The minimum number of sprinkler heads that need to be tested will depend on the size of the system. This is in accordance with the LPC Rules for Automatic Sprinklers 2015 incorporating BS EN 12845, Clause 20, Annex K and LPC Technical Bulletin TB203.
The LPC Sprinkler Rules for Automatic Sprinkler Installations is the UK’s most significant sprinkler installation standard which incorporates the full BS EN 12845:2015+A1:2019 standard and related Technical Bulletins.
The number of sprinkler heads to be removed for testing is detailed in Table K.1 and TB203.T1:
| Total number of sprinklers within installation or System |
Number of sprinklers to be removed & inspected |
| Less than or equal to 5,000 |
20 |
| Less than or equal to 10,000 |
40 |
| Less than or equal to 20,000 |
60 |
| Less than or equal to 30,000 |
80 |
| Less than or equal to 40,000 |
100 |
Following an update in September 2022, TB203.T1 now incorporates the following notes:
Note 1: Where there are different types of sprinkler heads installed which have been in service for 25 years, a minimum of 5 sprinkler heads of each different type shall be removed and tested.
Note 2: A batch of 20 sprinkler heads removed for testing shall consist of no more than 4 different sprinkler head types. Where more than 4 types are installed, 5 sample sprinkler heads for each additional type shall be tested (e.g., 6 different sprinkler head types would require a minimum of 30 sprinkler heads to be tested).
Note 3: Where there are sprinkler heads in the spares cabinet which are 25 years old, a minimum of 5 of these spare sprinkler heads shall be tested, in addition to the sample numbers listed in Notes 1 and 2.
With reference to mixed batches of sprinkler heads
The testing of smaller batches will highlight any problems associated with the sprinkler. However, the validity of the results can be somewhat reduced based on batch size.
Wherever possible, batches of sprinkler heads should include as many of the same type (make, model, year) for testing from variable locations (different conditions due to the environment installed) for consideration and full evaluation.
Where sites have multiple different sprinkler head types, a minimum of five of each type shall be submitted for testing. If in doubt, the FPA is happy to discuss site-specific cases to agree on a practicable testing regime.
To find out more about how we can assist you with ensuring your sprinkler system is working as it should, please complete the form below, email sprinklers@thefpa.co.uk, or call 01608 812 537.