Stenner 3/8 Tubing Ferrule Orientation/Torque

[LongJohn]

I recently put in a 10 gpd fixed pump to inject my sodium hypochlorite, and it is working well. I have the model with the 3/8 tubing and 100psi (duckbill) injector. The retaining nut and ferrule to mate the tubing to the injector were floating in the bag, and the documentation was a bit sparse on that part of it. I have it together and it is working but I am getting a small drip of bleach on the retaining nut after each injection run.

I put the parts on the tube end in this order: retaining nut, soft translucent ferrule with bevel toward end of tubing, firm white plastic ferrule with bevel toward end of tubing. The retaining nut engages with the soft ferrule which in turn engages the firm ferrule into the female on the injector body. End of tubing is engaged fully into the female port on the injector.

The manual talks about using a tool for a half-turn after hand tightening on the 3/8 (versus 1/4) fittings. My judgement tells me no, since they are small and plastic, and do not have flats on them that indicate they are designed for a tool to touch them.

The retaining nut and ferrule were a single captive assembly on the two that connected to the peristaltic tube on the pump head, and gentle hand-tight was perfect for them with no drips.

My plumbing experience tells me to add a 1/6 turn each day if I am still seeing a drip, but I am feeling like it is about to be too tight which of course can cause other problems.

Do I have the ferrule order/orientation wrong or do I just need to crank it down some more?

TIA

 

[kimkats]

Here is a bump for more eyes.

 

[RonsPlc]

It sounds like you did it all right.
All my tubing is 1/4", and I have no experience with the 3/8" to know if there is a difference.
I was surprised at just how little torque was needed with mine.

 

[hexabc]

I recently put in a 10 gpd fixed pump to inject my sodium hypochlorite, and it is working well. I have the model with the 3/8 tubing and 100psi (duckbill) injector. The retaining nut and ferrule to mate the tubing to the injector were floating in the bag, and the documentation was a bit sparse on that part of it. I have it together and it is working but I am getting a small drip of bleach on the retaining nut after each injection run.

I put the parts on the tube end in this order: retaining nut, soft translucent ferrule with bevel toward end of tubing, firm white plastic ferrule with bevel toward end of tubing. The retaining nut engages with the soft ferrule which in turn engages the firm ferrule into the female on the injector body. End of tubing is engaged fully into the female port on the injector.

The manual talks about using a tool for a half-turn after hand tightening on the 3/8 (versus 1/4) fittings. My judgement tells me no, since they are small and plastic, and do not have flats on them that indicate they are designed for a tool to touch them.

The retaining nut and ferrule were a single captive assembly on the two that connected to the peristaltic tube on the pump head, and gentle hand-tight was perfect for them with no drips.

My plumbing experience tells me to add a 1/6 turn each day if I am still seeing a drip, but I am feeling like it is about to be too tight which of course can cause other problems.

Do I have the ferrule order/orientation wrong or do I just need to crank it down some more?

TIA

I had been using an identical Stenner pump with 3/8 tubing as my pool chlorinator for 4 years. It worked great but I got tired of hunting for liquid chlorine and switched to SWG earlier this year. I never used any tools when connecting tubes - you don't really need to apply any force there. Here is a video which may be helpful as far as ferrule orientation: