SRL Product Data
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
PDS SRL
Self-Regulating
Low Temperature
Heating Cable
Maintains up to
Output
150°F
Withstands up to
185°F
• Self-Regulating, Energy
Efficient
Cut to Any Length in Field
• 16 AWG Buss Wire
Can be Single Overlapped
Temperature
Low Temperature
Self Regulating
Description
• Circuit Lengths to 660
Feet
• Process Temperature
Maintenance to 150°F
(65°C)
• Maximum Continuous
Exposure Temperature
(Power Off) 185°F (85°C)
• Industrial Freeze
Protection Applications
• Freeze Protection of Fire
Protection System Piping
Chromalox SRL self-regulating heating
cable provides safe, reliable heat tracing for freeze protection of pipes,
valves, tanks and similar applications.
Constructed of industrial grade 16
AWG buss wire with a tinned copper
braid and optional overjacketing, SRL
ensures operating integrity in Div. 2
hazardous environments as well as
certain corrosive industrial environments. SRL heating cable has a maximum maintenance temperature rating
of 150°F (65°C).
Features
• Energy efficient, self-regulating SRL
uses less energy when less heat is
required.
• Easy to install, SRL can be cut to
any length (up to maximum circuit
length) in the field.
• Field Splicing Without
Disrupting Heat Output
• 3, 5, 8 and 10 Watts per
Foot
• Field splices can be performed
easily in minutes with no scrap or
wasted cold sections.
• SRL features lower installed cost
than steam tracing, less maintenance expense, and less downtime.
• SRL can be single overlapped
without burnout, which simplifies
heat tracing of in-line process
equipment such as valves, elbows
and pumps.
• Because SRL is self-regulating,
overtemperature conditions are
virtually impossible.
• Chromalox termination, splice,
tee and end seal kits reduce
installation time.
• UL listed for use on fire protection
System piping
• 120 and 208-277 Volts
Available From Stock
• Approximate Size
3/8" x 1/8"
• Minimum Bend Radius is
1-1/8"
®
®
PRECISION HEAT AND CONTROL
PH: 1-888-996-9258 • FX: 615-793-3563
www.chromalox.com
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
©
2004 Chromalox, Inc.
410-795-2223
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
SRL — Self-Regulating Low Temperature Heating Cable
Construction
Twin 16 AWG Copper Buss Wires .................. Provide reliable electrical current
capability.
Semiconductive Polymer
Core Matrix ............................................................. “Self-Regulating” component of the
cable, its electrical resistance varies with
temperature. As process temperature
drops, the core’s heat output increases;
as process temperature rises, the heat
output decreases.
Water Resistant
Polyolefin Jacket ................................................... Flame retardant, electrically insulates
the matrix and buss wires and provides
resistance to water and some inorganic
chemical solutions.
Tinned Copper Braid ........................................... Provides additional mechanical protection
in any environment, and a positive
ground path.
High Temperature
Fluoropolymer or TPR Overjacket ................... Corrosion resistant, flame retardant
(Optional)
overjacket is highly effective in many
environments. TPR coatings protect
against certain inorganic chemical
solutions. Fluoropolymer coatings are
used for exposure to organic or corrosive
solutions. These coatings also protect
against abrasion and impact damage.
Approvals
FM - Factory Mutual approved for ordinary areas.
UL Listed, CSA Certified for ordinary areas.
UL Listed for fire protection system piping
FM approved for hazardous (classified) areas when
used with Chromalox accessories:
• Class I, Div. 2, Groups B, C, D (gases, vapors)
• Class II, Div. 2, Groups F, G (combustible dust)
• Class III, Div. 2 (easily ignitable fibers and filings)
• 3 Watt rated T6 temperature class
• 5 and 8 Watt rated T5 temperature class
• 10 Watt rated T4A temperature class
CSA Certified for hazardous (classified) areas when
used with Chromalox accessories:
• Class I, Div. 2, Groups A, B, C, D;
• Class II, Div. 2, Groups F, G
Applications
•
•
•
•
2
Process Temperature Maintenance
Freeze Protection of Pipes
Freeze Protection of Fire Protection System Piping
Fluid Flow and Viscosity Maintenance
Chromalox
®®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 1-800-443-2640 • FX: 615-793-3563 • www.chromalox.com
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
Self-Regulating Low Temperature Heating Cable – SRL
Heating Cable System Design
1. Calculate Heat Loss
Using the Chromalox Design Guide (PJ 304) for Heat Tracing, calculate the heat loss of the system. To calculate the
heat loss (Watts) you will need to know pipe diameter, insulation type and thickness, minimum ambient temperature
and the pipe maintenance temperature.
