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Confidential: This document is confidential and must not be copied or reproduced except with the express
permission of Long Son Petrochemicals Co., Ltd.
PROJECT TECHNICAL SPECIFICATION
PIP 006
STEAM TRACING PIPING
0 15/09/2009 ISSUE FOR LSP PROJECT HHM PCS
REV. DATE DESCRIPTION PREPARED CHECKED APPROVED
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TABLE OF CONTENTS
1. GENERAL ...............................................................................................3
1.1. Scope...................................................................................................................... 3
1.2. Codes and Standards ............................................................................................. 3
1.3. Related Engineering Specifications ........................................................................ 3
1.4. Conflict .................................................................................................................... 3
2.
BASIC DESIGN.......................................................................................4
2.1. General ................................................................................................................... 4
2.2. Materials.................................................................................................................. 4
2.3. Tracer Manifolds and Tracer Manifold Supplies ..................................................... 8
2.4. Tracer...................................................................................................................... 8
2.5. Condensate Pipes................................................................................................. 10
2.6. Supports................................................................................................................ 10
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1. GENERAL
1.1. Scope
1.1.1. This specification contains requirements for the design and materials of steam tracing to be
provided for the equipment, piping, in-line instrument in Olefins Plant.
1.1.2. This specification covers all items requiring steam tracing, such as process and utility piping,
in-line instrument and equipment as shown on the P & I Flow diagram (hereinafter referred
to as P & I) and Utility Flow Diagram (hereinafter referred to as UFD). However, steams
tracing piping to be supplied with the manufacturers proprietary or standardized equipment are
excluded in general.
1.2. Codes and Standards
Design, fabrication, inspection and tests of steam tracing piping materials and its accessories,
unless otherwise specified in this specification, shall be in accordance with the applicable codes
and standards.
1.3. Related Engineering Specifications
The related Engineering Specifications to supplement this specification are as follows:
Project specification of Piping Design Basis
Project specification of Piping Material for Olefins Plant
Project specification of Thermal Insulation Design
1.4. Conflict
If any conflicts exist, Contractor shall seek clarification from Owner before proceeding.
Generally, the most stringent requirements shall apply.
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2. BASIC DESIGN
2.1. General
2.1.1. Steam tracing shall be provided on all lines, equipment, instruments, where, under expected
ambient temperature, freezing, solidification, rise in viscosity or separation of fluid or
condensation of water in corrosive gas etc., would cause trouble in normal operations and
shut- down unless they are externally heated.
2.1.2. All items requiring steam tracing, such as equipment, in-line instruments and piping shall be as
shown on the applicable P & I and UFD by symbol.
2.1.3. Insulation thickness shall be in accordance with the Thermal Insulation Design Specification
based on the operation temperature of the line to be traced.
2.1.4. Typical steam tracing piping system is as shown in Figure 1 of Attached figures.
2.2. Materials
2.2.1. Pipes, Valves and Fittings
In general specifications of piping materials for steam tracing shall be the same as those
applicable to the steam mains. However, the tracer (including tracer supply and return) may be
connected with butt-weld and the branch of manifold fabricated with nozzle weld. Stainless steel
tubes may be used in accordance with the requirements of this specification.
2.2.2. Traps for steam Tracing System
Traps shall be the thermostatic type with strainer.
2.2.3. Fastening Materials
Fastening materials for the tracers shall be as follows:
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MATERIAL DIMENSION
Galvanized anneal steel wires S.W.G. #18
Galvanized steel bands 0.4 mm x 13 mm
304 Stainless steel wires S.W.G #18
304 Stainless steel bands 0.4 mm x 13 mm
Note: Stainless steel wires and bands shall be used forstainless steel piping and equipment.
2.2.4. Stainless Steel Tube
Stainless steel tube size shall generally be the inside diameter of 8mm and the outside
diameter of 10mm.
Stainless tube shall be soft annealed seamless tube of equal or higher grade than 304SS
specified in ASTM, "Stainless Steel Pipes".
All tube fittings shall be of bite type.
