Thread: The end of cruise ships, as we know them?

Duplicate.

Originally Posted by 101RRS

Same with the Ruby Princess - source was an infected kitchen hand who spread it around initially via handling food (I guess coughing over it as well).

Garry

Yes, the problem was that the Japanese health authorities badly stuffed up and didn't test the staff who were doing the cooking while the ship was under quarantine - so although passengers were confined to their rooms, the trays that the food was being delivered to their rooms on were contaminated. Incompetence, plain and simple.

Originally Posted by bob10

A fascinating chapter of maritime air conditioning is submarine air conditioning. I had a mate who was chief of the boat on Otama, back in the day, and had the opportunity to get a rub around on the air conditioning on the boat, reason being I had volunteered for submarines, and wanted a heads up , so to speak. My memory is not good enough for an in depth description, but here is a reasonable explanation.

Submarine Refrigeration and Air-Conditioning Systems - Chapter 19

I notice that reference is made to both the fans and compressors being "speed controlled" and also mentions a rheostat. I guess that these things were built long before SCR variable speed drives were in common use, so I suppose the motors were DC?

Originally Posted by bob10

I ended up not joining the submarine service, I had the interviews and had done the psyche test [ I was considered mad enough] but as with most things, a woman came along, and changed my mind. It was the best thing as it turns out because I was posted to Darwin, and the Patrol Boat stream. At that stage Submarines and Patrol Boats were considered to be the only part of the Navy actually engaged in " active" service, so to speak.[ probably only by their crews] The Submarines were spying on Russia and China, the Patrol Boats were involved with policing the Australian fishing grounds, and that was full on, a story in itself. After Vietnam, service in the destroyers became mundane, peace time cruising, or so it seemed. Anyway, I believe I made the right choice as service In the Patrol Boats was busy and full on enough to keep me happy. However, I have this;

C.F. 'O' CLASS SUBMARINESMISCELLANEOUS SYSTEMS AND EQUIPMENT PART 4. - AIR CONDITIONING, VENTILATION AND REFRIGERATION 9.41 INTRODUCTION Air conditioning machinery is fitted to regulate the temperature and humidity of the air in the submarine. Cool dry air is distributed throughout the ship to create comfortable living conditions and to provide the best operating conditions for certain electronic equipment. A. Description 1. Supply Two air conditioning plants are fitted, both in the ACS. The forward plant supplies refrigerant to a Main Air Treatment Unit, and the after plant supplies refrigerant, through a FREON MAIN, to 13 air treatment units (SPOT COOLERS) situated in selected positions throughout the ship. A steel ventilation trunking runs from the main air treatment unit, up into the CR flat and forward into the F.T.R. Two 10" x 6" fans take a suction over the Main Air Treatment unit where the air is cooled and dried, and discharge into the trunking. Branches from this trunking run into messes, bunk spaces, machinery compartments, stores etc., and it can be shut off where it passes through bulkheads. For heating purposes, two 7KW electric heaters are fitted on the discharge side of the 10" x 6" fans. (Fig. 8) Another fan, a 9" axial flow, takes a suction from the vicinity of the ER door and discharges into another trunking, over a double spot cooler installed in the trunking and into the A.T.R. (Fig. 7) The remainder of the spot coolers have their own fans and cool in their own immediate vicinity. They are also fitted with electric heaters. (Fig. 6)

9-16

9-17

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Ventilation System (Supply) Layout in ACS and AMS Fig 8 (Ojibwa Only)

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Ventilation System-(Exhaust) Fig 9 (Ojibwa Only)

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VENTILATION SYSTEM (EXHAUST) FIG 10 Layout in AMS/ACS (Ojibwa Only)

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VENTILATION - SUPPLY AND EXHAUST - SS 73 & 74 FIG 11

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9.41 INTRODUCTION (CONTD)A. Description (Contd) 2. Exhaust Three exhaust fans are fitted to discharge stale air back into the ACS: (Fig. 10)(1) 10" x 3" from Galley, W.T. Annex, Bathrooms, WCS (2) 10" x 3" from Gyro Room, W.T. office, Radar Equipment (3) 7 1/2" from S. R. bathroom and Sound Room. (See Fig. II for layout on SS 73 & 74) 9.42 REFRIGERATION For the preservation of foodstuffs for long periods, refrigerating machinery is fitted to supply: 1. Cold Cupboard - to hold foodstuffs to be frozen. Situated in the After Starboard corner of the ACS. 2. Cool Cupboard - to hold foodstuffs to be cooled. Situated immediately forward of the Cold Cupboard in the ACS. 3. Deep Freeze Unit - to hold foodstuff requiring additional cooling. Built into the Cold Cupboard. The Cold and Cool Cupboards are cooled by refrigerating machinery situated on the forward bulkhead of the Cool Cupboard. The Deep Freeze Unit is cooled by refrigerating machinery located in the vegetable locker. One self contained domestic type refrigerator is situated in the passageway outside the Senior Rates Mess, it is used by all messes. The machinery is automatic in operation and willmaintain the temperatures of the cupboards within the following limits:

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FIG 12 BULKHEAD VALVE

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9.42 REFRIGERATION (CONTD)a. Cold Cupboard 8°F - 14°F b. Cool Cupboard 36°F - 44°F c. Deep Freeze -10°F - 0°F Temperature Gauges for the Cold Cupboard, Cool Cupboard and Deep Freeze Unit are situated in the ACS and are to be checked every hour. In harbour these readings are to be recorded on the "below decks check off list" and at sea they are recorded in the Engine Room Register. Cooling water from the refrigerating and air conditioning machinery is supplied from the After Services System, via the forward services using a power operated supply valve.

Thats fantastic info.

Just imagine crawling around with an old halide lamp leak detecter looking for a leak,bloody pipes and little units everywhere.

or maybe just soap and bubbles if the flame was not allowed.

I know this is a really dumb question I already regret asking, but if the submarine AC is recirculating the same air over and over, doesn't the air eventually go stale, or whatever the technical term is?

I believe they use scrubbers. Same principle as on manned space flights.

Life Support - How Submarines Work | HowStuffWorks

Originally Posted by Old Farang

I notice that reference is made to both the fans and compressors being "speed controlled" and also mentions a rheostat. I guess that these things were built long before SCR variable speed drives were in common use, so I suppose the motors were DC?

I found this in the info,Compressers,

" Drive, by 5 V-belts from a two-speed 4.9- to 4.1-hp electric motor, 250 (175-345) volts direct current (d.c.)."

They are Yorks running at 330RPM,R12,bloody amazing.Sould go for ever at that speed.

Use Back pressure regulators for the AC units,haven't seen one of those for a while,the young blokes wouldn't have a clue what they are.
Remember the old ice-cream/milk cabinets,with them....LP set at one pound,BPR valve at about maybe 26 or 28PSI at a guess,so the milk won't freeze.

I didn't realise if you go to bottom of page and click on the pages at the very bottom,there is heaps of interesting info.

Use Back pressure regulators for the AC units,haven't seen one of those for a while,the young blokes wouldn't have a clue what they are.
Remember the old ice-cream/milk cabinets,with them....LP set at one pound,BPR valve at about maybe 26 or 28PSI at a guess,so the milk won't freeze.

And what mongrel POS they were! The only one that I ever came across was on an oil rig where they used the same compressor rack for both chiller and freezer. Far to complicated for that application, it should never have been installed. Both refrigeration and air conditioning, along with countless other systems had to be maintained by just one "electrician", and I use that description sparingly, as most of them had only been to a 1 week course before becoming "fully qualified"!