T4TS Scenario 3

[herbert]

Soundness check This is a simple version of the full soundness check cutting out the time waiting section, for this scenario we ask you too COLD SYSTEM fit a gauge measure the pressure, turn on a cold tap recheck pressure, turn off tap recheck pressure, remove gauge. HOT SYSTEM as above but this time we will seal the system so we can apply pressure, so you need to cap the open vent, close the gate valve in the airing cupboard and most important of all shut down all forms of heating the water, this should be done first. To fit the gauge click on the washing machine HOSES

 

[rk660]

Walkthrough Scenario3
This worked for me.
Isolate and replace both dripping taps first...check to see they are working.
Then do a visual check of both systems....top to bottom....don't miss a thing...inspect everything as in scenario 2.
Then cap the vent in the loft.....turn off the boiler....isolate the hot water wheel in the airing cubboard.
Return to kitchen sink and click on the washing machine pipes (cold and hot)...isolate them..connect the kit...unisolate them and do the pressure tests.
Finally make sure all isolation valves are open....the vent is uncapped...the hot water in the airing cupboard is turned back on....finally turn the boiler back on....close all the doors and leave a happy house.....and bobs your uncle
Hope this helps

 

[tamz]

What pressure do they ask you to test the hot at in these scenarios?

 

[rk660]

Hi
1.5-2 times working pressure on the hot ....and the cold is direct in this case,so its mains pressure.

 

[tamz]

They are giving you ill thought out training and information as the maximum test pressure would depend on the rating of the cylinder.
Most vented hot water cylinders fitted are grade 3 but sometimes you will find grade 4 and sometimes others.
Maximum test pressure on a grade 3 is 1.45 bar and maximum working pressure is 1 bar.
Grade 4 max test pressure is 1 bar and max working pressure is 0.6 bar.

Here is a scenario more like real life.
3 story town house, hw cylinder on mid floor.
The working pressure on the pipes below the ground floor would be in the region of 1 bar, the pressure on the hw cylinder will be approx 0.6 bar. Say it is a grade 4 cylinder which would be on the limit of its working pressure but ok.
Test that at 1.5 - 2 bar and you may need a mop and an insurance claim form.

Check and think before you do anything and don't blindly follow what you are being taught.

 

[rk660]

Hi
I completely agree with you...I have found many discrepancies between the teaching and real life...but for this scenario that is what they ask for...

 

[PlumbBobBob]

i still think it is a poor way to learn imo.

 

[Osp]

Hot washing machine supplies are also a dying breed now.

 

[AlexusBa]

How do you actually conduct the system soundness test?

I am now aware that you must insert the pressure gauge at the service pipe of the washing machine, and the hot water works at 1.5 bar but the cold water is reading 10 bar which is well out of the normal range.

How do I rectify this and again then continue to conduct the system check?

 

[ShaunCorbs]

if you dont know im sorry get someone in as its unlikely you have a 10bar cold water system