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2 USA (Bartlett, IL) Division
3 USA (Bartlett, IL) Division 100+ years Manufacturing Experience Six Sigma Black Belt (2) 350,000 Sq. Ft. Manufacturing & Office Total Program Development & Management Product Development & Test Facilities Product Testing: Cycle/Leak/Stress Testing
4 Manufacturing Expertise Welding: TIG, MIG, Laser, Resistance Forming: Hydroforming, Stamping, Folding, Flexible Tubing making (Bend-A-Flex) Cleaning: Aqueous, Solvent, Flushing, Clean Room Environment Brazing: Furnace, Induction, Manual Heat Treat: Vacuum, Atmosphere
5 Prototype Laboratory 15,000 Sq. Ft. of Floor Space Production Representative Equipment Full-Time Laboratory Tech s Test Laboratory 24,000 Sq. Ft of Floor Space Cycle Life Testing Thermal Fatigue Testing Full Test Engineering Staff
6 Senior Flexonics Business Unit Medical (Cryogenics, Endoscopic Tools - Bend-A-Flex Tubing & Heat Exchangers products) Semiconductor (Vacuum Components Bellows, Bend-A-Flex Tubing products) Power (Stationary Engines, Gas Turbines, and Fuel Cells Bellows, Bend-A-Flex Tubing & Heat Exchanger products) Petrochemical (Gas Lift, Oil & Gas Exploration Bellows) General Industrial (Instrument & Controls, Valves, Electrical Switch Gear -Bellows)
7 Gas-Lift Bellows
8 Application Functional Requirements Pressure: typical operating 800 psi psi, 1800 psi max. Bellows design pressure 1 valve = 721 psi Bellows design pressure 1-1/2 valve = 260 psi Stroke: valve full travel based on port size, but typically rated close to bellows design spec. Bellows design stroke for 1 valve =.167 Bellows design stroke for 1-1/2 valve =.287 Temperature: typically based on elastomers used in valve. Std valve 250 degf, max 400 degf. Monel meets this requirement. Cycle Life: New multi-level API/ISO specification under development. Highest level would require life cycle testing and certification.
9 Bellows Design 101 Question: How do you design a bellows? Answer: Very Carefully
10 Calculation Methods Flexonics equations EJMA equations ASME Section VIII equations ASME B31.1 and B31.3 equations ASME Section III equations
11 EJMA Expansion Joint Manufacturers Association Industry group composed of 7 manufacturers of expansion joints (including Senior Flexonics) Current standard is the 7th edition
12 Bellows Design Inputs outer diameter - OD inner diameter - ID wall thickness - t number of plys - n pitch - q number of convolutions - N material type
13 Bellows Operating Conditions Temperature Pressure Motion axial lateral angular
14 Bellows Design Characteristics Pressure Rating Spring Rate Effective Area Cycle Life Natural Frequency
15 Pressure Rating Bellows can be internally or externally pressurized. Internally pressurized bellows are subject to squirm (instability). Internally pressurized bellows exert pressure thrust force on mating hardware and components. Pressure rating proportional to thickness to the 2.0 power
16 Comments on Pressure Considered only for internally pressurized bellows. Two types of instability column instability called squirm in-plane instability called tilt Squirm is gross lateral shift of center section of bellows while ends remain fixed Tilt is when convolutions become non parallel to each other. Flexonics equation is less conservative
17 Spring Rate Bellows have elastic properties similar to a spring. Bellows can be deflected by pressure as well as mechanical loading Spring rate is not linear but varies over loading range and bellows deformation Proportional to the wall thickness to the 2.7 power.
18 Comments on Spring Rate EJMA equations can over predict spring rate. Flexonics has empirical data on spring rates for standard size bellows. If spring rate is an important design consideration, always verify calculated number with empirical data and check spring rate on individual bellows as part of manufacturing process.
19 Effective Area Area of circle lying midway between bellows ID and OD Similar to piston exterting same thrust as bellows when subjected to same pressure
20 Cycle Life Determined from S-N curves for various materials Calculate deflection stress using EJMA equations. Stress is fictitious stress based on elastic formulas - plastic deformation is not considered.
21 Flexonics Cycle Life In 1968 Flexonics developed a SST S-N curve based on bellows and coupon testing. In 1971 similar curves were derived for other alloys. These curves can be used with the total stress from EJMA to predict cycle life.
22 Comments about Cycle Life The only way to confirm a cycle life prediction is to perform cycle testing of bellows. Cycling pressure and motion is more severe than constant pressure and motion cycling. Predicted cycle life is affected by operating temperature.
23 Comments about Vibration To avoid resonance the bellows natural frequency shall be lower or at least 50% higher than the system frequency Flow induced vibration of bellows can occur with high velocity flow. An internal liner must be used to reduce this phenomenon.
24 Design Maximum Stress & Fatigue Life σ max N min = 7.9E6, Inner surface of the outer ply.
25 Data Aquisition for Model Verification
26 Von Mises Stresses Inner & Outer Stresses of Multi Ply Bellow
27 Bellows Model 2-Ply 26 Corrs w/ 85 mm OD, 75 mm ID mm THK,7.112 mm Pitch, 321 S. S.
28 General Process of Making Gas-Lift Bellows Seam-welding & cutting of the 3 tubes (plies) Draw processing to get tubes to their final wall thickness Tubes are telescoped together to form one 3-ply tube Bulge formed Roll forming we now have a functional bellows Trimming the ends Circumference weld Leak Test Final Inspection
29 Tube Welding
30 Welded Tubes
31 Tubes Awaiting Cleaning
32 Telescoping 3 tubes into 1
33 Tube Bulging
34 Roll Forming
35 Trimming
36 Trimming
37 Circle Welding the Plies
38 Mass Spectrometer Leak Testing
39 Typical Failure Modes and Causes During Manufacturing Inadequate circle welds on plies Found at final Leak Test Operation From the Field Fatigue Failure Over Pressurization
40 Over Pressurization
41 Over Pressurization
42 Possible Bellows Performance Improvements Inconel Bellows Valve redesign to minimize over pressurization
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