Military-grade Flowmeters | Tough enough to pass shipboard qualification testing for shock, vibration, and EMI. Our history in supplying flow systems for shipboard use can be traced back to the 1970s. And, the legacy regarding our shipboard systems continues with another successful round of shock, vibration, and EMI (electromagnetic interference) testing completed.

Recently, the model HO3/4-SY100 turbine flow meter design equipped with the Redi-pulse coil and a model HIT-4 flow computer was successfully tested to meet multiple shipboard MIL (military) standards at Dayton T. Brown. Testing was performed under MIL-S-901D “Shock Tests, H.I. (High Impact) Shipboard Machinery Equipment” and MIL-STD-167-1, Mechanical Vibrations of Shipboard Equipment.

Navy Shock Vibration

Both the flanged turbine flow meter and the model HIT-4 display unit were “hard mounted” to the standard 4A fixture for the Shock Testing. Furthermore, a 400-pound hammer was dropped nine times to make an impact with the anvil plate! The Shock Test was conducted from three different axes relative to the test fixture.

For the Vibration Testing, the flanged turbine flow meter and the model HIT-4 display must pass testing for shipboard conditions that simulate mechanical vibrations originating from those of 1) environment and 2) those arising from internal excitation.

The ¾” flow meter and model HIT-4 display was mounted to the vibration test fixture and subjected to three phases of mechanical vibration: exploratory, variable, and endurance. The tests were conducted on three axes in the frequency range of 4 to 33 Hz. with a total duration of nearly 6 hours per axis!

EMI Testing

The flow system was also tested for EMI compliance to MIL-STD-461F (Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment). A total of ten tests were performed, consisting of two main categories: emissions and susceptibility.

Emissions testing ensures that the electromagnetic energy conducted and radiated by the flow system does not exceed the specified limits. The susceptibility portion tests the ability of the flow system to operate within specified tolerances when exposed to electromagnetic energy conducted and radiated from external sources.

It is important to note that Hoffer Flow Controls is the only Military Shock and Vibration qualified provider of Turbine Flowmeters in the world.

EMI tests at Northrup Grumman Newport News shipbuilding

Previously, our 4″ & 2″ turbine flow meters with integrally mounted model HIT display units shock, vibration, and EMI were tested at Northrup Grumman Newport News shipbuilding. We have a long-standing history of supplying shipboard-qualified flow measurement systems for the US Navy and other navies worldwide.

Shipboard qualified meter sizes range from ¼” through 4” in size. Meter designs with 37 degrees MS flare, NPT, and ANSI flanged end connections are in use on ships for a wide variety of different applications. These applications include fuel measurement and reverse osmosis water measurement on the seawater side and the potable waterside.

In fact, our flow meters are in use on radar cooling applications on multiple classes of ships for the US Navy. Another application of our turbine flow meters is on Submarines measuring flow in ballast control and missile cooling.

Military-grade Flowmeters, for the United States Military

Hoffer Flow supplies Turbine Flowmeters, flow meter products to the U.S. Government.

About Hoffer Flow Controls

Hoffer Flow Controls has been designing and manufacturing quality turbine flowmeters and related process instrumentation for more than fifty years. Today Hoffer Flow Controls manufactures high-precision turbine flowmeters to measure clean liquids and gases throughout the processing industries. Please be sure to follow Hoffer Flow Control on Linked In