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Figure 1 Steam Tracing Piping System
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Figure 2 Tracer Insulated with Spacer
Figure 3 Tracer Expansion Loop
(1) Horizontal line
(2) Vertical line
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Figure 4 Standard locations of Tracers
2.3. Tracer Manifolds and Tracer Manifold Supplies
2.3.1. Tracer manifold shall be provided only where there are a minimum 3 tracer supplies
grouped within a 3 m radius, and its size shall generally be 2". Tracer supply other than stated
above shall be directly branched from the steam mains.
2.3.2. Block valves for tracer manifold supplies shall generally be installed at vicinity and horizontal
of the branch part of the steam mains.
2.3.3. Tracer manifold supply shall be branched from the top of steam main, and tracer supplies
branched from t he top or hori zontal of trac er manifold.
2.4. Tracer
2.4.1. Size of tracer shall generally be of 1/2 (NPS). The tracer of size 3/4 (NPS) may be applied for
large diameter piping and/or long distance piping such as interconnecting piping. Tube of
outside diameter 10 mm and inside diameter 8 mm may be used for traced line size 4 (NPS)
and smaller, equipment having irregular surface and in-line instrument.
Note: When tube tracers of outside diameter 10 mm are applied, the tracer supplies and
tracer returns shall be 1/2 (NPS). When tracers of 3/4 (NPS) are applied, the block valves and
their up - stream in the tracer supplies, and the condensate traps and their down-stream in the
tracer returns shall be 1/2 (NPS).
2.4.2. The minimum number of parallel steam tracers for each tracer size shall be as shown in Attached
Table 1.
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2.4.3. The maximum allowable length of tracer (total length from tracer supplyline to condensate trap)by LS1 or MS2 are respectively as follows:
MAXIMUM ALLOWABLE LENGTH (M)TRACER SIZE
LS1 MS2
Tube 10/8 60 60
Pipe 1/2 (NPS) 60 100
Pipe 3/4 (NPS) 70 120
2.4.4. The pocket height of tracers shall not exceed 2 m for LS1 steam and 7m MS2 steam.
2.4.5. Tracers need not have drains even if there should be any pocket.
2.4.6. Each tracer line shall generally have its own steam supply valve and condensate trap.
Where the tracers have no pocket and possibility of gravity flow of condensate from all
connected tracer condensate lines (including horizontal piping) is assured, more than 2
tracers may be connected with one trap. In this case, each tracer shall have equivalent lengthand the sum of tracer length shall not exceed the allowable length specified in Paragraph
2.4.2.
2.4.7. Sampling connections, drains, vents, and in-line instruments, such as pressure gauge etc.,
attached to piping or equipment shall generally be traced with the tracer for the piping or
equipment.
2.4.8. The safety valves shall be traced as close as possible to valve seat to avoid malfunction.
2.4.9. The tracer insulated with adequate spacer shall be applied for the following items. (Refer
to Figure 2 of Attached Figures)
Items to be protected from excessive heating, e.g. valves with non metallic seals, caustic
lines.
2.4.10. All tracers (including tracer supply and return) shall be extremely flattened.
2.4.11. Tracers shall be fixed with steel bands or steel wire at approximately 1 m intervals; however
such intervals shall be adequately shortened at the bent place where tracers are not
contacted sufficiently with the pipe.
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2.4.12. Expansion loops shall be provided at approx. 24 m intervals. Loops at pipe fittings, changes indirection, valves, and flanges shall serve as expansion loops. (Refer to Figure 3 of Attached
Figures)
2.4.13. The standard locations of tracers are shown in Figure 4 of Attached Figures.
2.5. Condensate Pipes
2.5.1. If condensate is recovered, a block valve shall be installed in each outlet line of the condensate
trap.
2.5.2. Where condensate is recovered, the condensate manifold shall be, in general, provided only
where there are a minimum 3 condensate or return lines grouped within a 3 meter radius and its
size shall generally be 2(NPS).
2.5.3. In case of condensate, the condensate shall be discharged to the sewer where the
condensate discharge does not give hazard for personnel and not make corrosive
environment for piping and steel structure.
