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Closed Combustion Chamber

Precision Testing for Gun Propellants

The Closed Bomb (Powder Bomb) is used for determining the quickness and force of a test propellant sample, by a relative or an absolute procedure. It is used primarily for gun propellants. These closed bomb results provide an indication of changes in propellant for quality control and for a possible prediction of the ballistic results of an item using the propellant in question. A variety of sizes, 75cc thru 2,400cc are available with optional monitoring instrumentation and controls.

In December of 2022 DIT acquired the Harwood Engineering “Closed Bomb (Powder Bomb)” technology. DIT has continued to build this same design as well as service spares to previously built Harwood Engineering products.

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Features & Benefits

The Advantages of the Closed Bomb

Key Features

  • The system is designed for remote operation and provides all necessary components for testing except the N2 source and the heating/cooling control source.  These are available upon request.
  • Made for MIL-STD-286.
  • Design: The vessel is a thick walled cylindrical chamber with removable closures. It is jacketed for temperature control, and has electrical feed thru for ignition of the sample. The vessel is rated for a maximum allowable working pressure of 90,000PSI (6000) bar at normal test temperatures of approximately 21C. 
  • Exhaust Valve: The valve is plumbed to the vessel via “cone and threaded” high strength tubing and fittings. 
  • Transducer: Quartz piezo-electric dynamic pressure transducer and signal amplifier.
  • Trunnion Stand: The stand is mounted on locking casters and has a trunnion mount device for rotating the vessel to aid in loading, maintenance and cleaning of the closed bomb chamber.
  • (Optional) Data Acquisition & Control: Turnkey solution that provides a remote control console containing the ignition power source, keyed “safe and arm switch”, displays, and data acquisition. The software is a windows based data acquisition system. Data obtained includes burning rate, BR/psi curve, DP/DT curve (vivacity information), coefficient, etc.

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