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Old 25-06-2016, 21:24   #1
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Installing a fitting to a stainless steel water tank

Hi I have recently installed a watermarker and need to add a hose fitting to the top of the stainless steel water tank.

Does anyone know how to do this specifically do you thread the hole, i'm guessing so as there is no way of getting bolt inside. Also how do you stop the metal filings from going in the tank?

It will be for 13mm hose.


Thanks
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Old 25-06-2016, 22:01   #2
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Re: Installing a fitting to a stainless steel water tank

Mmmm. Sorry for a silly question, but why don't you use an adapter on the existing input? and avoid drilling, etc.?

Ann
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Old 25-06-2016, 22:20   #3
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Re: Installing a fitting to a stainless steel water tank

I have silver soldered a thick, threaded washer to a thin walled SS tank then used a hole saw without a pilot bit to thin the tank wall until I could penetrate and pry out the small circle of SS sheet metal then run a tap through before screwing a brass fitting in.


Worked OK but it is sometimes difficult to get even silver solder to take to SS.


I will be making a wall mounted coolant header tank out of the food tray from a bain-marie using this technique in the near future.
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Old 26-06-2016, 03:49   #4
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Re: Installing a fitting to a stainless steel water tank

if you have a filter on the outlet of the tank, it won't matter if you get swarf in the tank. I have considered drilling a hole and inserting a grommet. then use a right angled barbed fitting (the one they use for irrigation hoses). These form a good seal with the grommet, but I would be tempted to put some glue there too. you might screw a saddle clamp over the hose near the inlet. Use tec screws or even sharp pointed screws. Avoid using a standard twist bit as they rarely give a neat, round hole. Hole saw is better. smooth off edges
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Old 26-06-2016, 04:57   #5
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Re: Installing a fitting to a stainless steel water tank

If you're going to use glue, use epoxy. Works great.

Ann
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Old 26-06-2016, 05:20   #6
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Re: Installing a fitting to a stainless steel water tank

Heres a whole selection of fittings specifically for the task at hand

http://www.mcmaster.com/#bulkheads/=130q3kc


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Old 26-06-2016, 09:42   #7
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Re: Installing a fitting to a stainless steel water tank

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Originally Posted by Sailmonkey View Post
Heres a whole selection of fittings specifically for the task at hand

McMaster-Carr
Bulkhead fittings can't be installed without access to both sides of the tank wall.
The OP wants to do a blind installation.
Tapping won't work either, tank walls are typically thinner than the thread pitch would be.

Teeing into the existing fill hose would be easiest.
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Old 26-06-2016, 09:56   #8
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Re: Installing a fitting to a stainless steel water tank

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Originally Posted by Ann T. Cate View Post
Mmmm. Sorry for a silly question, but why don't you use an adapter on the existing input? and avoid drilling, etc.?

Ann
Yes... just tap into the vent hose. Never did it any other way.
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Old 26-06-2016, 10:21   #9
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Re: Installing a fitting to a stainless steel water tank

That fitting needs to be TIG welded into the SS tank. Obviously needs to be removed and taken to a welding shop that does TIG process. There are weld on fitting that are designed to provide a coupling in normal pipe sizes to a thin walled tank, sort of a thick threaded washer to improve surface area. Also probably should be the same type of SS as the parent tank.
Do the job, do it correctly, do it once, and be happy with it for as long as you have the Vessel.
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Old 26-06-2016, 10:35   #10
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Re: Installing a fitting to a stainless steel water tank

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Originally Posted by Burge View Post
Hi I have recently installed a watermarker and need to add a hose fitting to the top of the stainless steel water tank.

Does anyone know how to do this specifically do you thread the hole, i'm guessing so as there is no way of getting bolt inside. Also how do you stop the metal filings from going in the tank?

It will be for 13mm hose.


Thanks
Also, if you have an access cover, you can install a thru hull type fitting after drilling a hole. Just push the mushroom fitting out thru the hole from the inside and put the nut on the outside. But there is really no reason not to just install a T in the vent hose.
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Old 26-06-2016, 10:47   #11
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Re: Installing a fitting to a stainless steel water tank

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Originally Posted by Ann T. Cate View Post
Mmmm. Sorry for a silly question, but why don't you use an adapter on the existing input? and avoid drilling, etc.?

Ann
Ann
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Old 26-06-2016, 12:19   #12
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Re: Installing a fitting to a stainless steel water tank

Quote:
Originally Posted by Burge View Post
Hi I have recently installed a watermarker and need to add a hose fitting to the top of the stainless steel water tank.

Does anyone know how to do this specifically do you thread the hole, i'm guessing so as there is no way of getting bolt inside. Also how do you stop the metal filings from going in the tank?

It will be for 13mm hose.


Thanks
Installed mine in the water outlet from than tank to the pump intake on 2 different boats, no issues no need to mess with the tank
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Old 26-06-2016, 15:24   #13
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Re: Installing a fitting to a stainless steel water tank

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Installed mine in the water outlet from than tank to the pump intake on 2 different boats, no issues no need to mess with the tank
According to all the experts in my thread "Watermaker Product flow pressure" you have just commited a major booboo doing this and you will be punished by sinking your boat or ruining all sorts of expensive equipment not too mention invaliding all your warranties. but I'm with you on this one.
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Old 26-06-2016, 23:26   #14
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Re: Installing a fitting to a stainless steel water tank

t fitting in the existing line with tap on the wm side to isolate the wm if needed
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Old 27-06-2016, 06:42   #15
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Re: Installing a fitting to a stainless steel water tank

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According to all the experts in my thread "Watermaker Product flow pressure" you have just commited a major booboo doing this and you will be punished by sinking your boat or ruining all sorts of expensive equipment not too mention invaliding all your warranties. but I'm with you on this one.
My second install already had fitting provided at the pump intake for this purpose along with breaker and wiring, just had to install.
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