Plumbing question

[Bad Wolf]

I'm picking up my Tarm on Saturday and in order to minimize the amount of time I'll be with out heat I'm dry fitting as much piping as I can now. I'm running 1.25" black iron pipe for the main loop per Tarms layout. Are there any minimum distances between 90's and tee's? I don't have a lot of room so I'm going as short as I can between tee's and pumps and elbows.
Also what the best way to seal all the joints so I don't get leaks. Joint compound only or tape as well?

Any other points to remember? With luck I'll have a fire going by Sunday evening.

Thanks

Greg H

 

[mtfallsmikey]

I say no, unless Tarm has specific recommendations...also don't know how you are laying out you system eiether. As far as pipe dope, I like Rectorseal #5, or Megaloc...watch out for funky threads on offshore-made fittings though. If you have any leaks, disassemble and use both tape/dope.....and don't forget the unions for quick disassembly if the need arises.

 

[Bad Wolf]

Thanks, I was looking for general plumbing knowledge, things like don't install a Tee within "X" inches of an elbow or another Tee. I'm going to give Tarm a call today with a few more questions. I'll probabaly get some more unions just to make it easier. I've got some Rectorseal #5 and lots of tape.

 

[free75degrees]

maybe this is a problem, maybe not... I wonder if dry fitting too much threaded pipe could be a problem. I think there is a good chance that when you put on tape and tighten very tight with wrenches you might find that the spacing is different than when it was laid out dry. I was afraid of this so I did my whole piping by just doing small sections at a time and buying parts for each section as i went along.

 

[Bad Wolf]

Just got to the Grundfos pump and it says " If possible do not install elbows, branch tees, and similar fittings just before or after the pump". I was going to use a 3" nipple then go to a tee. Is that too close? What qualifies as just before? 2"? 4"? 8"? 12"?

Also how tight do you go? Snug or temple bursting tight? I get concerned that I can't make one more 360 to get the fitting lined up then I'll have to back it off 3/4 turn.

Thanks

 

[pybyr]

Just got to the grundfos pump and it says " If possible so not install elbows, branch tees, and similar fittings just before or after the pump". I was going to use a 3" nipple then go to a tee. Is that too close? What qualifies as just before? 2"? 4"? 8"? 12"?

Also how tight do you go? Snug or temple bursting tight? I get concerned that I can't make one more 360 to get the fitting lined up then I'll have to back it off 3/4 turn.

Thanks

I think I remember a rule of thumb from somewhere that you supposedly do not want to install any fitting that would create major back-pressure or turbulence within about 8-12 pipe diameters' length of the inlet or outlet of the pump, as the resulting turblulence apparently messes with the efficiency of the pump.

on turning in threaded fittings, I always puzzle with the same question that you mention - and if anyone has some suggestions, I'll be glad to hear

 

[gorsuchmill]

Is the distance to pump rule less significant in a closed system? I'm working on my install and have 90s planned for within six inches of both sides of my supply side pump.