In-Service Testing
cont.
26
Need help? Give us a call on 0330 026 6273 and speak to one of our trained advisors.
Annex F of D 08 (informative)
Frequency of In-service tests
General
In the absence of any other instruction or guidance on the means of
determining the appropriate frequency of in-service testing, the following
procedure may be used:
a) 6 to 8 weeks after commissioning carry out the tests in ‘In-Service
Tests’.
b) 12 to 15 weeks after commissioning carry out the tests detailed in ‘In-
Service Tests’.
Depending on the results of the above tests, several possibilities exist:
a) If no significant changes (e.g. <1K) in mixed water temperatures are
recorded between commissioning and 6 to 8 week testing, or between
commissioning and 12 to 15 week testing the next in-service test can
be deferred to 24 to 28 weeks after commissioning.
b) If small changes (e.g. 1 to 2K) in mixed water temperatures are
recorded in only one of these periods, necessitating adjustment of the
mixed water temperature, then the next in-service test can be deferred
to 24 to 28 weeks after commissioning.
c)
If small changes (e.g. 1 to 2K) in mixed water temperatures are
recorded in both these periods, necessitating adjustment of the mixed
water temperature, then the next in-service test should be carried out
at 18 to 21 weeks after commissioning.
d) If significant changes (e.g. > 2K) in mixed water temperatures are
recorded in either of these periods, necessitating service work, then
the next in-service test should be carried out at 18 to 21 weeks after
commissioning.