PURPOSE AND USE OF PROCESS INDUSTRY PRACTICES
In an effort to minimize the cost of process industry facilities, this Practice has been
prepared from the technical requirements in the existing standards of major industrial users,
contractors, or standards organizations. By harmonizing these technical requirements into a
single set of Practices, administrative, application, and engineering costs to both the
purchaser and the manufacturer should be reduced. While this Practice is expected to
incorporate the majority of requirements of most users, individual applications may involve
requirements that will be appended to and take precedence over this Practice. Determinations
concerning fitness for purpose and particular matters or application of the Practice to
particular project or engineering situations should not be made solely on information
contained in these materials. The use of trade names from time to time should not be viewed
as an expression of preference but rather recognized as normal usage in the trade. Other
brands having the same specifications are equally correct and may be substituted for those
named. All Practices or guidelines are intended to be consistent with applicable laws and
regulations including OSHA requirements. To the extent these Practices or guidelines should
conflict with OSHA or other applicable laws or regulations, such laws or regulations must be
followed. Consult an appropriate professional before applying or acting on any material
contained in or suggested by the Practice.
This Practice is subject to revision at any time.
© Process Industry Practices (PIP), Construction Industry Institute, The University of Texas at
Austin, 3925 West Braker Lane (R4500), Austin, Texas 78759. PIP Member Companies and
Subscribers may copy this Practice for their internal use. Changes or modifications of any kind
are not permitted within any PIP Practice without the express written authorization of PIP.
Authorized Users may attach addenda or overlays to clearly indicate modifications or
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These purposes include but are not limited to the procurement process (e.g., as attachments to
requests for quotation/ purchase orders or requests for proposals/contracts) and preparation and
issue of design engineering deliverables for use on a specific project by Authorized User’s
client. PIP’s copyright notices must be clearly indicated and unequivocally incorporated in
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Practice.
PUBLISHING HISTORY
July 2008
April 2014
January 2020
Issued
Complete Revision
Reaffirmation w/Ed Rev
Not printed with State funds
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~iP
PROCESS
’ N D US
REAFFIRMATION W/EDITORIAL REVISION
January 2020
TR Y
PRACTI CES
Process
Control
PIP PCFTE100
Thermowell Fabrication Details
Table of Contents
1.
2.
SCOPe..iriiccr
et
2
References ........ccccceeevvvivireeeennennns 2
Process Industry Practices ............cc......... 2
Drawings
PCFTE101
— Threaded Tapered Thermowell
PCFTE102 — Flanged Tapered Thermowell
PCFTE103 — Weld-in Tapered Thermowell
PCFTE104 — Socketweld Tapered Thermowell
Process Industry Practices
Copyright Process Industry Practices
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No reproduction or networking permitted without license from Accuris
e
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PIP PCFTE200
REAFFIRMATION
W/EDITORIAL REVISION
Thermocouple Fabrication Details
1.
January 2020
Scope
This Practice describes the minimum requirements for fabricating threaded, flanged, weld-in, and
socketweld tapered thermowells.
2.
References
Applicable parts of the following Practices shall be considered an integral part of this Practice.
The edition in effect on the date of contract award shall be used, except as otherwise noted. Short
titles are used herein where appropriate.
Process Industry Practices (PIP)
—
PIP PCCTEOQO01 — Temperature Measurement Design Criteria
—
PIP PCETEQ01 — Temperature Measurement Guidelines
Process Industry Practices
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1 3/4"+T
U
MAXIMUM
FLUID
11/16" MAX.
BORE
0.260”
STAMP
THERMOWELL
[
MODEL
TW
1/8"—y
TAG
NO.
ON
WRENCH
NO.
TAPERED THREADED THERMOWELL PER
F | FABRICATION TYPE
[T [ THREADED, TAPERED THERMOWELL
INSERTION LENGTH
T1/7"
71/2"
10 1/2"
SPECIFY
T
0
3
X
|
[wlrfu
f—
FLAT
TYPE
™w
FABRICATION
DETAIL
PCFTE101
U DIMENSION
INSTALLATION | pPIPE SIZE
IN ELBOW
LAG EXTENSION NOTE 1
NO EXTENSION (STANDARD)
M
S
X
INTO PIPE
WELL MATERIAL
316 SS (STANDARD)
SPECIFY
Ju
2" &
SMALLER
3-6"
> 6"
PERPENDICULAR
3
SPECIFY
[r T
u
NOTES
DIMENSION
41/2" | SWAGE UP
T0 2"
7 /2
10 1/2"
| < 6"
6
8
10"—12"
> 12"
-
INSTALL
|
LENGTH TO BE SPECIFIED BASED UPON THE THICKNESS OF
THE PIPE (OR EQUIPMENT) WHERE THE TW IS INSTALLED.
