Raychem RTB Tubing Bundles Installation Manual
Reklama
Reklama
RTB Tubing Bundles Installation
Guide
Heating Solutions for Instrument and Small-Diameter
Process Lines
2 | nVent.com
WARNING:
Fire and shock hazard.
nVent RAYCHEM heat-tracing systems must be installed correctly to ensure proper operation and to prevent shock and fire. Read these important warnings and carefully follow all the installation instructions.
• To minimize the danger of fire from sustained electrical arcing if the heating cable is damaged or improperly installed, and to comply with nVent requirements, agency certifications, and the national electrical codes, ground-fault equipment protection must be used on each heatingcable branch circuit. Arcing may not be stopped by conventional circuit breakers.
• Approvals and performance of the heat-tracing systems are based on the use of nVent specified parts only. Do not substitute parts or use vinyl electrical tape.
• Bus wires will short if they contact each other. Keep bus wires separated.
• Components and cable ends must be kept dry before and during installation.
• The black heating-cable core and fibers are conductive and can short. They must be properly insulated and kept dry.
• Damaged bus wires can overheat or short. Do not break bus wire strands when preparing the cable for connection.
• Damaged heating cable can cause electrical arcing or fire. Do not use metal attachments such as pipe straps or tie wire. Use only nVent-approved tapes and cable ties to secure the cable to the pipe.
• Do not attempt to repair or energize damaged cable. Remove damaged cable at once and replace with a new length using the appropriate nVent splice kit. Replace damaged components.
• Re-use of the grommets, or use of the wrong grommet, can cause leaks, cracked components, shock, or fire. Be sure the type of grommet is correct for the heating cable being installed. Use a new grommet whenever the cable has been pulled out of the component.
• Use only fire-resistant insulation which is compatible with the application and the maximum exposure temperature of the system to be traced.
• To prevent fire or explosion in hazardous locations, verify that the maximum sheath temperature of the heating cable is below the auto-ignition temperature of the gases in the area. For further information, see the design documentation.
• Material Safety Data Sheets (MSDSs) are available from the nVent Customer Service Center, and at nVent.com.
CONTENTS
1. General Information ................................................................................................................................... 4
1.1 Use of the Manual ............................................................................................................................. 4
1.2 Safety Guidelines .............................................................................................................................. 4
1.3 Electrical Codes ................................................................................................................................ 4
1.4 Warranty and Approvals ................................................................................................................... 4
2. Introduction ................................................................................................................................................ 5
2.1 Product Line ...................................................................................................................................... 5
2.2 System Overview .............................................................................................................................. 6
2.3 Tubing Bundle Catalog Number ....................................................................................................... 7
2.4 Bundle Materials ............................................................................................................................... 7
3. Verify Product Selection ............................................................................................................................. 8
3.1 Heater Type and Temperature Range .............................................................................................. 8
3.2 Electrical Sizing and Run Length ..................................................................................................... 9
3.3 Select Components ........................................................................................................................ 11
3.4 Select Bundle Accessories............................................................................................................. 11
4. Installation ............................................................................................................................................... 13
4.1 Description ...................................................................................................................................... 13
4.2 Weights and Dimensions ............................................................................................................... 13
4.3 Storage ............................................................................................................................................ 14
4.4 Positioning and Support ................................................................................................................. 14
4.5 Uncoiling and Bending.................................................................................................................... 15
4.6 Electric Trace-Heating Connections .............................................................................................. 15
4.7 Bundle Sealing ................................................................................................................................ 17
4.9 Thermostat Jacket Patch ............................................................................................................... 18 nVent.com | 3
1. GENERAL INFORMATION
1.1 USE OF THE MANUAL
This installation and maintenance manual is for nVent RAYCHEM RTB Tubing Bundles systems only.
For information regarding other applications, design assistance or technical support, contact your nVent representative or nVent directly.
nVent
899 Broadway Street
Redwood City, CA 94063
USA
Tel (800) 545-6258
Fax (800) 527-5703
nVent.com
Important: For the nVent warranty and agency approvals to apply, the instructions that are
included in this manual and product packages must be followed.
1.2 SAFETY GUIDELINES
The safety and reliability of any heat-tracing system depends on proper design, installation and maintenance. Incorrect handling, installation, or maintenance of any of the system components can cause underheating or overheating of the pipe or damage to the heating-cable system and may result in system failure, electric shock or fire.
