PWHT Procedure F3 - Code - 1

Page 1 of 24
Subcontractor’s Name : AL-KULAIB INTERNATIONAL
Subcontractor No. : 0-6798-Z-3160-002
Project Name : KNPC Clean Fuel Project
Subcontractor Work Package : SMP Construction Work
DOCUMENT TITLE : Post Weld Heat Treatment Procedure (PWHT)
Subcontractor’s Doc. No. : VS3160-002-A-2016
KNPC CLEAN FUELS PROJECT
Subcontractor
ISSUE PURPOSE: FA FR FI FC AB
Approval or review hereunder shall not be [ construed to relieve Vendor / Subcontractor of his
T
responsibilities and liability under the Contract.
y CTR DEPT. /
Contractor Review Result
p SIGNATURE
 1. Approvede / No Comments
2. Approved / Reviewed - Minor Comments U C JI

a FQCM
3. Rejected - Comments as Noted
/
4. Rejected
q Mohd. Ali,
5. Not Reviewed QCI
u
JOB. NO. o 0-6798-20-0000
t REV
COMPANY
DOC.no. P6011MAA.000.10.51.5270
e
V plus Purchaser Code (V/J/G/S) &Subcontract No. - SERIAL no.
Contractor f F3
DOC.no. VS3160-002-A-2016
r
o CFP Project
KNPC DSN:
m Package
MAA 34740
REVIEW BY: DISCIPLINE: DATE:
CODE:
1 BFt QCM 19/02/17
h
REVIEW CODE: 1: Approved\No Comments; 2: Minor Comments;
e
3: Comments as Noted; 4: Rejected
d
o
AL-KULAIB INTERNATIONAL
COMMENTS RESPONSE SHEET
Doc. No.: VS3160-002-A-2016
Doc. Name: Post Weld Heat Treatment Procedure (PWHT)
Client: SKEC / KNPC – MAA
Date 17-Feb-2017
Project Clean Fuels Project – KNPC MAA Refinery
Sl.
Company / Contractor Comments Al-Kulaib Response JGSK Comments
No.
1 N/A Para 5.6 (PWHT) Revised Noted
PWHT Line Class Table revised based on approved

2 N/A Noted
Project Material Specification S-000-1360-0002V_F7
Page 2 of 24
PROJECT: Document ID Code:

VS3160-002-A-2016
Post Weld Heat Treatment Rev.
Procedure F3
Project Title :
Construction of SKEC Packages

KNPC – CFP MAA PROJECT
Document Title :
Post Weld Heat Treatment Procedure
F3 16-Feb-17 Issued for Final Sanal Sajo H C Jung
F2 08-Oct-16 Issued for Final Sanal Sajo H C Jung
F1 11-Aug-16 Issued for Final Sanal Sajo H C Jung
A3 25-Jul-2016 Issued for Company Review Sanal Sajo H C Jung
A2 16-Jun-2016 Issued for Company Review Sanal Sajo H C Jung
A1 11-Apr-2016 Issued for Company Review Sanal Sajo H C Jung
O1 13-Feb-2016 Issued for JGSK Comments Sanal Sajo H C Jung
REV DATE DESCRIPTION PREPARED BY CHECKED BY APPROVED BY
Sub-Contractor NO.
Document No. REV.
Job Code.
0-6798-Z-3160-002 (CFP-MAA) 0-6798-20-0000 VS3160-002-A-2016 F3
Page 3 of 24

VS3160-002-A-2016
Procedure F3
Record of Revisions
Rev. No. Page/Section Description

O1 Issued for Comments
A1 Issued for Review
F1 Issued for Construction

F2 Comments Incorporated & Issued for Construction
F3 Page 12, 13, 21~23 Comments Incorporated & Issued for Construction
Sub-Contractor NO. Job Code. Document No. REV.
0-6798-Z-3160-002 (CFP-MAA) 0-6798-20-0000 VS3160-002-A-2016 F3

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VS3160-002-A-2016
Procedure F3
TABLE OF CONTENTS
SECTION TITLE PAGE
1.0 PURPOSE 5
2.0 SCOPE 5
3.0 REFERENCES 5
4.0 DEFINITIONS 6
5.0 PROCEDURE 6
5.1 EQUIPMENT 6
5.2 PERSONNEL 6
5.3 HEATING ARRANGEMENT 7
5.4 THERMOCOUPLE 8
5.5 INSULATION 11
5.6 PWHT 12
5.7 INTERRUPTED PWHT 13
5.8 HARDNESS TEST 14
5.9 SAFETY 14
5.10 REPORTING 14
6.0 REFERNCE ATTACHMENTS 15-22
ATTACHMENT-A - REPORT FORM

