基于美国ASME标准的渗透检测规程

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CONTENTS

1.Scope

2. Qualification of NDE Personnel

3.Procedure

4.Materials

5. Surface Preparation

6. Examination

7.Interpretation

8.Reexamination for Repaired Area and Nonconformity Control

9.Post Cleaning

10. Report

LIQUID PENETRANT EXAMINATION INSTRUCTION

LIQUID PENETRANT EXAMINATION REPORT.

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1.Scope

1.1 This procedure is applied to a color contrast solvent removable penetrant examination technique between the temperature range of 60℉to 125℉(16℃to 52℃).

1.2 This procedure is applied to welds and nonporous materials of ASME Code pressure vessels fabricated according to ASME Code Section ⅧDivision 1

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中国无损检测论坛

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2. Qualification of NDE Personnel

Personnel performing liquid penetrant examination shall be qualified and certified in accordance with the requirements of HT’s Written Practice for NDE Personnel Training, Examination, Qualification and Certification based on the require ments of “SNT-TC-1A(Current Code accepted edition).

3.Procedure

The procedure shall be supplemented by the LIQUID PENETRANT EXAMINATION INSTRUCTION which shall be issued to every product to be examined and in which more detail parameters are specified. The Instruction shall be prepared by level Ⅱ, approved by level ⅢNDE examiner,

4. Materials

4.1 A group of penetrant materials shall include preplanning agent, penetrant, cleaning agent or remover, developer, It shall be selected from Table 1 (solvent removable type). Intermixing of penetrant materials from different families and different manufacturers is not permitted.

4.2 When examination nickel alloys, austenitic stainless steels and titanium, all liquid penetrant materials certifications shall be obtained. The certification shall include the penetrant manufacturer’s batch number, the test results and manufacture date. These records shall be kept in file in the NDE Room.

4.3 When examining nickel base alloys, all materials shall be analyzed individually for sulfur content. When examining austenitic stainless steel or titanium, all materials shall be analyzed individually for chlorine and fluorine content. The acceptance standard (for sulfur, chlorine and fluorine content) shall be in accordance with requirements of Article 6 Paragraph T-641 of ASME Code Section V.

4.4 All penetrant materials, which have been contaminated, deteriorated and ineffective shall not be used.

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4.5 The cotton cloth, which shall be a clean and lint-free material, shall be used for excess penetrant removal.

4.6 When natural light is not enough for examination, adequate illumination is required to ensure adequate sensitivity during the examination and evaluation of indications.

Table 1

Manufacturer

Type of Penetrant Materials Preplanning

Agents

Penetrates Solvent

Remover

Developers

(Nonaqueous)

Shanghai

Res.Insti.Of

Materials

Tonglu NDT

Mater.Plant

DPT-3-1 DPT-3-2 DPT-3-1 DPT-3-3

Shanghai

Fengxian

No.2 Tool

Works

HD--BX HD--RS HD—BX HD—EV

4.7 If the penetrates are applied by brushing, the clean soft brush shall be used.

5. Surface Preparation

5.1 Prior to each liquid penetrant examination, the surface to be examined and all adjacent areas within at least 1in.shall berry and free of all dirt, grease, lint, scale, welding flux, weld spatter, paint, oil, and other extraneous matter that could obscure surface openings or otherwise interfere with the examination.

5.2 In general, satisfactory results may be obtained when the surface of the part is in the as-welded, as-rolled, as-cast, or as-forged condition. Surface preparation by grinding, machining, or other methods may be necessary where surface irregularities could mask indications of unacceptable discontinuities. Sand blasting is prohibited as it may decrease the effectiveness of the penetrant examination.

6.Examination

Level ⅡNDE examiner shall perform liquid penetrant examination in accordance with following process and the requirements of the Instruction, and