Company Overview
STENFLEX Rudolf Stender GmbH specializes in flexible pipe connections, offering products such as rubber and steel expansion joints, PTFE expansion joints, pipe connectors, swivel joints, and rubber-metal bearing elements. Established in 1965, the company is renowned for its high-quality, durable, and maintenance-free products used across various industries including power plants, HVAC, and shipbuilding.
Product Specifications- Rubber Expansion Joints: Designed to absorb motion and noise, available in various structures and material qualities, with accessories like vacuum supporting rings and protective covers.
- Steel Expansion Joints: Feature durable steel bellows, available in axial, lateral, and angular versions, with accessories such as internal guide sleeves.
- PTFE Expansion Joints: Known for chemical resistance, suitable for aggressive media, with flanges and tie rod restraints.
- Swivel Joints: Used for rotational movement and torsion, available with various sealings and materials.
- Rubber-Metal Elements: Used for vibration damping and noise reduction, available in forms like stopper buffers and machine feet.
Applications
STENFLEX products are utilized in mechanical engineering, power engineering, shipbuilding, waste incineration, and water treatment, designed to absorb pipe expansion, vibration, and noise, and compensate for pipeline offsets.
Quality Assurance
STENFLEX operates under a certified Quality Management System compliant with ISO 9001:2015. Products undergo rigorous testing for quality assurance, including fire resistance, pressure, and leak tests, and hold various international approvals and certifications.
Technical Support and Services
STENFLEX offers technical support for product selection and application-based dimensioning, along with inspection services for installed components to ensure long-term reliability and performance.
Certification and Approvals
STENFLEX products are certified by numerous national and international standards, including ISO 9001:2015, CE-marking, and type approvals from organizations like DNV GL®, Nippon Kaiji Kyokai, and Lloyd’s Register.
Quality and Development
STENFLEX rubber expansion joints are designed to absorb movements and dampen vibrations in industrial equipment and pipeline systems, with continuous innovation to meet market demands.
General Description of Rubber Expansion Joints
Rubber expansion joints are used to compensate for movement, reduce tension, and absorb noise and vibration in various applications, handling axial, lateral, and angular movements.
Material Qualities
STENFLEX rubber bellows are made from synthetic elastomers like EPDM, CIIR, NBR, and CR, reinforced with materials like synthetic fibers or steel cords to withstand pressure and temperature variations.
Structure and Connection Parts
The rubber bellows have a three-ply structure for optimal performance, with connection parts including flanges and threaded connections designed to fit standard pipes and fittings.
Specifications:
The document outlines specifications for threaded connections and tie rod restraints used in rubber expansion joints, with materials like unalloyed steel and stainless steel for threaded parts.
Restraints:
Restraints are essential for lateral and angular expansion joints to absorb axial reaction forces, designed based on material strength values at +50°C.
Accessories:
STENFLEX rubber expansion joints can be equipped with vacuum supporting rings, internal guide sleeves, and protective covers.
Applications:
Rubber expansion joints are used in industries like mechanical engineering, heating installation, and chemical industry, suitable for reducing tension and compensating for installation inaccuracies.
Program Summary:
The document provides a detailed program summary of different types of rubber expansion joints, including nominal diameter, pressure rate, maximum operating temperature, rubber grades, and connection parts.
Overview: This document provides detailed specifications and applications for various types of rubber expansion joints, focusing on types AS-1, AS-1D, MS-1, AS-2, and AS-4, used to reduce thermal and mechanical tension in
piping systems.
Specifications: Lists dimensions, pressure ratings, and movement capabilities for each type of expansion joint, designed to operate at a maximum pressure of 16 bar and a temperature of up to 130°C.
Materials and Construction: Expansion joints are constructed with highly elastic molded bellows reinforced with steel wire cords, featuring rotatable flanges with stabilizing collars.
Applications: Applicable in industries like shipbuilding and heating plants, used in systems involving pumps, compressors, and engines.
Certifications: Products are certified under several standards, including CE (PED 2014/68/EU), DNV GL®, and Lloyd’s Register of Shipping.
Accessories: Optional accessories include vacuum supporting rings, internal guide sleeves, protective hoods, and tubes.
