The impact of tubing sizes

[kevinbo03]

Wow, some very interesting information!

I hope this affects manufacturing designs, I for one would prefer 1/4" tubing. So much more compact and flexible, However I wouldn't be surprised if pumps with stock 1/4" barbs operated significantly louder per GPM; Much like 80mm Vs 120mm fans.

Rated 5/5

[C'DaleRider]

Thank you, Cathar, for the empirical data on this subject. This goes a long way in settling a lot of the constant bickering on tubing and diameters needed.

Of course, I've talked with more than one member that admitted, in private typically, that when they converted from 3/8" to 1/2" or 7/16", they rarely saw the dramatic decreases in temps. that were "supposed" to happen as one would think from reading a LOT of the posts around here.

[Cathar]

Part No. 51025K187 over at www.mcmaster.com appears to be pretty much what I had in mind for a 1/2" OD push-lock fitting. Will fit to 1/4", 3/8" or 1/2" NPT pipe thread size. Technical drawing appears to show that the port ID to be 3/8" ID (i.e. no flow resistance), and appear to show that you could happily apply these with an O-ring seal on the thread section for easy sealed fitment.

Part No. 51235K117 is also another example. It says rated for air only, but it's butyl/delrin, so for use with water should be fine.

Part No. 5111K87 also looks to be the goods.

[serialk11r]

Wow, some very interesting information!

I hope this affects manufacturing designs, I for one would prefer 1/4" tubing. So much more compact and flexible, However I wouldn't be surprised if pumps with stock 1/4" barbs operated significantly louder per GPM; Much like 80mm Vs 120mm fans.

Rated 5/5

...the size of the fittings is not exactly related to the RPM...They can make the barbs whatever size they want, but if the impeller and motor are the same don't expect much to happen.

[Cathar]

If anything, based upon experience with various pumps, adding more restriction causes a pump to spin more slowly (a little bit) and cuts down on noise levels.

[dinos22]

this is a bit OT but with the knowledge base in this thread might be worth asking anyways

is it a good idea to control pumps like the DDCs with a fan controller (my can controller takes around 18 or 20W per channel so i could in fact lower the RPMs?

how would that affect the pump

[sick_g4m3r]

this is a bit OT but with the knowledge base in this thread might be worth asking anyways

is it a good idea to control pumps like the DDCs with a fan controller (my can controller takes around 18 or 20W per channel so i could in fact lower the RPMs?

how would that affect the pump

no because starting amperage required exceeds that of normal running, thus requiring a peak of 25-30W at startup and frying the controller

[dinos22]

no because starting amperage required exceeds that of normal running, thus requiring a peak of 25-30W at startup and frying the controller

oh i see

damn

looks like i'll have to find a more powerful one then hahahahah

[Cathar]

Also would want to be careful that it's not a PWM based fan controller. That'll destroy the pump fairly quickly.

I have a Vantec Nexus fan controller. Yeah, one of the ones that people have a love/hate relationship with. I like mine. One day without thinking I plugged a Laing D5 into it to see how it'd go, completely forgetting about that it only has a 12W per channel power rating. It handled the load fine until I realised what I had done. I touched the PCB of the controller and it was roasting hot! Unplugged the pump quickly and the controller was fine.

You might get away with a DDC1 on a fan controller, but not a DDC1+/2.

[_G_]

a little ot but how did you manage to get yourself housebound?
get well soon but stick around the forums

[sanhacker]

Also would want to be careful that it's not a PWM based fan controller. That'll destroy the pump fairly quickly.

I have a Vantec Nexus fan controller. Yeah, one of the ones that people have a love/hate relationship with. I like mine. One day without thinking I plugged a Laing D5 into it to see how it'd go, completely forgetting about that it only has a 12W per channel power rating. It handled the load fine until I realised what I had done. I touched the PCB of the controller and it was roasting hot! Unplugged the pump quickly and the controller was fine.

You might get away with a DDC1 on a fan controller, but not a DDC1+/2.

This has me concerned. mCubed advertises the ability to run pumps via the BigNG. Is this inaccurate?

[dinos22]

Also would want to be careful that it's not a PWM based fan controller. That'll destroy the pump fairly quickly.

I have a Vantec Nexus fan controller. Yeah, one of the ones that people have a love/hate relationship with. I like mine. One day without thinking I plugged a Laing D5 into it to see how it'd go, completely forgetting about that it only has a 12W per channel power rating. It handled the load fine until I realised what I had done. I touched the PCB of the controller and it was roasting hot! Unplugged the pump quickly and the controller was fine.

You might get away with a DDC1 on a fan controller, but not a DDC1+/2.

lol i better stay away

actually mine is a Nexus but the spec says 18W per channel lol

i have DDC2 18W pump lol so that will probably kill it fairly quickly hahaha

[ranker]

This has me concerned. mCubed advertises the ability to run pumps via the BigNG. Is this inaccurate?

