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FAQ's

Q: How long does delivery take?
A: If ordered by 3:00pm, most orders are delivered next day.

Q: What means of payment do you take?
A: Debit card, Credit card, BACS or cheque

Q: Do you use Environmentally Friendly packaging?
A: Yes.  Up until January 2015 all boxes Go Geothermal Ltd has sent out have came from a recycled source.  Post January 2015, 96% of boxes come from recycled sources.

Q: How do I Pressure Test our system?
A: Please see info below:

Test Procedure for Horizontal Polyethylene Pipes (i.e. not probes) - overview

This is an overview for a test procedure for detecting leaks in small diameter PE pipes

Interpreting the pressure test:

The system test pressure should be 1.5 times the maximum rated operating pressure
(It is important not to exceed the maximum pressure rating of the lowest rated component in the system)

Removal of air from system: Fill at the lowest point and vent at the highest point wherever possible

Start filling with clean water to prevent contamination of the pipeline system.
(The slower you fill the system the more likely you will release any trapped air)

Once the pipeline system is full of water:
Isolate and leave to settle for 1hr to stabilize the system.

Start the test:
Attach the test pump, then measure the time it takes to get to test pressure and then multiply by 15 to give you your test duration:

Three point analysis test procedure is used as follows:

T1 (Reading 1) - 1 x the test duration (circa 10 minutes)
T2 (Reading 2) – 7 x the test duration (circa 70 minutes)
T3 (Reading 3) – 15 x the test duration (circa 150 minutes)

To allow for the creep behaviour (expansion / contraction) of polyethylene pipelines whilst being pressurised the graph below will give you the correct values of your pressure test.
The graph below shows a characteristic profile for a leak-tight system.

If during the period there is a falling away of pressure, this would indicate a leak within the system.

The test results should be witnessed / recorded and kept for future reference

Equipment required for pressure testing (available from Go Geothermal):

Fill &Test Pump
Filling hoses
Test ends for pipes or any connections on the system
Test tree (Pressure Gauge calibrated)

For more detailed information try WRC Type 2 Pressure Test for Water

 

Test Procedure for Probes aka Loops - overview

On-site Pressure Testing

Each loop/probe shall be pressure tested prior to and following insertion into the borehole to ensure that no damage has occurred during the transportation/installation.

All horizontal header components of the ground heat exchanger shall be pressure tested prior to backfilling, where possible. As a minimum, all joints shall remain accessible until such time as a pressure test has been completed.


Pressure Test Procedure for In Situ Loops

The test pressure for the loop shall be determined based upon the density of the grout utilised and the depth of  the installed loop.

The test procedure shall be in accordance with BS EN 805 section 11.3.3.4 which allows a modified test to be carried out for plastic pipes. The modified test shall be in accordance with WRc “A Guide to the Testing of Water Supply Pipelines and Sewer Rising Mains” 1st Edition, June 1999, Section 5, available from:

http://www.wrcplc.co.uk/default.aspx?item=339

Or BS EN 805 Annex 27, available from: http://www.bsigroup.com/en/Standards-and-Publications

The ground array shall be fully purged of air prior to the test commencing. The ambient temperature shall also be monitored during the test and notes shall be taken as to whether the pipe line is exposed to direct sunlight or other conditions which may affect the results of the test.

The tests involve pre-loading periods and main test periods. The fluid volume added to the test section shall be monitored accurately and the pressures and time shall be accurately monitored. The testing equipment shall be capable of an automated addition of water to ensure accuracy and exact duplication of each test. The test  pressures shall be attained as uniformly as possible, by a steady linear increase in pressure.

The corrected results of the WRc test shall then be plotted on a logarithmic scale and assessed for a pass or a fail as per Figure 3 below.

Figure 1: Graph of Pressure Vs Time for assessment of pass or fail during pressure test

A straight line indicates a pass and anything other than a straight line indicates the test has failed.

A test failure however does not automatically assume the array is leaking as the test could also fail due to excess air in the system that has not been purged correctly, as outlined in section 10.2. The volume of water added to the loop shall be plotted against pressure to identify whether there is still excess air in the loop during the test as outlined in Figure 4 overleaf.

Figure 2: Graph of Pressure Vs Water Volume to establish presence of excess air

The BS EN 805 Annex 27 test would be plotted on a graph as outlined in Figure 5 overleaf.

Figure 3: Graph of Pressure Vs Time as per BS EN 805 Annex 27

As different loop lengths may exhibit different pressure test characteristics, the first loop test shall be extended in order to ensure categorically that the loop does not leak and therefore to arrive at control values for pressure at  the normal testing periods, for the remainder of the loops to be tested. On reaching the end of the normal test, the loop shall be left under pressure for a minimum of a further 12 hours with periodical measurement of  pressure and plotting against the log scale.

The text above reflects the current UK Standards.

Ground Source Probe/Loop Pressure Test


 

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