ATTACHMENT-B - PWHT STICKER
ATTACHMENT-C - Preheat Temperature
ATTACHMENT-D -Post Weld Heat Treatment
ATTACHMENT-E - PWHT Requirement as per Piping Class
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VS3160-002-A-2016
Procedure F3
1.0 PURPOSE
The purpose of this procedure is to provide the specific requirements to perform the
Pre-heating & Post Weld Heat Treatment to meet the specific contractual
specifications and requirements of the Project - Clean Fuels Project (CFP), KNPC.
2.0 SCOPE
This document describes the requirements for Pre-heating and Post Weld Heat
Treatment of piping fabrication/erection welds using Electric Resistance Method
(Local heat treatment). This document has specific reference to the Project – Clean
Fuel Project (CFP), KNPC
3.0 REFERENCES
3.1 ASME Sec V - Non-Destructive Examination

3.2 ASNT-SNT-TC1A - Recommended Practice for Non-
- Destructive Testing Personnel.
3.3 VS3160-002-A-2017 - Hardness Test Procedure

3.4 ASME Sec VIII - Pressure Vessels
3.5 ASME B31.3 - Process Piping
3.6 ASME B31.8 - Gas Transportation & Distribution
Piping System
3.7 ASME B31.4 - Pipeline Transportation system for

Liquid Hydrocarbons
3.8 Shell DEP 31.38.01.31- Gen. - Shop and field fabrication of piping
3.9 31.38.01.31-P6000CFP-000-PV - Proj. Variation to SHELL
DEP31.38.01.3, Shop and Field
Fabrication of Piping
3.10 30.10.60.18-P6000CFP-000-PV - Proj. Variation to SHELL
DEP30.10.60.18, Welding of Metal
(Amendments/Supplements to API RP 582)
3.11 Shell DEP 30.10.02.17-Gen - Wet H2s Requirements For Downstream

Pressure Vessels and Piping
3.12 API RP 582, Rev.2001 - Welding Guidelines for the Chemical, Oil
and Gas Industries
3.13 KNPC Eng. Std. 50D11 - Standard Specification Piping Welding

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VS3160-002-A-2016
Procedure F3
4.0 DEFINITIONS
4.1 ASME - American Society of Mechanical Engineers
4.2 ASNT - American Society for Non-destructive Testing
4.3 PWHT - Post Weld Heat Treatment
4.4 COMPANY - Kuwait National Petroleum Company
4.5 HB - Brinell Hardness
4.6 HAZ - Heat Affected Zone
4.7 HV - Vickers Hardness
5.0 PROCEDURE
5.1 EQUIPMENT
 50KVA 6 Point Globe heat treatment transformer

 60 KVA Power Regulator
 Ceramic mat heating coil
 K. Type Thermocouple wire
 Copper / constantan Compensating wire
 Temperature Recorder - 12 point chino or dahua recorder
 Capacitance discharge type thermocouple welding attachment
 Mineral wool insulation
 Hardness tester –Equotip portable hardness tester.
All the above items wherever applicable, valid test certificates, equipment calibration
certificates must be submitted before using it.
5.2 PERSONNEL
Personnel involved in heat treatment operation shall be experienced and

familiar with operation of the equipments. Personnel qualification and
experience details shall be submitted to the company for approval prior to
start any PWHT work.
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VS3160-002-A-2016
Procedure F3
5.3 HEATING ARRANGEMENT
5.3.1 LOCAL HEAT TREATMENT(PWHT)
When the heat treatment is applied locally, a circumferential band of the run
pipe and the branch where applicable shall be heated until the specified
temperature range exists over the entire section a band which includes the
weldment section and at least a length of 2.5 √Rt mm from the centre of the
weld (Where R is the inside radius in mm & t is the wall thickness in mm) on
either side.
Pipe ends, flange tees, Flange faces, bolt threads and machined surfaces
shall be protected with mineral wool wrapping to avoid excessive oxidation
and dissipation of heat.
All flammable substances shall be removed from the heat treatment area.
Heating pads shall be centered on the weld for PWHT at least a length of 2.5
√Rt mm from the centre of the weld (Where R is the inside radius in mm & t is
the wall thickness in mm) on either side.
These elements shall be applied either as a single band or two discrete bands
arranged symmetrically above the centreline of the weld.
For pipe sizes 10" and above, heating pads shall be arranged to have
independent control of temperature for top and bottom halves.
Electrical resistance heating element in the form of flat ceramic heater pad
shall be used.
Elements shall be securely fixed in contact with the work piece by stainless
steel / mild steel banding tape or soft iron tie wire. Under no circumstances
shall galvanized wire be utilized.
Heating elements shall be thoroughly examined before use in-order to ensure

that the element wire is not exposed. Examination shall be made for ensuring
freedom from brocken beads in either the pad or the leads. Twist lock
connections shall also be examined to ensure that the insulation is sound and
that a good electrical joint is made.
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VS3160-002-A-2016
Procedure F3
Each circuit or heating element shall be controlled either by a contactor or

suitable solid state switching circuit; in turn this circuit shall be controlled by
one of the following system.
i) A combination of set point temperature controller and a percentage

timer / energy regulator. The set point temperature controller shall be
employed to ensure limiting temperature control during the soaking
period.
ii) An automatic pre-set programme control unit to control automatically
the heat treatment throughout its cycle.
5.3.2 PRE HEATING
When Pre Heating is applied by electric resistance method, a circumferential