1.3 ELECTRICAL CODES
Sections 427 (pipelines and vessels) and 500 (classified locations) of the National Electrical
Code (NEC), and Part 1 of the Canadian Electrical Code, Sections 18 (hazardous locations) and
62 (Fixed Electric Space and Surface Heating), govern the installation of electrical heat-tracing systems. All heat-tracing-system installations must be in compliance with these and any other applicable national or local codes.
1.4 WARRANTY AND APPROVALS
The RTB system uses nVent RAYCHEM BTV and XTV heating cables that are approved and certified for use in nonhazardous and hazardous locations by many agencies, including FM
Approvals, CSA International, PTB, Baseefa (2001) Ltd., DNV, and ABS. For more details, consult the heating cable data sheets included in the Industrial Heating Product and Design Guide
(H56550) and the Technical Databook for Industrial Heat-Tracing Systems (DOC-389). Data sheets can be found on the nVent web site, nVent.com.
IMPORTANT WARNINGS AND NOTES
The following icons are used extensively throughout this manual to alert you to important warnings that affect safety and to important notes that affect the proper operation of the unit. Be sure to read and follow them carefully.
4 | nVent.com
2. INTRODUCTION
2.1 PRODUCT LINE
nVent provides a total solution for heat tracing instrument and small-diameter process lines.
RAYCHEM tubing bundles (RTB) are a pretraced and preinsulated tubing alternative to field tracing and insulating. RTB systems combine RAYCHEM electric or steam heat tracing with tubing and insulation for a single bundle that can be cut to length in the field.
Typical RTB applications include:
• Impulse lines - to flow transmitters, pressure transmitters, level transmitters, and pressure switches
• Sample lines - to analyzers and chromatographs
• Process lines - for steam supply, condensate return, water purge, chemical feed, and air lines
For European systems, the following nVent literature should be reviewed in order to complete the design and installation of RTB Tubing Bundles systems:
• Installation and Maintenance Manual (DOC-071)
• Components Selection Guide (DOC-565-R1)
• Electrical Protection Bulletin (DOC-057)
• Technical Data Book for Industrial Heat-Tracing Systems (DOC-389-R10)
For North American systems, the following nVent literature should be reviewed in order to complete the design and installation of RTB Tubing Bundles systems:
• Installation and Maintenance Guide (H57274)
• Design Guide for Insulated Pipes and Tubing (H56882)
This literature is available from your nVent representative.
Tubing bundles
RTB tubing bundles are available in a wide range of tubing and heater options (see bundle ordering options on page 7).
Trace-heating components
RTB tubing bundles use the full range of XTV and BTV power connection and end seal kits.
Bundle accessories
RTB bundle accessories include heat-shrinkable boots for sealing bundle ends, heat-shrinkable cable entry seals, a jacket patch kit for sealing around thermostat sensor entries, and a hightemperature silicone sealant for sealing bundle ends.
nVent.com | 5
2.2 SYSTEM OVERVIEW
An RTB system consists of pretraced and preinsulated tubing bundles. Each tubing bundle can be configured as single- or dual-tube, as shown below, and can be constructed in various sizes and materials to meet your small-diameter process piping needs.
Rugged outer jacket
Heating cable
Single-tube
Dual-tube
Nonhygroscopic fibrous insulation
Figure 1 Tubing bundles, single and dual-tube construction
RAYCHEM tubing bundles (RTB) are pre-engineered to ensure consistent and repeatable performance for maintenance-free operation. Compared to field fabrication, they simplify design and significantly reduce installation time. Each bundle can be cut to length in the field and is powered and terminated with simple RTB connection kits. The insulating material consists of a nonhygroscopic fibrous glass for maximum heat-loss prevention. Finally, each RTB is encased in a high-performance polyurethane outer jacket that provides superior UV resistance and installation capability to -40°C (-40°F).
Contact your nVent representative for design assistance for the following applications:
• The desired maintain temperature range or process tube size does not appear in Table 1 on page 8, Table 2 on page 9, or Table 3 on page 10
• The ambient temperature range is not between -30°C to 38°C (-20°F to 100°F)
• Supply voltages of 208 Vac and 277 Vac are used
6 | nVent.com
2.3 TUBING BUNDLE CATALOG NUMBER
RTB comes in a variety of configurations. The following chart outlines the elements that constitute a bundle configuration and the corresponding catalog number. Other configurations are available on request.
