Specification For Pipe Heaters: 0 14.07.2015 First Issue NV US SVK
Specification For Pipe Heaters: 0 14.07.2015 First Issue NV US SVK
Specification For Pipe Heaters: 0 14.07.2015 First Issue NV US SVK
TABLE OF CONTENTS
Page 2 of 47
Title: Specification for Steam Tracing
1.8 SCOPE.......................................................................................................................................................3
1.9 UNIONS....................................................................................................................................................3
1.10 HEAT SENSITIVE LINES..............................................................................................................................4
1.14 IDENTIFICATION TAG................................................................................................................................4
2 4
2.2 CONDENSATE TRAP STATION...................................................................................................................5
3.2 TRACER SECUREMENT..............................................................................................................................5
3.3 PRESSURE TESTING...................................................................................................................................5
4 TRACING REQUIREMENTS FOR LINES - USING HEAT TRANSFER CEMENT...................................................5
4.1 THERMON................................................................................................................................................5
4.2 METHOD AND INSTALLATION..................................................................................................................5
4.3 PRESSURE TESTING...................................................................................................................................5
4.4 SNAP TRACE - USE FOR 204°C AND BELOW..............................................................................................5
4.5 CHANNEL TRACE - USE ABOVE 204°C.......................................................................................................6
4.6 IRREGULAR SURAFCES..............................................................................................................................6
4.7 CURING AND WEATHER PROOFING.........................................................................................................6
4.7 MATERIALS...............................................................................................................................................6
5 EQUIPMENT TRACING REQUIREMENTS......................................................................................................7
5.1 GENERAL..................................................................................................................................................7
5.2 MAXIMUM LENGTH OF TRACERS.............................................................................................................7
5.3 HEAT TRANSFER CEMENT.........................................................................................................................7
6 INSTRUMENT STEAM TRACING...................................................................................................................7
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Title: Specification for Steam Tracing
1.8 SCOPE
Bending of tubing shall be done with a tube bender. Forming by hand-bending shall be kept to a minimum.
1.8.1 The pre-insulated tubing in most cases can be installed by hand with bends over a simple mandrel.
1.8.2 There are rare cases where very tight bends, less than the recommended radius, must be made.
This requires stripping the jacket to bare metal - see Figure 5 for details. It is imperative that the exposed
ends of the insulation be covered with sealant to prevent deterioration of the insulation and in some case,
it will cause damage to the tubing if the material is susceptible to corrosion.
1.9 UNIONS
Tubing unions shall be installed in tracers where necessary to permit removal of items that require
maintenance such as pumps, relief valves, instruments, control valves, strainer baskets, and the like.
Unions in tracers shall be located outside of the pipe insulation.
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Title: Specification for Steam Tracing
1.10 HEAT SENSITIVE LINES
When heat sensitive or corrosive fluids such as caustic, certain acids and glycerin are being carried, care
must be taken to prevent the tracer prom coming into direct contact with the product line. Apply 1” wide
insulating tape between the tracers and pipe to maintain ½” clearance.
TR – 113 - 3A
TR-113-3A
1/4-inch hole
2
drawing is made for each station. Stations are also assigned numbers and located on the plot plan, piping
drawings, or the model, indicating unit number, station number and whether they are supply or trap
stations. Supply stations are indicated with circles and trap stations with hexagons - Sample below.
Take-offs for tracers shall be from steam supply stations that are readily accessible from a platform or
grade. Each station supply sub header shall be supplied with a shut-off valve and each tracer must be
individually valve. See Figures 1 and 2.
Pre-insulated tubing, with factory applied insulation and polyvinal chloride jacket such as Dekoron 2200
series, or CXT & SSIT manufactured by TRW Crescent Wire and Cable, shall be used to carry steam from a
tracer supply station to the process line to be traced or steam condensate from a tracer to a condensate
trap station.
2.2.3 Stainless steel tubing and fittings shall be in accordance with Table V of this standard.
2.1.4 Insulation shall be designed for the operating temperature of the traced equipment or line.
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Title: Specification for Steam Tracing
2.2 CONDENSATE TRAP STATION
Steam traps shall be installed below and close to the equipment or pipe being drained. Tracer routing shall
be such that traps, and trap manifold locations will not interfere with operation and maintenance of
equipment or obstruct access ways.
A separate trap shall be installed for each tracer at its terminal. If a tracer exceeds the maximum
permissible trapping length, a new tracer from the steam supply header shall been installed for
continuing the tracing of the product line.
4.1 THERMON
This section is written around the trade name Thermon. Other brands may be offered as an alternative.
Themon Snap-Trace jacket shall be used for steam and process temperatures 204°C and under. For
temperatures 205°C and above, Thermon Channel Trace will be used. For valves and other irregular
surfaces, standard grade Thermon heat transfer cement shall be toweled on manually.
4.2.1. Tracers shall be in direct contact with the process line over their entire lengths.
4.2.2 Do not install expansion loops in tracers applied with heat transfer cement.
4.4.2 Snap Trace is permanently bonded to the process pipe by tightly strapping the TFK channel with
stainless steel bands. No curing procedures are necessary where used and that part of the installed system
can be put into service immediately. No weather proofing, except temporary protection from erosion of
rain or moisture is required.
