How to properly 'weld' or mount an tap to a plastic tank

[Metropolitian]

Who knows from first hand how to properly fix a tap to tank.

 

In another thread we were talking about blue barrels and 'real' water tanks.

There was a blue barrel delivered to me and I want use it as a rainwater barrel, now we would like to have a tap near the bottom.

The plan is to drill a hole and mount one of those tap threads that is available here in Thailand.

 

The question now is: How to stick that thing to the tank.

 

Adhesive rings, silicon, two component glue, putty .. ?

I can make a big ring with thick plastic to reinforce the location where it will be mounted.

 

That 'thing'

 

And the barrel

 

 

 

Another suggestions are welcome.

 

 

 

 

[Metropolitian]

Addendum:

 

 

I am open for another solutions next to the blue tap thread thingie.

Which can be one of those:

 

Just want to know how to kit it watertight and truly fused together with the barrel.

[johng]

4 minutes ago, Metropolitian said:

The question now is: How to stick that thing to the tank.

Don't stick it,  use a male threaded thing  to screw into the female threaded thing.  with the barrel sandwiched between

 

[kickstart]

3 minutes ago, johng said:

Don't stick it,  use a male threaded thing  to screw into the female threaded thing.  with the barrel sandwiched between

 

To make it water tight you would need some washers , something like you have on ballcocks ?, they  would not be enough material on those joints  to make a seal  ,and maybe some sealing  mastic. 

[Lacessit]

The threaded technique is the answer, along with teflon tape to make the thread seal watertight. Has to be wound on opposite to the thread direction.

[johng]

If you have a hole just big enough to fit the diameter of the thread then a watertight seal should be possible, a bit of silicone sealer or rubber washers would not go amiss though.

[sirineou]

https://www.youtube.com/watch?v=K8D6leyW47U

[Metropolitian]

Thank you guys for the comments.

 

Definitely go the threaded way with the barrel sandwiched between.

Will use the black threaded element as shown above with one of the female threaded blue adapter inside the barrel.

 

@kickstart what would you use as mastic / resin ?

@johng Your idea is good, but not with the genders as you said. 

From outside the barrel I need to see a female thread. So it will be a hybrid and a female adapter.

 

 

Still the question stays; how to weld those plastic together. The answer I am waiting for was not only for the tap and barrel but also for another plastic mounts, like a broken hinge of a cooling box and for expanding my knowledge about 'glueing' plastics which I really not have now.

 

The only thing I did a long time ago was for acrylic and using chloroform which was only good for specific kinds of plastics.

[Don Mega]

I would use a spade bit the same diameter to drill the hole and use either a rubber washer or O-ring on the inside.... Ive purchased both from Hardwarehouse.

Edited May 6, 2020 by Don Mega

[Crossy]

A bit late to the party here, but what you need is a bulkhead fitting, comes with two washers so shouldn't need silicon etc.

 

https://www.aliexpress.com/item/4000981625022.html

 

 

Also, do you intend pumping from the barrel? If so take all the pipes in via the lid, no danger of leakage then ????

 

 

[sungod]

3 minutes ago, Crossy said:

A bit late to the party here, but what you need is a bulkhead fitting, comes with two washers so shouldn't need silicon etc.

 

https://www.aliexpress.com/item/4000981625022.html

 

 

Also, do you intend pumping from the barrel? If so take all the pipes in via the lid, no danger of leakage then ????

 

 

That looks far too practical and alot less fun! ????

[Crossy]

15 minutes ago, Metropolitian said:

Still the question stays; how to weld those plastic together. The answer I am waiting for was not only for the tap and barrel but also for another plastic mounts, like a broken hinge of a cooling box and for expanding my knowledge about 'glueing' plastics which I really not have now.

 

Gluing plastics, particularly different types of plastics to one another is an art that I've never really mastered.

 

Each plastic has it's own solution. If you're all PVC then the regular Thai-pipe glue should do the job if you keep all your hole clearances small.

 

[Metropolitian]

9 minutes ago, Crossy said:

Also, do you intend pumping from the barrel? If so take all the pipes in via the lid, no danger of leakage then

That I would to with another barrel for more clean water, which has a closed lid with two white screw-in closers.