band of the run pipe shall be heated until the specified temperature range
exists over the entire section of a band which includes the bevel section and
at least 2t or 100 mm (whichever is larger) beyond the ends on either side.
Heating elements shall be securely fixed in contact with the work piece by
stainless steel / mild steel banding tape or soft iron tie wire. Under no
circumstances shall galvanized wire be utilized
Pre heating temperature shall comply with the applicable piping code (Refer
attachment C)
The weld shall be completed before the preheat temperature is lowered;

except that intermediate lowering of preheat temperature is permitted for
unalloyed steels if at least 50% of the weld has been completed.
The joint shall be cooled under insulation.
Preheating shall be restored specified temperature and maintained for 30

minutes before welding is recommenced.
5.4 THERMOCOUPLE
Type K thermocouple wires as per BS 4937 part -4 / BS EN 60584 having -

0.75% error or not more than +0.75% throughout the controlled PWHT
temperature range shall be used to measure the temperature. If there is any
error / deviation in temperature found during calibration of thermocouple, the
same shall be considered in the actual PWHT and the soaking temperature
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VS3160-002-A-2016
Procedure F3
shall be adjusted accordingly. The wires shall be attached to the heating

surface by means of capacitance discharge method using capacitance
discharge type thermocouple welding attachment unit and shall be ensure
that there is no damage to the work piece. The distance between the 2
thermocouple wires at the junction shall be 3 to 6mm.
Thermocouple shall be positioned on the OD of the weld OR on the HAZ as

shown in fig 5 of 30.10.60.18-P6000CFP-000-PV
FIGURE 1
Batch certificates for thermocouple wire from the manufacturer shall be

submitted to Contractor/Client for review prior to use if required.
Sufficient number of thermocouples shall be provided for accuracy of

measurement. Thermocouple shall be located at the middle points of the
respective heating zone. The temperature shall be measured one inch away
from the weld.
No. of
Size of Pipe(OD) Location
Thermocouples
OD 2” below 1 (as per figure 1) Bottom side of the weld
OD 2” ~ 10” 2 (as per figure 1) Bottom & top side of the weld
Bottom ,3 o’clock & top side of

OD 10” above 3 (as per figure 1)
the weld
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VS3160-002-A-2016
Procedure F3
Thermocouples shall be maintained in such a way to avoid touching each

other than at the welded junction (Hot junction). Compensating lead wires
shall be away from the hot junction. Thermocouple hot junctions shall be
insulated by the application of high temperature putty.
Calibrated Copper/Constantan cables shall be used for extension of the

thermocouple to the temperature recorder. Compensating lead connections
shall be located at a minimum distance of 500mm from the heated zone.
Following each heat treatment a minimum of 150mm length of wire measured
from the hot zone shall be discarded.
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VS3160-002-A-2016
Procedure F3
The copper lead (+ve) shall be connected to the Nickel Chromium conductor of the
thermocouple (non-magnetic) and the constantan lead (-ve) shall be connected to
Nickel-Aluminium conductor (magnetic)
Temperature recorder shall be of the potentiometric self-compensating type,

calibrated in degree Celsius with respect to a nickel-chromium / Nickel-Aluminium
thermocouple (Type-K).
Temperature recorder shall be calibrated at intervals not exceeding 6 months; the

acceptable deviation is 0.5% of full scale. Instrument used for calibration shall have
its own calibration at intervals not exceeding 12 months.
The chart speed shall be set at 25 mm per hour and it shall be recorded in the PWHT
sticker.
5.4.1 SPECIAL REQUIREMENTS FOR PWHT
It is required to carry out post heat treatment after welding. Such heat treatment can
be carried out with 1 temperature sensor if the following conditions are satisfied when
there are a few welding each place contained within the range of 1 power control.
a. Equal material quality

b. Equal size
c. Equal thickness
Carry out heat treatment under the instruction of the Subcontractor field technical
designer in accordance with the tolerance of the special requirements specified in
paragraph 331.2. ASME B 31.3.
As per 50D11 of KNPC standard, PWHT requirements of P3 to P6 material, shall be perform

immediately after welding. If impractical to do so, the welded material shall be insulated to
ensure slow cooling. This procedure does not eliminate PWHT.
5.5 INSULATION
5.5.1 LOCAL HEAT TREATMENT (PWHT)
Mineral wool mats of sufficient thickness shall be provided for insulating heater coils.
The thickness of insulation shall depend on the pipe diameter, wall thickness and joint
configuration. The width of insulation shall extend to a minimum distance of 5√Rt mm
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VS3160-002-A-2016
Procedure F3
from the weld centre (Where R is the inside radius in mm & t is the wall thickness in
mm) on either side.
Wherever possible, the internal of the pipe shall be sealed with insulating material to
avoid air current creating difference in temperature.
When Pre Heating is applied by electric resistance method, Mineral wool mats of
sufficient thickness shall be provided for insulating heater coils. The thickness of
insulation shall depend on the pipe diameter and wall thickness. The width of
insulation shall extend to a minimum distance of 150 mm from the minimum required
heated zone on either side.
5.6 PWHT
The weld shall be heated uniformly and the temperature raised gradually. The
temperature difference of any two thermocouples shall not be more than 50˚C.
The PWHT soaking temperature range & soaking period shall be as per piping code
ASME B 31.3.
Limitation of the rates of heating / cooling, soaking time and temperature for carbon
steel materials shall be as given below unless otherwise stated specially in the
contract or applicable client specification.
Unrestricted heating : Upto 300°C

