gazmo88 said:
Tr: What idiot designs a part that is designed to be buried that does not accept pipe suitable for burial ?
Any attempted answer to your question exposes a lot of the problems within this industry.
The manufacturer of the underground diverter you linked is Rainharvesting. They are an innovative and leading Australian rainwater harvesting company who now have a presence overseas, particularly in the U.S.
The design of the underground diverter should never have included the use of a thin walled and non pressure rated 90mm PVC pipe for the flush chamber's drain. People do get confused with the different types of PVC pipe and their respective sizes but 'professionals' should know better.
It is also interesting when you look at the top LH chart on the linked page that gives the 300mm flush chamber's capacity per metre. Given that the internal diameter of 300mm DWV pipe is actually 294mm, the internal volume is actually 68 lpm.
The chart's notes also give the volume of 100mm DWV pipe as 8 lpm and yet further down the page on the bottom chart it is shown as 8.8 lpm. The internal diameter of 100mm DWV is 102mm, making its volume 8.2 lpm.
http://rainharvesting.com.au/products/pre-filtration/first-flush-water-diverter/in-ground-diverters
The problem is that mistakes are copied by other industry 'experts' and is why various manufacturers of first flush kits will claim that the lpm in a 90mm PVC pipe can be anywhere from 6.5 to 8 lpm. As the actual diameter is 86 mm, the lpm is a much lesser 5.8 lpm. Correct information is of importance to persons when setting up their rainwater harvesting systems.
It is a sad industry indictment when the people who design products that use pipes and fittings don't even know pipe types, volumes and applicable regulations.
There are a staggering number of non compliant products on sale in the majors as a casual walk through the big green shed will reveal. An even worse thing is that plumbers fit these products and issue compliance certificates which Joe Public also pays for. As an example, I know of a grey water unit (that attracts a $500 govt rebate) that is designed with an under sized (non compliant) outlet pipe. It can also be found at the big green shed.
A lot of the 'experts' have now gravitated to the solar industry.
Posted Wednesday 11 Jan 2012 @ 1:36:37 am from IP
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