For those odd PVC Fittings.

[SteveMM62Reef]

Got these from PVC Fittings Online, shipping was fast.

 

[Peace River]

Now I'm curious. Are they all standard standard/imperial fittings or are they metric adapters? The attached typed sizes imply they are all standard sizes. What did you need these particular fittings for and why threaded on the T?

 

[SteveMM62Reef]

I already have a BSPT Fitting to 1-1/4” PVC, for a new 24Vdc Pump. I need a Half inch take off to my Media Chambers, Barb fitting, and it needs to be Compact, for everything to fit. I’m also doing another take off above that one for my UV, then a 3/4” Return to the Aquarium. Its new pump takes the place of two 120VAC pumps, which cause Summer overheating problems, both of these pumps are from 2015, and at the end of their service life. Figure the new pump will pay for itself in Six to Eight Months. Also this Aquarium has the DIY, 12Vdc Battery Back up Pumps. Ordered Extra Coupling Reducers, and the Reducing “T” for my other Aquarium, to make a manifold for it. All are including the BSPT, imperial. BTW, I never use Bushing Reducer, the can create a back pulse to pump, which will shorten its life. This I learned taking courses from Pump Manufacture, in my HVAC Tech. days. Also I don’t like using Bushings on my Drains to the Sump.

 

[flagg37]

What? You mean your Home Depot doesn’t carry those fittings?

 

[flashsmith]

Could have just picked up some reducer bushings and achieved the same results. Then again I do irrigation for a living and have no clue what you are referring to. Does your return pump have 150 psi?

 

[SteveMM62Reef]

What is your Point “flash smith“ that you have to come in here to trash my post! I can’t get these fittings at any of the big box stores, Ace, or a local plumbing supply. This Site has the Odd Fittings, put them in the Mail the same day, and had them I two days. I’m trying to talk them into carrying BSPT Fittings, presently are only available from McMaster-Carr They are non-tapered to fit many of the 24Vdc and Some 120VAC Return Pumps. Run a Tapered PVC Fitting, and you have a good chance of cracking the pump connection and housing.

 

[BeanAnimal]

BTW, I never use Bushing Reducer, the can create a back pulse to pump, which will shorten its life. This I learned taking courses from Pump Manufacture, in my HVAC Tech. days.

That is actually incorrect.
This is not HVAC.
There are absolutely no similarities.
Water vs gas
Centrifugal vs positive displacement

A centrifugal pump (what we use for aquariums) does LESS work as head pressure increases, not more. Valving back (or restricting by other means such as pipe fittings) a centrifugal pump does absolutely no harm. In fact, you can fully close (deadhead) the pump and it will do absolutely no harm except for that fact that the water “stuck” in the volute will heat with friction.

HVAC pumps are positive displacement pumps, not centrifugal. Back pressure causes the pump to do more work and puts more strain on the reed valves, crank, piston (or scroll), bearings and rings. Moreover (in HVAC applications), as back pressure increases, the chances of the “pump” processing liquid instead of vapor increase. HVAC pumps are designed to pump (compress) vapor, not liquid. When they end up pumping liquid (slugging) they are damaged, as the components (again) are sized to compress vapor, no incompressible fluid.

Lastly, at the flows and pressures and pipe lengths that we are dealing with in the hobby, there is pretty much zero difference between using a bushing and a bell, with regard to overall flow (head loss).

 

[SteveMM62Reef]

Typical Commercial Pumps Impellers. BTW, during my 40 plus years in Commercial HVAC Service, I saw very few Positive Displacement Pumps. Few for Natural Draft Cooling Towers, “not used anymore on this application.” Booster Pumps, for Domestic Water System to push water to the top floors of buildings.

 

[BeanAnimal]

Typical Commercial Pumps Impellers. BTW, during my 40 plus years in Commercial HVAC Service, I saw very few Positive Displacement Pumps. Few for Natural Draft Cooling Towers, “not used anymore on this application.” Booster Pumps, for Domestic Water System to push water to the top floors of buildings.

Those are fluid pump impellers, meaning that they belong to centrifugal pumps. My comments regarding centrifugal pumps stand, the operational facts are not debatable or different when used in HVAC applications. A fully deadheaded centrifugal pump output is the same as it running just above its max head on its pump curve. There is no damage, in fact the pump Is drawing less current than it would at other points on the pump curve. it doesn’t matter if the fluid is air, water glycol or sewage….

My comments regarding HVAC “pumps” were (clearly) in context to HVAC compressors, as your post was rather ambiguous and because centrifugal pumps can be impeded without damage, I assumed you were referencing HVAC compressor “pumps” which are designed to work at specified pressures and operation outside of the specified range can be damaging.