And I would like to glue a female threaded adapter in one or both of them.

Pumping would happens without pressure, so yes from the barrel.

 

 

It's now with a hose and the 'gravity' method to fill buckets for the plants.

In Dutch language the method is called ' Hevel / Overhevelen ' .

 

[Crossy]

6 minutes ago, Metropolitian said:

In Dutch language the method is called ' Hevel / Overhevelen ' .

 

"Syphon" in English, if you put a tap at the bottom of the tube you can stop and start the flow without lots of sucking ???? 

 

And why did that immediately conjure up an image of the scene in Full Metal Jacket involving a golf ball and a garden hose (and IIRC a recruit's sister)?

[Metropolitian]

12 minutes ago, Crossy said:

 

Gluing plastics, particularly different types of plastics to one another is an art that I've never really mastered.

 

Each plastic has it's own solution. If you're all PVC then the regular Thai-pipe glue should do the job if you keep all your hole clearances small.

 

So we're in the same boat..

 

We have a visa expert, wood experts, electric experts now we need a expat that's plastic expert ????

 

 

27 minutes ago, Don Mega said:

I would use a spade bit the same diameter to drill the hole

A box with 15 sizes drills arrived last week for this purpose. ????

[stouricks]

4 minutes ago, Metropolitian said:

That I would to with another barrel for more clean water, which has a closed lid with two white screw-in closers.

And I would like to glue a female threaded adapter in one or both of them.

Pumping would happens without pressure, so yes from the barrel.

 

 

It's now with a hose and the 'gravity' method to fill buckets for the plants.

In Dutch language the method is called ' Hevel / Overhevelen ' .

 

In English it's called a SYPHON.

[Don Mega]

24 minutes ago, Metropolitian said:

So we're in the same boat..

 

We have a visa expert, wood experts, electric experts now we need a expat that's plastic expert ????

 

 

A box with 15 sizes drills arrived last week for this purpose. ????

Holesaw will work just fine but for plastics like barrells/buckets/tubs/etc etc I prefer a spade bit as it gives a tighter cleaner cut which I feel is better for helping bulk head fittings to seal.

 

Each to their own though but am sure your end result will be just fine.

[transam]

Water tank connector.......????......Take your pick,, all DIY stores have them...

 

https://www.google.com/search?rlz=1C1GCEA_enTH899TH899&sxsrf=ALeKk00LkiBTJ_DM-ezUKGropHtH56Xrvw:1588730086826&source=univ&tbm=isch&q=water+Tank+connector+photos&sa=X&ved=2ahUKEwi7luDjkJ7pAhUJSX0KHZrNBGoQ7Al6BAgMEDE&biw=1396&bih=691

[Andrew Dwyer]

11 minutes ago, Don Mega said:

Holesaw will work just fine but for plastics like barrells/buckets/tubs/etc etc I prefer a spade bit as it gives a tighter cleaner cut which I feel is better for helping bulk head fittings to seal.

 

Each to their own though but am sure your end result will be just fine.

For drilling through thin plastic these would be a better option, available on Lazada etc.

More options of hole size and IMO a cleaner cut than a hole saw or spade bit.

Usually goes up to 32mm.

 

[Don Mega]

5 minutes ago, Andrew Dwyer said:

For drilling through thin plastic these would be a better option, available on Lazada etc.

More options of hole size and IMO a cleaner cut than a hole saw or spade bit.

Usually goes up to 32mm.

 

Step drills are great for thin plastic buckets but I prefer spade bits for thicker plastic barrells and tubs.

[Andrew Dwyer]

Perhaps a bit ott for a rain water bucket but these are specifically used with bulkhead connectors for sealing liquids.

Called a bonded seal washer but more commonly known as Dowty washers. 
Designed to allow compression of the “o” ring without distortion, if you find anything similar to this it will sort you out.

 

[Metropolitian]

11 hours ago, Crossy said:

"Syphon" in English, if you put a tap at the bottom of the tube you can stop and start the flow

An excellent idea ! and it will work if the tube from inside all the way to outside is airtight.

Now, for making a mounting base on the barrel for the tap I need... glue ????

 

 

FMJ, who can forget Sarg Hartman.