CGAConnect Webinar:

Pressure Relief Devices – Evolution, Design, and Safety Considerations

Wednesday, June 23, 2021

2:00 – 4:00PM Eastern

(11AM Pacific; 12PM Mountain; 1PM Central)

(part of the CGAConnect 2021 family of online events)



  • Tom Drube – VP of Engineering, Chart Industries, Inc.
  • John A. Eihusen, PE – Principal Engineer, Hexagon Composites
  • John Piscitelli – Director of Engineering, Sherwood Valve LLC
  • Jerrold D. (Jerry) Sameth – Technical Manager, CGA

May 12, 2021

A pressure relief device (PRD) protects a pressurized container from rupture due to over pressurization – preventing a catastrophic event that can harm people and damage equipment. Regardless of your background (extensive to some or no experience with PRDs) this webinar will help you advance your knowledge of this important topic.

CGA Technical Manager Jerry Sameth will kick off the webinar with a look back at the genesis of pressure relief devices from 1680 to 1913 when the Compressed Gas Association was founded. He’ll also review the current landscape for pressure relief devices – exploring their applications for industrial, medical, and specialty gases.

Next, John Piscitelli with Sherwood Valve will discuss pressure relief devices on compressed gas cylinders. He’ll review incoming inspection and testing of various PRDs specified in CGA S-1.1, Pressure Relief Device Standards-Part 1-Cylinders for Compressed Gases (CG1, 2, 3, 4, 5, and 7) including disks, fuse metal and springs, along with assembly and process testing of finished assemblies to ensure leak tightness, burst pressure, as well as start to discharge on CG7s.

Tom Drube with Chart Industries will then provide an overview of pressure relief devices on portable and stationary tanks. He’ll examine vital information from CGA S-1.2, Pressure Relief Device Standards-Part 2-Portable Containers for Compressed Gases and CGA S-1.3, Pressure Relief Device Standards-Part 3-Stationary Storage Containers for Compressed Gases, including the basis for relief device sizing, comparison with other codes, the significance of Gi, Gu, A^0.82, the reference temperatures of 1200F and 590F, as well as a discussion of valve chatter.

John Eihusen with Hexagon Composites will follow with a discussion of pressure relief devices on composite overwrapped pressure vessels (COPVs), including configuration and operational differences from other types of PRDs. He’ll also explore applications in large tubes and vehicle applications including hydrogen, compressed natural gas (CNG), helium, and marine operations.

Jerry Sameth will close the presentations with an exploration of CGA’s ongoing commitment to pressure relief devices – including incorporation by reference (IBR), testing conducted, ongoing interactions with U.S. Department of Transportation (DOT), ISO, and the UN/ECOSOC Sub-Committee of Experts on the Transport of Dangerous Goods (UNSCETDG).

A lively panel discussion will follow.

Audience Level

  • Non-technical, entry-level (little to no knowledge of the topic is required)
  • Intermediate (basic knowledge and understanding of the topic)
  • Advanced (extensive knowledge and experience with pressure relief devices)

The two-hour webinar will have opportunities for Q&A with the audience, so come prepared with your questions.

Webinar Fee

$0        Employees of CGA member companies

$95      Non-member price, per person

About Our Speakers

Tom Drube, Chart Industries, Inc.

Tom Drube serves as Vice President of Engineering at Chart. He has been with the company since 1989, with experience in the design and manufacturing of cryogenic components. He has been involved in LNG (liquid natural gas) and hydrogen systems since the early 1990s.

He holds 26 U.S. patents in the cryogenic and LNG areas. Tom is registered in Minnesota and California as a professional engineer. He holds a BS in Mechanical Engineering and an MS in Management of Technology from the University of Minnesota.

John A. Eihusen, PE, Hexagon Composites

John Eihusen is a Principal Engineer with Hexagon Composites, in the Research and Development Division. With over 35 years of experience in the development of high-performance composite structures for aerospace and automotive applications, John supports advanced design, analysis, materials selection, and process development across Hexagon’s independent business units.

He is a registered professional engineer in the state of Nebraska, and has been awarded 11 U.S. and international patents. He holds a BS and MS in Mechanical Engineering from the University of Nebraska Lincoln Nebraska.

John Piscitelli, Sherwood Valve LLC

John Piscitelli is the Director of Engineering at Sherwood Valve LLC. He has been with the company since 1992 with experience in designing and manufacturing cylinder valves and pressure relief devices. His team is responsible for overseeing and managing all of Sherwood’s valve designs, new product and process development, as well as participating on various safety committees.

John and his team have designed various PRDs conforming to CGA S-1.1 and ASME codes. He holds a BS in Mechanical Engineering, an MBA, and also an MS in Industrial Engineering from the University of Pittsburgh.

Jerrold D. (Jerry) Sameth, CGA

As a CGA Technical Manager, Jerry Sameth provides technical management of committees covering specialty gases, compressed gas cylinders, cylinder valves, industrial gas apparatus, environmental issues, and bulk distribution of compressed gases. Before joining the Association staff in 2013, Jerry worked over 30 years at Matheson, where he managed the technical aspects of cylinders and valves.

He has been active in CGA since 1984, and has Chaired several committees. Jerry holds a BE in Chemical Engineering from the City College of New York.


Limited sponsorships for this webinar are available to CGA member companies, at Gold, Silver, and Bronze levels. For more information and to reserve your company’s desired sponsorship level, contact Sarah Saunders, CGA’s Director of Marketing and Communications, at 703-395-0696. Sponsorships are awarded on a first come, first serve basis.