Cut flow and return pipes

[Craigy boy]

Hi , need to cut flow and return pipes and hot and cold pipes from boiler to put back into wall vertically approx 3 inches , the pipes in question are 400mm below combi boiler but approx 4mts in distance horizontally , if I was to drain a radiator (I don’t have a drain valve ) would this remove the water sufficiently so I can cut into them and reroute or do I need to do something else ? The radiators are on main level and the boiler and pipes are attic level
Any help would be beneficial to me

 

[Ric2013]

Probably, though sometimes pipework goes down and then up.

You could also use a self-cutting drain valve (or drill a small hole to check for water present) where you intend to make your cuts anyway. Don't leave the self-cutting valve plumbed in, but can be handy for draining down if you don't have enough towels to deal with a potential spillage.

 

[Craig boy]

Ric2013 thanks , the pipes definitely don’t go up and down as I can trace them from boiler to where I need to cut etc , so on the face of that you think draining 1 rad would take enough water out those pipes to allow me to cut ? Pipes are 22mm where I need to be , self cutting sounds a great option though thanks