RTB* - X - XXX - X - XXX - XXX-X**
Electric Traced heating options
5B1 = 5BTV1-CT
8B1 = 8BTV1-CT
10B1 = 10BTV1-CT
5B2 = 5BTV2-CT
8B2 = 8BTV2-CT
10B2 = 10BTV2-CT
5X1 = 5XTV1-CT-T3
10X1 = 10XTV1-CT-T3
15X1 = 15XTV1-CT-T2
20X1 = 20XTV1-CT-T2
5X2 = 5XTV2-CT-T3
10X2 = 10XTV2-CT-T3
15X2 = 15XTV2-CT-T3
20X2 = 20XTV2-CT-T2
Process tube wall thickness
030 = 0.030 in
032 = 0.032 in
035 = 0.035 in
049 = 0.049 in
062 = 0.062 in
065 = 0.065 in
Process tube material
S = Seamless 316 SS
W = Welded 316 SS
10 = 1.0 mm
15 = 1.5 mm
M = Monel
C = Copper
Steam Traced heating options
LTS = Low-temperature steam
HTS = High-temperature steam
P = PFA
Process tubing size
1/8 = 1/8 in
1/4 = 1/4 in
3/8 = 3/8 in
1/2 = 1/2 in
3/4 = 3/4 in
Number of process tubes
1 = Single-tube
2 = Dual-tube
6 = 6 mm
8 = 8 mm
10 = 10 mm
12 = 12 mm
Preinsulated Only
PIO = Preinsulate only
* For optional Arctic PVC jacket, add suffix "C" example RTBC
** Requires the selection of tubing size = XX, tubing material = X, and wall thickness = XXX for both LTS and HTS
Examples:
Electric Traced
Steam Traced
RTB-2-1/2-S-049-10X1
RTB-2-1/2-S-049-LTS-3/8-C-035
Preinsulated Only RTBC-1-1/2-S-049-PIO
2.4 BUNDLE MATERIALS
Bundle jacket
• Thermoplastic polyether urethane elastomer
• Halogen-free
• Abrasion resistant
• UV-resistant
• Low-temperature flexibility
• Optional artic PVC
Thermal insulation
• Fibrous glass
• Water-soluble chlorides less than 100 ppm
• Non-hygroscopic
Tubing
• Welded stainless steel tubing complies with ASTM A-269.
• Seamless stainless steel tubing complies with ASTM A-269 and A213-EAW.
• Metric tubing sizes provided with inspection certificate per EN10204.
nVent.com | 7
3. VERIFY PRODUCT SELECTION
3.1 HEATER TYPE AND TEMPERATURE RANGE
Table 1 shows the minimum and maximum temperatures that can be maintained by the process tube over an ambient temperature range of -30°C to 38°C (-20°F to 100°F).
• In Table 1, find the column for the desired process tube size. Within the column, find the heater(s) that maintains a minimum temperature at or above the desired maintain temperature.
• If more than one heating cable will maintain the temperature, choose the one with the lowest maximum temperature. Make sure that:
• The T-rating of the heating cable is adequate
• Only XTV is used if the maximum system exposure temperature is above 85°C (185°F)
• A thermostat will be used if the maximum temperature in the table is higher than desired set point
Table 1: Process Tube Maintain Temperatures (Minimum-Maximum) for Ambient Range of -30°C to
38°C (-20°F to 100°F ) at 120/240 V
Heater Type
6 mm or 1/4 in
°C (°F) °C
8 mm
(°F)
Tubing Size
3/8 in
°C (°F) °C
10 mm
(°F)
12 mm or 1/2 in
°C (°F)
Single-tube
5BTV1 and 2
8BTV1 and 2
5XTV1 and 2
10XTV1 and 2
15XTV1 and 2
20XTV1 and 2
Dual-tube
19–52 (66–126)
32–58 (90–136)
31–92 (87–197)
63–110 (145–231)
18–52 (64–125)
31–57 (88–135)
28–90 (82–194)
60–108 (139–226)
84–126* (184–250)* 81–123* (177–250)*
16–51 (61–124)
29–57 (85–134)
26–88 (78–190)
56–105 (133–222)
78–120 (172–248)
15–51 (60–123)
28–56 (83–134)
23–87 (74–189)
53–105 (128–220)
77–120 (170–247)
14–50 (58–122)
27–56 (81–133)
21–84 (70–184)
51–101 (123–214)
71–116 (161–240)
111–151* (232–250)* 107–148* (224–250)* 103–145* (217–250)* 102–144* (215–250)* 96–139* (204–250)*
5BTV1 and 2
8BTV1 and 2
5XTV1 and 2
10XTV1 and 2
18–52 (64–125)
32–58 (89–136)
29–91 (85–196)
61–109 (142–228)
16–51 (61–124)
30–57 (86–135)
25–88 (77–190)
56–105 (133–221)
14–50 (58–122)
28–56 (82–133)
22–85 (71–184)
52–102 (125–215)
13–49 (56–121)
26–56 (79–132)
19–84 (66–183)
48–101 (119–213)
12–49 (53–120)
24–55 (76–131)
16–80 (60–176)
44–96 (112–205)
15XTV1 and 2
20XTV1 and 2
83–124* (181–250)* 77–119 (171–247)
109–149* (228–250)* 102–144* (216–250)*
73–116 (162–241) 71–115 (160–240)
97–140* (206–250)* 95–139* (203–250)*
64–110 (148–230)
87–132* (189–250)*
The temperatures included in Table 1 are approximate. For critical applications contact your nVent representative.
