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    Final SOP For Passivation

    Uploaded by

    Bhaskar Kolichelima
    This document outlines the passivation procedure for stainless steel tanks and pipelines for a client. It describes initially cleaning the surfaces with water to remove welding residues. It then specifies circulating a 5% nitric acid/citric acid solution for 60 minutes to passivate the surfaces. Finally it describes flushing the surfaces with water until the conductivity is below 1.3 microsiemens per centimeter and pH is between 5-7, ending the cleaning cycle. Water quality parameters like pH and conductivity are to be checked and documented during flushing.

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    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd

    Final SOP For Passivation

    Uploaded by

    Bhaskar Kolichelima
    115 views3 pages
    This document outlines the passivation procedure for stainless steel tanks and pipelines for a client. It describes initially cleaning the surfaces with water to remove welding residues. It then specifies circulating a 5% nitric acid/citric acid solution for 60 minutes to passivate the surfaces. Finally it describes flushing the surfaces with water until the conductivity is below 1.3 microsiemens per centimeter and pH is between 5-7, ending the cleaning cycle. Water quality parameters like pH and conductivity are to be checked and documented during flushing.

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    Final SOP for Passivation

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    This document outlines the passivation procedure for stainless steel tanks and pipelines for a client. It describes initially cleaning the surfaces with water to remove welding residues. It then specifies circulating a 5% nitric acid/citric acid solution for 60 minutes to passivate the surfaces. Finally it describes flushing the surfaces with water until the conductivity is below 1.3 microsiemens per centimeter and pH is between 5-7, ending the cleaning cycle. Water quality parameters like pH and conductivity are to be checked and documented during flushing.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    115 views3 pages

    Final SOP For Passivation

    Uploaded by

    Bhaskar Kolichelima
    This document outlines the passivation procedure for stainless steel tanks and pipelines for a client. It describes initially cleaning the surfaces with water to remove welding residues. It then specifies circulating a 5% nitric acid/citric acid solution for 60 minutes to passivate the surfaces. Finally it describes flushing the surfaces with water until the conductivity is below 1.3 microsiemens per centimeter and pH is between 5-7, ending the cleaning cycle. Water quality parameters like pH and conductivity are to be checked and documented during flushing.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    of 3

    DEVI ENGINEERING

    STANDARD OPERATING PROCEDURE


    Client: M/s. BHARAT BIOTECH INTERNATIONAL LTD
    PASSIVATION PROCEDURE FOR SS TANK AND PIPELINES
    Page 2 of 2

    PASSIVATION PROCEDURE

    1.0 OBJECTIVE

    To establish a Standard Operating Procedure for Passivation.

    2.0 SCOPE

    This shall be applicable for Passivation of Tank & Piping.

    3.0 APLLICABLE CODES AND STANDARDS.

    ASTM A 967- 01, Chemical Passivation Treatments for stainless steel parts.
    ASTM A 380 – 99, Standard practice for Cleaning, Descaling, and Passivation of stainless steel
    parts, equipment and systems.

    4.0 RESPONSIBILITY

    4.1 Executing : Devi Engineering.


    4.2 Monitoring : Client

    5.0 PROCEDURE

    5.1 GENERAL
    i. These specifications have to meet specific requirement for cleaning and passivating all
    stainless steel or alloys containing more than 12% Cr.
    ii. All welding flux and weld spatter to be removed by initial cleaning.

    5.2 INITIAL CLEANING


    i. Take 25-50% by volume of water in the tank. (Water quality –chlorine content shall be
    less than 5ppm), then circulate the water for 30 minutes.
    ii. Drain the water from the tank by opening the drain valve and system by lowest point
    valves.

    5.3 PASSIVATION
    i. The composition of the passivating Bath shall be as follows
     5% concentrated Nitric acid/Citric acid.
     95% water with not more than 1-ppm chloride
     1.5 times the hold up volume of the distribution piping and 1.5 times the hold up
    Volume of the equipment in the loop (Except tanks) or 25% volume of the tank.
    Whichever is higher
    ii. Start the pump to circulate the 5% nitric acid / citric acid solution for 60 Minutes at
    ambient temperature
    iii. Stop the pump after circulation.
    DEVI ENGINEERING
    STANDARD OPERATING PROCEDURE
    Client: M/s. BHARAT BIOTECH INTERNATIONAL LTD
    PASSIVATION PROCEDURE FOR SS TANK AND PIPELINES
    Page 2 of 2

    iv. Drain the solution from the tank and pipelines.

    5.4 FINAL CLEANING


    i. Take 25-50% by volume of water in the tank. (water quality:- chlorine content shall be less
    than 5ppm). Circulate the water for the period of 30 minute.
    ii. Drain the water of tank by opening the drain valve and system by lowest point valves.
    iii. Repeat the above procedure ( i and ii ) till we observe the conductivity 1.3 µs/cm and pH
    should be 5-7.
    iv. This will end the cleaning cycle.

    6.0 WATER QUALITY TEST DURING FLUSHING


     Check conductivity in return line water.
     pH of the water should be between 5 to 7. Same pH to be maintain for feed and drain
    water.

    Name Department Signature Date


    Prepared By
    Checked
    Approved By
    DEVI ENGINEERING
    STANDARD OPERATING PROCEDURE
    Client: M/s. BHARAT BIOTECH INTERNATIONAL LTD
    PASSIVATION PROCEDURE FOR SS TANK AND PIPELINES
    Page 2 of 2

    PASSIVATON REPORT

    SYSTEM

    A. INITIAL FLUSHING

    1. Quantity of water takes:


    2. Initial flushing started at:
    3. Initial flushing ended at:

    B. PASSIVATION

    1. Quantity of water taken:


    2. Quantity of Nitric acid/Citric acid added:
    3. Concentration of solution:
    4. Recirculation started at:
    5. Recirculation ended at:
    6. Temperature during recirculation:
    7. Duration of recirculation:

    C. FINAL FLUSHING

    1. Quantity of water taken:


    2. Final flushing started at:
    3. Final flushing ended at:
    4. Conductivity / pH at supply line:
    5. Acceptance limit for pH / Conductivity: 5-7 / < 1.3µS/Cm

    Name Designation Signature Date


    Prepared By
    Checked

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