Essay
Level 3 Diploma in Gas Engineering Install
- Module
- Install
- Institution
- PEARSON (PEARSON)
Level 3 Diploma in Gas Engineering Install
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Appliance type: Worcester combi boiler 32kwMeter: G4
Install 1 write-up
I arrived on site in Watford, Croxley Park at 9 am for the decommission of an old
boiler and install the install of a new Worcester combo 32kw boiler. Before the
removal of the old boiler, I carried out a visual inspection. This is important to
make sure that all visible risks or dangers are seen before starting work so that
the service that I will conduct runs smoothly. My inspection consisted of checking
the appliance for any asbestos, leak's, cracks, inspecting surfaces and internal
walls whilst also looking for signs of corrosion or overheating. When I was
satisfied that there were no visible risks or dangers, I moved onto conducting my
tightness test.
Prior to starting the tightness test I made sure that the U-gauge I was using was
in good working condition and that the water inside of it was level to zero-zero
millibar. I performed this tightness test to make sure that the installation that
was done before is safe. The first test that I performed on the meter was the let–
by test, to ensure that there is no gas that can pass through the valve when it is
turned off, so I isolated all appliances starting farthest from the meter. I removed
the screw from the test point and replaced it with the tube from the U-gauge. I
then put the ECV to the on position, to make pressure, so that the reading within
the U-gauge was at 10 mb (millibar) and then timed it to run for 1 minute. Once I
was fulfilled with my let-by test that proved no gas was passing through when
the ECV was in the off position I moved on to conducting my temperature
stabilisation. Temperature stabilisation is done to allow the water and gas in the
U-gauge to equalise in temperature so the reading from the tightness test will be
accurate.
With the tube still attached to the test point I made sure that the reading on the
U-gauge was back on its original position (zero-zero millibar). I Then turned the
ECV to the on position to allow the pressure to let the water rise to 20 mb,
subsequently timing it for 1 minute. When I was done with my temperature
stabilisation and content that my results were adequate, I moved on to the
tightness test. The tightness test is implemented to test the entire installation
(all pipework and appliances downstream of the meter) for gas escapes. Firstly, I
made sure that the U-gauge was back to the starting off point at zero-zero
millibars, then I turned the ECV to the on position to allow the pressure from the
gas to push the water in the U-gauge to 20 mb which I there after timed for 2
minutes. Finally, When the tightness test procedure was completed and I was
happy with my results, I started preparing myself for the next stage by removing
the tube from the U-gauge and replacing it with the screw immediately.
Following the tightness test I conducted a standing pressure test. Standing
pressure is the pressure of gas with no appliances running but the isolation valve
and ECV turned on. The standing pressure measured at the meter should be 19-
29 mb. I started by turning the ECV handle steadily to the fully on position, while
simultaneously taking a reading from the U-gauge. The reading I got was 25mb
which I was happy with as it was within the range it should be in.
I then continued to prepare my area of work with all my tools like my heat mat,
drills and begun power flushing the system. I then moved on to isolating the
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