Removing arrestor

[Standfreepaddy]

I have an Altecnic PV016RS shock arrestor installed just after my stop cock. Paradoxically, i think it's causing banging in my pipes - i think these are meant to be installed close to a tap or appliance? Its far away from anything!

Anyway I want to simply remove it and see if it improves things. Can i just shutoff the water and unscrew it, and replace with a threaded cap (with a strip of ptfe tape)? Any idea what size and gender cap i need? Thanks

 

[Daveydub]

I would first of all
Turn off water and open tap to release pressure.
Attach compressor/foot pump/bike pump to shock arrestor and pump up to 3.5 bar.
Turn water back on and see if problem has gone away.
Check that your stop tap is open all the way and back 1/2 turn

 

[Standfreepaddy]

That’s for your advice, but I have tried all that! Not helped really. Just want to try removing it.

 

[Daveydub]

Then plan A is certainly possible.
If you have a combi boiler many manufacturers insist on a mini ev being fitted.

It is often a failing ball valve that causes noise problems or a dripping 1/4 turn tap.

You could try pump up ev to 1 bar then turn mains back on & see what pressure the ev is now.
This is your incoming pressure.
Now turn water off and release pressure and pump up ev to 10% less than incoming pressure.
See what happens then.

 

[Standfreepaddy]

Ok, I may try this. I’m assuming completely depressurising it would be the same as if an arrestor weren’t there at all?

However, if I were to remove my guess would be to use a 1/2” male cap like this:

Flomasta Male Flanged Plug 1/2" x - Screwfix

Order online at Screwfix.com. Male BSP brass flanged plug. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

The data sheet doesn’t mention thread size, so it’s a complete guess!

 

[Daveydub]

I believe that no. is a 15mm compression so this would be your man

Flomasta Brass Compression Stop Ends 15mm 2 Pack - Screwfix

Order online at Screwfix.com. Stop ends. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

It could be that someone has removed the nut & olive & screwed the 1/2" thread directly into a female fitting in which case you can put ptfe around the male thread of that stop end and screw this in its place

As you say with water still on releasing pressure from ev will give you effectively no ev as would pumping it up to 12 bar.

 

[Standfreepaddy]

Thanks for all that, I reckon I will just try fiddling with the pressure first and see how I go! This is perhaps the safest option…