Maximum heating rate : 200°C / hr
Soaking Period : 1 hr.(Min.) for wall thickness ≤ 1”.
1 Hr / inch (2.4 min/mm) shall be maintained for above 1” wall thickness.
Soaking temperature : 593°C ~ 649°C
Maximum cooling rate : 200°C / hr
Unrestricted cooling : From 300°C in still air
For CrMo (P4, P5B) material, PWHT temperature shall be 704°C ~ 729°C and
holding time is 2.4min/mm (Min 2 Hours)
Unrestricted heating : Upto 300°C

Soaking Period : 2 hr.(Min.) for wall thickness ≤ 1”.
2 Hr / inch (2.4 min/mm) shall be maintained for above 1” wall thickness.
Maximum cooling rate : 200°C / hr
Unrestricted cooling : From 300°C in still air
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VS3160-002-A-2016
Procedure F3
For Stabilized Stainless steel (TP347H + TP347H) Material

Holding Time : min 4 Hrs
Maximum cooling rate : Rapid Cooling
For Sour Service, if specified by the principal, the soak time shall be 1 h/in nominal
thickness with a minimum hold time of 1hr at a minimum temperature of 610°C
(1125°F). The maximum PWHT time, temperature and permissible range shall be
governed by the service conditions, requirements set forth by the Principal, the
design code requirements and the material properties as guaranteed by the material
Supplier.
Proper supports shall be provided to the pipe to prevent distortion during the heating
cycle and to avoid undue stress at the time of heat treatment.
The pipe or piping spool shall have no restraint which could prevent it's expansion
and contraction during the PWHT operation.
Protection from rain and wind shall be provided during the PWHT operation. The QC
Inspector shall verify the location and attachment of thermocouple and inspection
and document review shall be carried out as per approved relevant Inspection &
Test plan and project specification. For dissimilar metals the PWHT temperature
shall be approved by the Contractor.
No welding or heating shall be carried out after final PWHT.
5.7 INTERRUPTED PWHT

In case of interruption to the PWHT cycle due to decrease in holding time
with/without exceeding cooling rate due to power failure or equipment malfunction or
any other reason shall be remedied as below:
Exceeded cooling rate:- The PWHT shall be repeated with specified heating rate, full
range of required holding time and controlled cooling as per WPS.
Incomplete holding time:- The heating shall be started with specified heating rate,
held at holding temperature for the balance period required to fulfill the required
holding time and cooled at specified rate .
If the interruption has occurred before reaching the holding temperature, the PWHT
shall be repeated as originally required.
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VS3160-002-A-2016
Procedure F3
5.8 HARDNESS TEST
After the PWHT, hardness survey shall be conducted on the weldment, base metal
and HAZ by using Equotip portable hardness tester as per approved hardness test
procedure. The required hardness value shall be as per Project specifications
5.9 SAFETY
Ceramic beads in heater coils shall be checked for any damage, which would
otherwise cause electric short circuit.
PWHT area shall be cordoned off during the PWHT operation
All cable connections shall be sufficiently insulated.
Fire or fume hazardous substances shall be removed from the pipe surface and the
vicinity of the operation.
Fire and safety Regulations of Client shall be strictly followed.
5.10 REPORTING
PWHT chart and PWHT report with hardness test report shall be presented to
contractor / company latest by the next day. After Contractor / Company verification
and hardness check, the weld shall be cleaned; thermocouple tack will be ground to
enable subsequent NDE.
All relevant details as per the attached sticker form shall be available on the PWHT
chart. Correction on the PWHT chart not permitted without company approval.
Details of the job shall be documented in the attached report form
6.0 REFERENCE ATTACHMENTS

Attachment A - Report form (JGSK-QC-6000-14)
Attachment B - PWHT Sticker
Attachment C - Preheat Temperature
Attachment D - Post Weld Heat Treatment
Attachment E - PWHT Requirement as per Piping Class
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VS3160-002-A-2016
Procedure F3
ATTACHMENT A (PWHT REPORT)

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VS3160-002-A-2016
Procedure F3
Attachment B - PWHT Sticker
AL-Kulaib International Trading Co. Form No. : AK-CFP-H-02

CHART NO. : DATE OF PWHT :
REPORT NO. : CODE :

PROJECT NAM E : PROJECT NO. :
CLIENT CONTRACT NO. : CONTRACTOR NAM E :
SUB CONTRACTOR NAM E : NDE REQUEST NO. :
QC PROCEDURE : THICKNESS :
M ATERIAL : STARTING TIM E :
CHART SPEED : HEATING RATE : COOLING RATE :

