Condenses high temperature, high pressure gas to high pressure liquid using seawater as a cooling medium.

1. High pressure liquid drains

2. Stores liquid refrigerant

3. Provides liquid seal

1. Installed throughout the refrigeration unit.

2. They are opened/closed to start and stop liquid or gas flow through the refrigeration system.

1. Contains desiccant which absorbs moisture from the liquid refrigerant.

2. Has moisture indicator, which tells when it needs to be replaced.

Lowers the refrigerant pressure and temperature (through expansion).

The low pressure refrigerant vaporizes to a low pressure gas inside the shell which is used to remove heat from the HP air stream.

What are the power requirements for an AC motor?

What are the power requirements for an AC Magnetic Motor Controller?

What are the power requirements for utility heaters?

How much heat can the unit remove?

What kind of refrigerant do we use?

What is the max capacity for the refrigeration unit?

125 = 80% capacity @ what temperature?

What is the cooling water gallon requirements shipboard?

In the shipboard cooling water requirements at what temperature is the seawater?

What kind water system does the cryogenic school plant use?

What is the oil capacity for the sump?

What is the oil capacity for the oil receiver?

What is the total lubrication system capacity?

TRUE/FALSE

The oil used in the lubrication system is Capella oil WF32 (TEXACO) and Octagon compro 4.

What operating pressure is this?

Min: 180 psig

Max: 200 psig

Do not exceed: 250 psig (HPS)

What operating pressure is this?

Min: 20" Hg

Max: 24" Hg

Do not exceed: 25" Hg (LPS)

What operating pressure is this?

Min: 30 psig

Max: 65 psig

Do not exceed: 25 psig (on fall/OPS)

What operating pressure is this?

Min: 3 psig

Max: 10 psig

Do not exceed: 20 psig

What operating pressure is this?

Min: 35 psig

Max: 50 psig

Do not exceed: n/a

What operating temperature is this?

Min: 180°F

Max: 235°F

Do not exceed: 240°F (HDTS)

What operating temperature is this?

Min: -35°F

Max: 15°F

Do not exceed: n/a

What operating temperature is this?

Min: 100°F

Max: 145°F

Do not exceed: 160°F (HOTS)

What operating temperature is this?

Min: -65°F

Max: -50°F

Do not exceed: -70°F (on fall)

What operating temperature is this?

Min: 70°F

Max: 100°F

Do not exceed: n/a

NAME. THIS. COMPONENT.

Physical Appearance: n/a

Location: Attached to the motor on a skid.

Construction Features: The refrigeration ___ is a two stage reciprocating, internally compounded unit. Made up of multiple components.

Functional Operation: Gas enters through suction filter as a low pressure superheated gas, entered the first cylinders from the inlet suction chamber/filter, and is compressed to 7-8 psig. Gas is discharged into an external interstage pipe which connects the first stage discharge and second stage suction chambers. Compressed refrigerant gas is directed to the second stage for further crompession, discharged from second stage as a high temp/high pressure gas at approximately 200 psig and 210°F. Serves as the driving force for there refrigerant and oil circulation.

NAME. THIS. COMPONENT.

Physical Appearance: n/a

Location: Mounted on skid.

Construction Features: Cast steel.

Functional Operation: Serves as oil sump, houses all internal parts.

NAME. THIS. COMPONENT.

Location: Inside compressor housing.

Construction Features: 2 throw crankshaft, internally drilled oil passages which lubricate connecting rods/bearings and drive end bearings, 2 crankshaft bearings, 1 single sleeve bearing on oil pump end, 1 single sleeve thrust bearing on drive end, mechanical sleeve n motor

Functional Operation: Changes rotary motion of drive motor to reciprocating motion of the pistons

NAME. THIS. COMPONENT.

Location: Inside compressor housing.

Construction Features: Cylindrical, o-ring seals bottom, metal to metal seal on top.

Functional Operation: Provides sealing surface for piston to compress against.

NAME. THIS. COMPONENT.

Location: Attached to crankshaft inside housing.

Construction Features: 2 piece rabbit lined bearing on crankshaft end, roller needle bearing on wrist pin end, wrist pin.

Functional Operation: Transforms rotary motion of the crankshaft to reciprocating motion of the pistons.

