Q about spray bar holes?

[aeri]

I just made a DIY spray bar (about 1foot). And I'm wondering how many holes I should drill for a 1200 G/hr pump output? I currently have 9 3/16" holes drilled. I worry that if my output flow is restricted from the spray bar, it might damage my pump.

Please advise. Thx!

 

[Will Hayward]

Drill more holes until you feel there's no risk of that, or until the pressure coming out of them is starting to go too low.

 

[Knowdafish]

How long is the spray bar? I would add an extra hole at a time and try it.

 

[aeri]

Thanks.
I just expanded all the holes another 2 sizes for peace of mind. Now one of the holes sprays out little to no water, but I guess that's better than too little.

 

[dominicolas]

You seem to have fixed your problem, but for future reference, you probably won't hurt your pump if there is just a little resistance.

 

[badreverend]

If the holes are too big you could screw in the jets from a garden trickle system, and drill them to suit. Something else to think about, I've always made the holes closest to the water source a bit smaller than the outermost holes, for a more even and consistant flow.

 

[VLDesign]

If you add up all the holes you had (9), you get (.187 * 9) 1.683" so if the output on the pump has a diameter of less than th 1.6" you were fine at the 9.