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  1. #1
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    Water storage tanks.

    My 6000 litre underground Neo storage water tank split its side this week, leaving the pump running constantly trying to replenish it.
    I don't know if this will work but it was worth a try, yesterday a young guy recommended to me by the major supplier of storage tanks in Phuket repaired it.
    The alternative was going to be a huge bill of 45,000 - Dos brand !
    Has anyone had any experiences of these underground tanks, this one has lasted 5 years ?
    If I am going to consider purchasing a new one, which is the best brand for above ground and underground ?

  2. #2
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    I'd go for double skin stainless steel, above ground and under a tiled canopy.

  3. #3
    Member Scandinavian's Avatar
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    Above ground is soooo ugly.

  4. #4
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    Quote Originally Posted by Scandinavian View Post
    Above ground is soooo ugly.
    Not if it's done with care and some taste. The hole that's dug when an underground tank has to be replace makes an ugly mess!

  5. #5
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    I have both below ground and above ground tanks. I use a cascade system wherein the above ground gravity feeds into the below ground tank, both activate together on low water level floats ,independently of either but jointly if you can fathom that. The city water flow is regulated by a float on low water level and the lower tank activates by pump draw down and gravity re-fill by the upper tank based on low water level. I decided to incorporate the above ground tank to insure no shortages of water due to multi-person household usage as well as additional water storage during intermittent water supply by city sources. The above ground tank is S.S. construction and the below ground is the standard black poly extrusion common everywhere in Thailand. I would seriously check out the reason for the wall failure of your underground tank before investing in a replacement. It could be due to a faulty extrusion process or possibly external sunlight exposure (hard to believe) weakens the plastic due to ultra violate rays and deteriorates the poly. You may have some external force pressing on the wall of the tank and this caused the break as well. I suspect its simply a shop fabrication error. Check on the price for a replacement tank at your local dealers first. Next contact some local contractors for a bid/price for installation. Your current quote seems high in my opinion. I have a 1500 liter tank above ground and it cost arond 1,200 baht 5 years ago. I poured a concrete slab over the underground tank with access opening and cover operable from above ground and then placed the S.S. tank on the slab above the U.G. Tank. Seems to do the trick. Don't know if this helps but for what its worth...

  6. #6
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    Quote Originally Posted by ltnt
    I have a 1500 liter tank above ground and it cost arond 1,200 baht 5 years ago
    Think you missed a zero on the 12,000baht, ie stainless water tank.

  7. #7
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    Quote Originally Posted by up2you2 View Post
    My 6000 litre underground Neo storage water tank split its side this week, leaving the pump running constantly trying to replenish it.
    I don't know if this will work but it was worth a try, yesterday a young guy recommended to me by the major supplier of storage tanks in Phuket repaired it.
    The alternative was going to be a huge bill of 45,000 - Dos brand !
    Has anyone had any experiences of these underground tanks, this one has lasted 5 years ?
    If I am going to consider purchasing a new one, which is the best brand for above ground and underground ?

    why did it break? if it was in the ground, normally the surrounding sand/earth would keep it stable

    anyway, plastic can be repaired quite easily, with that fibreglass matting and Isopon stuff (car body repair kit)

    but from the inside, assuming you can get access

  8. #8
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    I did find myself contemplating a large underground tank for irrigation for some land better half has off grid in bangkok!!!!. Looking into the problem, with the standard of care and thought that builders often put into their work here; I came to the conclusion that any concrete tank would inevitably subside and crack and decided that the way ahead would be a concrete tank in the ground housing plastic tanks that would hold the water.

    In the end we didn't need the tanks, we managed to bully the water company into installing a water meter at the nearest water mains some 100+ meters away, so I cannot say how practical this idea would have been.