* Requires overtemperature line-sensing thermostat to ensure operation below maximum continuous exposure temperature of the heating cable.
Contact your nVent representative for design assistance for the following applications:
• The desired maintain temperature range or process tube size does not appear in Table 1 on page 8, Table 2 on page 9, or Table 3 on page 10
• The ambient temperature range is not between -30°C to 38°C (-20°F to 100°F)
• Supply voltages of 208 Vac and 277 Vac are used
8 | nVent.com
3.2 ELECTRICAL SIZING AND RUN LENGTH
Tables 2 and 3 show the maximum bundle length that may be powered from different sized circuit breakers. Use Table 2 for European type circuit breakers. Use Table 3 for North American circuit breakers. Note that ground-fault equipment protection (residual current device) is required on each heating cable branch circuit. To reduce the risk of fire caused by damage or improper installation, circuit breakers with a 30-mA trip level must be used. Alternative designs providing comparable levels of ground-fault protection may also be acceptable. Contact your nVent representative for assistance if you need to size circuit breakers for use under different start-up conditions. For maximum protection, use the smallest circuit breaker consistent with the length of heating cable installed.
Table 2: Maximum Circuit Length vs. Circuit Breaker Rating: 120 Vac
Heating Cable
5XTV1-CT-T3
10XTV1-CT-T3
15XTV1-CT-T2
20XTV1-CT-T2
5BTV1-CT
8BTV1-CT
10BTV1-CT
Start-up temp.
°C °F
10
–18
–29
–40
10
–18
–29
–40
10
–18
–29
–40
10
–18
–29
–40
10
–18
–29
–40
10
–18
–29
–40
10
–18
–29
–40
50
50
0
–20
–40
0
–20
–40
50
0
–20
–40
50
0
–20
–40
50
0
–20
–40
50
0
–20
–40
50
0
–20
–40
m
73
64
61
59
44
40
38
37
20 A ft
240
210
200
195
100
90
85
80
6
70
65
145
130
125
120
50
44
61
40
20
82
58
30
27
26
24
2
21
20
35
32
49
34
29
26
65
270
190
165
145
200
130
115
105
160
110
95
85
* For these design conditions, use a smaller circuit breaker or alternate heating cable.
38
34
46
30
15
70
43
23
20
20
18
15
15
15
26
24
37
24
21
20
m
55
49
46
44
34
29
29
27
15 A ft
180
160
150
145
110
95
95
90
50
230
140
125
110
150
100
75
65
65
60
50
50
50
85
80
120
80
70
65
30 A ft
360
320
305
290
150
135
130
125
120
105
105
220
195
190
180
100
270
270
250
220
210
200
175
155
180
160
140
125
76
67
64
61
30
82
82
46
41
40
38
37
32
32
53
47
55
49
43
38
m
110
98
93
88
67
59
58
55
40 A ft
385
385
385
385
200
180
170
165
160
140
140
270
260
250
240
130
270
270
270
270
210
210
210
210
180
180
180
170
82
82
64
64
40
82
82
61
55
52
50
49
43
43
64
64
55
55
55
52
m
117
117
117
117
82
79
76
73
50 A ft
385
385
385
385
220
220
215
205
190
180
170
270
270
270
270
*
*
*
*
165
*
*
*
*
*
*
*
*
*
*
*
*
50
*
*
67
67
66
62
58
55
52
*
*
*
*
*
*
m
117
117
117
117
82
82
82
82 nVent.com | 9
Table 3: Maximum Circuit Length vs. Circuit Breaker Rating: 240 Vac
Heating Cable
5XTV2-CT-T3
10XTV2-CT-T3
15XTV2-CT-T3
20XTV2-CT-T2
5BTV2-CT
8BTV2-CT
10BTV2-CT
–29
–40
10
–18
–29
–29
–40
10
–18
–40
10
–18
–29
–40
10
–18
–29
–40
10
–18
–29
–40
–29
–40
10
–18
Start-up temp.
