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Detection of Accelerated Corrosion with Handheld X-ray Fluorescence


Introduction

Crude oil generally contains only 10-40% the hydrocarbon constituents in gasoline. Refineries process crude oil using fluid catalytic cracking unit (FCCU) processes to convert high molecular weight hydrocarbons into smaller, more volatile compounds such as propene and butene. The latter, are converted using hydrofluoric acid (HF) as a catalyst to obtain liquid gasoline-sized hydrocarbons (alkylates). Alkylate is composed of a mixture of high octane branched chain paraffinic hydrocarbons (isoheptane and isooctane). Alkylate is a premium gasoline blending stock which provides antiknock properties and clean burning. These processes need to stay contained within carbon steel pipes that run throughout the refinery.

hf steel industrial clouds

X-Ray Fluorescence (XRF) accurately detects low levels of corrosion indicative elements such as Cr, Ni, and Cu in these aforementioned carbon steel pipes. Detection of these indicative residuals is critical for predicting accelerated corrosion within a petrochemical plant. In addition to testing for trace levels of corrosion indicative residuals, the petrochemical industry depends on handheld XRF analyzers for material inspection startups, shutdowns, general maintenance and trouble shooting. Managers cannot afford to depend on out-of-date and unreliable equipment, or fall behind the technology curve. The analytical capabilities of XRF continue to expand, while new features enable operators to be more effective and efficient.

Delta Handheld XRF in docking station

Application detail

DELTA handheld XRF analyzers provide highly accurate measurements of low levels of Cr, Ni and Cu in carbon steel are critical for predicting accelerated corrosion of components in HF Alkylation process units. It has been shown that if the sum of the residuals, Cr, Ni and Cu, exceeds 0.20%, the carbon steel components used in HF Alkylation processes will likely experience a preferentially accelerated corrosion rate. In general, a level between 0.15% and 0.20% of the sum of the three key residuals is deemed optimal, depending on the component, its use and location in the unit. As this is a decisive measurement for critical, low levels of Cr, Ni and Cu, it is necessary to grind the inspected component with an aluminum oxide disc to remove at least 0.004 inches of the surface prior to testing. Elbows, tees, reducers, couplings, flanges, welds, caps, plugs and other fittings, as well as pipe-scale can all be tested for the maximum allowable value of the sum of the three key residuals.

Model: DP-2000 (High Count Rate)
Measured values of residual elements Test time (mode): 120 Seconds B1 (Alloy Plus)
(Average of 5 repeat tests)
CrNiCu
Standard Cr Assay Cr +/- Ni Assay Ni +/- Cu Assay Cu +/-
ARMI 229A 0.015 0.01328 0.001838478 0.029 0.02858 0.002800143 0.014 0.00946 0.001555635
ARMI 28E 0.079 0.07768 0.002130748 0.145 0.14036 0.003903229 0.12 0.11628 0.00315841
ARMI 33D 0.139 0.13562 0.002545584 1.78 1.77232 0.011181715 0.072 0.07394 0.003526106
ARMI 35F 1.16 1.1579 0.005694567 0.047 0.04812 0.002988705 0.03 0.02768 0.002017611

Residual sums (Pass if <0.075%)
Results
Sample Sum of res. Inspection P/F
ARMI 229A 0.051 PASS
ARMI 28E 0.334 FAIL
ARMI 33D 1.982 FAIL
ARMI 35F 1.234 FAIL

trace cr xrf chart

Conclusion

The DELTA XRF analyzer is an essential tool for all businesses involved in the trade or use of metals alloys. In seconds, you can nondestructively measure over 25 elements. Turnings, shavings, rods, wires, small parts, components, sizeable materials and large structures can all be analyzed directly, non-destructively. Whether you check purity, chemistry, or grade ID for highest value, maximum recovery, quality, conformance, or maintenance and safety, the Olympus DELTA XRF analyzer will give you immediate answers to take preventative action.


Delta HandHeld XRF testing for alloys
Olympus IMS

이 애플리케이션에 사용되는 제품
DELTA 휴대용 XRF PMI 분석기는 합금 등급을 신속하고 정확하게 식별하고 금속 조성을 측정하기 위한 비파괴 합금 분석을 제공합니다. 단순 등급 ID에서 규격 품질 관리, 입고 자재 검사에서 최종 제품 검증에 이르기까지 수초 내로 PMI 검사 및 QA/QC 테스트를 수행합니다.
DELTA 엘리먼트는 고철 선별, 합금 성분 분석(PMI), 합금 QA/QC 및 귀금속 분석에 최적화된 비용 효율적인 휴대용 X선 형광(XRF) 분석기입니다.
실리콘 드리프트 검출기(SDD)와 4W 최적화된 X선 튜브를 결합한 DELTA 프로페셔널은 속도, LOD 및 원소 범위에서 뛰어난 성능을 제공합니다. 합금 및 광업에 대해 Mg 등을 분석합니다. DELTA 프로페셔널은 Olympus의 휴대용 XRF를 위한 최고의 가치를 지닌 솔루션입니다.
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