Choosing the Right Pump for Your Project

Transcription

1 Choosing the Right Pump for Your Project presented by Demi Fortuna Director of Product Information Atlantic Water Gardens

2 really?

3 & present Choosing The Right Pump: Maximize Longevity, Cut Operating Costs and Double Your Profits! presented by Demi Fortuna Director of Product Information Atlantic Water Gardens

4 Today s Agenda 4 Easy Steps to the Perfect Pump Direct Drives, MagDrives, Hybrids When to Choose Which for What How to Cut Operating Costs The Advantages of Redundancy

5 4 Easy Steps to the Perfect Pump 1. Find GPH by width and appearance of falls 2. Size Tubing to provide best possible flow 3. Find the Total Dynamic Head of feature 4. Choose the perfect pump or pumps!

6 how to know how much flow? First determine total width of spillway(s) then choose the appearance desired: Trickle, ¼ -½ depth of water over spillway, allow 50 GPH for each inch of width of spillway Sheet, ½ -¾, allow 100 GPH for each inch of width of spillway NIAGARA, 1-1¼ deep over weir, allow 200 GPH for each inch of width of spillway 16 weir at low flow: 16 x 100 = 1600gph 30 waterfall, high flow: 30 x 200 = 6000gph

7 so what s this about Tubing Size? does it really make a difference? It makes ALL the difference! Restrictive Plumbing KILLS PUMPS! but what does restrictive really mean? and what about all those &@$% Charts?

8 Recommended Flow Rates Not Even Close!

9 The 5-feet-per-second cutoff Cresline Plastic Pipe Co., Inc. Charlotte Pipe and Foundry Who Says So? Step 3 - Tubing Size Chart Rainbird Corporation a little controversy, perhaps? The Plastic Pipe and Fittings Association Lasco, Spears, Dura Dark shaded area on chart indicates velocities over 5 per second. Use with caution.

10 flows under 5 feet per second eliminate damaging water hammer reduce stress fatigue in pipe and fittings lessen workload of pump and minimize flow losses due to friction so, less friction means lower head and greater water flow per watt

11 but, is it really all about the size of your hose? let s Virtual DEMO!

12 ok, imagine this

13 1-1/4 x25 1-1/2 x25 2 x25 3 x GPH 1-1/4 30 sec

14 1-1/4 x25 1-1/2 x25 2 x25 3 x GPH 1-1/2 15 sec

15 1-1/4 x25 1-1/2 x25 2 x25 3 x GPH 2 8 sec

16 1-1/4 x25 1-1/2 x25 2 x25 3 x GPH 3 6 sec

17 just how much was 3600sec/h x Xgal/Ysec Filling the 10 Gallon Bucket in 30 seconds = 1200gph 15 seconds 8 seconds 6 seconds 2400gph 4500gph 6000gph

18 Circumference versus volume π2r versus πr2 The surface area of the small circle is 2π ; the larger is 4 π, twice as much surface area, so we might expect about double the friction in the larger circle. The volume of the smaller circle is π ; the volume of the larger 4π, four times as much volume, so we can expect quadruple the flow through the larger pipe, with only double the friction. The larger the pipe, the greater the difference. 2r

19 Pipe & Hose Sizing Chart To minimize friction and maximize flow and longevity Flows up to (GPH) Use AT LEAST I.D. Flows up to (gpm) 240 ½ ¾ ¼ ½

20 so, let s see 1. Find GPH by width and appearance of falls 2. Size Tubing to provide best possible flow 3. Find the Total Dynamic Head (?) of feature, by Rule of Thumb or THE CHARTS! Then, Choose the perfect pump or pumps!

21

22 R.o (Rule of Thumb) (oh-oh) *following Pipe & Hose Sizing Guidelines* Add 1 foot of head for each 25 of hose; Add 1 foot for every check valve; Add ½ foot of head for every other fitting; Add to Static Head. Round up for THD. so, no need for charts, right? NOT SO FAST

23 Friction Loss Chart

24 actually Total Dynamic Head = Static Head+[(Run+Fittings)/100 x Friction Loss] For a 4 high x 30 waterfall, find the Total Dynamic Head, with: 6000 gph through 25 of 3 flex (chart) 1-90 elbow 1 - male/female adapter (bottom right table) 1 - swing check valve 4 + [( ) /100 x 2.66] = 6 TDH

