Gas holder seal

Overview
Industrial diaphragms for gas holders, steam accumulators and sewer gas tanks, manufactured to customer specifications. Available in large dimensions and produced by hot vulcanization to meet application-specific requirements.

Gas Holder Diaphragms — Application & Properties
Designed for Wiggins-type gas holders in steelworks and similar industrial plants to provide a gas-tight seal between the holder wall and piston throughout movement.

• Thickness: 2.2 mm — extremely low gas permeability
• Operating temperature: -40°C to +80°C
• Reinforcement: multi-axial polyamide layer for flexibility and high tensile strength
• Durability: >200,000 strokes; service life >10 years (application dependent)

Specifications (general)

• Manufacturing method: hot vulcanization
• Height range: 2.50–22 m
• Diameter range: 6–60 m
• Gas volume range: 500–100,000 m3
• Extremely high seam strength
• Coating selection based on media and application

Material (gas holder)
Multi-axial fabric coated on both sides with nitrile rubber.

• Weft angles of diagonal threads can be specified
• Absorbs forces from multiple directions
• Full tensile load carried in each yarn
• Warp, weft and angle adjustable to application

Steam Accumulator Diaphragms — Application & Properties
Used in steam collection and recirculation systems (e.g., mineral oil industry) to reduce emissions and improve energy recovery.

• Low permeation and resistance to commercial fuels
• High tensile strength; temperature resistance up to +70°C
• Extremely high seam strength (tested by certified agencies) under fuel exposure

Material (steam accumulator)
Ultra-strong, low-stretch polyamide fabric coated both sides with nitrile-base rubber; fabric construction resistant to hydrolysis.

Sewer Gas Diaphragms — Application & Properties
For temporary storage of fermentation gas/biogas to be used for heat recovery or steam generation.

• High tensile strength, high flexibility and strong media resistance
• Operating temperature: -25°C to +70°C
• Highly impermeable to gases
• No weak seam points when exposed to condensate (vs cold-bonded diaphragms)
• Service life: typically >100,000 strokes

Material (sewer gas)
Reinforcement from high-strength, low-stretch polyamide or polyester fabric; fabric coated both sides with chloroprene-base rubber.

Diaphragms for Various Types of Gas and Steam
Custom solutions are developed from a broad selection of elastomer compounds and fabrics to meet chemical resistance, temperature and pressure requirements for specific media and future applications.

Technical specifications

• Manufacturing: hot vulcanization
• Typical thickness (gas holder): 2.2 mm
• Height range: 2.50–22 m
• Diameter range: 6–60 m
• Gas volume range: 500–100,000 m3
• Operating temperatures: gas holders -40°C to +80°C; steam accumulators up to +70°C; sewer gas -25°C to +70°C
• Service life: >10 years (gas holder); >100,000 strokes (sewer gas); >200,000 strokes indicated for some types
• Extremely high seam strength (fuel exposure tested)
• Reinforcements: multi-axial polyamide, ultra-strong low-stretch polyamide fabric, or polyester fabric
• Coatings: nitrile rubber (both sides) or chloroprene rubber (both sides) depending on application
• Design options: adjustable warp/weft/angle; specified weft angles; absorption of forces from all directions
• Function: maintains tight seal between gas-holder wall and piston in all movement states