RECORDER SL.NO. : HOLDING TEM P. : HOLDING TIM E :
LINE NO. WELD NO. TC POINT COLOR LINE NO. WELD NO. TC POINT COLOR
AL-KULAIB SUB CONTRACTOR CONTRACTOR COM PANY
SIGN
DATE
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VS3160-002-A-2016
Procedure F3
Attachment C – Preheat Temperature
Table 330.1.1 Preheat Temperatures

Base
Metal Weld Metal Specified Min.
P-No. Analysis Nominal Well Tensile Strength, Min. Temperature
or S-No. A-Number Thickness Base Metal Required Recommended
[Note (1)] [Note (2)] Base Metal Group mm In. Mpa ksi ˚C ˚F min/mm hr/in.
1 1 Carbon steel < 25 <1 ≤ 490 ≤ 71 ··· ··· 10 50

≥ 25 ≥1 All All ··· ··· 79 175
All All > 490 > 71 ··· ··· 79 175
3 2, 11 Alloy steels, < 13 < 1/2 ≤ 490 ≤ 71 ··· ··· 10 50

Cr ≤ 1/2% ≥ 13 ≥ 1/2 All All ··· ··· 79 175
All All > 490 > 71 ··· ··· 79 175
4 3 Alloy steels, All All All All 149 300 ··· ···
1/2% ≤ Cr ≤ 2%
5A, 5B, 4, 5 Alloy steels, All All All All 177 350 ··· ···
5C 2 1/4% ≤ Cr ≤ 10%
6 6 High alloy steels All All All All ··· ··· 149˚ 300˚
martensitic
7 7 High alloy steels All All All All ··· ··· 10 50

ferritic
8 8, 9 High alloy steels All All All All ··· ··· 10 50

austenitic
9A, 9B 10 Nickel alloy steels All All All All ··· ··· 93 200
10 ··· Cr-Cu steel All All All All 149-204 300-400 ··· ···
10l ··· 27Cr steel All All All All 149˚ 300˚ ··· ···
11A SG 1 ··· 8NI, 9NI steel All All All All ··· ··· 10 50
11A SG 2 ··· 5NI steel All All All All 10 50 ··· ···
21-52 ··· ··· All All All All ··· ··· 10 50
NOTES:
(1) P-Number or S-Number from BPV Code, Section IX, QW/QB-422.
(2) A-Number from Section IX, QW-442.
(3) Maintain interpass temperature between 177˚C - 232˚C (350˚F - 450˚F)
(4) Maximum interpass temperature 316˚C (600 ˚F)
Page 18 of 24

VS3160-002-A-2016
Procedure F3
Attachment D – Post Weld Heat Treatment
Table 331.1.1 Requirements for Heat Treatment

Base Specified Min. Holding Time
Metal Weld Metal Tensile Brinell
P-No. Analysis Nominal Well Strength, Nominal Well Min Hardness,
or S-No. A-Number Thickness Base Metal Metal Temperature Range [Note (3)] Time, Max.
[Note (1)] [Note (2)] Base Metal Group mm In. Mpa ksi ˚C ˚F min/mm hr/in. hr [Note (4)]
1 1 Carbon steel ≤ 20 ≤ 1/4 All All None None ··· ··· ··· ···
＞20 ＞1/4 All All 593-649 1,100-1,200 2.4 1 1 ···
3 2, 11 Alloy steels, ≤ 20 ＞3/4 ≤ 490 ≤ 71 None None ··· ··· ··· ···
Cr ≤ 1/2% > 20 ＞3/4 All All 593-718 1,100-1,325 2.4 1 1 225
All All > 490 > 71 593-718 1,100-1,325 2.4 1 1 225
4 [Note (5)] 3 Alloy steels, ≤ 13 ≤ 1/2 ≤ 490 ≤ 71 None None ··· ··· ··· ···
1/2% < Cr ≤ 2% ＞13 ＞1/2 All All 704-746 1,300-1,375 2.4 1 2 225
All All > 490 > 71 704-746 1,300-1,375 2.4 1 2 225
5A, 5B, 5C 4, 5 Alloy steels(21/4% < Cr ≤ 10%)

[Note (5)] ≤ 3% Cr and ≤ 0.15% C ≤ 13 ≤ 1/2 All All None None ··· ··· ··· ···
≤ 3% Cr and ≤ 0.15% C > 13 > 1/2 All All 704-760 1,300-1,400 2.4 1 2 241
> 3% Cr or > 0.15% C All All All All 704-760 1,300-1,400 2.4 1 2 241
6 6 High alloy steels martensitic All All All All 732-788 1,350-1,450 2.4 1 2 241
A 240 Gr. 429 All All All All 621-663 1,150-1,225 2.4 1 2 241
7 7 High alloy steels ferritic All All All All None None ··· ··· ··· ···
8 8,9 High alloy steels austenitic All All All All None None ··· ··· ··· ···
9A, 9B 10 Nickel alloy steels ≤ 20 ≤ 3/4 All All None None ··· ··· ··· ···
>20 >3/4 All All 593-635 1,100-1,175 1.2 1/2 1 ···
10 ··· Cr-Cu steel All All All All 760-816 1,400-1,500 Note (10) Note (10) 1 ···
[Note (6)] [Note (6)]
Page 19 of 24

