Dear All,
During the site visit, I noticed that some of the sprinkler heads are decolourized, i.e. the red bulbs (68C) become transparent however the bulb is still filled with the liquid.
Is there anybody who knows what is the main reason for this case? Besides, should we replace the sprinkler head because of this decolourization or not?
Many thanks in advance.
Regards,
Alican
I have seen this condition before in rooms where sun shines through windows onto the sprinkler heads.
Excerpt from 2017 NFPA 25: A.5.2.1.1.1:
If the bulb is full of liquid, there will be a small air bubble that should be readily observable.
Taken from Minnesota State Fire Marshal – Fire Protection Section, Quick Response, December 2010:
Dear Mr. Werner,
Many thanks for your answer and clarification!
Kind regards,
Alican
Are these located in a cold environment or in direct sunlight? It's been seen that color loss can occur at low temperatures but typically returns once the liquid warms up. While it doesn't appear to affect performance, an inspector will probably fail it if they cannot differentiate between empty or due to a color loss from ground level.