2. Select Cable Rating
After calculating the heat loss in the pipe and adjusting for any application deviations, you may determine which
cable rating to choose. Using the SRL Thermal Output Ratings graph, select the lowest cable rating that will provide
the pipe maintenance temperature. Adjust the cable output for line voltage if necessary. See figures from output
wattage at alternative voltages table on page 5.
Thermal Output Ratings On Insulated Metal Pipe
14
13
12
11
10W / Ft
10
Heat Output (W/Ft.)
9
8W / Ft
8
7
5W / Ft
6
5
3W / Ft
4
3
2
Cable Output vs.
T
Temper
ature
r
1
0
10
20
30
40
50
60
70
80
90
100 110 120 130 140 150
Pipe T
Temperrature (°F)
Chromalox
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 1-800-443-2640 • FX: 615-793-3563 • www.chromalox.com
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
3
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
SRL — Self-Regulating Low Temperature Heating Cable
3. Determine Total Cable Length
In addition to the system piping, in-line equipment such as valves, flanges and pipe supports require additional heat
tracing to maintain the system operating temperatures.
Total feet of traced pipe + Cable allowance for components = Total cable length
Component Cable Allowances
Component
Cable Allowance (Ft.)
Flange Pair
Pipe Support
Butterfly Valve
Ball Valve
Globe Valve
Gate Valve
1.5
2.0
2.5
2.7
4.0
5.0
# of Components
x
x
x
x
x
x
Total Additional Cable
=
=
=
=
=
=
If spiral wrapping or multiple runs of cable are being used, adjust the allowance by multiplying by the wrapping factor
or the number of runs being used on the pipe.
Guidelines for tracing tanks and vessels are also given in the Chromalox Design Guide (PJ304).
4. Determine Circuits/Circuit Protection
Circuit protection depends on the breaker size being used and the start-up temperature. The National Electric Code
(NEC 1999) requires the use of ground fault protection breakers for heating cable. The following chart shows the
maximum circuit length for a given breaker rating. To determine the number of circuits required for each pipe, divide
the total cable (circuit) length found in Step 3 by the maximum circuit length found in the chart. Round up to the next
higher number.
Number of Circuits
=
Heater Length
Maximum Circuit Length
Maximum Circuit Length (Ft.) by Start-up Temperature (°F) and Breaker Size (Amps)
Cable
Rating
50°F Start-Up (Ft.)
0°F Start-Up (Ft.)
-20°F Start-Up (Ft.)
Circuit
Breaker 10 A 15 A 20 A 25 A 30 A 40 A
Circuit
Breaker 10 A 15 A 20 A 25 A 30 A 40 A
Circuit
Breaker 10 A 15 A 20 A 25 A 30 A 40 A
SRL3-1C
SRL3-2C
205
400
305
600
360
660
NR
NR
NR
NR
NR
NR
135
275
200
415
270
555
330
660
360
NR
NR
NR
120
245
185
370
245
495
300
600
360
660
NR
NR
SRL5-1C
SRL5-2C
125
250
185
375
250
505
270
540
NR
NR
NR
NR
90
180
135
270
180
360
225
450
270
540
NR
NR
80
160
120
245
160
325
205
405
245
490
270
540
SRL8-1C
SRL8-2C
100
185
150
285
200
375
215
420
NR
NR
NR
NR
70
135
110
200
145
265
180
335
215
395
NR
420
65
120
100
175
130
235
165
300
200
350
210
420
SRL10-1C
SRL10-2C
60
100
95
160
130
210
160
260
180
315
NR
360
50
80
80
125
105
170
130
210
155
255
180
340
45
75
70
120
95
160
120
195
140
240
180
320
*Thermal magnetic circuit breakers are recommended since magnetic circuit breakers could “nuisance trip” at low temperature.
NR = Not Required. Maximum circuit length has been reached in a smaller breaker size.
4
Chromalox
®®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 1-800-443-2640 • FX: 615-793-3563 • www.chromalox.com
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
Self-Regulating Low Temperature Heating Cable – SRL
Specifications
Cable Ratings
Output @ 50°F
(W/Ft.)
Nominal
Voltage
(Vac)
Maximum Circuit Length*
(Ft.)
SRL3-1C
SRL3-2C
3
3
120
208-277
360
660
SRL5-1C
SRL5-2C
5
5
120
208-277
270
540
SRL8-1C
SRL8-2C
8
8
120
208-277
215
420
SRL10-1C
SRL10-2C
10
10
120
208-277
180
360
Model Number
*See chart on page 4 for maximum circuit lengths by start-up temperature and circuit breaker size
Output Wattage at Alternate Voltages (50°F) W/Ft.
Cable Rating
208 Volts
% Change
In Output
220 Volts
% Change
In Output
277 Volts
% Change
In Output
2.4
4.1
6.88
8.7
-20
-18
-14
-13
2.6
4.5
7.28
9.2
-13
-10
-9
-8
3.4
5.6
8.96
11.1
+15
+13
+12
+10
SRL3
SRL5
SRL8
SRL10
Ordering Information
Output
(W/Ft.)
Voltage
(Vac)
Model
Number
PCN
3
120
SRL3 - 1C
SRL3 - 1CR
SRL3 - 1CT
382678
382731
383400
208-277
SRL3 - 2C
SRL3 - 2CR
SRL3 - 2CT
382686
382740
383419
120
SRL5 - 1C
SRL5 - 1CR
SRL5 - 1CT
382694
382758
383443
208-277
SRL5 - 2C
SRL5 - 2CR
SRL5 - 2CT
382707
382766
383451
5
Output
(W/Ft.)
Voltage
(Vac)
Model
Number
PCN
8
120
SRL8 - 1C
SRL8 - 1CR
SRL8 - 1CT
382555
382598
383460
208-277
SRL8 - 2C
SRL8 - 2CR
SRL8 - 2CT
382563
382600
383478
120
SRL10 - 1C
SRL10 - 1CR
SRL10 - 1CT
382820
382846
383486
208-277
SRL10 - 2C
SRL10 - 2CR
SRL10 - 2CT
382838
382854
383494
10
To Order: Specify length, Model Number, PCN and Installation Accessories.
Chromalox
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 1-800-443-2640 • FX: 615-793-3563 • www.chromalox.com
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
5
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
SRL — Self-Regulating Low Temperature Heating Cable
Model Numbers
SRL
5
-
1
C
T
Overcoat Options
T = Fluoropolymer corrosion resistant
overjacket over braid for hostile/
corrosive environments
R = TPR overjacket over braid for
protection against certain inorganic
chemical solutions
Braid
C = Standard tinned-copper metallic braid for ground path
Voltage
1 = 120 Volts
2 = 208-277 Volts
Output (watts)
3, 5, 8, 10 Watts per Foot
SRL
Self-Regulating, Low Temperature Heating Cable
Accessories
Chromalox has a complete line of accessories specifically designed for use with SRL cable. Use only Chromalox
accessories to ensure the performance of the heat trace system.
Thermostat
Model
Description
RTAS
DL Series air-sensing thermostat with Microswitch®
for local control of circuit.
DL Series pipewall-sensing thermostat with Microswitch®
for local control of circuit.
DL Series power connection set kit.
DL Series splice and tee set kit.
DL Series end seal kit.
RTBC
Power Connection
RTPC
RTST
RTES
Pipe Straps
PS-1, PS-3, PS-10
Pipe straps to affix thermostat and power connection splice kits to
pipes.
Fiberglass Tape
FT-2
Tape to affix cable to pipe, 66' x 1/2" roll, install on 12" centers.
Aluminum Tape
AT-1
Tape to aid heat transfer, 180 foot roll.
Apply over cable along entire length of circuit.
Caution Labels
CL-1
“Electrical Heat Tracing” caution labels, 5 per package.
Install every 10 feet.
Control Panels
Contact your Chromalox representative for Control Panel information.
Note - For PCN's, refer to the DL Series connection system accessories product data sheet.
6
Chromalox
PJ320-2
PDS SRL
APRIL 04
®®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 1-800-443-2640 • FX: 615-793-3563 • www.chromalox.com
Heat Tracing Sales Mt. Airy, Maryland www.heattracingsales.com
410-795-2223
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