Notes: Users are advised to consider the chemical resistance of rubber materials and the impact of temperature on pressure ratings.
Specifications:
Details various types of rubber expansion joints, including Type AS-3, VS-1, AR-1, AR-2, and AR-4, designed to accommodate different movements and used in applications like shipbuilding and chemical industry.
Technical Design:
Maximum permissible operating pressure ranges from 16 to 25 bar, with a maximum temperature of +130°C.
Certificates:
Products are certified under various standards, including CE (PED 2014/68/EU), American Bureau of Shipping, and Bureau Veritas.
Accessories:
Available accessories include vacuum supporting rings, internal guide sleeves, protective hoods, and tubes.
Applications:
Used to reduce thermal and mechanical tension, compensate for installation inaccuracies, and muffle vibration and noise.
Materials and Corrosion Protection:
Standard materials include 1.0038 (S235JR) and stainless steel, with corrosion protection options like electrogalvanizing.
Notes:
Users are advised to comply with technical instructions regarding reaction force, moving force, and installation.
Specifications:
Outlines specifications for various types of rubber expansion joints, including Type AR-2, AR-4, R-1, R-2, GR-SAE, and RS-1, designed to compensate for movement in piping systems.
Procedures:
Installation instructions emphasize adhering to technical guidelines regarding reaction force, moving force, and fixed point load.
Standards and Certifications:
Comply with standards such as EN 1092, ANSI, and BS, certified by CE (PED 2014/68/EU), Bureau Veritas, and others.
Materials and Corrosion Protection:
Materials include various grades of rubber and metals, with corrosion protection options like electrogalvanizing.
Applications:
Suitable for use in systems with pumps, compressors, engines, and in shipbuilding and heating plants.
Accessories:
Available accessories include vacuum supporting rings, internal guide sleeves, flame-proof protective covers, and tubes.
Key Data from Tables:
Tables provide detailed dimensions and specifications for each type of expansion joint, including pressure rates and permissible vacuum levels.
Overview: Provides detailed specifications and applications for various types of rubber expansion joints, including types AG-5, AS-5, E, G, and C-1, designed to reduce thermal and mechanical tension.
Specifications:- Type AG-5: Universal expansion joint with rubber bellows and threaded ends, suitable for DN 20 – DN 50.
- Type AS-5: Similar to AG-5 but designed for DN 32 - DN 40, with a maximum temperature of +130°C.
- Type E: Cylindrical lateral expansion joint for DN 20 – DN 250, designed for lateral movement compensation.
- Type G: Conical lateral expansion joint for DN 25 – DN 250, with pressure rates of PN 10 and PN 16.
- Type C-1: Universal expansion joint for DN 300 – DN 3600, available in various geometries and lengths.
Materials and Construction: Joints are constructed with highly elastic molded bellows in various rubber grades, reinforced with synthetic fibers or steel wire cords.
Applications: Used in domestic industries, heating plants, oil hydraulic systems, cooling water lines, cement industry, and conveyance technology.
Technical Considerations: Users must comply with technical instructions regarding reaction force, moving force, and fixed point load.
Overview: Provides detailed technical specifications and applications for various types of rubber expansion joints used in industrial settings.
Key Sections:
- Specifications: Outlines materials, pressure ratings, temperature limits, and dimensions for different types of expansion joints.
- Applications: Used in power station technology, process plant engineering, air and ventilation technology, and dedusting and filter engineering.
- Certificates and Standards: Comply with CE (PED 2014/68/EU) and TÜV Süd (KTA) certifications.
- Corrosion Protection: Standard protection includes hot-dip galvanization.
- Accessories: Various accessories like vacuum supporting rings and internal guide sleeves are available.
- Customized Production: Availability of customized production options to meet specific client requirements.
- Technical Design: Detailed tables provide information on permissible operating pressures, temperatures, and bursting pressures.
Conclusion: Serves as a comprehensive guide for selecting and implementing rubber expansion joints in various industrial applications.
Overview: Provides detailed technical specifications and applications for STENFLEX® pipe connectors and steel expansion joints.
Specifications: Includes tables with dimensions, pressure ratings, and material specifications for various types of pipe connectors and expansion joints.
