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Post by quaysider on Jun 11, 2016 8:00:59 GMT
I can't work out what the difference is - Google is being useless, just giving me "sales options"... Thing is, a 400 litre baffled tank on leesan website is 244 quid... link
where as a 340 litre one is 343.22 quid ... linkWHY? - I ask because I'm trying to work out how big a one I can get under the bed and obviously want the biggest one possible . Any ideas folks? |
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Post by smileypete on Jun 11, 2016 11:39:53 GMT
Well I'm just as baffled as you are!
Joking aside, why not have a look at their PDF catalogue, it gives a better idea of what a baffled holding tank looks like, and all the sizes together. Looks like the 400 litre tank maybe the sweet spot for having one installed under a bed.
Could also be worth considering a separating composting loo as these are getting more popular, I believe peterboat has one.
If you're live aboard, could even consider a separating loo bowl connected to a holding tank to extend the pump out intervals.
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Post by phil70 on Jun 11, 2016 13:01:59 GMT
Why not have one made, Goodwin Plastics will make one to your exact spec, any shape, whatever fittings, threads etc and they fit baffles. I had them make an auxillary fuel tank for my last boat not expensive either.
Phil
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Post by quaysider on Jun 11, 2016 13:25:19 GMT
it's the "baffled bit" that baffles me...
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Post by PaulG2 on Jun 11, 2016 13:34:38 GMT
it's the "baffled bit" that baffles me... I'm a bit baffled...... Are you just having fun with words or do you really want to know the how and why of baffled tanks? |
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Post by quaysider on Jun 11, 2016 14:00:16 GMT
*stands in the dunces corner*... it's the how and why I'm after...
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Post by PaulG2 on Jun 11, 2016 15:26:38 GMT
Baffles in a tank are like walls inside the tank that have openings in them and may or not fit snugly against the bottom (floor) or top of the tank. the reason they are there is because, without baffles, the liquid in the tank can move back and forth, side to side or end to end, and this can cause a tremendous amount of weight to be shifting back and forth inside the tank, which can then adversely affect the handling of the vehicle or boat that contains the tank.
100 gallons of water weighs about eight hundred pounds. Imagine what an eight hundred pound person moving side to side on your boat would do to the boat. The baffles in the tank keep the liquid from moving around so much inside the tank.
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Post by quaysider on Jun 11, 2016 16:08:22 GMT
ah - that makes sense... although if they are better (which they sound to be), why are the baffled tanks cheaper than the others? - more chance of it "blocking" from not fully macerated waste?
I wonder if the volumes quoted don't take into account the room the "walls" take up?
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Post by PaulG2 on Jun 11, 2016 16:26:53 GMT
ah - that makes sense... although if they are better (which they sound to be), why are the baffled tanks cheaper than the others? - more chance of it "blocking" from not fully macerated waste? I wonder if the volumes quoted don't take into account the room the "walls" take up? I'm just guessing, but a baffled tank would be structurally more sound than a non-baffled one with no interior support, so the baffled tank could be made of less plastic. The volume of the walls is negligible. The walls are made of the same stuff as the main tank, maybe even a little thinner with extrusions for strength. If you have one wall every 1', how many would you have in the tank you are looking at - 2 or 3? |
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Post by smileypete on Jun 11, 2016 16:27:01 GMT
ah - that makes sense... although if they are better (which they sound to be), why are the baffled tanks cheaper than the others? - more chance of it "blocking" from not fully macerated waste? I wonder if the volumes quoted don't take into account the room the "walls" take up? I guess price may be down to production volumes. As Phil says a local supplier may be able to do a custom one for a good price. On a rotomoulded tank the baffles will probably be moulded in as slots, like shown in the PDF. The downside of rotomoulded is that they only do certain sizes.... |
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Post by PaulG2 on Jun 11, 2016 16:59:27 GMT
Finally found the pdf. I like this site, but the links here suck. They don't seem to want to underline, even if you try to do it manually. Anyway, I see what you mean about the moulding style. I suppose that makes sense from an ease of production standpoint. If you don't need the missing volume, it's as good a design as any.
I see a lot of service vehicles and trailers around here with plastic tanks with interior baffles, just like a steel stank would be made. Whatever suits your purpose, and is available is what's important.
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Post by smileypete on Jun 11, 2016 17:30:45 GMT
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Post by smileypete on Jun 11, 2016 18:03:20 GMT
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Post by quaysider on Jun 11, 2016 20:02:41 GMT
I've sent an email to Goodwins with a link to the leesan 400 litre one... asking nicely if they can make one for less money - their website seems "human" if you follow so you never know.
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Post by quaysider on Jun 12, 2016 12:24:14 GMT
well what do you know -I was spot on with my comment about thier website bieng human... in that I've recevived an email reply this morning :
Morning Mark,
Thank you for your contact, but sorry we can't beat the price, but would be able to match it.
If you wish to place an order we would need a drawing showing the sizes required and also the position and size of the fittings that you require.
Kind Regards
Jason Goodwin
In that case, I may as well buy from HIM - I like people who (like me) often work on a weekend!
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