This question would be good for the seismic bracing experts in the group: NFPA 13 and ASCE/SEI 7 address the Component Response Modification Factor (Rp) as a ductility of the system. It comes into play when determining the seismic design force using the ASCE/SEI 7 method (not the simplified method used in NFPA 13).
NFPA 13 states several times that this factor (Rp) is 4.5 for steel systems (NFPA 13-2016 A.188.8.131.52.1 and E.3). The only mention of plastic pipe systems is in Annex E.3 where it states an Rp value of 4.5 for "high-or limited-deformability piping with joints made by threading, bonding, compression couplings, or grooved couplings", and an Rp value of 1.5 for "low-deformability piping such as cast iron and non-ductile plastics". Is a Response Modification Factor of 1.5 suitable for CPVC pipe?
Posted anonymously for discussion. Discuss This | Submit a Question | Subscribe
Subscribe and learn something new each day:
Thank You to Our Top
September '20 Contributors!
Sprinkler Designer or Engineer?
Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more:
Daily discussions are open-ended fire protection, fire alarm, and life safety questions submitted anonymously for the benefit of sharing expertise and learning from other perspectives. Anyone can submit a question here:
2020 PE Prep Guide
PE Prep Series
2020 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.