Procedures: Installation guidelines emphasize the importance of correct screw lengths and the need for robust fixed points.
Standards and Certifications: Comply with EN ISO 9001:2015 and are certified according to DIN 4809.
Applications: Used in various industries for absorbing sound and vibration, compensating for movement, and reducing tension.
Recommendations: Advises on the appropriate use of materials and the importance of adhering to technical instructions.
Key Features: Noted for high compressive strength, thermal endurance, and excellent noise and vibration damping capabilities.
Overview of Expansion Joints:
Expansion joints are critical components used to absorb movement in piping systems, available in axial, lateral, and angular types.
Types of Expansion Joints:- Axial Expansion Joints: Absorb axial movement and are equipped with internal guide sleeves.
- Lateral Expansion Joints: Designed to absorb lateral movement, requiring only light fixed points.
- Angular Expansion Joints: Allow for angular movement and are equipped with hinge restraints.
Materials and Construction:
Made from high-quality materials, including stainless steel, heat-resistant steel, and nickel-based alloys.
Connection Parts:- Flanges: Available in rotatable or fixed designs.
- Welding Ends: Coated for corrosion protection.
- Threaded Connections: Coated for corrosion protection.
Restraints and Accessories:- Tie Rod Restraints: Used in lateral expansion joints.
- Hinge Restraints: Used in angular expansion joints.
- Internal Guide Sleeves: Protect the bellows from abrasion.
Applications and Industries:
Used across various industries, including chemical, oil, food, and pharmaceutical industries.
Service Life and Maintenance:
Service life is influenced by factors such as pressure, temperature, movement, and load cycles.
Overview: Provides a comprehensive summary of STENFLEX® steel expansion joints, detailing various types, applications, and specifications.
Types of Expansion Joints:- Axial Expansion Joints: Designed to absorb axial movements and reduce tension in pipes.
- Lateral Expansion Joints: Accommodate lateral movements and are equipped with fixed flanges and hinge restraints.
- Angular Expansion Joints: Suitable for absorbing angular movements.
Applications: Applicable in various industries, including mechanical engineering, domestic industry, heating installations, chemical industry, plant construction, power industry, shipbuilding, pipeline construction, and more.
Specifications:- Materials: Bellows made from stainless steel grades and nickel-based alloys.
- Temperature and Pressure Ratings: Withstand temperatures up to +900°C and available in pressure ratings from PN 2.5 to PN 16.
- Connection Types: Options include rotatable flanges, fixed flanges, welding ends, and threaded connections.
Key Features:- Designed to reduce tension, absorb movements, and compensate for installation inaccuracies.
- Available in single or multi-ply structures for enhanced durability.
- Certified by various international standards.
Additional Information: Includes detailed tables with dimensions, pressure rates, and material specifications for each type of expansion joint.
Overview: Provides technical specifications and applications for various types of steel expansion joints, specifically types SF-11, SF-13, and SA-10.
Specifications:- Type SF-11: Vacuum-proof axial expansion joint with stainless steel bellows and welded flanges.
- Type SF-13: Designed for larger axial movements, featuring two stainless steel bellows and guide sleeves.
- Type SA-10: Features stainless steel bellows and welded pipe ends.
Materials and Design:- Standard materials include stainless steel grades with temperature resistance up to +550°C.
- Special designs and sizes are available upon request.
Applications:- Suitable for use in industrial applications, gas and water supply, exhaust systems, and heating installations.
- Can be used with pumps, compressors, engines, turbines, and process plants.
Certifications:- CE (PED 2014/68/EU), American Bureau of Shipping, Bureau Veritas, DVGW, DNV GL®, RMRS, Rina.
Accessories:- Internal guide sleeve, protective tube, and gas sealings for specific applications.
Technical Considerations:- Comply with general technical instructions regarding reaction force, moving force, and installation instructions.
- Pressure ratings and allowable pressure pulsations are specified for each type.
Overview: Provides technical specifications and applications for various types of steel expansion joints, focusing on axial and lateral expansion joints.
Specifications: Includes tables with detailed specifications for each type of expansion joint, including axial movement, axial spring rate, effective bellows cross-sectional area, and more.
