Design and Installation
October 2014
4-8
06-236115-001
4-2.2.8
Using the HFC-227ea Concentration Flooding Factors
To find the total quantity of HFC-227ea required at a specific temperature and concentration,
multiply the hazard area volume by the multiplier from Table 4-4 and Table 4-5 that
correspond to the design temperature and concentration desired.
Note: NFPA 2001, 2012 Edition and the U.S. Environmental Protection Agency Significant New
Alternatives Policy (SNAP) provide specific guidelines for using HFC-227ea. The mini-
mum use concentration for total flooding applications is 6.7% w/v, unless a higher con-
centration is required for the specific hazard being protected.
The agent required must be based on the lowest expected ambient temperature in the
protected space. Care must be taken that the calculated concentration for normally oc-
cupied spaces at the highest expected ambient temperature in the space does not ex-
ceed the value of 10.5% per NFPA 2001.
Per NFPA 2001, HFC-227ea systems with use concentrations below the NOAEL (9% w/v) are
permitted for use in occupied areas. HFC-227ea can be designed between 9% and 10.5% for
a five minute exposure using the PBPK model.
4-2.2.9
Manifolds
When multiple cylinders are needed, they may be connected to the same set of distribution
piping through a manifold. This is necessary in three circumstances.
•
A connected reserve supply of HFC-227ea is required.
•
The quantity of agent required is greater than the maximum fill of a single cylinder.
•
A single cylinder does not contain enough nitrogen to discharge the required agent through
the pipe network.
In accordance with standards set by NFPA 2001:
•
All cylinders are of the same size and quantity.
•
Each cylinder must have an El-check or swing-check to prevent back flow of agent through
the discharge hose, in case the system is discharged while a cylinder is removed for main-
tenance.
Standard check valves MUST be installed and modeled in the latest version of the flow
calculation software program whenever any of the following conditions exist.
•
Multiple cylinders are required
•
A connected reserve supply is required
•
Multiple cylinder actuation from a master HFC-227ea cylinder
Содержание ECS
Страница 3: ......
Страница 9: ...THIS PAGE INTENTIONALLY LEFT BLANK October 2014 vi 06 236115 001 ...
Страница 19: ...October 2014 xvi 06 236115 001 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 25: ...October 2014 1 6 06 236115 001 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 63: ...Component Description October 2014 3 36 06 236115 001 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 103: ...Design and Installation October 2014 4 40 06 236115 001 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 137: ...Post Discharge Maintenance October 2014 6 18 06 236115 001 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 148: ...P N 06 236115 001 A 1 October 2014 APPENDIX A MATERIAL SAFETY DATASHEETS ...
Страница 167: ...October 2014 A 2 P N 06 236115 001 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 168: ......
Страница 171: ......
Страница 173: ...July 2016 ii 06 236115 003 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 186: ......
Страница 189: ......
Страница 191: ...August 2016 ii 06 237553 001 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 198: ......
Страница 201: ......
Страница 203: ...May 2016 ii 06 236115 004 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 211: ...May 2016 8 06 236115 004 THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 212: ......