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Title: Specification for Steam Tracing
4.5 CHANNEL TRACE - USE ABOVE 204°C
Installation methods are similar to Snap Trace. For application, the 4 foot stock length channel should be
filled with Thermon standard grade of heat transfer cement using an ordinary hand trowel. A V-shaped
striking tool is used to remove a small portion of cement from the channel, leaving a V-groove. The tool
should be dipped in water prior to striking, to prevent cement from sticking to the tool.
4.5.1 Install the channel over the tracer tube immediately after being filled with cement. Center the
channel over the tracer and press snugly against the pipe. Temporary tie-wires, which are holding the
tracer in place, shall be removed prior to applying the channel. Adjacent sections of channel shall be
butted together without overlapping. Secure channels with stainless steel bands spaced on 16-inch
centers, with one centered over each butt joint.
4.5.2 Where the tracer tube enters or leaves the channel, the steam and condensate terminal points
shall be secured to the traced pipe with two stainless steel bands. The bands shall be securely tightened to
prevent movement of the tubing.
4.5.3 The exposed portion of the bare tubing between the terminal points and the pre-insulated
jacketed tubing leads shall be wrapped with insulating tape. Apply a mastic coating over this tape with a
stiff brush. Do not cover the unions.
4.5.4 For elbows, use short channel sections and install as shown in Figure 15.
4.5.5 The manufacturers’ min. application temperature is 0°C for standard grade. Thermon heat transfer
cement. However, the cement should not be applied during weather colder than 4°C without taking extra
precautions such as preheating the cement, piping, vessels, equipment and the mechanical application
equipment.
4.7.1 On valves and other irregular shaped equipment where Thermon Standard T-3 and T-63 Grade is
installed in a large mass, the normal curing time is 4 to 12 hours at a temperature from 71°C to 100°C.
4.7.2 Thermon Standard T-3 and T-63 Grade heat transfer cement is water soluble and requires the
same moisture protection necessary for most insulation materials. The use of polyethylene film is
recommended for the purpose of shedding rain.
4.7 MATERIALS
The following are basic materials mentioned in this section.
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Title: Specification for Steam Tracing
Heat Transfer Cements
CHANNELS
BANDS
1/2- by .020-inch, Type 316 stainless steel, with matching seals for securing channel to pipe.
5.1 GENERAL
Equipments which require steam tracing-wire not normally provided with clips, studs, or other means of
attaching the tracer.
This section of the standard has been written around banding, wiring, and finger strapping. This does not
preclude welding of attachments on those pieces of equipment where field welding is permissible. Any
field welding for the purpose of attaching steam tracers must be reviewed and approved before
fabrication.
All enamel must be removed from the area to which heat transfer cement is to be applied. Residue must
be cleaned with solvent and rage. Dirt, loose scale, and rust must be removed by wire brush or
sandblasting.
6.2 At the instrument piping or enclosure, a transition to a steam traced bundle containing one or two
process tubes and a steam tube may be required as shown in Figure 24 through Figure 32, 36 and 37.
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Title: Specification for Steam Tracing
TABLE – I
HOLDING TEMPERATURES
TRACED
1"
1 1/2"
2"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
24"
30"
36"
42"
LINE SIZE
10°C 37°C 65°C 93°C 149°C
(INCHES)
* Size and number of tracers are shown in Table I. The equivalent length of various valves and
fittings in the tracing circuit must be subtracted from the trapping distance shown above from the
computerized results.
TABLE – III
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Title: Specification for Steam Tracing
TRACING STEAM SUPPLY STEAM HEADER
3 or less 1 inch
4 through 11 1 ½ inch
12 through 25 2 inch
TABLE – IV
4 or less 1 inch
5 through 12 1 ½ inch
13 through 25 2 inch
NOTES:
Run separate sub header. Do not take any individual tracers off the main stem line.
TABLE – V
Number and size of tubes - Inches (1) 3/8 (2) 3/8 (3) 3/8
5 Any ½ Gate valve, 800 pound forged steel, screwed/ socket weld ends
Pre-insulated tubing, one 1/2-inch OD x 0.035-inch wall, type 316 SMLS stainless
6 149°C -
steel tubes, nominal bundle OD 1 7/8 inches.
Pre-insulated tubing, two 1/2-inch OD x 0.035-inch wall, type 316 SMLS stainless
7 149°C -
steel tubes, nominal bundle OD 1 7/8 inches.
8 399°C ½ Tube and male pipe thread adapter, type 316 stainless steel
TABLE – VII
48 150 96 2 75
54 170 96 2 85
60 188 96 2 94
66 207 96 3 69
72 226 96 3 75
78 245 96 3 82
84 264 96 3 88
90 282 96 3 94
96 302 96 4 75
102 AND
- 144 4 VARIES
LARGER
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Title: Specification for Steam Tracing
FIGURE 5
Strip back length needed to make bend as shown in detail 'a'. Detail 'b' shows application of dekoron hi-
temp sealant to exposed ends of stripped dekoron. Allow sufficient for sealant to cure. Wrap 1/2- inch
thick by 1½ -inch wide insulating tape to the same thickness as the dekoron jacket – see detail 'c'. Apply
mastic with a stiff brush over the insulating tape. Extending about ½-inch past the seam – see detail’d’.
Childer’s mastic coating for brush or spray is cp-11-1 for a metallic-gray color and cp-11-2 for black. For a
neat appearance use a strip of making tape at each end when applying, strip off when finished
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