Materials and Design: Made from stainless steel, with specific grades suitable for various temperature ranges and media.
Applications: Designed for use in industrial applications, heating installations, gas supply lines, and other systems requiring compensation for axial or lateral movement.
Certifications: Lists several certifications for the expansion joints, including CE (PED 2014/68/EU), American Bureau of Shipping, Bureau Veritas, DVGW, RINA, and DNV GL®.
Additional Notes: Emphasizes compliance with general technical instructions regarding reaction force, moving force, fixed point load, and installation instructions.
Overview: Provides technical specifications and applications for various types of steel and PTFE expansion joints.
Steel Expansion Joints:
- Type SA-24: A lateral expansion joint movable in one plane, featuring stainless steel bellows and welded pipe ends.
- Type SA-25: Similar to SA-24 but allows movement in all planes, using tie rods for restraint.
- Type SF-32 and SF-33: Angular expansion joints with hinge restraints.
Materials and Corrosion Protection:
- Standard materials include 1.0038 (S235JR) and stainless steel.
PTFE Expansion Joints:
- General Description: PTFE expansion joints are highly resistant to chemicals and solvents.
- Applications: Used in the chemical, food, beverage, and pharmaceutical industries.
- Structure and Versions: Available in universal and lateral types.
Certificates and Customization:
- All expansion joints comply with CE (PED 2014/68/EU) standards.
Key Considerations:
- Ensure compatibility of material grades with temperature and media.
Overview of STENFLEX® PTFE Expansion Joints
STENFLEX® PTFE bellows are crafted from high-quality materials to suit various operating conditions.
Connection Parts
These expansion joints are ready for installation and connect to pipes and other equipment using standard flanges.
Flanges
Flanges in the Ai-series have a machined groove for the rubber rim and are rotatable.
Restraints
Restraints are used in lateral expansion joints to absorb axial reaction forces.
Accessories
Optional accessories include internal guide sleeves and protective covers.
Applications and Industries
PTFE expansion joints are used in mechanical and chemical industries, plant engineering, and refuse incineration.
Technical Specifications
Various types of expansion joints are available, each with specific pressure ratings, temperature limits, and materials.
Certificates
STENFLEX® expansion joints comply with CE (PED 2014/68/EU) standards.
Overview: Provides technical specifications and applications for PTFE expansion joints and swivel joints.
PTFE Expansion Joints:- Types: Universal (Type P-1) and Lateral (Types P-2, P-4) expansion joints.
- Materials: Made of PTFE with stainless steel support rings.
- Applications: Used in chemical, pharmaceutical, and disposal industries.
- Specifications: Available for DN 15 to DN 500.
- Accessories: Include internal guide sleeves and protective covers.
Swivel Joints:- Design: Suitable for liquid and gaseous media.
- Applications: Used in flexible pipeline systems.
- Types: Various designs for different industrial applications.
- Technical Data: Operating temperature range from -20°C to +240°C.
- Connections: Available in flange, welded end, or threaded connections.
Quality and Testing:- Swivel joints undergo rigorous testing.
Overview: Provides detailed technical specifications and applications for STENFLEX® Swivel Joints.
Specifications: Swivel joints are categorized into various types based on movement and connection methods.
Design and Structure: Designed with either single-row or two-row ball bearings.
Applications: Used in various industrial settings.
Pressure Ratings and Surface Protection: Specifies pressure ratings for different materials and connection types.
Dimensions and Connections: Detailed tables provide dimensions for different forms and connection types.
Overview: Provides technical specifications and applications for various types of swivel joints and rubber-metal elements.
Swivel Joints: - Types: DK-01 and DK-02 swivel joints.
- Applications: Suitable for high-temperature and high-pressure environments.
- Specifications: Includes dimensions, pressure ratings, and materials.
- Features: Fast installation and surface protection options.
Rubber-Metal Elements: - Purpose: Used as absorbers to prevent vibration and noise transmission.
- Design and Rating: Elements are designed using advanced computing techniques.
- Properties: Discusses attenuation, elasticity, and other properties.
- Applications: Recommended for mounting appliances and machinery.
