Pumps

how does an electronic pressure control switch for water pumps works?

admin — Wed, 02 Mar 2011 12:02:13 +0000

IDROMAT 2, CALPEDA pressure control which is usually used in water pump.

Probably a “load cell” pressure sensor, which is a strain guage sensor fixed to a diaphram, one side attached to the pressure being sensed, the other open to natural air pressure. The more pressure on the diaphram, the more the strain guage deflects, changing its resistance, which is read by the electronics and interpreted to a pressure value which it acts on.

Small submersible water pump for heated water?

admin — Sun, 11 Apr 2010 11:07:35 +0000

I am looking for a submersible small water pump to be in 40-60 degree celcius water permanently (we currently use small cheap bilge pumps but they are not in the heated water).

I’m not sure of the name on this brand of pump or what your capacity has to be however there are two types that come to mind..One is the magnetic impeller type which is a two piece pump the motor driver magnet sets outside the fluid and in close proximity to the driven impeller. The magnet force rotates the impeller at a pretty high rpm but the gpm is real low due to the loss of power through the magnetic coupling..
the other type is a tube and motor and an eccentric casting as the motor revolves the tube is squeezed by the arms of the outboard impeller and as they come closer together (arm/eccentric) the fluid is forced along the tube .Before the fluid has time time reverse itself the next arm is already squeezing the next impulse of fluid towards the outlet and acts as a check valve of sorts…
Any pump that is in contact with 60deg C fluid is going to require an insulation class that corresponds to the generated wattage temp + the ambient water temp.. Most wiring is set up for 90deg C but others in the TFFN categories go much higher. The insulation class of the motor is as important and if a pump of to low an insulation class is chosen the dielectric epoxy field insulation will break down….If One was handy with piping (copper fittings and etc) the grundfos circulation pump for boilers has a pump that will move a considerable amount of fluid if a constant positive head is maintained ..Well those were just some ideas i had ..Hope you find the right pump…From the E…

How do you set up an air pump in a fish tank?

admin — Thu, 08 Apr 2010 13:22:42 +0000

I have a fish tank with an air pump. Does anyone know how to set up the air pump? I have a pipe coming from the air pump and down into my fish tank, which then goes into an ornament, which then moves. People are telling me that I need a non return valve to stop water travelling back up the pipe.
Where do I put this non return valve- at what end of the pipe?

non return valve can go anywhere on the pipe. just cut the pip and put it in the middle. prefrably twards the top of the tank so you dnt get a pipe full of water it it back syphons. just blow the airvalve to see which way it goes in. the non return valve should be about 2 quid and is definatly recomeneded as if there is a power cut or your pump cuts out and you dont have one you will wake up to find you have a tank with half the water soaking into your carpet.

Also put a loop in you Electric cable towars the plug so if water does run down the mains cable it will drip onto the floor and not into the socket.

I need the bar code for 1 horse power ebara submersible water pump machine?

admin — Tue, 30 Mar 2010 16:52:35 +0000

The word "EBARA" is not an english word,I think its Italian so the spelling is correct.

spellings correct, Jap company of pumps manuf.
i didnt know they made anything that small.
but try this page

http://www.pumpsebara.com/products.html

new 1200 gallon 2 compartment septic tank needs what kind of pump?

admin — Tue, 30 Mar 2010 16:52:30 +0000

do i need a in Tank Pump or something else? its a concrete new, 1 opening, 1200 gallon 2 compartment tank and it needs a pump…but ahhhhh what kind?

Does it need a pump, or does it need to be pumped out? If its a pump, what is it pumping to? If it needs to be pumped out, that means the tank is full: call a septic tank service to empty it for you. NOT a do it yourself project.

Is there a way to bypass a 86 Honda accord, in tank fuel pump?

admin — Sat, 27 Mar 2010 15:08:23 +0000

My 86 Honda accord 2.0 crab. fuel pump went out a few weeks back, the pump is one complete unit, with pump and sender unit (witch is $140 up), the sender unit is still good. i was wanting to know if the pump can be replace with a hose the same length, and a inline fuel pump be added to the fuel out line on top of the tank. will this work or am i just wasting my time?

thank you.

I think it is unlikely the pump is bad. I have never personally seen a bad Honda fuel pump and I don’t know anybody who has. However, perhaps the most common failure in vintage Hondas is the fuel pump relay, known as the main relay. Check the first source for the whole run-down including a simple test..

Engine Diagnosis, Removal And Disassembly?

admin — Sat, 27 Mar 2010 15:08:05 +0000

1. A device commonly used to measure engine oil pressure is a
A. thermistor.
B. prove-out circuit.
C. body control module.
D. piezoresistive sensor.

