Daniel J. Durbin, EMT-B, KC9STX shared some detailed information about the McHenry County Emergency Management Agency (MCEMA):
The MCEMA operates with a variety of vehicles and equipment to support emergency response efforts in the county. Their communications unit is designated as EM-52, while their heavy equipment unit is known as EM-55. In addition to these, they have a minivan, EM-50, which serves as the shift commander’s vehicle. They also own a cargo equipment trailer (T-1), a sheltering trailer (T-2), and a power generator/light unit (P-1). The director and assistant director both have cars—EM-01 and EM-02 respectively—which are former McHenry County Sheriff’s Department squad cars. The minivan and trailers were specifically purchased for MCEMA use.
EM-52 was originally a Snap-On delivery truck before it was used by the Hebron Rescue Squad as a heavy rescue unit. EM-55 is a state-owned vehicle that has been assigned to MCEMA. All of the main vehicles—EM-50, EM-55, EM-01, and EM-02—are based at the MCEMA headquarters located at 2200 N. Seminary Avenue in Woodstock. EM-52 is stationed in Hebron, and the trailers are stored in a barn near the government campus in Woodstock. This building is part of the McHenry County Government Center.
MCEMA uses several radio systems for communication, including VHF frequencies such as 155.0250 (KTB234) and 146.8350 (Amateur Radio - K9ESV), as well as the McHenry County Starcom system, which operates on a trunked 800 MHz network. The team consists of around 50 volunteers, along with full-time staff including the director, assistant director, emergency planner, and executive secretary.
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McHenry County EMA Communications unit
![McHenry County EMA equipment squad McHenry County EMA equipment squad]()
McHenry County EMA heavy equipment unit
Block Heat Exchanger
Block heat exchangers are compact, modular heat exchange devices classified based on materials, structural designs,
application scenarios, and manufacturing processes. the structured summary of classification as below: Classification by Material
1. Graphite Block Heat Exchanger - Structural Features: Made of impregnated or molded impervious graphite, offering high corrosion resistance and
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1. Block-and-Hole Heat Exchanger - Composed of multiple perforated graphite blocks stacked together, allowing fluid exchange through interconnected channels (e.g., *Cylindrical Block Graphite Heat Exchanger*). 2. Shell-and-Tube Block Structure - Modular shell-and-tube designs, including fixed-tube and floating-head types. Examples include *Complex Shell-and-Tube Graphite Heat Exchanger*. 3. Monolithic Block Heat Exchanger - Single-piece structures formed by casting or injection molding, eliminating welds and enhancing pressure resistance (e.g., ceramic or metal monolithic blocks). Classification by Special Functions
1. High-Pressure Thread-Locked Ring Heat Exchanger - Design Features: Employs threaded locking rings for sealing, suitable for high-pressure hydrogen environments (e.g., hydrogenation reaction systems). Corrosion resistance is improved via optimized materials like hydrogen-resistant steel. 2. Corrosion-Resistant Block Heat Exchanger - Examples include *Double-Side Corrosion-Resistant Cylindrical Block Graphite Heater*, designed for strong acid media. Classification by Manufacturing Process
1. Modular Assembly Type - Multiple modules connected via bolts or adhesives, facilitating maintenance (common in graphite heat exchangers). 2. Integrated Monolithic Type - Molded in one piece for high structural integrity, such as cast ceramic or metal blocks. Application Scenarios
- Chemical Industry: Graphite and ceramic block exchangers handle corrosive media (e.g., sulfuric acid, phosphoric acid). - Energy & High-Pressure Systems: Thread-locked ring exchangers are used in petroleum hydrogenation and high-pressure steam systems. - High-Temperature Environments: Ceramic blocks excel in waste heat recovery from high-temperature exhaust gases.
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