25 So what? Do tubing size and head really make a difference? YES! 4 high x 30 waterfall, 6000 gph, 25 of flex PVC, 90 elbow, male/female adapter, check valve: [( ) /100 x 2.66] = 6 TDH [( ) /100 x 19.12] = 15 TDH 4 high x 30 waterfall, 3000 gph, 25 of flex PVC, 90 elbow, male/female adapter, check valve: [( ) /100 x 5.31] = 7 TDH 1½ 4 + [( ) /100 x 21.52] = 15 TDH 1¼ 4 + [( ) /100 x 52.41] = 29 TDH

26 and the difference is? 4 high x 30 waterfall, 6000 gph, 25 of flex hose, 90 elbow, male/female adapter, check valve: Assumed Actual Pump Rated gph at 4 at 6 (3 ) at 15 (2 ) Tsurumi 50PN * 5520* 5520* 5400* Little Giant K AWG TW * Need to raise back pressure w/valve to 11 head What about 3000 gph through 2, 1½ and 1¼? at 4 Static Head 2 /7 1½ /11 1¼ /29 EasyPro TH ! Little Giant K ! Danner Hybrid !

27 Tech Talk - Suction Cavitation or, How to Kill a High Head Pump Pondwater contains dissolved air, just like champagne contains dissolved CO 2 Drop the pressure pop the cork and the gas comes out of suspension, creating foam Likewise, low pressure at the inlet of a high head pump operated below its minimum head draws air bubbles out of the pondwater and into the volute The bubbles IMPLODE under high pressure at the pump s outlet, damaging volute and impeller The motor, spinning the impeller in froth instead of a solid column of water, overspeeds and burns out

28 4. Choose the perfect pump or pumps! Choose the type of pump that provides the desired flow in GPH Through the optimal tubing size at the correct Total Dynamic Head for the least wattage consumed. so, what types of pumps are there?

29 Choosing the Right Pump Direct, Hybrid, Mag, Axial SH watts Direct Drive costly to run, only necessary for high head. MagDrive small, simple, one moving part, easy maintenance Asynchronous for high volume, low head, v. low watts Axial Flow DOUBLE the flow for same wattage, v. low head TW watts L watts! MD watts

30 Submersible Pump Applications Axial Flow Very Low Head to 9 TDH, 0-3 psi Pro-Very Efficient, High Volume, No Cavitation Con-Limited Application, Requires Large Tubing MagDrive Low to Med. Head to 12 TDH, 5 psi Pro-Efficient, Dependable, Simple, Replaceable Impeller Con-Bidirectional, inefficient impeller, magnet size, noise HY-Drive Medium Head to 24 TDH, 10 psi Pro-Asynchronous, Very Efficient, Dependable, Very Quiet Con-Non Replaceable Impeller, flows drop off at high head Direct Drive Medium to High Head to 50 +, 15 psi+ Pro-Asynchronous, Efficient Impeller, Great Head/Pressure Con-Seals, High Power Consumption, Heavy

31

32 you ll want the lowest head pump possible. why? $$$ The Laws of Affinity state (more or less) that: you SQUARE the power to double the Volume; you CUBE the power to double the Pressure! 2 times the Volume = 2 2 = 4 times the Wattage 2 times the Pressure = 2 3 = 8 times the Wattage So, Cut the Volume, really drop the wattage Cut the Pressure, REALLY drop the wattage

33 to cut the volume, how about using 2 small pumps? Operating $0.08/kw/h 4 high x 30 waterfall, 6000 gph, 25 of 3 flex, 90 elbow, male/female adapter, check valve: Pump Cost/month = Watts x $/kw/hr x 24 hrs x 30 days/month Rated gph Actual Flow Cost/Month Tsurumi 50PN * 5520* $53.93 Little Giant K $58.40 AWG SH * $ AWG TW $39.74 * Need to raise back pressure w/valve to 11 head

34 does a few $ a month really make a difference? Operating $0.08/kw/h 4 high x 30 waterfall, 6000 gph, 25 of 3 flex, 90 elbow, male/female adapter, check valve: Pump Actual Flow List Cost/3years Tsurumi 50PN $760 $2700 Little Giant K $470 $2572 AWG SH $640 $ AWG TW $876 $2234

35 but wait there s more! How about all the other Advantages of Redundancy in ADDITION to the savings??? Less chance of night circulation failure Removal for servicing/repair Alternating use to save wear Elective flow at night/ for parties/ vacations/ off season/ off hours

36 so, is it worth figuring the GPH by appearance; calculating the Total Dynamic Head; selecting low head, high efficiency pumps; buying two pumps and twice the plumbing? Bet your Bottom Dollar!