Items TO KNOW ABOUT FOUNTAIN PUMPS
byon 07-03-2012 at 02:22 AM (159 Views)
"When replacing a fountain pump or choosing a new one, initial there are some important terms to keep in mind:
"Head": This is the maximum vertical lift of the pump. For example, a 6 head implies the pump is rated to pump water up to 6 feet high. Note, nonetheless, that at 6 feet the pump would be providing extremely tiny water, with gallons per hour around zero. So if you need to pump, say, 200 gph at 72", you will probably need to have about a 300-600 gallon per hour pump to do the job.
"GPH" : Gallons per hour, usually rated at different heights
"GPM" : Gallons per minute, normally rated at various heights
"Pump Curve" : The amount of water volume "curved" according to a variety of heights. A 500 gallon per hour pump, for instance, may well pump 500 gallons per hour at " lift, 350 gallons per hour at 24" of lift, and so forth. When buying a pump for the first time or when searching for a replacement pump, it is vital that you know how many gallons per hour you want to pump and at what height (head).
Water Volume The total volume that you will be pumping is controlled by a handful of elements. A single factor is the size of the pump, as covered above. But you also must take into account how wide your tubing will be. Tubing is measured in two ways: inside diameter (i.d.) and outside diameter (o.d.). Very skinny i.d. tubing will drastically reduce water flow. Several buyers are shocked when they discover that, after hooking up their 500 gallon per hour pump to 1/2" inside diameter tubing, they are only finding what they consider a trickle.
We had an engineer do some calculations for us to illustrate the dilemma. Making use of a 300 gph pump with 1/two" tubing is going to restrict your flow to 253 gallons per hour. By rising the pump to 450 gallons per hour, but still making use of 1/two" tubing, you will improve volume only slightly, to 264 gallons per hour! The lesson is this: When acquiring a pump, find out what size of tubing is supposed to go with it. One more issue is running the tubing also far. Long lengths of tubing create resistance. If your pump calls for 1/2" i.d. tubing, for instance, but you are running the tubing twenty feet from the pump, it is
a very good notion to use 3/four" tubing instead so as not to cut down too much on flow.
How a lot water do I need? What size of pump? This question is answered in part by no matter whether you want a "trickle" or a roar. When you acquire a fountain, you will usually locate a recommended flow. For waterfalls, use this as a rule of thumb: for every inch of stream width or waterfall "sheet," you will need to deliver 100 gallons per hour at the height you are pumping. So if you are building a 12" wide waterfall that is three feet tall, you require to buy a pump that will be pumping 1200 gallons per hour at three feet of height. For small ponds, whenever feasible, it is a good concept to recirculate the water as soon as
an hour, far more usually if feasible. Thus, if your pond is 500 gallons, attempt to buy
a pump that will recirculate water at a rate of 500 gallons per hour. For genuinely
big ponds, this is not needed and is far also costly. water ionizers site"