NAME. THIS. COMPONENT.

Location: Attached to connecting rod inside housing.

Construction Features: Concave piston top, 2 compression rings, 1 oil wiper ring, connected to con rod with a wrist pin.

Functional Operation: (1st stage: 6, 2nd stage: 2) Compresses low pressure refrigerant gas to 7-8 psig, compresses low pressure refrigerant gas to high pressure refrigerant gas at 180-200 psig.

NAME. THIS. COMPONENT.

Location: Mounted on top of housing under compressor heads.

Construction Features: Spring loaded, consists of springs, ___ plate, ___ seat, ___ cage.

Functional Operation: On inlet stroke, piston is drawn down, suction opens, overcoming spring tension. On compression stroke, suction is forced closed, discharge opens overcoming spring tension.

TRUE/FALSE

High and low pressure valves are essentially the same except the pressure capacity.

NAME. THIS. COMPONENT.

Location: Inside housing.

Construction Features: Filter is wire mesh with another fine screen inside, chamber is internally ported inside the compressor housing.

Functional Operation: Filter removes small particles that may enter comp, suction chamber evenly distributes refrigerant to pistons.

NAME. THIS. COMPONENT.

Location: After oil separator.

Construction Features: Horizontally mounted, two pass, tube and shaft, heat exchanger.

Functional Operation: Seawater circulates through the tubes, hot refrigerant gas circulates around the tubes, seawater absorbs the hear from the hot refrigerant gas, cooling and condensing it, seawater enters at the bottom and exits at the top

NAME. THIS. COMPONENT.

Location: In the sea water outlet piping of the condenser.

Construction Features: Valve body with inlet, outlet, and valve seat, bellows, bellows pushrod and capillary tubing, adjusting spring and range screw.

Functional Operation: Automatically adjusts seawater flow through the condenser to control discharge pressure between 180-200 psig. Capillary tube transmits pressure to the WRV., increasing pressure acts on the bellows causing the valve to open, decreasing pressure allow spring tension to overcome bellows allowing valve to close.

NAME. THIS. COMPONENT.

Location: In line after condenser.

Construction Features: Horizontal vessel, fitted with a mechanical liquid level indicator, capacity 125 lbs of R-22

Functional Operation: Used as a reservoir for liquid refrigerant, allows pup down of system for shutdown, maintains liquid seal prior to expansion valves.

NAME. THIS. COMPONENT.

Location: In the main liquid refrigerant line after receiver.

Construction Features: Cylindrical shell with a moisture indicator located in the cap, two replaceable desiccant cartridges, activated alumina or alumina silicates.

Functional Operation: Moisture is adsorbed and contaminates filtered out.

Dehydrator indicator color for SAT?

Dehydrator indicator color for UNSAT?

NAME. THIS. COMPONENT.

Location: Installed in refrigerant liquid line piping prior to solenoid or TXV's.

Construction Features: Brass shell containing fine screen cartridge, removable for cleaning.

Functional Operation: Removes foreign particles from the liquid refrigerant and oil streams.

What strainer valve is for the oil cooler?

What strainer valve is for the oil receiver?

What strainer valve is for the hot gas bypass?

What strainer valve is for the inter-cooler?

What strainer valve is for the evaporator?

NAME. THIS. COMPONENT.

Location: Located before each expansion valve.

Construction Features: Two way, normally closed, internal, pilot operated with a manual override, single acting, solenoid coil, includes jacking screw for manual operation.

Functional Operation: Used to stop and start liquid flow throughout the refrigeration system, when energized, current flow through the coil and produces a magnetic field which lifts the plunger, unseating the valve disc, permitting flow through the valve.

NAME. THIS. COMPONENT.

Location: Y-58 evaporator, Y-56 inter-cooler, Y-54 oil cooler

Construction Features: Power head assemble contains diaphragm and thermal bulb assembly, cage assembly contains closing spring, seat and sic, valve body

Functional Operation: Controls quantity of refrigerant admitted to the evaporator, inter-cooler, and oil cooler

NAME. THIS. COMPONENT.

Location: Diaphragm globe valves are installed in the refrigerant and lubricating oil piping, installed on the producer.

