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Old 03-01-2016, 03:30 AM   #43
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Quote; When the fire investigator came three days later he walked into the barn and said, “This is a nobrainer. This is the third Norcold refrigerator fire I have investigated in an RV this year and this looks identical to the other two.” He indicated that in the other two cases a detailed inspection found leaks in the copper tubing welds. :unQuote.


And I am also sure that the weak spot has nothing to do with "the tubing welds"
as the leaks almost invariably occurred in the bends of the piping due to rust !
I can hardly believe any Fire investigator would be so stupid to spout such dumb retherick (how do U spell that )

Ed
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Old 03-01-2016, 05:13 AM   #44
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Quote:
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Quote; When the fire investigator came three days later he walked into the barn and said, “This is a nobrainer. This is the third Norcold refrigerator fire I have investigated in an RV this year and this looks identical to the other two.” He indicated that in the other two cases a detailed inspection found leaks in the copper tubing welds. :unQuote.


And I am also sure that the weak spot has nothing to do with "the tubing welds"
as the leaks almost invariably occurred in the bends of the piping due to rust !
I can hardly believe any Fire investigator would be so stupid to spout such dumb retherick (how do U spell that )

Ed
again we dont know he said that ; this is the story passed around at the beginning of the class only we we see the ending .
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Old 03-01-2016, 02:06 PM   #45
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Dutchman.
To answer your question:
It's rhetoric.
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Old 03-02-2016, 01:24 PM   #46
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I have a 2005fleetwośd 39r dp. In the fridge compartment there are two ac plugins. The fridge was plugged into the one powered in shore power and the icemaker was in the one powered by the inverter. We do not use the ice maker due to camp ground water quality issues plugged the fridge into inverter power and do not think the electric heater of cooling unit can generate enough heat to cause a fire. Correct me please if I'm wrong. Also this way the fridge is powered at all times and no propane fire worries. Thanks
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Old 03-02-2016, 01:32 PM   #47
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I have a 2005fleetwośd 39r dp. In the fridge compartment there are two ac plugins. The fridge was plugged into the one powered in shore power and the icemaker was in the one powered by the inverter. We do not use the ice maker due to camp ground water quality issues plugged the fridge into inverter power and do not think the electric heater of cooling unit can generate enough heat to cause a fire. Correct me please if I'm wrong. Also this way the fridge is powered at all times and no propane fire worries. Thanks
Ok your wrong. Elect does make enough heat. Gas or elect makes no difference. Mine was on elect when it burned up.
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Old 03-02-2016, 02:53 PM   #48
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Ok thanks. Now have to figure out what caught fire because ammonia refrigerant is only combustible when exposed to open flame.
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Old 03-02-2016, 03:55 PM   #49
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RV Fridge
LP FLAME temp...........338*f to 374*f
120V AC element........320*f to 357*f


Overheating has contributed to 'RV Fridge' fires.....side walls, compartment building materials and electrical wiring
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Old 03-02-2016, 04:11 PM   #50
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Ok thanks. Now have to figure out what caught fire because ammonia refrigerant is only combustible when exposed to open flame.
I dont remember the exact details but there was a hydrogen element also.
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Old 03-02-2016, 06:58 PM   #51
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Ok thanks. Now have to figure out what caught fire because ammonia refrigerant is only combustible when exposed to open flame.
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I dont remember the exact details but there was a hydrogen element also.

RV Fridge Coolant solution:
Ammonia, Hydrogen Gas, Water, Sodium Chromate under 300 psi.

Leak in cooling unit:
hydrogen gas Psssfff---gone (quantity very small & very limited fire source)
ammonia Pssssffffff---gone except for lingering smell
water still in tubing above leak
sodium chromate still in water solution except for amount that got sprayed out of leak (it's the yellow residue---anti-rust inhibitor)

Atwood has a Helium Fridge.......swapped hydrogen for helium. Rest of ingredients same.
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Old 03-02-2016, 09:29 PM   #52
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needless to say whatever was burning was a very hot fire and white hot. 30 yrs fire rescue miami dade. Not a typical class a combustible.

Also I believe we have beat this horse to death so I'm done with this topic. adios.
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Old 03-02-2016, 11:26 PM   #53
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needless to say whatever was burning was a very hot fire and white hot. 30 yrs fire rescue miami dade. Not a typical class a combustible.

Also I believe we have beat this horse to death so I'm done with this topic. adios.
30 yrs working with high pressure steam/air/gas/fuel oil/water systems, hydrogen cooled generators, acid/caustic/ammonia systems and large chiller units.
Fought natural gas fires in oil field, fuel oil/lubricating oil fires NAVY on board ship at sea & fuel oil and 4KV Buss fires in powerplants.

RVs are just a rolling chemical lab and when lit they go FAST
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Old 03-02-2016, 11:58 PM   #54
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When the tubing develops a leak does the yellow residue (sodium chromate) alway appear?
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Old 03-03-2016, 06:40 AM   #55
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When the tubing develops a leak does the yellow residue (sodium chromate) always appear?
Not necessarily. Each situation is unique and different.

Dr4Film ----- Richard
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Old 03-03-2016, 01:43 PM   #56
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When the tubing develops a leak does the yellow residue (sodium chromate) alway appear?
Depends on WHERE leak occurs.

Majority of yellow residue is seen around burner area due to the 'weak ammonia solution' rising up thru perk tube (around burner stack).
Cracks occur at poor welds/over penetration of welds in thinner wall tubing and from the thermal cycling occurring in perk tube

And more cooling units fail not from leaks/cracks but from 'blockage' due to gravity flow being disrupted. Sodium chromate crystallizes when overheating occurs and plates out on the inside of tubing which results in more restrcitions to gravity flow...more overheating...more crystallizing----more plating out.........blocked tubing/no more cooling and no leaks happened.

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