The condenser-receiver is fully equipped with gauge glass and necessary valves for controlling ammonia and water flow. The water regulator operates automatically by ammonia pressure and includes a cleanable strainer. Crankshafts are drop-forged from high-grade steel, heat-treated for toughness and rigidity. Safety features include pressure relief valves on discharge lines and condenser-receivers; automatic cut-outs to stop motors if head pressures rise too high; safety cylinder heads held down by springs instead of bolts; self-closing valves on ammonia liquid and oil gauges with ball checks that close if glass is broken; overload and undervoltage protection in motor starters. Machines are built in four sizes: 3” by 3”, 4” by 4”, and 5” by 5”. All sizes feature one-piece castings for permanent alignment, special alloy semi-steel for tightness, strength, and wear resistance, sand-blasted and pressure-tested castings, honed cylinder walls, extra thick. Cylinder heads lift if liquid ammonia enters cylinders; wasteful clearance space is eliminated safely. Valves are either poppet or plate type, light moving parts that are quiet, tight, and reliable. Pistons have five rings, pistons are polished to accurate size, connecting rods are H-section for stiffness and strength, crank bearings are marine-type with shims for adjustment, chrome-vanadium steel bolts secured by lock nuts and pins, shaft runs in oil, full-size one-piece manifold supplied includes two ammonia gauges on metal board, packing for stuffing box, set of wrenches and tools, foundation bolts and wedges, hose for drawing in oil, enameled instruction chart, piston ring guide, erecting drawings. <Callout type="important" title="Safety Features">Pressure relief valves, automatic cut-outs, safety cylinder heads held down by springs instead of bolts, self-closing valves on ammonia liquid and oil gauges with ball checks that close if glass is broken.</Callout> Machines are built in four sizes: 3” by 3”, 4” by 4”, and 5” by 5”. All sizes feature one-piece castings for permanent alignment, special alloy semi-steel for tightness, strength, and wear resistance, sand-blasted and pressure-tested castings, honed cylinder walls, extra thick. Cylinder heads lift if liquid ammonia enters cylinders; wasteful clearance space is eliminated safely.
Key Takeaways
- Ammonia refrigeration units include critical safety features such as pressure relief valves and automatic cut-outs to prevent motor damage from high head pressures.
- The design of the cylinder heads allows them to lift if liquid ammonia enters, eliminating wasteful clearance space safely.
- All sizes of machines feature one-piece castings for permanent alignment and special alloy semi-steel for tightness, strength, and wear resistance.
Practical Tips
- Ensure regular maintenance checks on pressure relief valves and automatic cut-outs to prevent motor damage from high head pressures.
- Inspect cylinder heads regularly to ensure they can lift safely if liquid ammonia enters the cylinders.
Warnings & Risks
- High head pressure can cause significant damage to motors; always monitor and maintain proper safety measures.
- Improper maintenance of safety features such as pressure relief valves and automatic cut-outs can lead to catastrophic failures.
Modern Application
While modern refrigeration systems have advanced significantly, the principles of safety design and regular maintenance remain crucial. Understanding historical designs like those described here provides a foundation for recognizing critical components in contemporary systems.
Frequently Asked Questions
Q: What are some key safety features included in the ammonia refrigeration units?
Key safety features include pressure relief valves on discharge lines and condenser-receivers, automatic cut-outs to stop motors if head pressures rise too high, safety cylinder heads held down by springs instead of bolts, self-closing valves on ammonia liquid and oil gauges with ball checks that close if glass is broken.
Q: How are the machines built in terms of size?
The machines are built in four sizes: 3” by 3”, 4” by 4”, and 5” by 5”. All sizes feature one-piece castings for permanent alignment, special alloy semi-steel for tightness, strength, and wear resistance.
Q: What happens if liquid ammonia enters the cylinders?
If liquid ammonia enters the cylinders, safety cylinder heads lift to eliminate wasteful clearance space safely.