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Description

The Company with the Strength of Steel

PROCEDURE FOR POST WELD HEAT TREATMENT OF STORAGE TANKS

PROCEDURE NO

Issued for Client Approval

Revision Description

Ibrahim Prepare By Welding Engineer

Ramadan Reviewed By: QC Superintend

Nageeb Approved By: QC Manager

The Company with the Strength of Steel

POST WELD HEAT TREATMENT (STORAGE TANKS)

Procedure :7-8-00/JZ-777 Rev / Date : A / 26

TABLE OF CONTENTS SECTION

Cover Page

Table of Content

References…………………

General Requirements

Heating System……………

Temperature Control…

Thermocouples & Thermocouple Extension…

Thermocouple Positions………………………

Temperature Record……………………………

Procedure………………………………………

Documentation & Records…………………

The Company with the Strength of Steel

POST WELD HEAT TREATMENT (STORAGE TANKS)

Procedure :7-8-00/JZ-777 Rev / Date : A / 26

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

References

API 650 11th Edition (2011)

SAES-W-017

Applicable Welding Package (WPS,

General Requirements

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

All PWHT chart records shall be submitted to Welding Engineer for review and approval

Suitably trained Presonnel shall be employed for operation of PWHT Furnace

Heating System

The Specification of PWHT Furnace as follows  Furance type : Transport loading type (W(6) X H(7

 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

POST WELD HEAT TREATMENT (STORAGE TANKS)

Procedure :7-8-00/JZ-777 Rev / Date : A / 26

Temperature Control

There are eight Local Control Panel in the Furnce for the burner control

The Local Control Panel to drive the burner control unit as fundamental from air pressure control ignition,

The Burners shall be adjusted manually,

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

The location of thermocouples describes in Section 7 of this procedure,

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

All extension cables,

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 Position

Thermocouple sahll be located on the nozzle to shell / pad assembly surface to ensure that all positions are properly and uniformly heated

The thermocouple locations shall include: a- The thinnest major component b- The thickest member

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

The Company with the Strength of Steel

POST WELD HEAT TREATMENT (STORAGE TANKS)

Procedure

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

API 620 Storge tanks

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)

Procedure :7-8-00/JZ-777 Rev / Date : A / 26

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

The furnace shall be of such design as to prevent direct impingement of the flame on the material

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

At temperatures of 600°F (315°C) and below,

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

Documentation & Records

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