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API 577 Notlari

This document discusses NDE examiner certification, procedure qualification records, and assignment of identification numbers to base metals, filler metals, and deposited weld metals. It also addresses welding issues for refineries and petrochemical plants, including hot tapping and in-service welding. Low-hydrogen electrodes should be used for these operations to prevent hydrogen cracking, and extra-low-hydrogen consumables for carbon steels over 0.43% or in constrained areas. Liquid flow rates during welding should be between 1.3-4 ft/sec to prevent hard zones and cracking.

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Erdi Erdogan
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93 views2 pages

API 577 Notlari

This document discusses NDE examiner certification, procedure qualification records, and assignment of identification numbers to base metals, filler metals, and deposited weld metals. It also addresses welding issues for refineries and petrochemical plants, including hot tapping and in-service welding. Low-hydrogen electrodes should be used for these operations to prevent hydrogen cracking, and extra-low-hydrogen consumables for carbon steels over 0.43% or in constrained areas. Liquid flow rates during welding should be between 1.3-4 ft/sec to prevent hard zones and cracking.

Uploaded by

Erdi Erdogan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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NDE EXAMINER CERTIFICATION

a. ASNT SNT-TC-1A
b. ANSI/ASNT CP-189

PROCEDURE QUALIFICATION RECORD

tension test to determine the ultimate strength of a groove weld, guided bend tests to determine
the degree of soundness and ductility of a Groove weld, notch toughness testing when toughness
requirements are imposed, and hardness measurements when hardness restrictions are defined.

P-NUMBER ASSIGNMENT TO BASE METALS


F-NUMBER ASSIGNMENT TO FILLER METALS
A-NUMBER ASSIGNMENT TO COMPOSITION OF DEPOSITED WELD METAL

REFINERY AND PETROCHEMICAL PLANT WELDING ISSUES


HOT TAPPING AND IN-SERVICE WELDING
Electrode Considerations
Hot tap and in-service welding operations should be carried out only with low-hydrogen
consumables and electrodes (e.g., E7016, E7018 and E7048). Extra-low-hydrogen consumables such
as Exxxx-H4 should be used for welding carbon steels with CE greater than 0.43% or where there is
potential for hydrogen assisted cracking (HAC) such as cold worked pieces, high strength, and highly
constrained areas. Cellulosic type electrodes (e.g., E6010, E6011 or E7010) may be used for root and
hot passes.

Flow Rates
Liquid flow rates in piping shall be between 1.3 ft/ sec. and 4.0 ft/sec. (0.4 m/sec. and 1.3 m/sec.).
Faster liquid flow rates may cool the weld area too quickly and thereby cause hard zones that are
susceptible to weld cracking or low toughness properties in the weldment.

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