    If its drinking water.... you really want to keep that above ground, the last thing you want is contaminated drinking water

  9. #9
    Member Scandinavian's Avatar
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    Quote Originally Posted by Morden View Post
    Quote Originally Posted by Scandinavian View Post
    Above ground is soooo ugly.
    Not if it's done with care and some taste. The hole that's dug when an underground tank has to be replace makes an ugly mess!
    Be it a shit tank, water tank, WW2 tank, I'd not like to have any tanks on my property. Even though they would be installed with care...
    If I had an underground tank removed, I'd have the lawn carefully removed first, tank replaced, and lawn put back. But on the other hand, I'd make sure that the tank would hold for a very long time.
    -- I'm not completely useless. I can be used as a bad example. --

  10. #10
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    I know a few people will laugh but I have used on of those big clay rain water storage urn's. I had a stainless tank but it wasn't double skinned and rusted through in about 4 years.There is a guy that makes the big urns just outside our village,I dropped him in some 1"1/4 Blue fittings as the normal 3/4" are a bit small for the pressure pump that goes to the house.I rigged a float switch up on the galvanized lid so when the urn gets 1/2 empty the well pump comes on and fills the urn.The urn must hold 600+ liter's and only cost me 700 Baht and 140 baht for the lid.Also after they have seasoned you can paint it the same colour as the house and they just blends in

  11. #11
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    Any water tank wants to be sized to ensure a constant supply/turn over of "fresh" water. All water, whether from the "town" supply, roof or well, will have some impurities and having it sit in a tank will lead to their growth.

  12. #12
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    Quote Originally Posted by OhOh View Post
    Any water tank wants to be sized to ensure a constant supply/turn over of "fresh" water. All water, whether from the "town" supply, roof or well, will have some impurities and having it sit in a tank will lead to their growth.
    Talking of growth and impurities, has anyone found a plastic tank with a large enough opening to allow someone to get inside and clean it out ?

  13. #13
    Have you got any cheese Thetyim's Avatar
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    Quote Originally Posted by boloa
    I had a stainless tank but it wasn't double skinned and rusted through in about 4 years.
    It wasn't good quality stainless then.
    I like to use a magnet to check the quality of anything stainless before I get my wallet out.

  14. #14
    Have you got any cheese Thetyim's Avatar
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    Quote Originally Posted by joepaai
    anyone found a plastic tank with a large enough opening to allow someone to get inside and clean it out ?
    We have two plastics tanks where the complete top lifts off.

    Personally I would always go for a good quality stainless bell bottom tank.
    They don't need cleaning if there is a drain cock fitted to the bottom of the bell

  15. #15
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    Quote Originally Posted by Thetyim
    Personally I would always go for a good quality stainless bell bottom tank. They don't need cleaning if there is a drain cock fitted to the bottom of the bell
    agreed on that type

    what is the drain cock for except cleaning?

  16. #16
    Have you got any cheese Thetyim's Avatar
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    ^
    Draining the tank.
    There was a good clue in the title

  17. #17
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    Quote Originally Posted by DrAndy View Post
    Quote Originally Posted by up2you2 View Post
    My 6000 litre underground Neo storage water tank split its side this week, leaving the pump running constantly trying to replenish it.
    I don't know if this will work but it was worth a try, yesterday a young guy recommended to me by the major supplier of storage tanks in Phuket repaired it.
    The alternative was going to be a huge bill of 45,000 - Dos brand !
    Has anyone had any experiences of these underground tanks, this one has lasted 5 years ?
    If I am going to consider purchasing a new one, which is the best brand for above ground and underground ?

    why did it break? if it was in the ground, normally the surrounding sand/earth would keep it stable

    anyway, plastic can be repaired quite easily, with that fibreglass matting and Isopon stuff (car body repair kit)

    but from the inside, assuming you can get access
    Dr Andy

    Plastic tanks are a thermo plastic
    fiberglass & resin or ( car body repair kit) is a thermo setting plastic.
    It will not work