2) SPECIFY TO TW FABRICATOR:
U — INSERTION LENGTH
T — LAG EXTENSION
M — MATERIAL OF CONSTRUCTION
3) TW
TO
BE
FABRICATED
4) TW
TO
MEET
CRITERIA
FROM
FOR
IN _ELBOW
4
1/2° | PREFERRED INSTALLATION
41/2°
|IS IN ELBOW DUE TO
7
1/2
VELOCITY CONSIDERATIONS
10 1/2”
NOTES:
1) LAG EXTENSION
INSULATION ON
(FEET PER SECOND)
INSERTION LENGTH "U”
4 1/2"
17 1/2" [10 1/27
120
80
50
50
30
20
THIS TABULATION IS INTENDED TO BE USED ONLY
AS A GUIDE. THESE VELOCITIES ARE BASED UPON:
13 GAS VELOCITY BASED UPON FLOWING AIR AT STP
2) THE INSERTION LENGTH IS THE UNSUPPORTED LENGTH
ASSUMED TO ALL BE EXPOSED TO THE PROCESS FLUID
FLOW. THESE ARE CONSERVATIVE VALUES BASED ON
THERMOWELLS INSERTED INTO A PIPE PERPENDICULAR
TO THE FLOW. THESE VALUES MAY BE INCREASED FOR
LOW MOLECULAR WEIGHT GASES. CALCULATIONS BASED
UPON ACTUAL PROCESS CONDITIONS MAY ALLOW THESE
VALUES TO BE EXCEEDED.
| 5/8"
|
1 3/8" HEX
NPT\
1/16” RADIUS
LIMITATIONS
AR
WATER
1/2°
1" NPT \
VELOCITY
A SINGLE
PROCESS
INDUSTRY
FABRICATION
PIECE
CONSTRUCTION
OF
SHOWN
METAL
IN PIP
(NO
WELDING).
PCCTEOQO1.
PRACTICES
DETAILS
THREADED
TAPERED THERMOWELL
FiP
PRACTICE
REF.
PCFTE100
PAGE
1
OF
1
ISSUED: APR 2014
REAFFIRMED: AUG 2019
01
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3/16"
—
RADIUS
Jr1 1/16”
BORE
0.260"
1/4" ~T
N
1/2" NPT —=
)
7 /)
SPECIFY
T
[AG EXTENSION
2
2 1/4" (STANDARD)
X
SPECIFY
M
S
X
STAMP TW TAG NO.———
ON THE OUTSIDE
EDGE OF THE
FLANGE
MAXIMUM
FLUID
VELOCITY
v_[*
LIMITATIONS
(FEET PER SECOND)
INSERTION LENGTH
"U
7"
10”
16”
AR
80
50
20
WATER
30
20
15
THIS TABULATION IS INTENDED TO BE USED ONLY
AS A GUIDE. THESE VELOCITIES ARE BASED UPON:
1) GAS VELOCITY BASED UPON FLOWING AIR AT STP
2) THE INSERTION LENGTH IS THE UNSUPPORTED LENGTH ASSUMED TO ALL BE EXPOSED
TO AIR FLOW. THESE ARE CONSERVATIVE VALUES BASED ON THERMOWELLS INSERTED
INTO A PIPE PERPENDICULAR TO THE FLOW. THESE VALUES MAY BE INCREASED FOR
LOW MOLECULAR WEIGHT GASES. CALCULATIONS BASED UPON ACTUAL PROCESS
CONDITIONS MAY ALLOW THESE VALUES TO BE EXCEEDED.
U DIMENSION
INSTALLATION
IN PIPE ELBOW
PERPENDICULAR
INTO PIPE
TANKS, VESSELS
PIPE SIZE
2" &
SMALLER
=5
> 6"
u
DIMENSION
7"
o
10”
< 6"
—
INSTALL
7
PREFERRED INSTALLATION
6— 8
>8
| ———
10
16"
Copyright Process Industry Practices
Provided by Accuris under license with PIP
No reproduction or networking permitted without license from Accuris
NOTES
SWAGE UP
T0 2"
7
v
WELL
[ ]
INDUSTRY
FABRICATION
PRACTICES
=g P
DETAILS
IS IN ELBOW DUE TO
VELOCITY CONSIDERATIONS
REVIEW VESSEL
FOR INTERNAL
OBSTRUCTIONS
(TRAYS, MIXERS,
MATERIAL
|316 SS (STANDARD)
|SPECIFY
R |FLANGE RATING AND SIZE
(INCLUDE_SPECIAL FINISH, IF REQ'D)
11/2° 150§ RF
11/2" 300# RF
SPECIFY
NOTES:
1) LAG EXTENSION LENGTH TO BE SPECIFIED
BASED UPON THE THICKNESS OF INSULATION ON THE
PIPE (OR EQUIPMENT) WHERE THE TW IS INSTALLED.