°C °F
10
–18
50
0
–20
–40
50
0
0
–20
–40
50
0
–20
–40
–20
–40
50
0
–20
–20
–40
50
0
–40
50
0
–20
–40
50
* For these design conditions, use a smaller circuit breaker or alternate heating cable.
38
37
35
30
30
56
53
46
40
29
140
87
76
67
91
61
53
47
73
49
44
38
m
110
96
90
87
67
59
15 A ft
360
315
295
285
220
195
125
120
115
100
100
185
175
150
130
95
460
285
250
220
300
200
175
155
240
160
145
125
50
49
46
41
40
75
72
61
53
38
165
116
101
90
122
81
72
64
96
66
58
52
m
146
128
120
116
90
79
20 A ft
480
420
395
380
295
260
165
160
150
135
130
245
235
200
175
125
540
380
330
295
400
265
235
210
315
215
190
170
250
240
230
205
200
370
355
300
265
190
540
540
500
440
420
400
350
315
360
325
285
255
30 A ft
720
625
595
570
440
385
76
73
70
62
61
113
108
91
81
58
165
165
152
134
128
122
107
96
110
99
87
78
m
219
191
181
174
134
117
420
405
380
345
330
540
540
445
440
320
*
*
*
*
*
*
*
*
*
*
*
*
50 A ft
765
765
765
765
540
540
128
123
116
105
101
165
165
136
134
*
*
*
*
*
98
*
*
*
*
*
*
*
m
233
233
233
233
165
165
335
320
530
275
265
495
470
400
355
255
540
540
540
540
420
420
420
420
360
360
360
340
40 A ft
765
765
765
760
540
515
102
98
162
84
81
151
143
122
108
78
165
165
165
165
128
128
128
128
360
110
110
104
m
233
233
233
232
165
157
10 | nVent.com
3.3 SELECT COMPONENTS
The heating cable on RTB Tubing Bundles must be connected with power connection and end seal kits specifically approved for use with BTV and XTV heating cable. Typical North American and European component systems are shown below. Consult the appropriate guide for specific component selection information.
• Use RTB Design Guide (H56886) for North American components selection
• Use Components Selection Guide (Doc-565-R1) for European components selection
Mounting bracket
Junction box
Connection kit
End seal
Connection kit
Junction box
End seal
Instrument enclosure or insulation package
Thermal insulation and cladding, or insulation package
Figure 2 Typical North American power connection and end seal
Instrument enclosure or insulation package
Thermal insulation and cladding, or insulation package
Figure 3 Typical North American power connection and end seal
3.4 SELECT BUNDLE ACCESSORIES
RTBK-B2A
RTBK-B3A
Heat-shrinkable boots (RTBK-B) are used for sealing bundle ends. The boots are designed to
provide a weatherproof seal at the end of the tubing bundles. These boots may be used on all electric-traced bundles. For steam-traced bundles, use silicone sealant (TPK-SK-10).
Use RTBK-B1A for preinsulate only
Use RTBK-B2A for single tube bundles
Use RTBK-B3A for dual tube bundles
RTBK-CES
Important: Although RTB tubing bundles use a non-hygroscopic thermal insulation, all bundle ends
and jacket penetrations must be sealed to keep the insulation from getting wet. Wet insulation will not maintain the designed pipe temperature.
Heat-shrinkable entry seals (RTBK-CES) may be used to provide a waterproof fitting where the
bundle enters an enclosure or penetrates a bulkhead. Use the table below to select the appropriate entry seal for your tubing size. The thermally stabilized modified polyolefin entry seal includes an
O-ring assembly that seals at the enclosure, and a heat-shrinkable nose that seals to the bundle.
Single-tube
Tubing
1/4–3/8" (6–10 mm)
1/2" (12 mm)
RTBK-CES4
RTBK-CES4
RTBK-CES4
RTBK-CES5 nVent.com | 11
12 | nVent.com
Jacket patch kits (RTB-TPKJP-1) must be used for sealing around line-sensing thermostat entries.