Technical Data: - Tables: Detailed tables provide dimensions and weights.
- Diagrams: Illustrate concepts like vibration insulation.
Conclusion: Emphasizes the importance of adhering to technical instructions.
Overview of Rubber-Metal Elements
Rubber-metal elements are designed for various industrial applications, offering different types, connection methods, hardness levels, and stress handling capabilities.
Types and Structures- Stopper Buffers: Cylindrical or parabolic rubber buffers with a metal plate.
- Buffer Elements: Cylindrical buffers with metal plates on one or both sides.
- Ceiling Elements: Elastic hollow profiles with safety bars.
- Rails: Flat rubber bodies with metal rails.
- Machine Feet: Elastic rubber bodies in metal casings.
- Bearing Elements: Highly elastic ring-shaped rubber bodies.
Material Qualities
STENFLEX® rubber-metal elements are made from synthetic elastomers with three standard hardness categories.
Applications and Properties
Used for shock absorption, sound and vibration damping, and protection from jarring.
Connection Parts
Equipped with standard screwed unions, typically featuring male or female threads.
Program Summary
Provides detailed specifications for various types of rubber-metal elements.
Specifications:
Outlines various types of rubber-metal elements used for damping sound and vibration.
Procedures and Applications:
Provides detailed instructions on the use of these elements for specific applications.
Technical Data and Standards:
Technical data sheets for each type of element provide dimensions, stress types, and tolerable loads.
Recommendations:
Recommendations are provided for the arrangement of fixed points and guide bearings in pipe systems.
Key Data from Tables and Diagrams:
Tables provide specific measurements for each type of element.
Critical Information:
Key parameters include the tolerable static permanent load (Ftol).
Specifications and Sound Absorption:
Rubber expansion joints type AS are designed to absorb structure-borne and water-borne sound.
Technical Annex - Sound Level Reduction:
Sound absorption requirements are based on DIN 4109 standards.
Absorbing Expansion by Steel Expansion Joints:
Expansion absorption depends on the center distance and maximum deflection angle.
Installation and Operating Instructions:
Proper installation and maintenance are crucial for the functionality and longevity of STENFLEX® expansion joints.
Initial Commissioning and Use:
Expansion joints with restraints are factory-adjusted and must be connected correctly post-installation.
Inspection and Maintenance:
Regular visual inspections are required to check for faults.
Specifications and Standards:
STENFLEX® expansion joints comply with the Pressure Equipment Directive 2014/68/EU.
Installation Instructions:
Ensure expansion joints are clean, dry, and free from damage before installation.
Operating Instructions:
Expansion joints should be operated within specified pressure, temperature, and movement limits.
Inspection and Maintenance:
Regular visual inspections are necessary to check for damage.
Quality Management:
STENFLEX® follows a Quality Management System in accordance with EN ISO 9001:2015.
Recommendations for Use:
Install expansion joints close to pump flanges.
Specifications:
Type GRV is available in dimensions ranging from DN 20 to DN 200.
Flange Connection Dimensions:
Provides detailed dimensions for flange connections according to various standards.
Material Designations and Temperature Tolerances:
Lists international material designations with maximum temperature tolerances.
Temperature and Length Changes:
Includes a table showing the change in length for various materials at temperature changes.
Pressure Conversion Table:
Provides conversions between different pressure units.
Glossary:
Defines key terms related to flexible pipe connections and expansion joints.
Key Recommendations:
Ensure flange connections are clear of horizontal and vertical axes for proper installation.
Overview: Provides detailed technical information on flexible pipe connections, expansion joints, and related components.
Key Sections:
- Definitions: Terms such as installation length, lateral movement, and load cycle are defined.
- Materials and Components: Descriptions of materials like NBR and PTFE, as well as components like rubber bellows and steel expansion joints.
- Pressure Equipment Directive: References Directive 2014/68/EU.
- Technical Specifications: Detailed specifications for pressure-compensated expansion joints.
- Testing and Certification: Information on type examinations and performance tests.
- International Contacts: A comprehensive list of international headquarters, subsidiaries, and agencies.
Critical Information: Emphasizes the importance of understanding the physical properties of materials and components used in pipeline systems.