The BigNG can run a pump just fine. People have reported that they can run two. However, for two or more pumps, I'd recommend going with the miniNG add on.

[migueld]

Careful about pumps and controllers: when undervolting my DDC on my bigNG the bigNG's heatsink gets extremely hot, about 50-60 degrees Celcius. It seems the "saved" energy gets converted into heat

[alpha0ne]

Running any electric motor with lower than spec V rating will cause it to overheat and maybe even kill it

Thanks for the push/pull fittings link Cathar, I hope they ship to AU

[Jedda]

Yeah but how cool is it to WC your fan controller!
An excuse for yet another loop.

[ranker]

Yeah but how cool is it to WC your fan controller!
An excuse for yet another loop.

Sorta like people who put fans on their pumps. Ironic isn't it.

[Ambro]

quote - Yeah, Swiftech have had 3/8" systems for ages now and had stuck by it in the face of a rampant 1/2" market. They were right to do so. ....

Nice, very nice.

Moral of this story - do what is proven to be right and what you think is best despite others opinions (even if they have a post count of 10,000,000)

[septim]

jedda, ranker its the classic egg or chicken which one came first...

"xs liquid cooling, every degrees C matters" hmm whatever happened to this motto... that temp diff from small to large tubing could mean more OCing potential to a user.

so its usually up to the end user which size he or she can manage...

[NaeKuh]

fantastic thread

somehow i don't think IanY is accepting anything Cathar says keep it up guys

i do understand what the argument is that IanY is hiding behind which is not only insulting Cathar but anyone that accepts any of his research. It's all good though we'll just do the usual blind following of Stew's factual work and enjoy the odd "ownage" comment . I must say it's becoming poetic almost.

i do question members if i feel they may have it wrong myself......but not like this....this is just comedy central

[edit]Stew i should have ran it by you before i posted on OCAU about your findings lol.....ah well what's done is done >>> talk about getting owned hahhahah

No, i think iany just got bored.

If you read cathars exception of a small nuclear reactor, thats iany.

He has the quad with dual sli 8800GTX. And im not far from it either. :P

So i guess i am going back to 7/16

@cathar, 51025K187 <--- mcmaster-carr product, will that work on 7/16 tubing? Im kinda sick and tired of regular barbs at this moment, and wanted to try something much faster and easier. Of course my RD-30 will still use worm clamps tho.

[IanY]

No, i think iany just got bored.

If you read cathars exception of a small nuclear reactor, thats iany.

He has the quad with dual sli 8800GTX. And im not far from it either. :P

So i guess i am going back to 7/16

Oh... don't state what I have unless you receive documentary proof ! A "small nuclear reactor" is what I allegedly have, but you don't know, do you? Do you know for sure its not "all fluff and no stuff?" No, you don't know for sure

[ranker]

jedda, ranker its the classic egg or chicken which one came first...

"xs liquid cooling, every degrees C matters" hmm whatever happened to this motto... that temp diff from small to large tubing could mean more OCing potential to a user.

so its usually up to the end user which size he or she can manage...

Agreed. For some that 1C is something they'll chase for. For others, it's something they can live without. For the most part xtremesystems has always been about how hard you can push whatever you got. It's the same how some purchased a GTX after owning a GT where there was an estimated 1c-2c difference in temps based on prelim reports. People stilled jump at it as they wanted that 1C or 2C desperately.

Just find what it is you're looking for. If you're looking for rock bottom temps, stick with the larger tubing. If you prefer easier tubing management, go with 3/8" or "medium flow" as Cathar coined it. This post proves that 3/8" (medium flow) is a viable option for those who prefer smaller tubing without too large of a performance hit. Like someone else mentioned, funny how Swiftech had it right for so long and how Gabe and co still used it in their machines this whole time.

[IanY]

Like someone else mentioned, funny how Swiftech had it right for so long and how Gabe and co still used it in their machines this whole time.

And unlike what Scott (Nikhsub1) says, don't for a moment believe that I give only Cathar grief over what I disagree and let Gabe go free. I've been on Swiftech's case for a long time about small tubing, yes including 7/16".

[NaeKuh]

Oh... don't state what I have unless you receive documentary proof ! A "small nuclear reactor" is what I allegedly have, but you don't know, do you? Do you know for sure its not "all fluff and no stuff?" No, you don't know for sure

a little blue bird told me iany.

heh...

also whats wrong with 7/16ID tubing. This i know for a fact gives almost no performance redutions from 1/2ID. And yeah i tested this quite a few times. Thats why i have up on tygon 1/2 unless i really need it.

[IanY]

Nothing's wrong with 7/16" Its perfectly good tubing. Doesn't mean that I have to accept it, and that's the point. I don't have to use what is popular, nor do I have to accept what is popular as the written gospel.