The kit contains thermal insulation, fiberglass tape to hold the insulation in place, and a black, selfsealing rubber patch for weatherproofing the bundle.
TPKJP-1
Silicone sealant (RTB-TPKSK-10) is a black silicone RTV sealant used for sealing the ends of the
tubing bundle from moisture. Cure time is approximately 24 hours at 25°C (77°F). The 280 gm
(10 ounce) tube will seal approximately 10 bundle ends. Silicone sealant can be used for either electric- or steam-traced bundles.
TPKSK-10
4. INSTALLATION
4.1 DESCRIPTION
RTB tubing bundles are designed to be used as heated instrument lines or small-diameter process lines. The bundles are designed for single-use, fixed installation applications.
The minimum installation temperature for RTB Tubing Bundles is –40°C (–40°F).
Do not use RTB tubing bundles in the following applications:
Applications that flex in normal use.
Applications where the bundle is moved and re-used.
Electrically heated RTB tubing bundles must be installed with power connection and end seal kits specifically approved for use with BTV and XTV heating cable.
All bundle ends must be temporarily sealed from moisture ingress during installation. Tape a plastic bag in place to seal the end of the bundle.
4.2 WEIGHTS AND DIMENSIONS
The following tables show nominal weights and outside dimensions for a variety of bundle configurations.
Table 4: Electric bundle weights and dimensions
Nominal weight
Single 1/4
" process tube
Single 3/8
" process tube
Single 1/2
" process tube
Dual 1/4
" process tubes
Dual 3/8
" process tubes
Dual 1/2
" process tubes
kg/m
0.45
0.60
0.74
0.60
0.89
1.19
(lb/ft)
(0.3)
(0.4)
(0.5)
(0.4)
(0.6)
(0.8)
Minimum bending radius 20 cm (8 in)
Maximum support centers-ft. Horizontal 2 m (6.5 ft) Vertical 4 m (13 ft)
3.3
3.8
4.3
cm
2.8
3.3
3.6
Nominal dimensions
A
(in)
(1.1)
cm
2.5
B
(1.3)
(1.4)
(1.3)
(1.5)
(1.7)
2.5
2.8
2.8
3.0
3.6
(in)
(1.0)
(1.0)
(1.1)
(1.1)
(1.2)
(1.4)
A
Single
B
A
Dual
B
Table 5: Steam bundle weights and dimensions
Nominal weight
LTS - One 3/8" Process with 3/8" Tracer
LTS - One 1/2" Process with 3/8" Trace
LTS - One 1/2" Process with 1/2" Tracer
LTS - Two 3/8" Process with 3/8" Tracer
LTS - Two 1/2" Process with 3/8" Tracer
LTS - Two 1/2" Process with 1/2" Tracer
HTS - One 3/8" Process with 3/8" Tracer
HTS - One 1/2" Process with 3/8" Tracer
HTS - One 1/2" Process with 1/2" Tracer
HTS - Two 3/8" Process with 3/8" Tracer
HTS - Two 1/2" Process with 1/2" Tracer
Minimum bending radius 20 cm (8 in)
Maximum support centers-ft. Horizontal 1.8 m (6 ft) Vertical 4.6 m (15 ft)
kg/m (lb/ft)
0.5 (0.74)
0.6 (0.89)
0.7 (1.04)
0.6 (0.89)
0.8 (1.19)
0.9 (1.34)
0.5 (0.74)
0.6 (0.89)
0.7 (1.04)
0.6 (0.89)
0.8 (1.19)
Nominal dimensions
A B cm (in) cm (in)
4.1 (1.6)
4.8 (1.9)
2.8 (1.1)
3.0 (1.2)
4.8 (1.9)
5.8 (2.3)
3.0 (1.2)
3.0 (1.2)
6.6 (2.6)
6.6 (2.6)
3.8 (1.5)
4.1 (1.6)
4.3 (1.7)
5.1 (2.0)
5.6 (2.2)
3.3 (1.3)
3.3 (1.3)
3.0 (1.2)
3.0 (1.2)
3.0 (1.2)
3.0 (1.2)
3.0 (1.2)
A
LTS Single Process
A
B
B
HTS Single Process
A
LTS Dual Process
A
HTS Dual Process
B
B
nVent.com | 13
Table 6: Preinsulated tubing bundle weights and dimensions
Minimum bend radius Support centers m (ft)
Nominal weight
Nominal dimensions “A” cm (in) Horizontal Vertical kg/m (lb/ft) cm (in)
One 1/4" process lin 20 (8)
One 3/8" process lin 20 (8)
One 1/2" process lin 20 (8)
1.8 (6)
1.8 (6)
1.8 (6)
4.6 (15)
4.6 (15)
4.6 (15)
0.30 (0.2)
0.45 (0.3)
0.60 (0.4)
2.5 (1.0)
3.2 (1.2)
3.4 (1.3)
A
4.3 STORAGE
When storing the bundle, take the following precautions:
• All bundle ends must be sealed at all times to prevent moisture ingress.
