My main run is 1 1/4" PVC.
If I reduce straight to a 3/4", will that blow out the joints?
Should I transition to 1", then to 3/4"?
The water source is well, with good pressure.
Water – PVC pipe transition from 1 1/4“ to 3/4”, in lawn application – will joints hold
pvctransitionwater-pressure
Related Solutions
I see no reason why you should cut threads on a PVC pipe. It seems to me that this would be unnecessarily difficult and would weaken the pipe.
You should, instead, get a slip to thread adapter and glue it onto the pipe to thread it wherever you like. Any big-box hardware store or irrigation department should be able to provide this adapter.
Edit: Here is a link to such an adapter for $1.56at big orange hardware store. :
The best lubrication I've found is some good ol' Elbow Grease™.
Actually, you should measure the proper lengths and just cut. Then glue it up and install. You can mark on the PVC how far it should go into the fitting if you want to be really precise. However PVC itself expands and contracts a lot with temperature change and is fairly flexible anyway. So, in my opinion, being extremely precise doesn't mean all that much anyway. Also, The solvent melts the PVC surface to weld them together, so the fittings will likely fit differently while gluing, thus making the dry-fit method even worse than just measuring.
Another solution could be to mark how far in the fitting the piece should go and lay them next to each-other in that position, even tape them together, to check your layout. That seems pretty time-intensive, though. I still think it would be better to just measure accurately and double check your measurements.
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Best Answer
I believe a direct transition, properly cemented, at normal water pressures, should hold just fine.
The downside to a gradual reduction as you described is the exact concern you put into your question - joints.
Your gradual transition idea will give more opportunities for joint failure simply because there are more involved.
PVC cement often surprises me how strong it can be.
So my recommendation is that you try a direct transition first. In other words, don't try to solve a problem until you know it exists. Make sense?