PGE Products

PGE staff pursue development of new and novel designs to meet our customer's specific needs.

Our diverse engineering expertise includes:

  • Integration of nuclear safety principles into effective and efficient design elements

  • Operation and design of molecular lasers

  • Heat exchanger design, with particular experience in cold-trap design


Safe Geometry Vacuum

Operations involving fissile materials (e.g., 235U, 239Pu) introduce the risk of a criticality accident resulting in a release of radiation that can be lethal to nearby workers. Experience has shown that such operations can be performed safely and economically when proper precautions are taken. Over the years, the criticality safety community has been challenged with finding a safe geometry vacuum cleaner designed to ensure the system will remain sub-critical regardless of the amount of material held-up or collected in the vacuum interior volume. Sites have made assumptions or placed restrictions on use of vacuum cleaners for cleanup of fissile material spills/debris.

Paschal Gross Enterprises (PGE) has developed a safe geometry vacuum cleaner for removal of dust and debris in areas that contain fissile isotopes, such as 235U or 239Pu. The design makes novel use of on-axis fan technology and PGE-developed baffles that separate particulate and air flow to allow collection of material into user-supplied external containers, such as a poly bottle. The configuration and design allow the inlet, flow baffles, internal HEPA filtration, fan and exhaust to fit within a cylinder diameter that is a safe geometry for fissile materials, such as 235U or 239Pu. The design can also be incorporated into a cage assembly that provides passive spacing from other potential sources of fissile material in order to provide interaction control to prevent accidental nuclear criticality accidents.

Heat Transfer

heat transfer

The MPM-series heat exchangers provide a compact design that can be operated over an extremely diverse range of operating conditions. They have been successfully operated in phase separation applications involving de-sublimation.  The diversity of the concept allows the customer to tailor the operating parameters to meet individual operational demands.


  • Coolant maintained outside gas cooling barrier

  • External cooling

  • Low pressure drop in gas flow path

  • High heat transfer surface area

  • Wide selection of materials of construction

  • Skid-mounted packages available with cooling/heating handling unit

  • Flow limiting inlet to minimize “break-through” flow rates

Sample Application:

The MPM-series is ideal for condensed-phase collection from a gas stream. For example, the MPM10-40s-48.0-m can be operated as a condensing unit to separate gas streams with widely differing phase equilibria. This particular model offers the following basic specifications:

  • 10-inch gas chamber diameter

  • All Monel construction

  • Schedule 40 gas chamber shell

  • 12-inch cooling tank diameter

  • 4-feet active trapping length

  • More than 110 square feet of condensing surface area