2) SPECIFY TO TW FABRICATOR;
U — INSERTION LENGTH
T — LAG EXTENSION
M — MATERIAL OF CONSTRUCTION
R — FLANGE SIZE AND RATING
3) FLANGE MATERIAL SHALL BE THE SAME AS THE
THERMOWELL MATERIAL.
4) MANUFACTURER SHALL SPECIFY THAT THE THERMOWELL
IS DESIGNED AND CONSTRUCTED IN ACCORDANCE
WITH ASME CODE FOR PRESSURE VESSELS AND PIPING.
5) STRAIGHT OR STEPPED SHANK WELL SHALL NOT BE
SUBSTITUTED WITHOUT VELOCITY LIMIT CALCULATIONS.
6) TW TO MEET CRITERIA FOR CONSTRUCTION SHOWN IN
PIP PCCTEOO1.
PROCESS
IN FLBOW
v
DETAIL PCFTE102
=
<
PENETRATION
DOUBLE WELD
X OO0 w|C
FULL
THERMOWELL MODEL NO.
[
TYPE
W
FLANGED THERMOWELL PER FABRICATION
F
FABRICATION TYPE
F
FLANGED, TAPERED THERMOWELL
INSERTION LENGTH
RF FLANGE (F)
(PER ASME B16.5)
5/8"
l~———
PRACTICE
FLANGED
TAPERED
THERMOWELL
REF.
PCFTE100
PAGE
1
OF
1
ISSUED: APR 1999
REAFFIRMED: AUG 2019
PCFTE102
ETC.)
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STAMP TW MODEL
NUMBER ON END
OF TW
BORE
0.260”
N
|
2
1y~
¥pr
N
PYWW\
]
/\/\/\/\/
FABRICATION
TYPE
[W__[WELD=IN_TAPERED THERMOWELL
U
INSERTION LENGTH
B
21/2"
M
Ju
EXTENSION
X
SPECIFY
M
WELL MATERIAL
S
3165S (STANDARD)
X
SPECIFY
J*
[
(NOTE
1)
INSTALLATION
INTO PIPE
|< 4”
>4
U
NOTES
DIMENSION
2 1/2" | SWAGE UP TO 4"
4 1/7
— —
—
— | INSTALL
41/2"
IN ELBOW
| PREFERRED INSTALLATION
IS IN_ELBOW DUE_TO
VELOCITY CONSIDERATIONS
4) TW
SHOWN
CONSTRUCTION
Copyright Process Industry Practices
Provided by Accuris under license with PIP
No reproduction or networking permitted without license from Accuris
R
PROCESS
INDUSTRY
FABRICATION
THERMOWELL IS DESIGNED AND
CODE FOR PRESSURE VESSELS
FOR
SIZE
]
3) MANUFACTURER SHALL SPECIFY THAT THE
CONSTRUCTED IN ACCORDANCE WITH ASME
AND PIPING.
CRITERIA
PIPE
2" &
SMALLER
PERPENDICULAR
2) SPECIFY TO TW FABRICATOR:
U — INSERTION LENGTH
T — LAG EXTENSION
M — MATERIAL OF CONSTRUCTION
MEET
300
U DIMENSION
T & LARGER|
LAG
|2” (STANDARD)
500
WATER
150
100
THIS TABULATION IS INTENDED TO BE USED ONLY
AS A GUIDE. THESE VELOCITIES ARE BASED UPON:
1) GAS VELOCITY BASED UPON FLOWING AIR AT STP
2) THE INSERTION LENGTH IS THE UNSUPPORTED LENGTH
ASSUMED TO ALL BE EXPOSED TO THE PROCESS FLUID
FLOW. THESE ARE CONSERVATIVE VALUES BASED ON
THERMOWELLS INSERTED INTO A PIPE PERPENDICULAR
TO THE FLOW. THESE VALUES MAY BE INCREASED FOR
LOW MOLECULAR WEIGHT GASES. CALCULATIONS BASED
UPON ACTUAL PROCESS CONDITIONS MAY ALLOW THESE
VALUES TO BE EXCEEDED.
