MP800SR Rotators with PRS30 Uniformity

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llO0DQLE
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MP800SR Rotators with PRS30 Uniformity

Post by llO0DQLE » August 23rd, 2017, 7:27 pm

I'm looking for some reviews and feedback from people that have use this combo to decrease the short radius MP rotators to achieve a 6 foot radius. Hunter says that MP rotators perform best at 40 psi so I'm wondering what people's experiences and reviews are regarding uniformity with 30psi with a 6 foot radius.

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Re: MP800SR Rotators with PRS30 Uniformity

Post by Green » August 23rd, 2017, 11:45 pm

Ok, and I hope you get feedback from people.

But do keep in mind that the precipitation rate with the SR models is higher (double?) that of the regular MPs.

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Re: MP800SR Rotators with PRS30 Uniformity

Post by llO0DQLE » August 24th, 2017, 12:49 pm

Yes, 0.8 vs 0.4. But I prefer that as 0.4 is painfully slow. Rainbird's version, the rotary nozzles, are 0.6/hr which seems ideal but minimum radius is 8 feet. I'm thinking of using Hunter MP800SR with PRS30 for my front lawn which is ~6 feet wide in a lot of sections. But Hunter says MP rotators including the SR line prefer 40psi of pressure so I'm looking for feedback from people that have used this combo to see if uniformity is good.

My other option for the front lawn if this combo doesn't work is the Toro Precision Spray Nozzles but radii are 5' then 8'. I'd have to overshoot the 6 foot wide sections by quite a bit.

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Re: MP800SR Rotators with PRS30 Uniformity

Post by rtomek » August 24th, 2017, 1:11 pm

Yes the 0.4 is really slow, but you can put twice as many heads on a single zone to make up the time difference. What matters is how many gallons you need to get down one inch and how many GPM you are pushing out. Can't speak to the 800SR nozzles since (as mentioned in the other thread) I used side strip nozzles to get at thin areas, and if you push those to 50 PSI you can get 6x16 or 6x32 rectangles.

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Re: MP800SR Rotators with PRS30 Uniformity

Post by Green » August 24th, 2017, 1:52 pm

Don't forget that with a spray nozzle, you can turn down the radius with the screw on top...usually they say by 25% (so 6 feet should be ok for the Toro 8 foot nozzle) and still have uniformity. Yet another reason to run your own tests.


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Re: MP800SR Rotators with PRS30 Uniformity

Post by llO0DQLE » August 24th, 2017, 11:02 pm

rtomek wrote:
August 24th, 2017, 1:11 pm
Yes the 0.4 is really slow, but you can put twice as many heads on a single zone to make up the time difference. What matters is how many gallons you need to get down one inch and how many GPM you are pushing out. Can't speak to the 800SR nozzles since (as mentioned in the other thread) I used side strip nozzles to get at thin areas, and if you push those to 50 PSI you can get 6x16 or 6x32 rectangles.
It's a bit of a moot point because I need the short radius of the SRs but if you want to put more regular MP rotators in one zone to up with precipitation rate, then are you going to have them overlap more than head to head? I guess if you need the longer radius and can't use the SRs then this is what you could do...

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Re: MP800SR Rotators with PRS30 Uniformity

Post by rtomek » August 28th, 2017, 5:08 pm

Not quite. Instead of having two zones of SRs that run for a shorter period of time each, you have one large zone of standard MP rotators. The total time it takes to water the entire yard should be the same. Part of the benefit of MP rotators is that (depending on your soil type) it won't put down more water per hour than the soil can absorb. The smart irrigation controllers will do the 'soak and cycle' irrigation, my system triggers this for my soil even with the standard rotator MPs.

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Re: MP800SR Rotators with PRS30 Uniformity

Post by llO0DQLE » August 29th, 2017, 12:35 am

rtomek wrote:
August 24th, 2017, 1:11 pm
Yes the 0.4 is really slow, but you can put twice as many heads on a single zone to make up the time difference.
rtomek wrote:
August 28th, 2017, 5:08 pm
Not quite. Instead of having two zones of SRs that run for a shorter period of time each, you have one large zone of standard MP rotators. The total time it takes to water the entire yard should be the same.
I'm confused.

Yes, 0.4in/hr is good if you're soil's infiltration rate is pretty slow. 0.8in/hr doesn't seem to be too much too fast though. My yard can handle 1 inch in about 1.5hrs so about 0.67 inch per hour. The Rainbird Rotary Nozzles at 0.6 in/hr seems ideal.

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Re: MP800SR Rotators with PRS30 Uniformity

Post by Green » August 29th, 2017, 12:46 am

^llO0DQLE, I think rtomek is assuming you're going to use the optimal spacing and zoning for the MPR SR.

rtomek, I think llO0DQLE is thinking about cramming twice as many SR heads into the area on a single zone.

The number of heads your system can handle depends on your flow rates, and you'll have to know what your system's upper limit is. For example on mine, I don't believe I can get more than 11 gpm or a bit less...even if a single zone's nozzles exceed that number, I still get something approaching 11 gpm through the water meter. That limit is due to valves that are in the line I think. And that's a good thing, because if that weren't the case, I could exceed the safe recommended flow rate and cause issues for the pipes.

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Re: MP800SR Rotators with PRS30 Uniformity

Post by llO0DQLE » August 29th, 2017, 11:38 am

No I wasn't planning on cramming a lot of SR800 heads. I made a comment about how 0.4 in/hr was so slow and rtomek responded with the above quotes...

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Re: MP800SR Rotators with PRS30 Uniformity

Post by llO0DQLE » August 29th, 2017, 11:38 am

No I wasn't planning on cramming a lot of SR800 heads. I made a comment about how 0.4 in/hr was so slow and rtomek responded with the above quotes...

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Re: MP800SR Rotators with PRS30 Uniformity

Post by Green » August 29th, 2017, 10:23 pm

Ok. Then, I think all rtomek is saying, is that with a constant number of heads per zone, you're going to need about twice as many zones with the SRs because they cover less area...which will negate the speed advantage per zone.

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Re: MP800SR Rotators with PRS30 Uniformity

Post by llO0DQLE » August 29th, 2017, 11:19 pm

Ah yeah I get it now. So basically it simplifies it by putting everything in one zone.. but the main reason I was looking at the SRs was because of the shorter radius capability..

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