VS3160-002-A-2016
Procedure F3
Attachment D – Post Weld Heat Treatment
Table 331.1.1 Requirements for Heat Treatment (Cont'd)

Base Specified Min. Holding Time
Metal Weld Metal Tensile Brinell
P-No. Analysis Nominal Well Strength, Nominal Well Min Hardness,
or S-No. A-Number Thickness Base Metal Metal Temperature Range [Note (3)] Time, Max.
[Note (1)] [Note (2)] Base Metal Group mm In. Mpa ksi ˚C ˚F min/mm hr/in. hr [Note (4)]
10H ··· Duplex stainless steel All All All All Note (7) Note (7) 1.2 1/2 1/2 ···
10l ··· 27 Cr steel All All All All 663-704 1,225-1,300 2.4 1 1 ···
[Note (8)] [Note (8)]
11A SG 1 ··· 8Ni, 9Ni steel ≤ 51 ≤2 All All None None ··· ··· ··· ···
＞51 ＞2 All All 552-585 1,025-1,085 2.4 1 1 ···
[Note (9)] [Note (9)]
11A SG 2 ··· 5 Ni steel ＞51 ＞2 All All 552-585 1,025-1,085 2.4 1 1 ···
[Note (9)] [Note (9)]
62 ··· Zr R60705 All All All All 538-593 1,000-1,100 Note (10) Note (10) 1 ···
[Note (10)] [Note (10)]
NOTES:
(1) P-Number or S-Number from BPV Code, Section IX, QW/QB-422.
(2) A-Number from Section IX, QW-442.
(3) For holding time in SI metric units, use min/mm (minutes per mm thickness). For U.S. units, use hr/in. thickness.
(4) See para. 331.1.7.
(5) See appendix F, para. F331.1.
(6) Cool as rapidly as possible after the hold period.
(7) Postweld heat treatment is neither required nor prohibited, but any heat treatment applied shall be as required in the material specification.
(8) Cooling rate to 649 ˚C (1,200 ˚F) shall be less than 56˚C (100˚F)/hr, thereafter, the cooling rate shall be fast enough to prevent embrittlement.
(9) Cooling rate shall be > 167˚C (300˚F)/hr to 316˚C(600˚F)
(10) Heat treat within 14 days after welding. Hold time shall be increased by 1/2 hr for each 25mm (1 in.) over 25mm thickness. Cool to 427˚C (800˚F) at a rate ≤ 278˚C
(500˚F)/hr, per 25mm (1 in.) nominal thickness, 278˚C (500˚F)/hr max. Cool in still air from 427˚C(800˚F)
Page 20 of 24
Attachment # E - PWHT Requirement as per Piping Class
Piping Holding Time Brinell
PWHT Requirement as Thickness Metal Temp
Sl No Class Licensor Requirement Pipe Material 0
(HR) Hadrness
Piping Class (mm) Range ( C)
Number Minimum (BHN)
1 11011K ASTM A106-B/ASTM A672-C65 CL22 As per ASME B31.3 >20MM 593-649 1 200
2 11011KT ASTM A106-B/ASTM A672-C65 CL22 As per ASME B31.3 >20MM 593-649 1 200
3 11021K ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
9 11055KT ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
14 11372K ASTM A106-B PWHT ALL 593-649 1 200
15 11372KT ASTM A106-B/ASTM A672-C65 CL22 PWHT ALL 593-649 1 200
18 11374K ASTM A106-B/ASTM A672-C65 CL22 PWHT ALL 593-649 1 200
19 11374KT ASTM A106-B/ASTM A672-C65 CL22 PWHT ALL 593-649 1 200
20 115101 ASTM A106-B/ASTM A672-C65 CL22 As per ASME B31.3 >20MM 593-649 1 200
21 115103 ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
22 115103T ASTM A106-B/ASTM A672-C65 CL22 As per ASME B31.3 >20MM 593-649 1 200
25 115106 ASTM A333-6 As per ASME B31.3 >20MM 593-649 1 200
27 115110T ASTM A106-B PWHT ALL 593-649 1 200
34 115141T ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
35 115146 ASTM A106-B/ASTM A672-C65 CL22 PWHT ALL 593-649 1 200
36 115146T ASTM A106-B/ASTM A672-C65 CL22 PWHT ALL 593-649 1 200
38 115155 ASTM A106-B/ASTM A672-C65 CL22 PWHT ALL 593-649 1 200
39 115155T ASTM A106-B/ASTM A672-C65 CL22 PWHT ALL 593-649 1 200
41 115156T ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200

