RPP engineering presentation
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The document discusses the history and development of diaphragm seals. It notes that the concept of diaphragms dates back centuries when leather diaphragms were used in ancient pumps. Fabric-reinforced elastomeric diaphragms were developed in the early 20th century. The document then provides a brief history of RPP Corporation, including its founding in 1963 in Massachusetts, expansion to a larger facility in the 1970s, and establishment of an international sales office in Germany in 2000. It employs around 130 people between its two facilities.
RPP engineering presentation
- 2. History of the Diaphragm Seal Concept of the diaphragm goes back centuries Leather diaphragms were used in pumps in ancient times 2
- 3. History of the Diaphragm Seal Fabric reinforced elastomeric diaphragms were developed in the early 20th century Long stroke rolling diaphragms were developed in the late 1940’s – Fabric preforming 3
- 4. RPP Corporation History Lynn Boston Established in 1963 in Lynn, Massachusetts 4
- 5. Boston Lawrence RPP Corporation History Focused in industrial markets primarily process control and water management Moved to 55,000 square foot facility in Lawrence, Massachusetts 5
- 6. RPP Corporation History Established sales and distribution facility in Kehl-Kork, Germany in 2000 Employ about 130 people in both facilities Berlin Kehl-Kork 6
- 7. RPP Corporation History Material development Diaphragm development Performance analysis Product Development Capabilities 7
- 8. Diaphragm Application Requirements Conversion of pressure to force Seal Requirements 8
- 11. Diaphragm Application Requirements Sensitivity to pressure differentials No breakaway friction Zero leakage Application Requirements 11
- 12. Design Parameters to Meet Application Requirements Effective Area 12
- 13. Design Parameters to Meet Application Requirements Stroke 13
- 14. Design Parameters to Meet Application Requirements Economical hardware design Hardware Design Requirements 14
- 15. Design Parameters to Meet Application Requirements Pressure Capability Convolution Width 15
- 16. Design Parameters to Meet Application Requirements Temperature Capability 16
- 17. Design Parameters to Meet Application Requirements Operating Media Compatibility 17
- 18. Design Parameters to Meet Application Requirements Cycle Life Requirement 18
- 19. Typical Applications Process Control Valves Input Output Process Process Controller Feedback Signal Signal Pressure 19
- 23. Conversion of Application Requirements to Diaphragm Requirements Effective Area = Diameter Diaphragm Geometry 23
- 24. Conversion of Application Requirements to Diaphragm Requirements Stroke = Height Diaphragm Geometry RP 1.56 Convolution Width RF 1/2 Stroke Convolution Width 2 RP / RF 1/2 Stroke 24
- 25. Conversion of Application Requirements to Diaphragm Requirements Hardware Design = Flange Design Diaphragm Geometry 25
- 26. Conversion of Application Requirements to Diaphragm Requirements Pressure Capability = Fabric Specifications Diaphragm Materials Convolution Width 26
- 27. Conversion of Application Requirements to Diaphragm Requirements Temperature Capability = Fabric and Elastomer Specifications Diaphragm Materials 27
- 28. Conversion of Application Requirements to Diaphragm Requirements Operating Media = Elastomer Specifications Diaphragm Materials 28
- 29. Conversion of Application Requirements to Diaphragm Requirements Cycle Life Requirement = Fabric to Elastomer Adhesion Diaphragm Quality Criteria Fabric Elastomer 29
- 30. Conversion of Application Requirements to Diaphragm Requirements Flexibility = Thickness and Tolerances Diaphragm Quality Criteria Molded Dimension ± 2% Molded Dimension ± 2% Processing Dimension ± 30% Die-Cut Dimension ± 0.5% Processing Dimension ± 15% Processing Dimension ± 4% 30
- 31. Conversion of Diaphragm Requirements to Diaphragm Design Height to diameter ratio Manufacturing Considerations 31
- 32. Conversion of Diaphragm Requirements to Diaphragm Design Material processing limitations Manufacturing Considerations 32
- 33. Conversion of Diaphragm Requirements to Diaphragm Design Flange beads Manufacturing Considerations 33
- 34. Conversion of Diaphragm Requirements to Diaphragm Design Rolling (top hat) Diaphragm Style 34
- 35. Conversion of Diaphragm Requirements to Diaphragm Design Pre-convoluted Diaphragm Style 35
- 36. Conversion of Diaphragm Requirements to Diaphragm Design Offset-convoluted Diaphragm Style 36
- 37. Conversion of Diaphragm Requirements to Diaphragm Design Dished Diaphragm Style 37
- 38. Conversion of Diaphragm Requirements to Diaphragm Design Single-coated Diaphragm Construction 38
- 39. Conversion of Diaphragm Requirements to Diaphragm Design Double-coated Diaphragm Construction 39
- 40. Conversion of Diaphragm Requirements to Diaphragm Design Bleed-thru Diaphragm Visual Quality Criteria 40
- 41. Conversion of Diaphragm Requirements to Diaphragm Design Strike-thru Diaphragm Visual Quality Criteria 41
- 42. Conversion of Diaphragm Requirements to Diaphragm Design Fabric impression Diaphragm Visual Quality Criteria 42
- 43. Conversion of Diaphragm Requirements to Diaphragm Design Voids and non-fills Diaphragm Visual Quality Criteria 43
- 44. Conversion of Diaphragm Requirements to Diaphragm Design Adhesion Diaphragm Visual Quality Criteria 44
- 45. 45 Validation of Diaphragm Design to Application Requirements Diameter = Effective Area – Piston Diameter – Cylinder Bore Diameter – Effective Diameter
- 46. Validation of Diaphragm Design to Application Requirements Height = Stroke Requirement – Overall Height / Piston Diameter – Convolution Height / Convolution Width 46
- 47. Validation of Diaphragm Design to Application Requirements Materials = Pressure, Temperature and Media Requirements – Elastomer Selection / Temperature and Media – Fabric Selection / Working Pressure and Media 47
- 48. Validation of Diaphragm Design to Application Requirements Quality = Performance Requirements – Fabric to Elastomer Integrity – Visual Quality Criteria – Dimensions – Materials 48