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Susco

I'll leave this here for the experts

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I had to redo the piping of a pump because the pump had to be repaired. I added a union on the pipe closest to the feed.

 

No shortage of air bubbles under the pump lid, but I don't see any water leaks.

 

Now here comes the mystery.

 

I switch off the pump, close all the feeding valves and the valve on the output, but air bubble keep arriving under the lid at a steady pace.

 

Many small bubble but every now and then a large bubble. I can clearly see the bubbles come out of the feeding pipe and not from the lid.

 

So with all feeding valves closed, the air must clearly enter somewhere between pump and valves.

 

The bubbles come so fast that in 1 hour there is visible air space under the lid, so the water must have gone somewhere.

 

I have checked the entire length of the pipe with my bare hands, and all valves, I can not find any wet spot.

 

I have replaced the lid seal already, even switched a lid from another pump, although when I look in the pump I can clearly see the bubbles enter the strainer from the pipe.

 

I just went checking again, all valves are now closed for 1 1/2 hour, and still bubbles are entering under the lid at a fast pace.

 

That's an amount of water that can't go unnoticed, so I'm really astonished that I can't find the smallest water drop on any joint.

 

As you can see from the video and image, it's quite a lot of air while running. When the pump is switched of a big bubble enters about every 2 seconds. If I close all the valves it slows down to about every 10 seconds, but it keeps coming.

 

I left pump off all night with all valves closed.

 

When I woke up the water in the strainer was right at the top of the feeding pipe. No bubbles were appearing anymore at that time.

 

The connector is at the highest level of the piping and connects to T junction that has 3 feeds.

 

I opened the lid and water in the strainer didn't drain until I opened one of the valves, which indicates the valves close properly and there was still water at the highest point of the piping, so the water in the strainer which was replaced by air must have exited the system within the pumphouse.

 

I checked all the piping again with bare hands, as specially at every joint or connection, and could not feel a wet spot anywhere.

 

IMG_20200210_092611.jpg.a35fe478e21f0b6f6fa330cb798dba15.jpg

 

 

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I finally found a drop of water where the pipe is screwed into the pump.

 

There is plenty of Teflon tape on the thread and the fitting is screwed inside until it locked.

 

What is the solution. More or less Teflon tape, or are there fitting available in Thailand designed for the pool pump that will fit better?

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Just now, bwpage3 said:

I would cut that mess completely out and start over

Why?

 

The pool is in service for 8 years, and there has never been a problem.

 

The only problem is the air bubbles when I redid the piping for 1 pump after I had to change the gear shaft seal.

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7 hours ago, Susco said:

 

@SwimmingPoolsThailand FYI I'm an existing customer of your company, last time I asked advice through messenger on your website the only response I got was that you didn't want to answer anonymous messages, however as an existing customer I had to login with my email before I could send you the message.

I replied to that email of yours, with the explanation that I thought you were aware of my email since I was logged in, and in the same response added my contact details.

I still never received an answer to my question, so I went elsewhere and never will be a return customer.

Within reasonable limits SwimmingPoolsThailand offers free technical advice whether those who request help are, or become customers or not. The company handles dozens of enquiries daily that are not concerned with the business of online sales.

 

All the company asks quite clearly is that one has the courtesy to provide a name, a broad indication of location (province), and a telephone number. This is generally the minimum required by most companies on their contact forms.

 

It is not necessary to create an account or log in in order to receive a response. Anonymous senders receive an automated reply requesting the required details. General enquiries are not handled by the same staff who process user accounts or the staff who operate the online store orders or the front-of-house showroom staff.

Edited by SwimmingPoolsThailand
still some words missing

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4 hours ago, SwimmingPoolsThailand said:

Within reasonable limits SwimmingPoolsThailand offers free technical advice whether those who request help are, or become customers or not. The company handles dozens of enquiries daily that are not concerned with the business of online sales.

 

All the company asks quite clearly is that one has the courtesy to provide a name, a broad indication of location (province), and a telephone number. This is generally the minimum required by most companies on their contact forms.

 

It is not necessary to create an account or log in in order to receive a response. Anonymous senders receive an automated reply requesting the required details. General enquiries are not handled by the same staff who process user accounts or the staff who operate the online store orders or the front-of-house showroom staff.

