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Unread 01/25/2013, 01:53 PM   #18
r-balljunkie
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Quote:
Originally Posted by Allmost View Post
well, to be honest, I own mostly Tunze stuff .... from osmolators, to 2 6105, and I set up a new 60 G tank just this month, with 4 tunze pumps and return so please .... lets have a friendly discussion about a product ...

will you please explain to me how every pump in market passes the test Except Tunze ? are they different then every other pump there is out there ? does the error margin only apply to tunze and nothing else ?

why didnt tunze say the tests were wrong ? instead Roger said we will fix it, and started shipping out breakers wih higher voltage !! is that their way of admitting to it ? ... that to me shows "guilty" .

Tunze reps continue to say GPH number doesnt matter, and that its about quality of flow ... I agree ! but why not put that on the box rather than putting a wrong GPH number up there ?

you know what I mean ? if you work in eng. as a professional, then you know that these "mistakes" are not good to make ! sure .... their "mis-calculations" on GPH number could be wrong and it wont kill me .... but ethics are ethics ! if fan companies started testing their equipment tomorrow, and found out Brand XX was not being honest about the flow ... can company XX's CEO come out and say " Come on ppl .... its not like its gonna kill anyone, its just a fan, let it go"

if you think that the fan company can come out and say that and be accepted by public, then sure, Same goes with Tunze for you, but not for me ....

like the other guy who brought in live rock illegally and got cought and every one was mad at him on here ! i was too ! but could he come out and say " come on ... it didnt kill anyone, get out more often if you care about live rock so much" ....

but again, not knocking the product itself, I like the tunze pumps, but I do not like the hyped up GPH numbers, in order to put them in the same market range as some other products ... they could have simply said on their box "GPH is not important, the quality of flow is important, this pump can be COMPARED TO a pump generating XXX GPH ... " then it would have all been fine ...


That’s easy. Company A ran a test one way, company B ran it another.

These aren’t really pumps, they are moreso like blowers.
Pumps have an inlet and an outlet.
Water in one end, out the other. You define the media (fluid property type) and pipe sizes then extrapolate your curve based on GPM and pressures.
For blowers and industrial fans, you would follow ISO standard ISO 5801:2007
For centrifugals ISO 5198:1987
I’ve spent countless hours on pump test stands (big stuff +2000 hp).
Trust me, you can fudge numbers if you really wanted to.
c


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