• Protect the bundle from the weather.
• Protect the bundle from mechanical damage.
• Store at temperatures between –40°C (–40°F) and 60°C (140°F).
4.4 POSITIONING AND SUPPORT
Positioning
Follow these six guidelines to position the tubing bundle:
• Position along existing structures, such as beams and columns, for support.
• Avoid areas where the ambient temperature may exceed 38°C (100°F).
• Maintain a 12-mm (1/2-in) clearance between bundles.
• Allow 300–450 mm (12–18 in) of straight tubing bundle before connecting to fittings.
• Add enough length to the bundle to connect to the heating cable power supply. (See Section
3.6). Include the length from the process connection location to the power junction box plus
150 mm (6 in) inside the junction box.
Minimum bending diameter: 400 mm (16 in)
Maximum support centers: Horizontal = 2 m (6 ft), Vertical = 4 m (12 ft)
Supports
Supports and hangers must have a large surface area (Fig A) and be designed so they cannot be overtightened and crush the tubing bundle. Do not use u-bolts as supports.
An angle iron may be used as a support (Fig. B). Place the bundle in an angle sized 12 mm (1/2 in) larger than the largest dimension of the bundle. Secure the bundle with metal or plastic straps. Do not use wire ties.
Cable trays may also be used as supports. Maintain a minimum of 12 mm (1/2 in) between bundles.
Fig. A Fig. B
14 | nVent.com
4.5 UNCOILING AND BENDING
Method 1: Roll the bundle off the shipping reel onto the floor or other flat surface. This will leave a slight bow that can be taken out by hand.
Method 2: Use a second smaller spool to straighten the product as it is taken off the larger shipping spool.
)
400 mm(16 in min.
Do not bend tighter than the minimum bending diameter of 400 mm (16 in)
• The bundle jacket will wrinkle when the bundle is bent. This is a normal condition, and does not affect the performance or life of the bundle.
• When bending the bundle, use a mandrel that is at least as big as the minimum bending radius, such as a small spool or a pipe bender shoe.
• For dual-tube bundles, bend on the small dimension; the bundle will tend to twist and then bend on this dimension naturally.
• To bend on the larger dimension, grasp the bundle firmly and twist it 90 degrees. Then make the bend. This technique may also be used to position the tubing for process connections.
4.6 ELECTRIC TRACE-HEATING CONNECTIONS
Figures 4-7 show typical tubing bundle power connection and end seal installations. The tubing bundle heating cables are shown powered from a separate power feed, and from a tee connection.
Figure 4 - Power connection and end termination (Europe)
Figure 5 - Heating cable powered from a tee connection (Europe)
Figure 6 - Power connection and end termination (North America)
Figure 7 - Heating cable powered from a tee connection (North America)
Important Installation Notes:
• Electrically heated RTB Tubing Bundles must be installed with power connection and end seal kits specifically approved for use with BTV and XTV heating cable.
• Make sure that all pipes and tubes are thermally insulated.
• Do not power the tubing bundle heating cable from a tee connection if a line sensing thermostat is used on the main line, as flow in the main line will shut down the tubing bundle heating cable. nVent.com | 15
Thermal insulation
Thermal insulation
Instrument enclosure or insulation package
Figure 4 Typical power connection and end termination (Europe)
Instrument enclosure or insulation package
Figure 5 Typical heating cable powered from a tee connection
(Europe)
Thermal insulation
Thermal insulation
Instrument enclosure or insulation package
Figure 6 Typical power connection and end termination (North
America)
Instrument enclosure or insulation package
Figure 7 Typical heating cable powered from a tee connection
(North America)
IMPORTANT: Do not power the bundle heating cable from a tee connection if a line sensing
thermostat is used on the main line.
