Home |
Search |
Today's Posts |
#21
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
Bob wrote:
:On Oct 11, 6:40 am, Martin Baxter wrote: : There are people that are allergic to aluminum, and there are health : risks of excessive aluminum consumption. But you get more aluminum : from a couple of antacids than you do from years of drinking out of a : water tank. : : Not to mention skin absorption from antiperspirants, sun block, : moisturizers........ : Cheers : Marty :Hi All...... :Ya I guess I your right. Really cant argue against, "we are exposed to :lots of it so it cant be harmful." Pretty air tight case Id say. Maybe :we should also use that argument for lead and mercury. We could go :back to lead water supply pipes and using mercury as a medicine. Aluminum is the third most common element in the Earth's crust. Nearly everything you've ever eaten has contained aluminum. That probably includes the water out of your fancy stainless steel water tank, by the way. Atmopsheric dust also contains large amounts of it. |
#22
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
Bangkok Bruce replied to a few people:
Interesting as most of the 3rd world cooks using aluminum pots and alzimers (which was one of the most common ailments attributed to aluminum) doesn't seem to be a major problem. As someone who years ago traveled extensively in other countries (and even lived in a few) I found that the populations of poorer areas usually ate food - not the stuff some factory belches out or is raised on a diet of chemicals, but things grown from the ground or raised on it eating what is growing on it. Alzheimer's is believed to be caused by an amaloid protein, and aluminum is usually found in high concentrations in brains of its victims, but unless things have changed in the last year since I've read about it it is not believed to be a cause, just a symptom so far. Since aluminum is found often in potable water and in many foods in varying concentrations and yet is not usually found in the brains of healthy people, I would have to believe that aluminum gets into the brain because you are already doing something stupid - like chronically eating chemical laden and processed foods (the ones the medical community in the US keeps saying is safe for you), or doing something else that invites the aluminum past the normally impenetrable (by alum.) blood-brain barrier. Red |
#23
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
Its so easy to put in access ports in an aluminum tank. Cut a square
hole, get 2"wide aluminum strips the same gage as the tank walls and install as a sister flange using bolts as attachment studs, epoxy coat the sister flange to the tank and then simply line everything, the original cut out square used as the closure manhole/handhole. The typical 100 gallon square tank in most boats are such that a human arm can reach entirely across to the other side from an access port. Honestly did you ever see a LARGE access port on a rotomolded tank that didnt cost almost as much as the tank without an access port? Without access ports there is NO way to get inside and mechanically scrub off any biofilm (calcyx) ... and if there there is any calcyx remaining, simple sanitization methods simply will not work. Access port ARE simpler easier and cheaper to install /add to an aluminum tank. Mmmmmmmm most ballfes in fabricated metal tanks inthe marine industry typically only have 5%-10% of the projected cross section open to prevent 'sloshing' . A rotomolded tank would probably consist of mostly deep Vs to accomplish the same. A rotomolded tank with the typical baffle area and baffle 'exit' area form by deep Vs would be absolutely preposterous while having little useful internal volume in comparison. Sorry. :-) problem is on a normal baffeled tank of any size (under the size a man can crawl thru the baffles) is painting it with a brush or roller is next to impossiable, unless the tank has an inspection/work port in every space between baffles. It's a great way to go if your building tanks but expensive to do right. And roto mold tanks can and do have baffles. They are made by molding deep V's into the sides of the tanks. Joe |
#24
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
On Thu, 11 Oct 2007 16:28:33 -0000, Bob wrote:
On Oct 11, 6:40 am, Martin Baxter wrote: There are people that are allergic to aluminum, and there are health risks of excessive aluminum consumption. But you get more aluminum from a couple of antacids than you do from years of drinking out of a water tank. Not to mention skin absorption from antiperspirants, sun block, moisturizers........ Cheers Marty Hi All...... Ya I guess I your right. Really cant argue against, "we are exposed to lots of it so it cant be harmful." Pretty air tight case Id say. Maybe we should also use that argument for lead and mercury. We could go back to lead water supply pipes and using mercury as a medicine. You know, I wonder whether we aren't overdoing this terror of lead, Mercury, zinc, this and that? A couple of examples: When I was in high school I worked a couple of summers for the Vermont Forest Service and one of the projects was to re-shingle the barn roof on the Calvin Coolidge homestead. The house was pretty well run down by this time but we camped out in one room and cooked there. We found that the water pipe from the spring, out back, to the kitchen was a lead pipe. Since, as far as I know Calvin was born and raised in that building he drank lead tainted water throughout his childhood. Seemed to do all right in later life. When I was a youngster my mother was a fanatic about oral health so I have fillings that date back to the 1940's - made with "amalgam" a mixture of silver and mercury. Don't seem to have developed any strange symptoms in the years since. This is not to say that I advocate drinking lead paint, sniffing zinc fumes or anything like that but I do believe that this fear of any exotic metals is carried to extremes. Bruce in Bangkok (brucepaigeATgmailDOTcom) |