Page 21 of 24
(HR) Hadrness
ASTM A106-B
42 115160 As per ASME B31.3 >20MM 593-649 1 200
/ASTM A672-C65 CL22 Cement Lined
43 115161 Licensor-13 (Axens) ASTM A106-B PWHT ALL 593-649 1 200
44 115161T ASTM A106-B PWHT ALL 593-649 1 200
46 115164T Licensor-12 (Axens) ASTM A106-B PWHT ALL 593-649 1 200
49 115169 ASTM A106-B PWHT ALL 593-649 1 200
51 115201 API 5L-B Cement Lined/ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
54 125118 ASTM A335-P5/ASTM A691-5Cr CL22 PWHT ALL 704-729 2 241
56 125119T ASTM A335-P9/ASTM A691-9Cr CL22 PWHT ALL 704-729 2 241
60 151071K ASTM A106-B/ASTM A333-6 As per ASME B31.3 >20MM 593-649 1 200
61 1525104 ASTM A335-P11 PWHT ALL 704-729 2 225
API 5L-B (galvanised)

62 18011K As per ASME B31.3 >20MM 593-649 1 200
3" and above: Hot dip galv. at site
63 2515153 ASTM A106-B/ASTM A333-6 PWHT ALL 593-649 1 200
75 31372K ASTM A106-B PWHT ALL 593-649 1 200
76 31372KT ASTM A106-B PWHT ALL 593-649 1 200
77 31374K ASTM A106-B PWHT ALL 593-649 1 200
78 31374KT ASTM A106-B PWHT ALL 593-649 1 200
ASTM A106-B/ASTM A672-C65 CL22/ASTM

81 315104T As per ASME B31.3 >20MM 593-649 1 200
A671-CC65 CL22
Page 22 of 24
(HR) Hadrness
87 315155T ASTM A106-B PWHT ALL 593-649 1 200
88 315160 As per ASME B31.3 >20MM 593-649 1 200

ASTM A106-B Cement Lined
89 315163 ASTM A106-B PWHT ALL 593-649 1 200
90 315163T ASTM A106-B PWHT ALL 593-649 1 200
100 32021K ASTM A335-P11/ A691-1.25Cr CL22 As per ASME B31.3 >13MM 704-729 2 225
101 325104 ASTM A335-P11/ A691-1.25Cr CL22 PWHT ALL 704-729 2 225
110 61372KT ASTM A106-B/ASTM A333-6 PWHT ALL 593-649 1 200
111 61374K ASTM A106-B PWHT ALL 593-649 1 200
112 61374KT ASTM A106-B/ASTM A333-6 PWHT ALL 593-649 1 200
115 62021K ASTM A335-P11 As per ASME B31.3 >13MM 704-729 2 225
122 925104 ASTM A335-P11 PWHT ALL 704-729 2 225
Page 23 of 24
(HR) Hadrness
125 925132 ASTM A335-P11 As per ASME B31.3 >13MM 704-729 2 225
126 A11 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
127 A31 Licensor-7 (KNPC Old) ASTM A333-6 As per ASME B31.3 >20MM 593-649 1 200
128 A5 Licensor-7 (KNPC Old) ASTM A106-B/API 5L-B As per ASME B31.3 >20MM 593-649 1 200
129 A5V Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
133 AB4 Licensor-7 (KNPC Old) As per ASME B31.3 >20MM 593-649 1 200
ASTM A106-B
134 AD3 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
135 AD5 Licensor-7 (KNPC Old) ASTM A106-B All welds and HAZ per KNPC ENG STD 50D11 irrespectiveALL
of thickness.593-649 1 200
136 AD6 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
137 AE1 Licensor-7 (KNPC Old) ASTM A335-P5/ASTM A691-5Cr CL42 Per KNPC ENG STD 50D11 ALL 704-729 2 241
138 AE3 Licensor-7 (KNPC Old) ASTM A335-P5 Per KNPC ENG STD 50D11 ALL 704-729 2 241
139 AG1 Licensor-7 (KNPC Old) ASTM A335-P9/ASTM A691-9Cr CL42 Per KNPC ENG STD 50D11 ALL 704-729 2 241
140 AH3 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
141 AY2 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
142 B1A1 Licensor-8 (UOP) ASTM A106-B/ASTM A672-C65 CL22 As per ASME B31.3 >20MM 593-649 1 200
143 B2A1 Licensor-8 (UOP) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
144 C1 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
148 CD3 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
149 CD6 Licensor-7 (KNPC Old) ASTM A106-B All welds and HAZ per KNPC ENG STD 50D11 irrespectiveALL
of thickness.593-649 1 200
150 CD9 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
151 CE1 Licensor-7 (KNPC Old) ASTM A335-P5/ASTM A691-5Cr CL42 Per KNPC ENG STD 50D11 ALL 704-729 2 241
152 CE2 Licensor-7 (KNPC Old) ASTM A335-P5 Per KNPC ENG STD 50D11 ALL 704-729 2 241
153 CH1 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
154 F1 Licensor-7 (KNPC Old) ASTM A106-B For Thickness over 3/4"as per KNPC ENG STD
>19.05MM
50D11 593-649 1 200
155 F3 Licensor-7 (KNPC Old) ASTM A106-B For Thickness over 3/4"as per KNPC ENG STD
>19.05MM
50D11 593-649 1 200
156 GR11 Licensor-7 (KNPC Old) ASTM A106-B For Thickness over 3/4"as per KNPC ENG STD
>19.05MM
50D11 593-649 1 200
157 L1 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
158 L2 Licensor-7 (KNPC Old) ASTM A106-B Galvanized As per ASME B31.3 >20MM 593-649 1 200
159 L3 Licensor-7 (KNPC Old) ASTM A106-B Cement Lined As per ASME B31.3 >20MM 593-649 1 200
/ASTM A672-C65 CL22 Cement Lined
160 S1 Licensor-7 (KNPC Old) ASTM A106-B As per ASME B31.3 >20MM 593-649 1 200
161 115101T CS As per ASME B31.3 >20MM 593-649 1 200
162 115158 CS PWHT ALL 593-649 1 200
Page 24 of 24
(HR) Hadrness
165 315129 CS PWHT ALL 593-649 1 200
166 315144 CS As per ASME B31.3 >20MM 593-649 1 200
167 315154T CS As per ASME B31.3 >20MM 593-649 1 200
168 91031K CS As per ASME B31.3 >20MM 593-649 1 200
169 A6 Licensor-7 (KNPC Old) CS As per ASME B31.3 >20MM 593-649 1 200
170 C2 Licensor-7 (KNPC Old) CS As per ASME B31.3 >20MM 593-649 1 200
171 LPE Licensor-9 (Kellogg) CS (Galvanized) As per ASME B31.3 >20MM 593-649 1 200

