INDUSTRY COMPONENT

Diaphragm/Air Bag

Flexible membrane in conservator tanks that separates transformer oil from air to prevent oxidation and moisture absorption.

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Component Specifications

Definition
A diaphragm or air bag is a flexible, impermeable membrane installed within conservator tanks of oil-filled transformers. It creates a physical barrier between the insulating oil and atmospheric air, allowing for thermal expansion and contraction of the oil while preventing direct contact with oxygen and moisture. This component maintains oil quality by eliminating oxidation, reducing sludge formation, and minimizing dielectric breakdown risks.
Working Principle
The diaphragm operates on the principle of flexible separation. As transformer oil heats up during operation, it expands into the conservator tank, compressing the air bag. During cooling, the oil contracts, and the diaphragm expands to maintain positive pressure, preventing air ingress. This dynamic movement accommodates volume changes while keeping the oil isolated from atmospheric contaminants.
Materials
Typically made from nitrile rubber (NBR), ethylene propylene diene monomer (EPDM), or fluorocarbon elastomers (FKM) for chemical resistance. Reinforcement layers often include nylon or polyester fabric. Material selection depends on oil compatibility, temperature range (-40°C to +100°C), and UV resistance requirements.
Technical Parameters
  • Diameter 300-2000 mm
  • Thickness 2-5 mm
  • Permeability <0.1 g/m²/day
  • Volume Capacity 5-500 liters
  • Temperature Range -40°C to +100°C
  • Operating Pressure 0-0.5 bar
Standards
ISO 4633, DIN 53504, ASTM D2000

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Diaphragm/Air Bag.

transformer diaphragm conservator tank air bag oil expansion membrane flexible separator transformer maintenance nitrile rubber diaphragm Diaphragm/Air Bag Diaphragm/Air Bag in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Conservator Tank (Expansion Tank)

A sealed tank connected to a power transformer's main tank that accommodates the thermal expansion and contraction of insulating oil.

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Engineering Analysis

Risks & Mitigation
  • Material degradation leading to oil contamination
  • Rupture causing air ingress and transformer failure
  • Improper installation resulting in leaks
  • UV exposure reducing lifespan
FMEA Triads
Trigger: Material aging from prolonged UV exposure
Failure: Cracking and loss of impermeability
Mitigation: Use UV-resistant materials and install protective covers
Trigger: Chemical incompatibility with transformer oil additives
Failure: Swelling or hardening of diaphragm
Mitigation: Verify material compatibility through ASTM testing
Trigger: Overpressure from blocked breather vents
Failure: Rupture and sudden air ingress
Mitigation: Install pressure relief valves and regular vent maintenance

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±2% on dimensional specifications, leak-tight at 0.7 bar test pressure
Test Method
Pressure decay test per ISO 4633, material compatibility per ASTM D471

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

How often should a diaphragm be replaced?

Typically every 10-15 years, but inspect annually for cracks, hardening, or permeability issues.

Can diaphragms be repaired?

No, damaged diaphragms must be replaced entirely to maintain seal integrity.

What causes diaphragm failure?

Common causes include material degradation from UV exposure, chemical incompatibility, mechanical fatigue from frequent cycling, or improper installation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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