From a sprinkler contractor in the UK - We have a British Standard BS 9251 which is based (loosely) on your NFPA 13 D/R for the use in houses, flats and care homes and so on. One area which is very grey to us and not included in the design standard is the distance from obstructions such a pendant lampshade which lower than the ceiling or a smoke detector or emergency light fitting.
I know most contractors are using 300mm (1 ft) as a minimum from a pendant drop light fitting but then you ask them why no one can tell you. for other obstruction such as a smoke detector many any using 4 times the depth as a method.
For beams and larger continuous obstructions, it's much easier as most just use a bean rule in EN BS 12845 (our equivalent NFPA 13).
I would be very interested in understanding the approach which you take for such things and very much looking forward to your assistance.
Posted anonymously by a member for discussion. Discuss this | Subscribe.
Subscribe and learn something new each day:
Thank You to Our Top September Contributors!
Sprinkler Designer or Engineer?
Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more:
Daily discussion questions are open-ended questions posed by members for the benefit of sharing expertise and learning from other perspectives. Join as a member here.
2019 PE Prep Guide
PE Prep Series
(Click to enlarge)
Visit July-October for daily Fire Protection PE Exam sample questions.
Solutions are posted the day after posting.
Comment with your solutions, questions or clarifications.
Please note that questions posted are unofficial and in accordance with NCEES rules are intended to be similar to actual exam questions, not actual exam questions themselves.