Construction Features: Upper stem, diaphragm, spring and lower stem, upper portion of each valve is sealed form the lower portion by a diaphragm, utilizes a needle type seat and disc for precise control of flow.

Functional Operation: As upper stem in raised, lower stem is lifted by spring tension, lifting permits flow through valve. Directs refrigerant into evaporator when operation demands bypassing the installed TXV or when the TXV fails.

What kind of valve directs refrigerant into evaporators when operation demands bypassing the installed TXV or when TXV fails?

NAME. THIS. COMPONENT.

Location: Next major component after receiver.

Construction Features: Double pipe coil, tube within a tube.

Functional Operation: Supplies sub-cooled liquid refrigerant to the evaporator TXV, and cold gaseous refrigerant to the compressor inter-stage piping to control inter-stage temp and pressure. High pressure liquid refrigerant flows through the inner tube. Expanded low pressure refrigerant vapor flows in the space between the inner and outer tube. Expanded refrigerant adsorbs heats from the high pressure liquid in the tube, sub cooling the high pressure liquid prior to reaching the evaporator TXV.

NAME. THIS. COMPONENT.

Location: Inside the O2N2 producer cold box.

Construction Features: Helically wound tube, making a single pass through a cylindrical shell.

Functional Operation: High pressure air flows through the tube, low pressure/low temp liquid refrigerant is admitted to the shell from the evaporator TXV. Liquid refrigerant adsorbs the heat from the process air stream and vaporizes into a super heated vapor.

NAME. THIS. COMPONENT.

Location: Installed between the compressor discharge to the condenser and the liquid refrigerant inlet to the temperature.

Construction Features: Spring loaded diaphragm type valve, externally equalized expansion valve.

Functional Operation: Allows hot refrigerant gas from the inlet of the condenser to flow into the evaporator increasing the gas flow back to the compressor in the event of a low heat load conditions. Maintains the evaporator pressure between 18.5" and 19.5" Hg vacuum.

NAME. THIS. COMPONENT.

Location: After the evaporator, installed in the compressor suction line.

Construction Features: Cylindrical vessel, two sight glasses, oil drain line.

Functional Operation: Prevents occasional slug of liquid refrigerant or oil from reaching the compressor suction, sight glasses installed on the trap provide visual indication of liquid flood back and oil level, oil with entrained refrigerant is drained from the suction trap to the oil receiver.

NAME. THIS. COMPONENT.

Location: RV-1 on suction temp, RV-2 between receiver and condenser, HP internal inside 2nd stage discharge of compressor head.

Construction Features: Held closed by a spring at a preset pressure.

Functional Operation: RV-1 protects suction trap from excessive pressure, opens at 300 psig, vents to atmosphere. RV-2 protects receiver from excessive pressure in event it is fully secured, opens at 300 psig and vents back to the condenser.

NAME. THIS. COMPONENT.

Location: Y-1 compressor suction valve, Y-2 compressor discharge valve, Y-11 suction trap inlet valve.

Construction Features: Valve handle, bonnet, stem packing gland, packing nut, seat and disc

Functional Operation: Starts or stops flow by opening or closing, these valves have stem packing which must be loosened prior to opening or closing valve, always back-seated when open

NAME. THIS. COMPONENT.

Location: In line after compressor and before condenser.

Construction Features: Cylindrical vessel with internal packing, shell contains the inlet, outlet, oil drain line, and vent.

Functional Operation: Removes lubricating oil entertained in the refrigerant gas flow from the compressor, recovers oil is directed to float regulating valve assembly, oil/refrigerant mixture goes in, oil drains out, pure refrigerant gas goes on to the condenser.

NAME. THIS. COMPONENT.

Location: Between oil separator and oil receiver.

Construction Features: Body contains inlet, outlet and vent line, ball float and needly valve assembly

Functional Operation: Regulates the flow of oil into the oil receiver, oil drains from oil separator into valve body, as the oil level in the float rises, the float valve opens and system discharge pressure forces the oil into the oil receiver.

NAME. THIS. COMPONENT.

Location: Between float regulator valve and compressor.

Construction Features: Cylindrical vessel with three emersion heaters, two sight glasses, internal sight glasses, capacity is 4 gallons.