PWHT Procedure F3 - Code - 1

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Page 1 of 24

Subcontractor’s Name : AL-KULAIB INTERNATIONAL

Subcontractor No. : 0-6798-Z-3160-002

Project Name : KNPC Clean Fuel Project

Subcontractor Work Package : SMP Construction Work

DOCUMENT TITLE : Post Weld Heat Treatment Procedure (PWHT)

Subcontractor’s Doc. No. : VS3160-002-A-2016

KNPC CLEAN FUELS PROJECT

2. Approved / Reviewed - Minor Comments U C JI

PWHT Line Class Table revised based on approved

PROJECT: Document ID Code:

Construction of SKEC Packages

Post Weld Heat Treatment Procedure

F3 16-Feb-17 Issued for Final Sanal Sajo H C Jung

F2 08-Oct-16 Issued for Final Sanal Sajo H C Jung

F1 11-Aug-16 Issued for Final Sanal Sajo H C Jung

A3 25-Jul-2016 Issued for Company Review Sanal Sajo H C Jung

A2 16-Jun-2016 Issued for Company Review Sanal Sajo H C Jung

A1 11-Apr-2016 Issued for Company Review Sanal Sajo H C Jung

O1 13-Feb-2016 Issued for JGSK Comments Sanal Sajo H C Jung

REV DATE DESCRIPTION PREPARED BY CHECKED BY APPROVED BY

PROJECT: Document ID Code:

Rev. No. Page/Section Description

A1 Issued for Review

A2 Issued for Review

A3 Issued for Review

F1 Issued for Construction

Sub-Contractor NO. Job Code. Document No. REV.

0-6798-Z-3160-002 (CFP-MAA) 0-6798-20-0000 VS3160-002-A-2016 F3

PROJECT: Document ID Code:

SECTION TITLE PAGE

6.0 REFERNCE ATTACHMENTS 15-22

ATTACHMENT-A - REPORT FORM

PROJECT: Document ID Code:

3.1 ASME Sec V - Non-Destructive Examination

3.3 VS3160-002-A-2017 - Hardness Test Procedure

3.7 ASME B31.4 - Pipeline Transportation system for

3.11 Shell DEP 30.10.02.17-Gen - Wet H2s Requirements For Downstream

3.13 KNPC Eng. Std. 50D11 - Standard Specification Piping Welding

PROJECT: Document ID Code:

 50KVA 6 Point Globe heat treatment transformer

Personnel involved in heat treatment operation shall be experienced and

PROJECT: Document ID Code:

5.3 HEATING ARRANGEMENT

5.3.1 LOCAL HEAT TREATMENT(PWHT)

Heating elements shall be thoroughly examined before use in-order to ensure

PROJECT: Document ID Code:

Each circuit or heating element shall be controlled either by a contactor or

i) A combination of set point temperature controller and a percentage

5.3.2 PRE HEATING

When Pre Heating is applied by electric resistance method, a circumferential

The weld shall be completed before the preheat temperature is lowered;

Preheating shall be restored specified temperature and maintained for 30

Type K thermocouple wires as per BS 4937 part -4 / BS EN 60584 having -

PROJECT: Document ID Code:

shall be adjusted accordingly. The wires shall be attached to the heating

Thermocouple shall be positioned on the OD of the weld OR on the HAZ as

Batch certificates for thermocouple wire from the manufacturer shall be

Sufficient number of thermocouples shall be provided for accuracy of