2. When testing a starter system problem, a technician notices
that, after first turning on the headlights, the lights go out
completely when the ignition switch is turned to the start
position. What is the most likely cause of the problem?
A. A defective starter motor
B. A starter solenoid that’s stuck in the closed position
C. A discharged battery
D. Loose or dirty battery terminals

3. Two technicians are discussing the capacity of a battery. Technician A says that during
a capacity test, a battery should provide at least 9.6 volts. Technician B says that a
good battery should produce current equal to approximately 5 times its ampere-hour
rating for 15 seconds. Which of the following statements is correct?
A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A and Technician B are correct.
D. Neither Technician A nor Technician B is correct.

4. When taking an oil pressure test, a technician finds that the pressure is higher than
the manufacturer’s specifications. Which of the following is a possible cause?
A. A leak in the pickup tube C. A stuck pressure relief valve
B. Worn engine bearings D. Worn oil pump gears

5. Ferrous and nonferrous are the two basic classifications of
A. seals. C. metals.
B. gaskets. D. alloys.

6. Two technicians are discussing oil classifications. Technician A says using an S-class oil
is best used in diesel engines with compression ignition. Technician B says reduced
engine friction with synthetic oil may increase your gas mileage. Which technician is
correct?
A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both technicians are correct.
D. Neither technician is correct.

7. The radiator, recovery system, and thermostat are all parts of the engine _____
system.
A. lubrication
C. cooling
B. oil displacement
D. ignition

8. The addition of nearly 25 percent chromium to improve the overall quality of steel
results in
A. gray cast.
C. carbon steel.
B. stainless steel.
D. nodular steel.

9. A silicone coated gasket with a solid steel core and a rubber fiber facing, able to seal
coolant and oil at temperatures up to 2000ºF, is a _____ gasket.
A. valve cover
B. cylinder head
C. oil pan
D. intake manifold

10. Two technicians are discussing the cooling system casting plugs. Technician A says that
disc-type plugs are installed with the convex side facing out. Technician B says that
cup-type plugs are installed with the convex side facing out. Which of the following
statements is correct?
A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A and Technician B are correct.
D. Neither Technician A nor Technician B is correct.

11. As a general rule, the maximum gear clearances on a gear-type oil pump should be no
greater than
A. 0.001 inch. C. 0.005 inch.
B. 0.003 inch. D. 0.007 inch.

12. Two technicians are discussing the engine’s lubrication system. Technician A says a
warm engine with 10 psi of oil pressure per 1,000 rpms of engine speed is okay.
Technician B says that any oil pressure between 10 and 80 psi is okay, depending on
conditions. Which techinician is correct?
A. Only Technician A is correct. C. Both technicians are correct.
B. Only Technician B is correct. D. Neither technician is correct.

13. _____ is quite toxic, and can be fatal to humans in fairly small quantities.
A. Ethylene glycol coolant C. Engine water
B. Propylene glycol coolant D. Grain alcohol coolant

14. Head gaskets and exhaust manifold gaskets are both types of _____ gaskets.
A. soft C. silicone
B. hard D. anaerobic

15. Two technicians are discussing engine sealants. Technician A says most current manufacturers
use molded gaskets in their engines. Technician B says aerobic sealants work
with both plastic and metal. Which technician is correct?
A. Only Technician A is correct. C. Both technicians are correct.
B. Only Technician B is correct. D. Neither technician is correct.

16. Two technicians are discussing the diagnosis of an oil leak problem. Technician A says
that an oil leak will always be located at the exact spot where a drip is observed.
Technician B says that a special chemical dye and a black light can be used to detect
an oil leak. Which of the following statements is correct?
A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A and Technician B are correct.
D. Neither Technician A nor Technician B is correct.

17. To avoid using high-voltage wiring, some electronic ignition systems make use of
_____ systems.
A. emission control C. prove-out circuit
B. multi-

1 D
2 C
3 A
4 C
5 D
6 B
7 C
8 B
9 B
10 D
11 B
12 A
13 A
14 B
15 A
16 B

You can find answers to these questions in the ASE study guides. It is a combination of studying and experience that will help you to pass the ASE test.

When 2 pumps are connected in parallel, do the flow and pressure increase? Why?

admin — Wed, 24 Mar 2010 16:42:15 +0000

Suppose two pumps are connected in parallel and they both discharge in a single pipe, do their flow and pressure increase? Why? Please show answer with mathematical calculations.

It depends on the type of pumps. If they are positive displacement pumps then the flow will double and the discharge pressure will go up to over come the extra pressure drop caused by the increase in flow. This is because positive displacement pumps deliver the same flow rate regardless of the discharge pressure.

If the two pumps are centrifugal then the flow will increase but the flow will not double. This is because a centrifugal pump produces different amounts of flow depending on the discharge pressure. If you look at any centrifugal pump performance curve you can see this effect. At zero discharge pressure the flow is maximum and at maximum discharge pressure the flow is zero.

