How to connect MDPE Fittings?

[kristen]

I'm installing some MDPE pipe around the garden so we have taps ithin easy reach of all parts of the garden, as per this thread:

http://www.navitron.org.uk/forum/index.php/topic,13845.0.html

I'm sure this is a numptie question, but how do you fit MDPE connectors?

I've put the plastic insert into the pipe, and banged it in all the way.

I've slid the outer screw collar onto the pipe ...

... and then put the inner split collar onto the pipe.

I haven't done it up supper tight, but it leaks.

I tried to get the leading-edge of the inner split-collar flush with the end of the blue pipe (i.e. not prutruding, nor making contact with the flange on the white insert, but I may have got it a bit far forwards.

I wonder if I should actually site it some distance back from the leading edge of the blue pipe in order that the outer screw collar engages long ebfore all of its threads are actual brought into service?

Somewhat amazed I haven't been able to find YouTube videos showing the process in intimate details uploaded by loads of nerdy people!

Here are some stills:

First is the pipe with the insert "inserted".  This has been done up, and undone, hence the groove created by the inner split-collar.

Second is the position I have been putting the inner split-collar - leading edges of split-collar and blue-pipe "flush", although trying to re-engage the groove with the "thread" on the inside of the split-collar it does seem like I had it a bit further forward than that.

[Justme]

No wonder its leaking.

You need to slide the screw ring & the grip ring up the pipe. Then fit the pipe into the fitting. It needs to go in about an inch it does take some pushing with some fittings. Make sure that the rubber washer / ring has not been pushed out of place. The grip ring should be biting the pipe nearer two inches from the end. I tend to slide the grip ring towards the fitting but not all the way to the fitting so that when you tighten the screw ring it can pull it all together.

[Alan]

How did you cut the pipe. With a pipe cutter. ?

That line should not be on the outside of the pipe.
Just use a hacksaw.

Then pipe pushes inside fitting about 20mm. The white grip taper should be about 20 mm
along the pipe.

Regards

Alan

Edit : just noticed that they are not your pictures.
That line has never been on any fittings I have used.

[kristen]

How did you cut the pipe. With a pipe cutter. ?

I used a saw

Edit : just noticed that they are not your pictures.

Not sure about that bit? These are photos I took on my camera (sorry, maybe I misunderstood your meaning?)

[clockmanFR]

In an ideal situation just take off the nut from the joint and slide it down the pipe, the serration bit should stick or stay in the nut.
Now use your finger or pencil and feel where the pipe should reach within the joint and pencil mark the pipe accordingly. The pipe should have no marks or scratches on it as it needs to slide in and through a rubber O ring. Some times a bit of water helps ( i use my spit) and wipe it around on the internal rubber seal O ring.
Hold the joint and push hard the pipe into the joint until it reaches the pencil mark, the pipe must go pass the rubber seal.
Sometimes on the 32mm pipe i slightly file a chamffer on the end so it will slide passed the rubber seal a little easier.
Slide the nut up with the internall collar and hand tighten, (it is the rubber seal that holds the joint from leaking and the collar and nut stop the pipe from being pulled out)
A tech chap with plasson informed me that the inserts are only necessary to stop the joint from pulling apart, ie to stop a JCB pulling the joint apart.
Here in France water pipe is twice the thickness and inserts are not used.
Push Hard.

[Alan]

You are pushing the pipe inside the fitting. Past the O ring

On a 32 mm fitting the pipe should push 35 mm inside the fitting.
Which means the white taper bit in your picture should be 35 mm
away from the end of the pipe.

Will post some pictures if required.

Regards

Alan

Edit :

Picture.

[kristen]

Ah! "Push the pipe into the fitting past the O-ring".

I saw the O-ring, so I reckon I know what you mean.

Definitely didn't push the pipe into the fitting though.

I'll try that tomorrow and report back.

Thanks folk, amazing helpful as always.

[Justme]

Make sure that you re cut that end first.

The groove will damage the rubber & you will still have a leak.

[guydewdney]

if this is low pressure - gravity / sub pump type pressure, you dont need the inserts on 32mm pipe. Saves a bit of time/money