Carrier EVERGREEN 23XRV Product Data page 22

Application data (cont)
Vent and drain connections
Nozzle-in-head waterboxes have vent and drain connec-
tions on covers. Marine waterboxes have vent and drain
connections on waterbox shells.
Provide high points of the chiller piping system with vents
and the low points with drains. If shutoff valves are provid-
ed in the main liquid pipes near the unit, a minimal amount
of system liquid is lost when the heat exchangers are
drained. This reduces the time required for drainage and
saves on the cost of re-treating the system liquid.
It is recommended that pressure gages be provided at
points of entering and leaving liquid to measure pressure
drop through the heat exchanger. Gages may be installed
as shown in Pressure Gage Location table. Pressure gages
installed at the vent and drain connections do not include
nozzle pressure losses.
Use a reliable differential pressure gage to measure pres-
sure differential when determining liquid flow. Regular gag-
es of the required pressure range do not have the accuracy
to provide accurate measurement of flow conditions.
PRESSURE GAGE LOCATION
NUMBER
OF
PASSES
1 or 3 One gage in each waterbox
2 Two gages in waterbox with nozzles
ASME stamping
All 23XRV heat exchangers are constructed in accordance
with ASHRAE (American Society of Heating, Refrigerat-
ing, and Air Conditioning Engineers) 15 Safety Code for
Mechanical Refrigeration (latest edition). This code, in
turn, requires conformance with ASME (American Society
of Mechanical Engineers) Code for Unfired Pressure Ves-
sels wherever applicable.
PRESSURES
Leak Test at Design Pressure*
Hydrostatic
Proof Test*
*Nitrogen/Helium.
ITEM
Shell
Tube Sheet
Condenser/Cooler Waterbox Cover
Condenser/Cooler Waterbox Shell
Tubes
Discharge/Suction
Pipe
Flanges
LEGEND
ASME — American Society of Mechanical Engineers
HR — Hot Rolled
22
GAGE LOCATION
(Cooler or Condenser)
DESIGN AND TEST PRESSURES (23XRV)
SHELL SIDE
(Refrigerant)
psig
185
—
204
HEAT EXCHANGER MATERIAL SPECIFICATIONS
MATERIAL
Finned Copper
Each heat exchanger and economizer (if equipped) is
ASME 'U' stamped on the refrigerant side of each vessel.
Relief valve discharge pipe sizing
See page 21 for number of relief valves.
Relief valve discharge piping size should be calculated
per the current version of the ASHRAE 15, latest edition,
code using the tabulated C factors for each vessel shown in
the table below.
23XRV RELIEF VALVE DISCHARGE PIPE SIZING
HEAT
EXCHANGER
COOLER
CONDENSER
Carrier further recommends that an oxygen sensor be
installed to protect personnel. Sensor should be able to
sense the depletion or displacement of oxygen in the ma-
chine room below 19.5% volume oxygen per ASHRAE
15, latest edition.
Design pressures
Design and test pressures for heat exchangers are listed
below.
STANDARD TUBE SIDE
(Liquid)
kPa psig
1276 150
— 195
1407 —
HR Steel ASME SA516 GR 70
HR Steel ASME SA516 GR 70
HR Steel ASME SA516 GR 70, SA-36, or SA-285 GRC
ASME SA675 GR 60, SA-516 GR70, or SA-181 CL70,
HR Steel
SA-36, SA-675 GR70, SAE AME 7496
ASME SB359
Steel ASME SA106 GRB
Steel ASME SA105
RELIEF
VESSEL
VALVE
FRAME REQUIRED
RATED
SIZE C FACTOR
C FACTOR
(lb air/Min)
(lb air/Min)
30 to 32 43.4 70.8
35 to 37 49.5 70.8
40 to 42 50.4 70.8
45 to 47 57.4 70.8
50 to 52 53.7 70.8
55 to 57 61.1 70.8
30 to 32 41.4 70.8
35 to 37 47.1 70.8
40 to 42 47.1 70.8
45 to 47 53.7 70.8
50 to 52 51.2 70.8
55 to 57 58.3 70.8
OPTIONAL TUBE SIDE
(Liquid)
kPa psig
1034 300
1344 390
— —
SPECIFICATION
FIELD
CONNECTION
SIZE (FPT)

1 1 /
4

1
1 /
4

1 1 /
4

1
1 /
4

1 1 /
4

1 1 /
4

1
1 /
4

1 1 /
4

1
1 /
4

1 1 /
4

1
1 /
4

1 1 /
4
kPa
2068
2689
—