Which Water Pump To Choose

[wayned]

I also have a WP-255Q3 and it works fine when used for the intended purpose, a "home" water system. It is not designed to be used as an irrigation pump that continuously runs for 1.5 hours. The motor overheats and the thermal cutoff kicks in. Decreasing the input volume to the pump will accomplish nothing.

When the pump is running it is pumping at full pressure and turning on another faucet will reduce the pressure at the other outlet. I have three pumps, the WP 255Q3 that I use for the house, showers, toilets, sinks, etc. I have another pump for irrigation, a irrigation pump designed for that purpose that has a presssure shout off switch. I also have another irrigation pump that I use to draw water from ongs that collect rain water for drinking. Both of the irrigation pumps are cheap chinese versions but are designed to run constantly.

The best way to solve your problem is to isolate your irrigation system from you house system and install a new pump specifically for that purpose. You could use the same water supply and just "T" off at the outlet of the tank. The Chinese pump that I use cost 2750 baht at the local Ma & Pa shop in my town. IT has 1" inlet, 1" outlet, a small accumulator tank and a pressure switch that turns the pump off when the water outlet is turned off.

Edited December 30, 2014 by wayned

[bcallinv]

Thank you very much for your useful information. Unfortunately some of the irrigation system is tied into the pipes from the house water supply. When the system is running, the pump never stays on all the time but comes on and off as it is pumping the water. What I could do is to set up the timers to stagger the times when the sprinklers come on, so it does not stay on for a long time. When the sprinklers are running, and I open up a faucet in the house, the pressure goes way down. Do you think a larger pump would help?

[bcallinv]

Here is a answer I received from Mitsubishi service center when I explained the problem to them.

Sorry I reply late, in your case I think that the problem may come from

1. Your Pump ratio between water and air incorrect which normally should mix water ¾ part +air 1 /4 part

2. may be The Tank taller than the Pump if the Tank installed underground will no this problem

2 cases will be the Pump is hiccup and soaking and then make it repeat start up

Due to too much pressure make it cannot air charge Explain : The air charger have 1 white ball working to shift for fill air sometime the ball not back let take off it to clean

How to countermeasure

1. OFF inlet valve ( between Tank to Pump)

2. Unscrew drain plug let water drain

3. OPEN inlet valve ( only open 50 % ) shouldn’t open 100%)

4. Finish

He says to open up the inlet valve only 50%. All of this is confusing.

In California I have a well that pumps water into a pressure tank which has a air bladder in it and it works great. I think that would work well here but don't think they are available here in Thailand

Again thanks for your thoughts on this.

Ben

[wayned]

There are pumps available here with rubber bladders, but the basic operation principle is the same. The Mitsubishi pump does not have a bladder. I don't know if the Hitachi does but I have an old ITC that does. I don't think that getting a larger accumulator type pump with the round tank attached will help. You could switch to a constant pressure pump, the square ones, and it might solve/improve your problem. Both Mitsubishi and Hitachi make them, they are more expensive than the acumulator type. Grundfoss also makes a very good pump but it is almost twice the price of the others.

The Grundfoss is pictured in post #55 above.

Here's a picture of the Mitsubishi pumps:

The round ones are the accumulator type like the WP-255Q3, the retangular ones are the constant pressure type that regulate the pressure by controlling the motor speed. Good luck!

Happy New Year!

[kamalabob2]

To Bcallinv: "In California I have a well that pumps water into a pressure tank which has a air bladder in it and it works great. I think that would work well here but don't think they are available here in Thailand" I am from California, but I never gave water pressure or water supply a 2nd thought. My how priorities can change living in rural Thailand. I have a blue pressure tank at my wife's two story home and it works fine. I had a grey colored pressure tank for 7 years at the same house and it also worked fine. Great PSI and water flow in all bathrooms, no problems with the Stiebel Eltron multi point water heaters operating in the kitchens or bathrooms. I have seen large blue pressure tanks in Buriram Province at a water pump specialist store that installed and maintains my Mitsubishi water Pump and Hitachi water pump for the house and the Calpeda Italian swimming pool pump for the swimming pool. The same Buriram Builders Merchants sold and installed the Franklin Schaefer Legend Tri-Seal submersible well pump on my wife's village garden plot of land. I am of the opinion that every Province in Thailand has a family owned "water pump shop" that is the "go to source" of water pumps, irrigation pumps, booster pump systems, water filtration systems, pump installation, and water pump repairs for hospitals, resorts, small factories, sports stadiums, community shopping centers, apartment buildings, University buildings, and Thai home owners who value dependable water pressure in their homes. Expats in Thailand can look for the repair company sticker at any government hospital or hospital small clinic that is placed on the water pumps or ask the Thai owners of a resort or prominent business what shop they rely on for proper water pump installation and repairs. I would wager it is not the air conditioned high overhead store that sells jacuzzi bathtubs, bathroom granite topped vanity sets made in China, or Global Crate toilets made in China. The same water pump specialist would repair Grundfos Water pumps at the store, such as the Buriram Builders Merchants. The same shop might be the Netafim drip irrigation dealer for your province and they will understand and sell a pressure regulator so that you can use drip tape or other low water use irrigation for gardens and crops. Proper and cost effective Netafim drip irrigation has been a game changer for my wife's garden in Buriram Province. I am no longer at the mercy the Brother in law to water the fruits and vegetables.

[gmac]

There are pumps available here with rubber bladders, but the basic operation principle is the same. The Mitsubishi pump does not have a bladder. I don't know if the Hitachi does but I have an old ITC that does. I don't think that getting a larger accumulator type pump with the round tank attached will help. You could switch to a constant pressure pump, the square ones, and it might solve/improve your problem. Both Mitsubishi and Hitachi make them, they are more expensive than the acumulator type. Grundfoss also makes a very good pump but it is almost twice the price of the others.

The Grundfoss is pictured in post #55 above.

Here's a picture of the Mitsubishi pumps:

The round ones are the accumulator type like the WP-255Q3, the retangular ones are the constant pressure type that regulate the pressure by controlling the motor speed. Good luck!

Happy New Year!

So which are better round or rectangular? I need to buy one soon for new house which will have underground tank. Also what power is good I'm leaning towards a 250 watt as the last house I rented had 300 watt and seemed a little strong, while current rented house has 150 watt and seems a bit feeble.

[plfomylo]

hello,

 

can you tell me what is the cheapest water pump that I could buy (and where) to replace this one if you think that it is broken 

 

 

thank you