  18. #18
    Have you got any cheese Thetyim's Avatar
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    Quote Originally Posted by Ratchaburi
    It will not work
    Technically you are correct but anything that will fill a split and reduce the leakage to as near zero as possible has to be better than replacing the tank.
    The tank is not pressurised so it doesn't need to be perfect

  19. #19
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    Quote Originally Posted by Thetyim View Post
    Quote Originally Posted by Ratchaburi
    It will not work
    Technically you are correct but anything that will fill a split and reduce the leakage to as near zero as possible has to be better than replacing the tank.
    The tank is not pressurised so it doesn't need to be perfect

    thermo plastic Tank you can use plastic welding


  20. #20
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    Quote Originally Posted by Ratchaburi
    Plastic tanks are a thermo plastic fiberglass & resin or ( car body repair kit) is a thermo setting plastic. It will not work
    Quote Originally Posted by Ratchaburi
    thermo plastic Tank you can use plastic welding
    so that's alright then, weld it

    use these to help


  21. #21
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    Quote Originally Posted by Thetyim View Post
    ^
    Draining the tank.
    There was a good clue in the title

    I suppose I would not normally bother to drain a tank except to clean it

  22. #22
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    Quote Originally Posted by up2you2 View Post
    My 6000 litre underground Neo storage water tank split its side this week, leaving the pump running constantly trying to replenish it.
    I don't know if this will work but it was worth a try, yesterday a young guy recommended to me by the major supplier of storage tanks in Phuket repaired it.
    The alternative was going to be a huge bill of 45,000 - Dos brand !
    Has anyone had any experiences of these underground tanks, this one has lasted 5 years ?
    If I am going to consider purchasing a new one, which is the best brand for above ground and underground ?


    Here in Thailand they do not like thing to last a life time.
    As they need it to full over so that you need to buy a new won.
    Also it is not a good idea to install PE plastic tanks under ground.
    Back in Aussie they started 20 years ago & had big problems.


  23. #23
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    Quote Originally Posted by boloa View Post
    I know a few people will laugh but I have used on of those big clay rain water storage urn's. I had a stainless tank but it wasn't double skinned and rusted through in about 4 years.There is a guy that makes the big urns just outside our village,I dropped him in some 1"1/4 Blue fittings as the normal 3/4" are a bit small for the pressure pump that goes to the house.I rigged a float switch up on the galvanized lid so when the urn gets 1/2 empty the well pump comes on and fills the urn.The urn must hold 600+ liter's and only cost me 700 Baht and 140 baht for the lid.Also after they have seasoned you can paint it the same colour as the house and they just blends in
    I used to have 3 of those ongs at the back of my old place in Khon Kaen. In those days they were 500 baht each, including delivery and lasted a lifetime. Don't see them as often now as more mains water available.

    Watching them be delivered used to be educational. Although they weighed a ton , just two blokes with the knack of finding the balance could roll them into position anywhere you wanted. Without the knack, almost impossible to shift.

  24. #24
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    I suspect the damage to the OP's buried tank came about through movement of the tank - either through subsidence or buoyancy.

    A full tank of water buried directly on earth at the bottom of a hole will over time sink if the earth cannot support the weight. Conversely an empty, or partially empty tank buried in land where the water table rises up to the tank will be subjected to buoyancy - This will cause movement, stress and may cause damage.

    To avoid this, cast a reinforced concrete slab at the bottom of the hole you are installing your tank into and line the hole with bricks to make a buried box.

    Install the tank and then fill the gaps with stone free sand . This will spread any pressures evenly - while the cast slab spreads the load at the bottom of the hole.

    Subsidence is common enough that most people have seen it and understand it. Buoyancy is a little harder to find, but I have seen a house pushed off the ground by ground water which had 'floated' the house on it's cellar.

  25. #25
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    Quote Originally Posted by Itchy
    but I have seen a house pushed off the ground by ground water which had 'floated' the house on it's cellar.
    blimey, sounds good; any pics?

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