Seals and Sealing System Design of Actuation Systems in Military and Commercial Aircraft
I.D. # C1212 Duration .5 Day
This half day seminar presents an overview of seals and sealing system design for military and commercial aircraft. It is aimed to provide engineers having some previous actuator and control valve design background with an understanding of the general hardware groove standards, standard parts for static applications and how seal designs and sealing systems can be best used in dynamic reciprocating and rotary applications. Information will be provided regarding seal material and fluid compatibility, friction drag, expected wear rates depending on operating conditions and duty cycle, hardware surface finish and topography. Also included will be information on seal installation procedures and potential pitfalls to avoid.    
Learning Objectives

By attending this seminar, you will be able to:


  • Identify the standards relevant to seals and seal systems

  • Summarize key characteristics of dynamic reciprocating applications

  • Summarize key characteristics of rotary applications

  • Evaluate seal material characteristics and proper applications
Who Should Attend

This seminar is designed for engineers and other key personnel with some actuator and control valve design knowledge.
Prerequisites

Attendees should have some previous actuator and control valve design experience.
Seminar Content

 


  • First O-Ring Patent
    • 1932-Niels A. Christensen


  • Parker: Development of Range of Sizes
    • Tables


  • AS568
    • Range of sizes

    • Cross sections

    • Tolerances to Class 2- Tables


  • History and Application of Aerospace Gland Dimensional Standards for Seals and Scrapers
    • MIL-P-5514 Revs A and B

    • MIL-P-5514 Revs C, D, and E

    • MIL-G-5514 Rev F

    • AS4716, AS5857, MS33675, AS4088, AS4052


  • History of Backup Ring Standards
    • MIL-R-8791, MS28774, MS27595, MS28782, MS28783

    • AS8791, AS5781, AS5782, AS5860, AS5861


  • EPDM History and Applications
    • NAS1613, NAS1611, NAS1612, AECMA specs

    • prEN 6111, prEN 6075, prEN6076


  • Elastomer Materials and Applications
    • In red oils

    • In fuels

    • In turbine oils

    • Properties


  • Storage of Elastomers
    • ARP5316


  • Plastic Materials and Applications
    • AMS3678 and slash sheets

    • Effects of fillers on PTFE materials


  • High Modulus Plastics
    • PEEK

    • PEKEKK

    • Carbon fiber composites

    • Properties and uses


  • Reciprocating Seals for AS4716 grooves

  • Piston Seals
    • Bi-directional - to fit std. and non-std grooves - examples

    • Uni-directional - to fit std. and non-std grooves - examples


  • Rod Seals
    • Bi-directional - to fit std. and non-std grooves - examples

    • Uni-Directional - to fit std. and non-std grooves - examples


  • Scrapers for MS33675, AS4088, and AS4052

  • Reciprocating Sealing Systems
    • Tandem and tertiary sealing systems with scrapers


  • Face Seals
    • Types for internal and external pressure


  • Seal Design Notes: An Appreciation
    • Low temperature considerations

    • High temperature considerations

    • Friction calculations: C of F for PTFE compounds

    • Friction calculations: Elastomers

    • Consideration of elastomer shear strength

    • Consideration of elastomer tensile strength

    • Consideration of elastomer elongation percentage

    • Thermal cycling: Reciprocating PTFE seal components


  • Rotary shaft seals
    • Metal can types: Elastomeric lip(s)

    • Metal can types: PTFE lip(s)

    • Flanged spring energized seals: Thermal cycling


  • Hardware Surfaces, Coatings, and Roughness Finishes
    • Dynamic

    • Static


  • Installation Tools and Procedures
    • For piston seals

    • For rod seals


  • Hardware Design Tips: Avoiding Installation and Performance Catastrophes

  • Pump/Motor Function Applications
Instructor(s): Andrew Clarke; Devin Prate

AndrewAndrew Clarke is an Applications Engineer for Greene Tweed & Co.¿s Sealing Systems division. With eight years of experience within the organization working on Aerospace systems, Mr. Clarke is a subject matter expert and provides technical leadership for the global engineering function.
While at Greene Tweed, Mr. Clarke has directly supported several OEMs with the development of complete sealing solutions for entire landing gear and actuator systems. In addition, he has overseen the technical development and release of a new seal product line. He has been directly involved in the development of several of procedures used at Greene Tweed for product development, and is also an internal auditor for AS9100.



Prior to Greene Tweed, Mr. Clarke worked for six years as a Mechanical Engineer for EPL Composite Solutions and Pera. During this time, he led technical work relating to the development of new technologies by government funded consortiums. These included the design of polymer component prototypes for a range of applications, including high pressure fluid transfer and gas storage systems.



Mr. Clarke received his MEng in Mechanical Engineering from the University of Nottingham in the UK.



DevinDevin Prate has been instrumental in the design and implementation of sealing systems at Greene Tweed & Co. since 2013. As an Applications Engineer and Technical Product Specialist, Mr. Prate has worked with OEM and component suppliers within the aerospace and defense industries to specify and qualify high performance seals and materials. He has been the technical lead on many large landing gear and actuation projects as well as new seal technology developments. Mr. Prate currently serves as the Secretary on the SAE A-6C2 Seals Panel and has been an active member of the SAE A-6 Aerospace Actuation, Control and Fluid Power Systems Committee since 2015. Mr. Prate has a Bachelor of Science degree in Mechanical Engineering from the University of Delaware.
Fees: $299 SAE Members: $299

 
CEU .7