13
Appendix “A”
RuptureSeal
™
Model RS-2 (940 SCFM)
for
R-11 R-113 R-123
Purpose of Table
This table will assist the installer in determining the maximum size of chiller vessel (evaporator) with a
two inch (2”) carbon rupture disk that can be fitted with the Model RS-2
RuptureSeal
™ valve.
(NOTE: PURSUANT TO ASHRAE GUIDELINES, WHEN A PRESSURE RELIEF DEVICE IS
INSTALLED IN SERIES WITH A RUPTURE DISK, THE FLOW CAPACITY OF THAT DEVICE MUST
BE DE-RATED BY 10%.)
Thus, after installation in series with a two inch (2”) carbon rupture disk, the
flow capacity rating of the Model RS-2
RuptureSeal
™ valve must be assumed to be
846 SCFM
.)
How to use Table
Obtain the
diameter
and
length
of the chiller vessel (evaporator).
Refer to the table below and locate the
“Diameter”
measurement that equals the diameter of the
chiller vessel (evaporator). The measurement to the immediate right of the evaporator’s diameter
indicates the
“Maximum Length”
of the chiller vessel (evaporator) that the Model RS-2
RuptureSeal
™ valve can be installed on after 10% flow capacity de-rating.
NOTE: TABLE REFLECTS 10% DE-RATING OF VALVE’S ACTUAL RATED FLOW CAPACITY.
Evaporator
Diameter
FEET & INCHES
Maximum
Evaporator
Length
Evaporator
Diameter
FEET & INCHES
Maximum
Evaporator
Length
Vessel
Diameter
FEET & INCHES
Maximum
Evaporator
Length
2’ 6”
or less
25’ 5”
3’ 4”
19’ 0”
4’ 2”
15’ 3”
2’ 7”
24’ 7”
3’ 5”
18’ 7”
4’ 3”
14’ 11”
2’ 8”
23’ 10”
3’ 6”
18’ 2”
4’ 4”
14’ 8”
2’ 9”
23’ 1”
3’ 7”
17’ 9”
4’ 5”
14’ 5”
2’ 10”
22’ 5”
3’ 8”
17’ 4”
4’ 6”
14’ 1”
2’ 11”
21’ 10”
3’ 9”
16’ 11”
4’ 7”
13’ 10”
3’ 0”
21’ 2”
3’ 10”
16’ 7”
4’ 8”
13’ 7”
3’ 1”
20’ 7”
3’ 11”
16’ 3”
4’ 9”
13’ 4”
3’ 2”
20’ 1”
4’ 0”
15’ 10”
4’ 10”
13’ 1”
3’ 3”
19’ 6”
4’ 1”
15’ 7”
4’ 11”
12’ 11”
5’ 0”
12’ 8”
NOTE: Calculations are based on BSR/ASHRAE Standard 15-1992R - Section 9.7.5
Warning:
The above calculations are NOT APPLICABLE if combustible materials are
used within twenty (20’) feet of the chiller vessel (see BSR/ASHRAE 15-1992R).