In my loft there is a 25-gallon circular cold-water tank, at least 40 years old. I've just fitted it with a new lid - it never had one before, just the insulation jacket stretched over it. There is a hole in the lid for the 'vent pipe' (correct term???) from the HW cylinder in the room below, but the position and angle of this pipe is causing trouble now, as it's not allowing the lid to sit properly.
The vent pipe rises vertically to about 2' above the top of the tank, then bends 90 degrees and runs horizontal about a foot, then bends downwards at about 45 degrees and slopes down into the tank. I want to alter the end of the pipe so that it goes down vertically through the lid hole when the lid is properly fitted.
Not wanting to try to bend the existing pipework and risk distortion and/or breaking a joint somewhere, I propose simply to cut it off near the top of the vertical riser and make up a new section to run horizontal out to above the tank, then go down vertical and thru' the hole in the lid. Does it matter if the pipe goes down towards the tank vertically, or does it need to be on a slope for any reason? Anything else that I should take care to do/avoid please?
The vent pipe rises vertically to about 2' above the top of the tank, then bends 90 degrees and runs horizontal about a foot, then bends downwards at about 45 degrees and slopes down into the tank. I want to alter the end of the pipe so that it goes down vertically through the lid hole when the lid is properly fitted.
Not wanting to try to bend the existing pipework and risk distortion and/or breaking a joint somewhere, I propose simply to cut it off near the top of the vertical riser and make up a new section to run horizontal out to above the tank, then go down vertical and thru' the hole in the lid. Does it matter if the pipe goes down towards the tank vertically, or does it need to be on a slope for any reason? Anything else that I should take care to do/avoid please?