16 | nVent.com
4.7 BUNDLE SEALING
Heat-shrinkable Boot Installation
• Cut back the bundle, leaving the desired length of tubing and cable exposed.
• Use a tubing bender to bend the process tube(s) to the correct instrumentation centers before installing the boot. This will result in a more compact installation.
• Slip the boot over the end of the bundle with one tube or cable in each leg until the bundle seats at the bottom of the boot.
• Use a heat gun to shrink the boot over the bundle, tube(s) and heating cable. Applying heat evenly, move the heat source back and forth over the boot. Once the boot has assumed the shape of the bundle and tubes and an adhesive bead is visible, stop applying heat; further heating will not make the boot shrink more tightly.
RTV Sealant
• To seal the bundle with RTV sealant, cut the thermal insulation back under the jacket about 10 mm (3/8 in). It is important to cut the insulation out rather than push it back. Fill the end with sealant, making sure that all exposed insulation is protected.
10 mm (3/8")
4.8 BUNDLE SEALING
• Place the rigid, externally threaded nut through the enclosure hole so that the flanged end is on the inside of the enclosure.
• Place the O-ring over the threaded end position against the outside of the enclosure.
• Using appropriate spanner wrenches, screw the shrinkable internally threaded nose on to the rigid nut and tighten.
• Shrink the expanded nose by applying heat with a heat gun. Applying the heat evenly, move the heat source back and forth over the nose. Once the boot has assumed the shape of the bundle and the tubes and an adhesive bead is visible, stop applying heat; further heating will not make the nose shrink more tightly. nVent.com | 17
Model number
RTB-CES4
RTB-CES5
Panel (A) maximum thickness
10 mm
(0.38 in)
20 mm
(0.75 in)
Nose I.D. minimum expanded
I.D.
40 mm
(1.60 in)
70 mm
(2.75 in)
Maximum recovered
I.D.
20 mm
(0.75 in)
35 mm
(1.43 in)
Mounting hole diameter
50 mm
(2.00 in)
75 mm
(3.00 in)
A
Outsid e enclosur e
Inside enclosur e
Nut O-ring
4.9 THERMOSTAT JACKET PATCH
• Locate a suitable mounting location for the thermostat housing. Route the capillary along the bundle, away from heat sources other than the heating cable in the bundle.
Heating cable
Slit
• Locate the heating cable in the bundle. The heating cable can usually be felt through the bundle and thermal insulation. Make a slit lengthwise along the bundle opposite the heating cable, where the capillary bulb will be placed. The slit should be about 50 mm (2 in) longer than the length of the bulb. The slit must go through the thermal insulation and Mylar film.
• Insert the bulb into the bundle in direct contact with the tube. Cut the 50-mm-wide (2-in-wide) thermal insulation into three pieces, each about 25 mm (1 in) shorter than the length of the slit.
For each piece, fold the tape along the cut length to make a double layer 25 mm (1 in) wide.
Work each of the three pieces into the slit, positioning them on top of the capillary bulb, and under the outer jacket.
Slit
Bulb
Capillary
Heating cable
Bulb
Insulation
18 | nVent.com
• Use the fiberglass tape to wrap the bundle at the slit area. Space the tape wrap every 40 mm
(1.5 in). Secure the capillary to the bundle with the tape, for a distance of at least 50 mm (2 in) from the end of the slit. Apply a liberal bead of silicone sealant along each side of the capillary.
4 cm (1.5")
• Use the black rubber patch supplied with the jacket patch kit to wrap the bundle at the slit. Cut the patch so that it extends 50 mm (2 in) past the slit in both directions. Remove the protective backing and wrap the patch around the slit area, overlapping the edge. Press into place.
• Use a heat gun to shrink the boot over the bundle tubes and TRACER. Applying heat evenly, move the heat source back and forth over the boot. Once the boot has assumed the shape of the bundle and tubes, stop applying heat; further heating will not make the boot shrink more tightly. Cut the tubing and cable to the length required for instrument and cable connections.
nVent.com | 19
North America
Tel: +1.800.545.6258
Fax: +1.800.527.5703
Europe, Middle East, Africa
Tel: +32.16.213.511
Fax: +32.16.213.604
Asia Pacific
Tel: +86.21.2412.1688
Fax: +86.21.5426.3167
Latin America
Tel: +1.713.868.4800
Fax: +1.713.868.2333
©2018 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without notice.
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