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Post by madhatter on Feb 8, 2016 15:17:41 GMT 10
Hello all, I will try and keep this short 
I have built a highbanker the dimensions are: - sluice is 3ft long and 24cm wide - hopper is 2 1/2ft long and 24cm wide - riffle bars - mesh - miners moss - v matting I have used 1 inch pvc tubing for the spray bars.
I was looking at purchasing a 2.5hp 1inch 4 stroke pump specs as follows: - Engine Type: Air Cooled, 4 Stroke, Single Cylinder Engine
- Bore & Stroke: 52x46mm
- Displacement: 97cc
- Compression Ratio: 5.6 : 1
- Max Power Output: 2.5HP/3600RPM
- Rated Speed: 4000r/min
- Start Mode: Recoil (Pull Start)
- Fuel Tank Capacity: 1.4L
- Engine Oil Capacity: 0.45L
- Engine Oil Type: SAE 15w40
- Height: 370mm
- Width: 300mm
- Depth: 380mm
- Net Weight: 15kg
- Anti Vibration Feet
- Pump Type: Centrifugal, self priming
- Diameter of Discharge Port: 25mm (1.0")
- Diameter of Suction Port: 25mm (1.0")
- Max Suction: 6m
- Max Lift: 36m
- Max Delivery Volume: 11m3/hr
Would 1 inch be a suitable size for the spraybar and pump?  Or Should I go 2 inch? 
Please, any advice would be appreciated 
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Post by Rowdy on Feb 8, 2016 15:58:53 GMT 10
Hi Madhatter,
At 15kg I feel that the pump is a bit heavy to be carrying around creeks etc especially if you have to carry it too far from your vehicle. Also most 2.5hp pumps use a 38mm or 1.5inch outlet although some have both 1.5" and 1" outlets.
If you are using 1" hose you have to take into account hose friction which will reduce the volume of water you can pump over longer distances. A 1.5" or 2" hose will reduce the friction but increase the weight of the water that you can pump and the pump will need to work harder if you need to raise the water up from the creek to where you are working too far.
Also the 1" hose is cheaper to buy than the larger sizes so you will need to take the costs into account.
Years ago I had a pump that weighed 25kg and I soon got sick of lugging it around, now I also have a 2.5hp and a 1.5hp and I mostly use the 1.5hp as it only weighs 6kg.
Hope this helps with your decision.
Rowdy
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Post by madhatter on Feb 8, 2016 16:50:33 GMT 10
Rowdy, Thanks for info, Its good to get open perspective before I purchase more items I think maybe I was being a bit hopeful when I decided on the spraybar being 1 inch. I will be working the creek beds only, so distance wont really be an issue but, I do want an efficient system to work with. I am considering changing the spraybar to 1.5 inches to add more volume and make it easier for the pump to work. Thanks again Rowdy!! Much appreciated |
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Post by Rowdy on Feb 8, 2016 18:55:34 GMT 10
The spray bars themselves will be fine at 1" or even smaller, it's the supply hoses over distance that make a difference. The spray bars I use are 20mm irrigation plastic pipe and they are fine.
Rowdy
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Post by madhatter on Feb 8, 2016 20:24:59 GMT 10
Well,
In that case, I will keep the spraybar as is.
I was thinking of getting a 1.5 inch pump instead of the 1 inch pump and putting a reducer from the outflow (1.5 inch to 1 inch) with a control valve on it to control the flow better and to be able to run the pump at lower revs for quieter performance.
Thankyou again for your help.
Regards,
madhatter
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