 

Thanks for the reply and trying to cover your own errors.

 

Did you notice that I said I HAVE an account and that I WAS logged in on your website when sending the message, so if your website login work properly you would be able to see who sent you the message and all the info you needed, otherwise what is the purpose of having an account?

 

Since I provided you with my email in the message, otherwise you would have not been able to send me that email in error, you actually had a second option to see the email was in your system already with all other details.

 

No need to reply, as this is off topic to the OP.

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57 minutes ago, SantiSuk said:

I don't claim any expertise but an intake of air into the system might not be evidenced by a water leak if the air was coming in to the linkages/pipework on the suction side of the pump. If it were me I would replace the union you fitted and any other pipework/valves between pool and pump involved with water supply to the pump and see if that got me anywhere. Thereafter I'd call in the pros (face-to-face) and take the flak over the spider's web less defensively than you have on the forum!

What I don't understand is that I let the pump run for a minute, so pipes and strainer are full of water.

 

Right after that I close all inlet valves, as well as the valve at the inlet of the filter. There is a check valve as well on the pump outlet.

 

So that should give me a closed system. At that point air keeps seeping into the strainer, so it must come from between the valves and the pump.

 

So when I let it rest like that all night, in the morning the strainer is half empty, so that water must have gone somewhere but I can find any wet spots on the pipes

 

I notice that if I open any 1 of the 3 inlet valves the pace of the bubbles seeping increases, but I guess that is normal because then you don't have a closed system anymore.

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funnily enough, I had a similar problem after working on a very old pump.... my problem most definitely was related to air coming in (being sucked in) at the inlet joint to the pump. Being a lazy <deleted>, I wrapped cling wrap and 100 mile tape around it.... problem solved.

 

that said, the amount of bubbles in your video seem insignificant and wont harm your pump or alter its performance.

 

are you losing water?

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Just now, jany123 said:

funnily enough, I had a similar problem after working on a very old pump.... my problem most definitely was related to air coming in (being sucked in) at the inlet joint to the pump. Being a lazy <deleted>, I wrapped cling wrap and 100 mile tape around it.... problem solved.

 

that said, the amount of bubbles in your video seem insignificant and wont harm your pump or alter its performance.

 

are you losing water?

Not sure what you mean with that question.

 

As stated in my last post, over night the strainer will drain if i leave the valves open, and I'm afraid that when the morning cycle starts the pump will have to prime every time.

 

If I close the valves the strainer will only drain half, but I'm not supposed to close the valves after every cycle.

 

So yes I lose water if that is what you mean.

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11 minutes ago, Susco said:

Not sure what you mean with that question.

 

As stated in my last post, over night the strainer will drain if i leave the valves open, and I'm afraid that when the morning cycle starts the pump will have to prime every time.

 

If I close the valves the strainer will only drain half, but I'm not supposed to close the valves after every cycle.

 

So yes I lose water if that is what you mean.

I’m assuming that’s an impeller pump, so having to prime isn’t a problem, as long as it does prime in due course (within a couple of minutes)

 

By water lose, I meant from the entire system. Are you refilling the pool more than normal? 

 

If you are  losing water from the pump inlet line, back into the pool, you might have a blocked check valve, but not be losing water from the overall system...(I have to clean my inlet check valve regularly.. secondary overflow tank vs skimmer box)

 

Anyway... the bubbles mean your sucking air from somewhere... it’s gotta be between the pool and the pump, so you need to be 100% sure your pump isn’t sucking from the newly made joint... other than those two things all I can say I good luck.

 

 

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14 minutes ago, jany123 said:

Anyway... the bubbles mean your sucking air from somewhere... it’s gotta be between the pool and the pump, so you need to be 100% sure your pump isn’t sucking from the newly made joint...

I think you should read my previous posts.

 

There is no check valve on the inlet.

 

The pump get feeds from 3 sources, each source has it's own ball valve. There is a check valve and a ball valve on the outlet of the pump.

 

The real issue is that with the pump switched off and all ball valves closed air bubbles are seeping into the pump strainer constantly, draning it by half over night, but I don't see any wet spots between the pump and the closed ball valves.

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