P
NOTES:
1) LAG EXTENSION LENGTH TC() BE SPECIFIED)BASED UPON THE THICKNESS OF
INSULATION ON THE PIPE (OR EQUIPMENT) WHERE THE TW IS INSTALLED.
TO
AR
o
IN ELBOW
T
2
[(w]w
_
u
f
THERMOWELL MODEL NO.
TYPE
WELD—IN _TAPERED THERMOWELL PER FABRICATION DETAIL PCFTE103
[F
MAXIMUM VELOCITY LIMITATIONS (FEET PER SECOND)
FLUID
INSERTION LENGTH "U”
2 1/2"
4 1/7
['s)
[
T
ow
/e
/
IN PIP
PRACTICES
DETAILS
&
o |
PRACTICE
WELD—-IN
TAPERED
THERMOWELL
PCCTEOQO1.
REF.
PCFTE100
PAGE
1
OF
1
ISSUED: NOV 1999
REAFFIRMED: AUG 2019
PCFTE103
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134+
T
|
v
11/16”
.
o0
b
V2
NPT\
)
]
I
F
—
MAXIMUM VELOCITY LIMITATIONS (FEET PER SECOND)
FLUID
BORE 0.260”
—
¢
|
R
<
C
1/16"
.,
RADIUS
.
1/4"—
-
LOW MOLECULAR
[F__[FABRICATION TYPE
[[S”
[ SOCKET—WELD, TAPERED THERMOWELL
Y
INSERTION LENGTH
c
D
71/2"
10 1/2
B
X
4172
Ju
[*
EXTENSION (STANDARD)
NO
pe
SPECIFY
M
WELL MATERIAL
S
316 SS (STANDARD)
X
SPECIFY
[»
ON THE PIPE (OR EQUIPMENT) WHERE
THE TW IS INSTALLED.
2) SPECIFY TO TW FABRICATOR:
) U — INSERTION
BASED
INSTALLATION | pIPE SIZE
u
2" &
41/2"
T
T
SMALLER
:
PERPENDICULAR | Z < g'
6"
INTO PIPE
8
10°-12"
S 1o
NOTES
DIMENSION
| SWAGE UP TO 2"
5
10172
o
INSTALL IN_ELBOW
PREFERRED INSTALLATION
]IS IN ELBOW DUE TO
VELOCITY CONSIDERATIONS
2|
41/2"
7RV1/2
|
NOTES:
1) LAG EXTENSION LENGTH TO BE SPECIFIED BASED UPON THE THICKNESS OF
INSULATION
CALCULATIONS
U DIMENSION
IN ELBOW
SPECIFY
T
LAG_EXTENSION (T) NOTE 1
30
X
[wlF
(U)
WEIGHT GASES.
UPON ACTUAL PROCESS CONDITIONS MAY ALLOW THESE
VALUES TO BE EXCEEDED.
STAMP TW TAG NO. ON SIDE OF TW
THERMOWELL MODEL NO.
[
TYPE
w
TAPERED SOCKETWELD THERMOWELL PER FABRICATION DETAIL PCFIE104
INSERTION LENGTH "U”
41/2° |7 1/2° [10 172
AR
120
80
50
WATER
50
30
20
THIS TABULATION IS INTENDED TO BE USED ONLY
AS A GUIDE. THESE VELOCITIES ARE BASED UPON:
13 GAS VELOCITY BASED UPON FLOWING AIR AT STP
2) THE INSERTION LENGTH IS THE UNSUPPORTED LENGTH
ASSUMED TO ALL BE EXPOSED TO THE PROCESS FLUID
FLOW. THESE ARE CONSERVATIVE VALUES BASED ON
THERMOWELLS INSERTED INTO A PIPE PERPENDICULAR
TO THE FLOW. THESE VALUES MAY BE INCREASED FOR
LENGTH
T — LAG EXTENSION
M — MATERIAL OF CONSTRUCTION
3) TW TO BE FABRICATED FROM A SINGLE PIECE OF METAL (NO WELDING).
4) TW TO MEET CRITERIA FOR CONSTRUCTION SHOWN IN PIP PCCTEQO1.
Copyright Process Industry Practices
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PROCESS
INDUSTRY
FABRICATION
SOCKETWELD
TAPERED
PRACTICES
==
'
DETAILS
W
THERMOWELL
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.
'
PRACTICE REF. PCFTE100
PAGE
1 OF
1
R
.
R 20
019