the disc is held securely without distorting it, allowing it to burst predictably at its rated pressure. The flange facilitates standard connection to adjacent piping. The holder and flange are machined to precise flatness and surface roughness to ensure even gasket seating and leak-tightness. Bolt torque is applied within the specified range to achieve the required clamping force without over-stressing the disc. The assembly operates within the pressure and temperature limits defined by the seal material and flange rating. If the disc ruptures, the assembly contains the pressure release and directs the flow. Regular inspection of the seal and bolt torque is necessary to maintain performance.
Common Materials
Carbon Steel, Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal DiameterDN15–DN600 mmMatches rupture disc sizeISO 7005
Operating Pressure1.0–1.6 MPaBelow 1.0 MPa seat load insufficientISO 5208
Operating Temperature-40–85 °CSeal material limits range
Seat Flatness0.05 mmEnsures leak-tight sealISO 5208
Surface RoughnessRa 0.8–1.6 µmCritical for gasket seatingISO 1302
Bolt Torque50–200 N·mPer bolt size and classISO 898
Material GradeSS304/SS316LCorrosion resistanceASTM A240
Weight2–50 kgDepends on size and rating
Flange RatingPN16–PN40 barMatches system pressureISO 7005
Seal TypeO-ring/FlatO-ring for low torque

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Top Flange Part
    Upper clamping surface; connects to inlet piping.
    Material: Carbon Steel or Stainless Steel
  • Bottom Flange Part
    Lower clamping surface; connects to outlet piping or vessel.
    Material: Carbon Steel or Stainless Steel
  • Holder Ring Part
    Central ring that positions and clamps the rupture disc.
    Material: Carbon Steel or Stainless Steel
  • Stud Bolts Part
    Fasteners that apply clamping force to seal the assembly.
    Material: Alloy Steel
  • Gaskets Part
    Provide sealing between flanges and the rupture disc.
    Material: Graphite, PTFE, or Metal

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10,000 psi (689 bar)
other spec: Slurry concentration: ≤40% solids by weight, Flow rate: Dependent on flange size and system design
temperature: -20°C to 400°C
Media Compatibility
✓ Natural gas pipelines ✓ Chemical processing fluids ✓ High-purity water systems
Unsuitable: Hydrofluoric acid environments
Sizing Data Required
  • Maximum operating pressure (MOP)
  • Flange size and rating (e.g., ANSI 150, 300)
  • Rupture disc diameter and type

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Bolt fatigue and loosening
Cause: Cyclic loading from vibration or thermal expansion causing stress concentration at bolt threads, leading to crack initiation and propagation
Gasket compression failure
Cause: Inadequate bolt torque during installation or relaxation over time, resulting in insufficient sealing pressure and fluid leakage
Maintenance Indicators
  • Visible fluid leakage or weeping at flange interface
  • Audible hissing or whistling indicating pressure loss through compromised seal
Engineering Tips
  • Implement controlled bolt tightening sequence using calibrated torque wrenches to ensure uniform gasket compression
  • Establish regular torque verification schedule and thermal cycle monitoring to detect bolt relaxation before failure occurs

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ANSI B16.5 - Pipe Flanges and Flanged Fittings DIN 2501 - Flanges; General

Quoted from the published standard.

Manufacturing Precision
  • Bore Diameter: +/-0.025mm
  • Flange Flatness: 0.05mm per 100mm diameter
Quality Inspection
  • Dimensional Verification with CMM
  • Magnetic Particle Inspection for Surface Defects
Technical documentation
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Inspection readiness
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Manufacturers of Holder/Flange Assembly

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Frequently Asked Questions

What is the function of a Holder/Flange Assembly?

It holds and seals a rupture disc in a pressure system, providing a bolted connection to piping or vessels. It ensures the disc is clamped securely without distortion, allowing it to burst at its set pressure.

What materials are available for this assembly?

The assembly is available in carbon steel or stainless steel, with material grades such as SS304/SS316L for corrosion resistance. The specific grade should be confirmed based on the application.

What are the typical size and pressure ranges?

Nominal diameters range from DN15 to DN600, and flange ratings from PN16 to PN40. Operating pressure is typically 1.0 to 1.6 MPa. These are reference ranges; verify for the specific model.

How should I verify the assembly's specifications?

Always check the model-specific values for dimensions, pressure, temperature, and materials with the legal manufacturer or supplier. Standards like ISO 7005 are references for procurement and verification.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Rupture Disc
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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