Q:Does the water pump and the circulating pump belong to the centrifugal pump?

They're all centrifugal pumps!

Q:Is the pump lift horizontal or vertical?

The vertical height from the center line of the pump impeller to the surface of the water source

Q:Is it normal for my sump pump hole to be empty. No water in there.. ??

yes the ground water in your area is draining back into the ground away from you which is what you want

Q:What's the meaning of a single-stage pump?

Single stage impeller or multistage impellerGenerally speaking, multistage impeller is adopted in booster pumps

Q:Had a water pump start leaking, when I replaced it with a new one, it leaked even worse (around the gasket and O rings this time). The process I took...I unbolted everything and removed the water pumpI scrapped everything off with a wire brushI coated both sides of the gasket with red gasket siliconI mounted the new one and bolted it down tightening in a cross pattern(kinda difficult to get everything lined up)It leaked real bad the first time so I loosened the bolts and played with the top rubber seal to make it seat better.It leaked a little less the second time... but still WAY too much.I completely removed it the third time and (totally distroying the gasket) gooped it up with gasket sealer again, along with the O rings and tried again... leaked worse.Considering options... go with a white or black high heat siliconPossibly just using the sealer with NO gasketGooping the HECK out of it with JB-weld and pray!Suggestions?Know what I did wrong here?

Two questions 1) Did you buy a new gasket? 2) Did you let the sealant set long enough? If you answered yes to both of these than the only thing left is to make sure you have the right type of sealant. Is it the waterproof stuff for waterpumps? You mentioned the stuff was red, it's been a couple of years since I changed a waterpump but I believe it was the BLUE stuff that I needed. But I could be wrong. Take it apart. Make sure it's clean (you can use a wire brush but I find a paint scraper works better) and apply the new gasket to the new water pump then but the whole thing back on the engine. Star pattern tightening the bolts. Test it without putting the clutch fan (I think this still has one) back on just to see if it's leaking. Hope that helps.

Q:can stress from to much weight cause the engine to get hot and cause your water pump to leak out the weep hole? and what else causes it to leak?

This could be normal wear-and tear. Poor cooling system maintenance will cause a water pump to fail premtutrely.

Q:My car overheats in hot temperatures I have try everything except replacing the water pump and radiator how can I tell when its time to change each one and is it a do-it-yourself job

Boomer is right in what to check first. but in this order. Check that the fan is working properly. Check that the radiator is clean and not clogged. Replace the thermostat. Replace the Water pump. Depending on the car/truck, is what dictates how hard it is to do. On older cars (a chevy 350) It takes 15 minutes for a novice to replace, On newer cars it varies greatly, as some are behind the timing belt and all other accesories,(plymouth breeze takes about 15hours for a novice) and some are just as easy as older cars.

Q:What is the difference between a sewage pump and a clean water pump? Why can't sewage be pumped with clean water?

The main difference between water pump and sewage pump is that:Impeller and runner design, as well as other parts of the configuration are very different.1., in order to prevent clogging of sewage pump, the main design of large flow channel, so naturally lead to relatively low efficiency, so the head is generally not high. Clear water pump flow smaller, smaller clearance, the head is relatively high.2. in order to prevent the wound, water pump impeller design is more simple but not ring pump, equipped with tips, cloth and other debris can be crushed after the pump, and the impeller water pump is relatively complex, but the efficiency will be significantly higher than the former.Why can't the sewage water pump and impeller: because features of key design, resulting in water pump for sewage situation is likely to occur, blocking, winding, wear and corrosion occurs, resulting in damage to pump or scrapped, so water pump can not be used for sewage.Sewage pump is a pump and motor conjoined, and at the same time submerged into the work of pump products, and general horizontal pump or vertical sewage pump compared to the sewage pump compact structure, small footprint.The water pump is for the transport of water and physical and chemical properties similar to water and other liquids used, suitable for the industry and the city water supply and drainage, water pressure high-rise buildings, garden sprinkler, fire booster, long-distance transportation, HVAC refrigeration cycle, irrigation, bathroom, cold and hot water circulation pressurization and equipment.

Q:A Pump is direct driven by a 25 HP 900 rpm electric motor at rated load. In order to to double the quanitity of water delivered, it would be necessary to substitute a motor rated at____HP at____rpm. ans. 200 and 1800. not sure how they came up with this answer...whats the equation???

N = (95 H.C)/D Where N = rev/min D = diameter of impeller over blade tips in metres H = total head in metres C = constant. C depends on the shape of the pump and normally lies between 1.05 and 1.2 Later edit. I'm not sure if you are aware of it but each impeller has it's own characteristic performance curve.

Q:My toilet has a water pump to deposit water to the toilet and a floatie that will stop the flow. But now it does not flow water through the hose, instead it looks like it's clogged and water drips from the floatie handle. Do i need to replace it? Or could it be something easy to fix?

You should call plumber and tell him what's your actual, problem. thanks