The Failure Analysis on The Inlet Pipe of Propadiene Reactor The Failure Analysis on The Inlet Pipe of Propadiene Reactor of Low Temperature Unit in Naphtha Cracking Planof Low Temperature Unit in Naphtha Cracking Plan

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1

R-1401A2011825(U.T.)(P.T.)

SEMEDX

(Corrosion Under Insulation, CUI)(Chloride Stress Corrosion Cracking, Cl-_SCC)CUI_

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3

R-1401A2011

8251.2. (U.T.)(P.T.)(V.T.)

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(P.T.)(V.T.)(SEM, Scanning Electron Microscopy)(EDX, Energy-dispersive Spectrometer)

1.R1401A

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3.P.T.

2.

R1401A(P.T.)R1401B/C/S

R1401B/S

4.

7

:SEM

5.(Transgranular Crack)

8

:SEM

6.

97.SS 304

:SEM

10.8._

109.

:SEM

11._

11

:EDX

11.EDX

(Corrosion Under Insulation, CUI)(Chloride Stress Corrosion Cracking,Cl-_SCC)

300eg. SS304/SS316CUI-4~175100CUI (Pitting)60200

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I,eg. S.S.304IIeg. IIIS.S.304EDX15~30ppm(g/g)ASTM _C79310ppm

R1401_A37400100CUIR1401_A/B/C/SR1401A/B/S R1401_CP.T.R1401_CCUI_

R1401A(Corrosion Under Insulation, CUI)(Chloride Stress Corrosion Cracking, Cl-_SCC)

CUI_

1. Standard Specification for Thermal Insulation for Use in Contactwith Austenitic Stainless Steel, ASTM_C795_08.

2. Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless ,ASTM_C692_08.

3. Chemical Analysis of Thermal Insulation Materials for LeachableChloride, Fluoride, Silicate, and Sodium Ions, ASTM_C871_11.

4. Standard Practice Control of Corrosion Under Thermal Insulation and Fireproofing MaterialsA Systems Approach , NACE SP0198_2010.

5. Application of Aluminium Foil Under Insulation for Stainless Steel Equipment and Piping Shell _Engineering Guides and General Specifications _19 GS-51.

6.

!Thank You for Your Attention

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Q&AQ:RT(defect)?A:ASMEUW-51

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a. t 3/4(19.05): 1/4 (6.35 )b. 3/4 (19.05) t9/4 (57.15): t/3c. t 9/4 (57.15): 3/4 (19.05)