2.6. Supports
All pipes including tracer supplies and returns shall be adequately supported in the field.
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Table 1: Minimum numbers of tracers
Trace size 10 mm
S S S
1 S S S
1 S S S
2 S S S
2 S S S
3 S S S
4 D S S
5 D S S
6 D S S
8 D S S
10 S S
12 D S
14 D D
16 D D
18 D D
20 D D
22 D D
24 T D
26 T D
28 T D
Pipe
size
(In
ch)
30 T T
Note:
1. S: Single
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2. D: Double
3. T: Triple
4. Steam (LSI): 147oC
5. Fluid Temperature: 50oC
6. Maintained Temperature: 50oC
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Table 2: Minimum numbers of tracers
Trace size 10 mm
S S S
1 S S S
1 S S S
2 S S S
2 S S S
3 S S S
4 D S S
5 D S S
6 D S S
8 D S S
10 D S S
12 D S
14 D S
16 D D
18 D D
20 D D
22 D D
24 D D
26 T D
28 T D
Pipe
size
(In
ch)
30 T D
Note:
1. S: Single
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2. D: Double
3. T: Triple
4. Steam (LSI): 147oC
5. Fluid Temperature: 50oC T 100
oC
6. Maintained Temperature: 50oC
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Table 3: Minimum numbers of tracers
Trace size 10 mm
D S S
1 D S S
1 D S S
2 S S
2 D S
3 D D
4 D D
5 D D
6 D D
8 T D
10 T T
12 T
14 T
16
18
20
22
24
26
28
Pipe
size
(In
ch)
30
Note:
1. S: Single
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2. D: Double
3. T: Triple
4. Steam (LSI): 147oC
5. Fluid Temperature: T 50oC
6. Maintained Temperature: 80oC
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Table 4: Minimum numbers of tracers
Trace size 10 mm
D S S
1 D S S
1 D S S
2 S S
2 D S
3 D D
4 D D
5 D D
6 D D
8 T D
10 T D
12 T T
14 T
16 T
18
20
22
24
26
28
Pipe
size
(In
ch)
30
Note:
1. S: Single
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2. D: Double
3. T: Triple
4. Steam (LSI): 147oC
5. Fluid Temperature: 50oC T 100
oC (CKB, QOD)
6. Maintained Temperature: 80oC
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Table 4: Minimum numbers of tracers
Trace size 10 mm
S S S
1 S S S
1 D S S
2 D S S
2 D S S
3 D S S
4 D S S
5 D S S
6 D S
8 D S
10 D D
12 D D
14 D D
16 T D
18 T D
20 T T
22 T T
24 T T
26 T
28 T
Pipe
size
(In
ch)
30 T
Note:
1. S: Single
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2. D: Double
3. T: Triple
4. Steam (MS 2): 191oC
5. Fluid Temperature: 50oC T 100
oC
6. Maintained Temperature: 80oC
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Table 5: Minimum numbers of tracers
Trace size 10 mm
D S S
1 D S S
1 D S S
2 D S S
2 D S S
3 D S S
4 D S S
5 S S
6 D S
8 D D
10 D D
12 D D
14 D D
16 T D
18 T D
20 T T
22 T T
24 T
26 T
28 T
Pipe
size
(In
ch)
30
Note:
1. S: Single
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2. D: Double
3. T: Triple
4. Steam (MS 2): 191oC
5. Fluid Temperature: 100oC T 150
oC
6. Maintained Temperature: 80oC
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Table 6: Minimum numbers of tracers
Trace size 10 mm
D S S
1 D S S
1 D S S
2 D S S
2 D S S
3 D S S
4 D S S
5 D S
6 D S
8 D D
10 D D
12 D D
14 D D
16 D D
18 T D
20 T D
22 T T
24 T T
26 T
28 T
Pipe
size
(In
ch)
30
Note:
1. S: Single
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2. D: Double
3. T: Triple
4. Steam (MS 2): 191oC
5. Fluid Temperature: 150oC T 200
oC
6. Maintained Temperature: 80oC
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