The down stream piping system has a pressure drop curve that varies with flow rate. The lower the flow rate the lower the pressure drop. The higher the flow rate the higher the pressure drop.

Two centrifugal pumps will produce a flow rate that balances their discharge pressure with the system pressure drop so the two are in equilibrium.

To demonstrate this mathematically takes more time than I have to give. If you do a web search I am sure you will find sites that address centrifugal pumps and system pressure drop curves.

What is the maintenance schedule for pressure washer pumps?

admin — Thu, 18 Mar 2010 21:11:13 +0000

if you just use it around home and it gas change oil once year l clean air filter yearly the presser pump has no maintenance on mine

solar panel 12V 20 Watts…..what battery / charge controller amperage would be sufficient/best?

admin — Mon, 15 Mar 2010 17:41:35 +0000

I have a 12 V ..20 watt solar panel running a 12 v 15 watt fish pond pump ,I want to connect a battery between the two for continues running ,what would be the best size battery (amps ) and what sort of charge controller would be best ,thanks
firstly thanks for your imputs so far
when I say"continues running " I was meaning during periods of cloud through out the day instead of the stop start that happens at the moment
when it’s a very cloudy day then I don’t expect the pump to run but I want to make sure it doesn’t run the battery too low

If you are running the 15W pump continuously, the 20W solar panel won’t be big enough. 15W x 24 hours = 360 watt hours (wh). Since the solar panel is generating electricity only during sunny hours, it can’t keep up. Let’s use 5 sun hours as an example, which is the total number of hours the sunlight is equal to the standard test rated power. 20W x 5 hours = 100wh. You’re 260wh short. You need around 95W to do what you want. (360wh / 5 sun hours + ~30% inefficiencies) http://www.altestore.com/store/Solar-Panels/100-to-149-Watts-Solar-Panels/Carmanah-CTI-110-110W-12V-Solar-Panels/p6871/

For the battery, you’ll need a deep cycle battery that is designed to be drawn down to about half way and recharged, repeatedly. They are rated in amp hours, (ah), not cca. Since you only can use half the power in it, you need it twice as big as you calculate. If you need 360wh, that’s 30ah usable power, 360wh / 12v = 30ah. 30ah x 2 (only using half of battery) + 15% (battery losses) x 1.19 (50F temperature compensation)= 82ah battery. http://www.altestore.com/store/Deep-Cycle-Batteries/Batteries-Sealed-Agm/Universal-Ub12900-12V-90Ah-20Hr-Sealed-Agm-Batt/p2004/

The charge controller is rated based on the current output of the solar panel. That 110W 12V panel is rated at 7.5A. Add 25% safety margin, you need at least a 9.3A charge controller. If you get one with a low voltage disconnect (LVD), you can have the pump automatically shut down if the battery gets low, saving the life of the battery if you’ve had a day or two of clouds or rain. http://www.altestore.com/store/Charge-Controllers/Solar-Charge-Controllers/PWM-Type-Solar-Charge-Controllers/Morningstar-Charge-Controllers-PWM/Morningstar-Sunsaver-Ss-10L-10A-12V-Pwm-Chgctrl-Lvd/p799/

You can run the numbers through a calculator like this to see for yourself, http://www.altestore.com/store/calculators/off_grid_calculator/

…….Update based on asker’s update…………. If you just want to run it for as long as you can with your 20W solar panel, you can size it based on your potential output from the solar. Let’s say 1.3A output, 5 sun hours, so 6.5ah. Multiply by 2 since we’re only using half of the battery, so at least a 13ah battery, figuring you’ll be using the power about as fast as it’ll be putting into the battery, so it’s really just acting like a buffer. I suggest rounding up if possible, since I didn’t figure in any inefficiencies or losses. http://www.altestore.com/store/Deep-Cycle-Batteries/Batteries-Sealed-Agm/MK-ES17-12-18-Ah-Sealed-Lead-Acid/p5925/ . Or if budget is more important than running duration, then http://www.altestore.com/store/Deep-Cycle-Batteries/Batteries-Sealed-Agm/Universal-UB12120-12V-12AH-20HR-Sealed-AGM/p1996/.

I still recommend a charge controller with a LVD to turn the pump off when the battery is low. So, while the panel requires only about a 2A charge controller, the smallest charge controller I can think of with LVD is the 6A, http://www.altestore.com/store/Charge-Controllers/Solar-Charge-Controllers/PWM-Type-Solar-Charge-Controllers/Morningstar-Charge-Controllers-PWM/Morningstar-Sunsaver-Ss-6L-6A-12V-Pwm-Chg-Cntrl-Lvd/p804/.