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Thread ID: 110687	2010-06-28 06:42:00	Water Tank Saga	Cicero (40)	PC World Chat

Post ID	Timestamp	Content	User
1114188	2010-06-29 10:33:00	There is no sign of any blockage,remember it emptied tank,then what happened, I know not. How empty? One set of instructions for big plastic tanks stressed that you need about a tonne of water in bottom (100mm) for stability.	PaulD (232)
1114189	2010-06-29 10:36:00	According to your link "Venting It is essential that you have more than adequate overflow and air venting for your operating conditions. Air and water must be able to exit the tank at the combined maximum rate that it can enter." Do you have an overflow doubling as a vent? The plumber only installed a 'height restictor' pipe, which works the same as an overflow. There is no other venting, but then again there is no venting on the tanks either. However the pressure of the pump, would draw water back up through the inlet pipe, to equalize it. I guess if air wasn't able to leave the tank, then water wouldn't be able to enter it either as it fills up from the roof. It is interesting, becuase potentially the same issue could happen to ours, if say someone leaves the tap on, and the inlet pipe gets blocked. I am not sure why ours doesn't have any venting built into it, as there is no other way to vent ours, at least your ones has got inbuilt vents.	robbyp (2751)
1114190	2010-06-29 10:49:00	The plumber only installed a 'height restrict' pipe, which works the same as an overflow. There is no other venting, but then again there is no venting on the tanks either. However the pressure of the pump, would draw water back up through the inlet pipe, to equalise it. I guess if air wasn't able to leave the tank, then water wouldn't be able to enter it either as it fills up from the roof. It is interesting, because potentially the same issue could happen to ours, if say someone leaves the tap on, and the inlet pipe gets blocked. I am not sure why ours doesn't have any venting built into it, as there is no other way to vent ours, at least your ones has got inbuilt vents. And the design has the two 60 mm vents and up till now has worked OK,having emptied tank on 2 other occasions. No mention of leaving water in tank in my instructions. It seems to me that they haven't considered all possibilities,I mean they should have vents of two sides of turret,so that there would be no possibility of blocking both side.	Cicero (40)
1114191	2010-06-29 11:01:00	No mention of leaving water in tank in my instructions. "Skellerup Rototanks stay put. 1,000 litres of water weighs 1 tonne, when installed and filled, a 25,000 Rototank weighs up to 25 tonnes. However, even when the tank is empty, because the outlet is approximately 105mm from the tank base,there is always enough water inside (appox. 1.1 tonne) to keep the tank stable.Instead of making tanks heavy, and therefore hard to install, we think it makes sense to use the natural weight of water to ensure stability.Above ground use only - Not to be buried." www.humes.co.nz	PaulD (232)
1114192	2010-06-29 11:10:00	Largely weight not an issue. Only happens when water timer fails and continues to pump after the alloted 1/2 requested. Happened 3 times over 5.5 years.	Cicero (40)
1114193	2010-06-30 05:05:00	Do you know if the pump is a "sucker" or "pusher". If the pump is mounted at the same level as the bottom of the tank water flows into the pump so does not need to suck, just push. If it is a pusher there is no vacuum on the inlet side.	jebby (4580)
1114194	2010-06-30 07:06:00	Do you know if the pump is a "sucker" or "pusher". If the pump is mounted at the same level as the bottom of the tank water flows into the pump so does not need to suck, just push. If it is a pusher there is no vacuum on the inlet side. Its a sucker,so no help there old fruit. I am going to have a go at insurance,it is thought that it should be covered,we will see.	Cicero (40)
1114195	2010-06-30 08:58:00	Don't know if this helps, but I read an article in "the Shed" magazine about water tanks and there was mention of the tank siphoning itself empty if there wasn't a holein the overflow pipe. Might have siphoned out and the two vents weren't letting air into the tank fast enough, there wouldn't need to be a big pressure difference to maybe do some damage. Mind you, looking at the pictures, the plastic seems to look quite faded where the collapse was	Whenu (9358)
1114196	2010-06-30 19:57:00	None of the above applies,but thanks for effort.	Cicero (40)
1114197	2010-08-30 04:10:00	And the outcome is,Insurance paying out. Two engineers couldn't decide on the cause,after much chin scratching.	Cicero (40)
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