GB/T 5777-2019[Including 2021XG1] Automated full peripheral ultrasonic testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of longitudinal and/or transverse imperfections (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

This Standard replaced GB/T 5777-2008 Seamless Steel Pipe and Testing Methods

for Ultrasonic Testing. Compared with GB/T 5777-2008, this Standard has the major

technical changes as follows:

--- Modify the standard name;

--- Modify the applicable scope; delete the electromagnetic sound detection method;

and add Lamb wave and phased array technical detection methods (see Clause

1 of this Edition; Clause 1 of 2008 Edition);

--- Add terms and definitions, and general requirements (see Clauses 3 and 4 of

this Edition);

--- Modify the contents of the detection method; and add Lamb wave detection

method (see Clause 5 of this Edition; Clause 4 of 2008 Edition);

--- Delete the contents of flaw detector (see 6.1 of 2008 Edition);

--- Modify the contents of the probe size (see 5.4 and 5.5 of this Edition; and 6.2 of

2008 Edition);

--- Delete the contents of the detection device, transmission device and sorting

devices (see 6.3, 6.4, 6.5 of 2008 Edition);

--- Modify the schematic diagram of the comparison sample tube (see Figures 1 and

2 of this Edition; Figures 1 and 2 and 2008 Edition);

--- Modify the requirements for the position of the groove (see 6.1.4 of this Edition;

and 5.4.2 of 2008 Edition);

--- Modify the acceptance level and identification (see Table 1 of this Edition; Table

1 of 2008 Edition);

--- Modify the requirements for the minimum depth of the groove (see Table 2 of this

Edition; Table 1 of 2008 Edition);

--- Modify the requirements for the width and length of the groove (see 6.3.1, 6.3.3

of this Edition; Table 1 of 2008 Edition);

--- Modify the requirements for the allowable deviation of the groove depth (see

1 Scope

This Standard specifies the requirements for automated full peripheral ultrasonic

transverse wave (generated by conventional or phased array technology) testing of

seamless and welded (except submerged arc-welded) steel tubes for the detection of

longitudinal and/or transverse imperfections.

Unless the purchaser specifically requires in the contract, the method used is generally

the detection of longitudinal imperfections.

When performing longitudinal imperfection detection, manufacturers can also decide

to use Lamb waves for detection.

For seamless pipes, the supplier and the purchaser can negotiate; the detection

principle of this Standard can be used to detect imperfections in other directions.

This Standard applies to ultrasonic testing of steel pipes with an outer diameter of no

less than 6mm, and a ratio of outer diameter to wall thickness of no less than 5. For

the detection of longitudinal imperfections of steel pipes with a ratio of outer diameter

to wall thickness less than 5, see Appendix A.

The testing of circular hollow parts can be performed with reference to this Standard,

and the manual ultrasonic testing can be performed with reference to this Standard.

2 Normative References

The following documents are essential to the application of this document. For the

dated documents, only the versions with the dates indicated are applicable to this

document; for the undated documents, only the latest version (including all the

amendments) are applicable to this document.

GB/T 9445 Non-Destructive Testing - Qualification and Certification of NDT

Personnel (GB/T 9445-2015, ISO 9712:2012, IDT)

GB/T 12604.1 Non-Destructive Testing - Terminology - Terms Used in Ultrasonic

Testing (GB/T 12604.1-2005, ISO 5577:2000, IDT)

ISO 11484 Steel Products - Employer's Qualification System for Non-Destructive

Testing (NDT) Personnel

3 Terms and Definitions

For the purpose of this document, the terms and definitions given in GB/T 12604.1 and

ISO 11484 and the following apply.