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PROCEDURE FOR POST WELD HEAT TREATMENT OF STORAGE TANKS
PROCEDURE NO
Issued for Client Approval
Revision Description
Nageeb Approved By: QC Manager
POST WELD HEAT TREATMENT (STORAGE TANKS)
TABLE OF CONTENTS SECTION
Cover Page
Temperature Control…
Thermocouples & Thermocouple Extension…
Procedure………………………………………
Documentation & Records…………………
This procedure describes all the requirements for Post Weld Heat Treatment of shell / re-pad and cleanout door assembly of Storage tanks in a furnace as per API 650 & API 620
Before applying the detailed requirements,
satisfactory weld procedure qualifications of the procedures to be used shall be performed in accordance with all the essentail variables of ASME section IX including conditions of postweld heat treatment or lack of postweld heat treatment
Prior to the start of PWHT,
components shall be checked to ensure that all restraints are removed,
the component is free to expand and contract and suitable and sufficient support are used
All machined surface,
Shall be protected from oxidation during the heat treatment by coating with de-oxaluminite or other suitable material
Maximum Operation Temperature : 750 C (Normal : 700 C) Coumbustion method : Diesel Burner (Ignition LPG) Ignition system : LPG high voltage discahrge ignited by the Flame Main Fuel : Diesel Burner Quantity : 8 set Burner Capacity : 1000000 Kcal/h/set Electricity : 380V 3P 60Hz Blower : Motor : 11KW 3P x 8 set Air Pressure & Air Flow : 700mmAq & 35CMM Local control Panel & Main Control Panel
The Company with the Strength of Steel
Procedure :7-8-00/JZ-777 Rev / Date : A / 26
The Local Control Panel to drive the burner control unit as fundamental from air pressure control ignition,
by continous reference to the temperature recording instrument,
adjusting fuel and airflow in a manner such as to ensure that parameters and constraints of the specification are fully met,
to achieve a heating balance throughout the assembly
shall be determined so as to provide a good indication of the overall distribution of heat throughout the assembly,
any discrepancy shall be investigated
The actual temperature range for the soak period,
shall not have a spread of more than 40°C
Thermocouples & Thermocouple Extension
Thermocouples shall be Type K(Chromel-Alumel) or Type J(iron-Constantan)
Thermocouples shall be attached to the workpiece by the direct wire capacitance discharge welding method
and jumper cables in the measurement or control circuits shall be the specified thermocouple wire or the matching extension wire
The thermocouple to compensation lead connection shall be a minimum of 0
and that the temperature at the junction is to be in the range of 0-80°C
Thermocouple sahll be located on the nozzle to shell / pad assembly surface to ensure that all positions are properly and uniformly heated
Sufficient thermocouples must be used to ensure that the welds and heat affected zones achieve the uniform temperatures
Temperature Recording
Thermocouples and a calibrated temperature chart recorder shall be used to provide an accurate and legible record of all PWHTs
All charts shall be marked with the date and sufficient information to uniquely identify the vessel (orjoint/component for localized PWHT) being heat treated
Multipoint chart recorders shall clearly differentiate/identify each channel/point by use of different colored inks or automatic number stamping
Temperature recorders shall be calibrated every three months and a current calibration sticker shall be maintained on the recorder
The calibration frequency may be extended to 12 months with the approval of Saudi Aramco Inspection if the documented calibration checks for that particular recorder demonstrate acceptable accuracy for a suitable period
API 650 Storage Tanks
Procedure :7-8-00/JZ-777 Rev / Date : A / 26
The stress relief shall be carried out within a temperature range of 600°C
The assembly shall include the bottom reinforcing plate (or annular plate) and the flange-to-neck weld
all opening connections NPS 12 or larger in nominal diame-ter in a shell plate or thickened insert plate more than 25 mm (1 in
) thick shall be prefabricated into the shell plate or thickened insert plate,
and the prefabricated assembly shall be thermally stress-relieved within a temperature range of 600°C
) of thickness prior to installation
The stress-relieving requirements need not include the flange-to-neck welds or other nozzle-neck and manholeneck attachments,
provided the following conditions are fulfilled: a) The welds are outside the reinforcement b) The throat dimension of a fillet weld in a slip-on flange does not exceed 16 mm (5/8in
or the butt joint of a welding neck flange does not exceed 19 mm (3/4 in
If the material is preheated to a minimum temperature of 90°C (200°F) during welding,
the weld limits of 16 mm (5/8in
) may be increased to 32 mm and 40 mm (1 1/4 in
all opening connections requiring rein forcement in a shell plate or thickened insert plate more than 13 mm (1/2in
) thick shall be prefabricated into the sh ell plate or thickened insert plate,
and the prefabricated assembly shall be thermally stress relieved within a temperature range of 600°C – 650°C (1100°F – 1200°F) for 1 hour per 25 mm (1 in
) of thickness prior to installation
at any nozzle or other welded attachment and nozzle necks whose thickness at any welded joint therein exceeds (D + 50) / 120 shall be thermally stress relieved after welding
Thickness of compression rings are not considered in the determination of thermal stress relief requirements
When thermal stress relief cannot be applied to welded assemblies of these parts after erection,
particularly around openings and support attachments,
shall be made in the shop and shall be thermally stress relieved before shipment
of metal thickness (maximum metal thickness of the tank wall plates affected)
Table 1
General
of the wall plate being heated,
but in no case shall it be more than 400 °F/hr (222°C/hr)
The Company with the Strength of Steel
POST WELD HEAT TREATMENT (STORAGE TANKS)
the temperature throughout the portion of the tank being heated shall not vary more than 250°F (140°C) within any 15-ft (4
the furnace atmosphere shall be so controlled as to avoid excessive oxidation of the surface of the material being treated
cooling shall be done in a closed furnace or cooling chamber at a rate not greater than 500°F (280°C) per hour divided by the maximum metal thickness,
in inches of the plates affected
in no case shall the rate be more than 500°F (280°C) per hour
the material may be cooled in still air
However,
in all cases consideration of closed chambers and complex structures may indicate reduced rates of heating and cooling to avoid structural damage due to excessive thermal gradients
The documentation information will comprise of the following: Approval of relevant heat treatment procedure and / or specification,
Heat Treatment Data sheet (Deatails of thermocouple layout & traceability to the recording chart)
fully identified and referenced
The chart shall also identify the heat treatment specification,
Recorder Test Certificate and Thermocouples conformation