pressure drop

Firstly, thank you to everyone who commented on the last post with regard to this issue ... the post were appreciated. Just to recap I have a pressurized central heating system which is losing pressure ... an engineer having checked the system informed me that I have a leak under the floor (the...

Hi Everyone I am new here! I hope I can get some help with a problem that I have had with my sealed system since it was installed in October 2011. I am in London SW8 and have a problem with my heating system that I have been unable to solve. I have 2x Heatrae Sadia MEGAFLO 145litre...

Hi Everybody, New to the forum here. I have a question I could please use some advise on. I have a megaflow in a 4 bedroom house with two bathrooms next to each other on the first floor(onsuite and main) If the bath is running and someone flushes either of the w/c's the water flow...

Excessive pressure drop in Megaflo UV Mark 1 2002 My first posting on this website and I apologise for it being a long one: A domestic hot water set up first installed in June 2002. It has given us nothing but headaches for 10 out of the last 12 years. At first it was the usual thing –...

Hi I am asking this for a work mate neither of us are plumbers. Boiler runs at 0.5bar normally. Just recently the pressure drops and boiler cuts out after 10 minutes. We cant see any leaks.There is a slight leak from overflow pipe. Boiler is about 18 months old and plumber who installed it...

Hello, i have a theoretical question: Let's say i have a tap served by a pipe running horizontally for 50 meters. The pipe is served by the main water line through a ball valve. Both the pipe and the ball valve are 15mm in diameter. As far as i know, there's a constant pressure drop along the...

Vokera 14e losing pressure. (Bungalow) Replaced heat exchanger, both HW and CH motorised valves and actuators, PRV, expansion vessel, high limit thermostat, both inlet and outlet service valves and circuit board. No above floor leaks apparent. Switched off electrical power to unit. With system...

Your opinions, please. I was taught that when fitting a new appliance it is permissible to leave a pressure drop unrectified as long as it existed before you fitted the appliance. So, if you have a 1mb drop across existing pipework to an appliance, and after fitting a new appliance it is...

I was hoping you'd be able to help me shed some light on a problem. We've lived in our house for 8 years, in that time the pressure has dropped maybe 5 times and the boiler needed topping up and restarting. Unfortunately the boiler is in the loft, but i'm not fussed about climbing up there...

Hi. Before I dig up floor, pressure has dropped from 3 bar to 1.8 over 12 hrs on a 25m length of new MDPE (wondering if this stuff expands hence drop?). Obvious pipes and test gear dry. What would you do?? Ta. (Ducted from house to garage, not from road)

Hi guys Advice appreciated. We had a new kitchen fitted 2 months ago with Perrin and Rowe bridge tap. Yesterday I turned on the cold tap, it made a brief clunk / knock sound and then the water flowed about half pressure. It has remained that way. The tap is about 1m from a stopcock, which I...

The pipe from my gas meter to my Worcester combi boiler is 22mm. It is 16m long and has 6 right angle bends after the meter. Does anyone know the formula for calculating pressure fall from coming into themeter at 21mb to arriving at the boiler?

I've got my gas safe inspection on thursday and because i've just started business again, i've not got much to show the inspector. I'f got a service booked in and I was going to go over my boiler at home. Most people are aware that new boilers suffer a drop across the gas valve, but I cannot...

Anyone got the friction losses for 32mm and 63mm MDPE on natural gas please? I seem to have details for everything but.... Haven't yet managed to find it on Google either, Thanks

Hi, Have a bit of a strange problem with a baxi duotec 28. When the CH is turned on the pressure instantly drops by 1/2 bar. All rads get hot and seems to be working fine. Over several weeks the pressure is gradually dropping so needs topping up. The expansion vessel is fine and there are no...

Hi I was at a Baxi Megaflow with 1 bar system pressure on the gauge standing cold, but when the boiler was turned on the gauge dropped to .3 What does this mean or show ?

Hello Plumbers Forum, My Boiler is a Glow-Worm 30 cxi Condensing Combination Boiler. It was installed in 2005. The boiler pressure normally - that is when the central is not on, is between 1.0 and 1.6 bar. In the last few days it dropped to 0.8 bar. I adjusted the supply and it went up very...

Hi everyone, Im Mark, new to the forums, and definitely not a plumber. Lowly sparky here. Basically, i have had a problem with my boiler losing pressure. Easy enough to refill etc, but the pressure drop occurences are becoming more frequent. I assume its due to a leak on the system but i cant...

I tried to install an exterior stop tap on my lead mains supply so I could turn off the water supply to my building. I have a shared mains, so I've been unable to turn the water off to my property without also turning off the supply to my neighbours. I dug down to find the lead main coming...

I've got a problem with a customer's Vallient Tubo Max 242/ie. Basically its loosing pressure gradually. when i've gone and had a look and repressurised the system I've noticed that when dhw is drawn off the sink tape, the needle on the gauge jumps up slightly then settles down at a lower...