#25
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
On Thu, 11 Oct 2007 04:21:11 -0000, wrote:
There are people that are allergic to aluminum, and there are health risks of excessive aluminum consumption. But you get more aluminum from a couple of antacids than you do from years of drinking out of a water tank. Hey there, Its not the same stuff It's not? What exactly is the difference? Casady |
#26
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
On Oct 13, 5:24 am, (Richard Casady)
wrote: On Thu, 11 Oct 2007 04:21:11 -0000, wrote: There are people that are allergic to aluminum, and there are health risks of excessive aluminum consumption. But you get more aluminum from a couple of antacids than you do from years of drinking out of a water tank. Hey there, Its not the same stuff It's not? What exactly is the difference? Casady Look, I got better things 2 do bsides gettin n 2 alchemry wit ya. go chew on an aluminium tank maybe 5053 aloy and then swallow a Tums............. uhh, which dont have Al in it. The dif??? go back to CHEM 201. O, ifeel a hard 1 commmin down the pike...........gotta go. |
#27
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
On Sun, 14 Oct 2007 04:45:17 -0000, Bob wrote:
On Oct 13, 5:24 am, (Richard Casady) wrote: On Thu, 11 Oct 2007 04:21:11 -0000, wrote: There are people that are allergic to aluminum, and there are health risks of excessive aluminum consumption. But you get more aluminum from a couple of antacids than you do from years of drinking out of a water tank. Hey there, Its not the same stuff It's not? What exactly is the difference? Casady Look, I got better things 2 do bsides gettin n 2 alchemry wit ya. go chew on an aluminium tank maybe 5053 aloy and then swallow a Tums............. uhh, which dont have Al in it. The dif??? go back to CHEM 201. O, ifeel a hard 1 commmin down the pike...........gotta go. I take that to mean: 'there is no difference'. Casady |
#28
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
On Oct 2, 7:41 pm, Jere Lull wrote:
On 2007-10-02 15:40:40 -0400, druid said: I've always seen plastic watertanks, but the boat I'm buying has an old aluminum one (I think it's alum: it's metal, and not SS). Is there any advantage to alum over plastic or vice-versa? I'm planning on replacing it with a bigger one, and first I thought plastic, but should I consider aluminum instead? I've always disliked the "plastic" taste in the water from a plastic tank. I prefer aluminum over plastic and wouldn't replace a perfectly good tank with a bigger one, but would add tanks in otherwise unused corners of the boat. (Wow - I really started a war on this one - sorry!) All things being equal, I'd agree: add a tank rather than replace. However, this is a 28-ft boat and there aren't a lot of options. The existing tank is cylindrical, with no access port. And it's sitting under the V-berth, where there's lots of room for more tanks.... if this was was taken out. So my Plan is to remove the existing tank, put in a platform where the old tank was, and put in His'n'hers water and holding tank. I can't do that without removing the existing tank (which sounds like not a bad idea anyway: better safe than sorry for an unscrubbable, un-lineable aluminum tank!) druid "Coatue" Crown 28 |
#29
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
|
#30
posted to rec.boats.cruising
|
|||
|
|||
Water tanks - alum or plastic?
On 2007-10-15 11:41:21 -0400, druid said:
On Oct 2, 7:41 pm, Jere Lull wrote: On 2007-10-02 15:40:40 -0400, druid said: I've always seen plastic watertanks, but the boat I'm buying has an old aluminum one (I think it's alum: it's metal, and not SS). Is there any advantage to alum over plastic or vice-versa? I'm planning on replacing it with a bigger one, and first I thought plastic, but should I consider aluminum instead? I've always disliked the "plastic" taste in the water from a plastic tank. I prefer aluminum over plastic and wouldn't replace a perfectly good tank with a bigger one, but would add tanks in otherwise unused corners of the boat. (Wow - I really started a war on this one - sorry!) Nothing to be sorry about. The thread ceased to be about the subject very early. All things being equal, I'd agree: add a tank rather than replace. However, this is a 28-ft boat and there aren't a lot of options. The existing tank is cylindrical, with no access port. And it's sitting under the V-berth, where there's lots of room for more tanks.... if this was was taken out. So my Plan is to remove the existing tank, put in a platform where the old tank was, and put in His'n'hers water and holding tank. I can't do that without removing the existing tank (which sounds like not a bad idea anyway: better safe than sorry for an unscrubbable, un-lineable aluminum tank!) druid "Coatue" Crown 28 Xan's also a 28, but we have so many unused corners, I forget that not all boats do. (diagram on Xan's "interior" pages doesn't quite show all our stowage.) I'd say get Peggie Hall's book on sanitation, of course, and suggest that you double the size of the holding tank you envision (ours is 40 gallons and sometimes we have to leave anchorages early). I've come to agree with Ms. Head Mistress that the holding tank ideally should be in the bottom of the "V", with two large vents to either side of the hull for cross-flow. I like the water tank(s) to be as far away from the ends of the boat as possible -- while maintaining trim on the boat, so you may have to move something forward from the transom in the process. -- Jere Lull Tanzer 28 #4 out of Tolchester, MD Xan's pages: http://web.mac.com/jerelull/iWeb/Xan/ Our BVI trips and tips: http://homepage.mac.com/jerelull/BVI/ |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
cost of fabricating plastic holding tanks | Cruising | |||
Fuel and water tanks | Boat Building | |||
plastic fuel tanks | UK Power Boats | |||
Flexible water tanks? | General | |||
water and diesel tanks | Boat Building |