Functional Operation: Collecting point for oil from oil separator and suction trap, allows residual refrigerant to boil off from oil. Uses three submersion type heating elements cause entrained refrigerant to boil off from the oil before it is returned to the compressor

NAME. THIS. COMPONENT.

Location: In the compressor sump.

Construction Features: Ball float, float seat assembly.

Functional Operation: Controls flow of oil from the oil receiver to the compressor sump, float opens valve allowing oil to flow form receiver to sump as the oil level drops.

NAME. THIS. COMPONENT.

Location: External to compressor.

Construction Features: Tube & shell, thermal expansion valve

Functional Operation: Oil circulates through shell and is cooled by refrigerant flowing through the oil tube, oil is sent to drive end housing after cooled, SOL-2 opens mechanically at 135°F.

NAME. THIS. COMPONENT.

Location: Inside the compressor sump on oil pump suction piping.

Construction Features: Fine wire screen type oil strainer.

Functional Operation: Removes foreign particles from oil stream.

NAME. THIS. COMPONENT.

Location:Inside compressor rear bearing head, opposite the drive end.

Construction Features: Directly connected to the crank shift.

Functional Operation: External suction tube connects oil pump to oil strainer, oil from pump flows in 2 directions, some returns to oil cavity in pump end bearing heat and to a drilled passage in the crankshaft and connecting rod bearing, remaining oil flows through oil cooler to seal cavity on drive end of compressor, cavity is pressurized to provide lubrication of drive end bearing.

NAME. THIS. COMPONENT.

Location: Mounted on the bulkhead near the unit.

Construction Features: Potential transformer, AC relays, timing relay, indicator lights, power supply, contractor, thermal overload relays, pushbuttons, elapsed time meter.

Functional Operation: Controls and indicated the refrigeration unit status during operation.

NAME. THIS. COMPONENT.

Location: Coupled to compressor

Construction Features: Air cooled, squirrel cage, rated @ 50 HP, induction type

Functional Operation: Motor drives the compressor through a flexible coupling 1750 rpm, flexible coupling permits slight parallel and angular misalignment.

NAME. THIS. COMPONENT.

Location: Crankcase heater HT-1, receiver heaters HT-2, HT-3, & HT-4

Construction Features: 115 VAC Heater Elements

Functional Operation: HT-1 is energized when the compressor motor is not running, HT-2 thru HT-4 are energized and de-energized by the oil receiver thermostatic switch. Vaporizes refrigerant entrained in the oil in the receiver.

What pressure switch is this?

-Compressor discharge

-Opens @ 250 psig +/- 5 psig

-Resets @ 200 psig +/- 5 psig

What pressure switch is this?

-Compressor suction

-Opens @ 25 Hg +/- 1 Hg

-Closes @ 18 Hg +/- 1 Hg

What pressure switch is this?

-Condenser seawater outlet pressure

-Opens @ 3 psig +/- 0.5 psig

-Resets @ 12 psig +/- 0.5 psig

NAME. THIS. COMPONENT.

Location: Mounted on the instrument board.

Construction Features: Single pole/single throw, two bellows

Functional Operation: Prevents compressor from operating with the loss of oil pressure.

At what point on the differential pressure switch (DPS) will is close the contacts?

At what point will cause the contacts to open with a differential pressure switch (DPS)?

At what temperature will the HDTS cause the contacts to open?

NAME. THIS. COMPONENT.

Location: Mounted near the instrument board, high discharge temperature switch, high oil temperature switch

Construction Features: Similar to pressure switch but have a closed thermal bulb at the sensing location instead of pressure connections, single pole/single throw, fluid filled thermal bulb

Functional Operation: Thermal bulb contains a fluid that expands when the temperature rises, fluid pressure expands the bellows to actuate the switch mechanism.

At what temperature will the HDTS cause the contacts to close?

At what temperature will the HOTS cause the contacts to open?

At what temperature with the HOTS cause the contacts to close?

NAME. THIS. COMPONENT.

Location: Mounted on the oil receiver

Construction Features: Single pole/double throw, bellows actuated

Functional Operation: Controls the oil receiver heater and SOL-2

(ORT switches) At what temperature do the high temperature contacts close to engerize SOL-2 and de energize the heater?

(ORT switches) At what temperature do the low temperature contacts close to engerize HT-2 thru HT-4 and de-energizing SOL-2?