ユニークなAPI-571日本語的中対策 & 合格スムーズAPI-571日本語認定 | 信頼できるAPI-571テスト問題集ユーザーに多くの不必要なトラブルを保存するために、オンライン学習プラットフォームのAPI-571研究質問の研究と開発を完了しました。ユーザーはダウンロードしてインストールする必要はなく、デジタルデバイスにブラウザーがあれば必要です。 API-571テストガイドのオンライン操作。この種の学習方法は、特にAPI-571認定を取得するペースが速いときに、ユーザーにとって非常に便利です。 API-571トレーニング資料を使用すると、API-571学習資料のすべての操作を完全に適用できます。 API Corrosion and Materials Professional 認定 API-571 試験問題 (Q99-Q104):質問 # 99
Naphthenic acid corrosion is a form of high temperature corrosion that occurs primarily in crude and vacuum units and downstream units that process certain fractions that contain naphthenic acid. Which of the following materials is susceptible to naphthenic acid corrosion?
A. Carbon steel
B. All of the above
C. 300 Series SS
D. 400 Series SS
正解:B
質問 # 100
Stainless steel cyclones, piping ductwork and valves in high temperature FCC regeneration service are susceptible areas for _________.
A. Corrosion fatigue
B. Sigma phase
C. Brittle fracture
D. Cavitation
正解:B
質問 # 101
Boiler water condensate corrosion is caused primarily by:
A. High pH from water treatment problems
B. Dissolved iron oxides
C. Carbon dioxide and oxygen
D. Sodium sulfites or hydrazines
正解:C
解説:
According to API RP 571, in the section on Boiler Water Condensate Corrosion:
"The major contributors to condensate corrosion are dissolved CO# and O#. Carbon dioxide forms carbonic acid in the presence of water, lowering pH and causing generalized corrosion."
"Oxygen causes pitting and localized corrosion unless chemically treated." Thus, option B (Carbon dioxide and oxygen) is the primary root cause and the correct answer.
質問 # 102
With sulfuric acid corrosion, the presence of oxidizers can _______ the corrosion rate.
A. Increase
B. Decrease
C. Stabilize
D. Eliminate
正解:A
質問 # 103
Metal dusting is preceded by ________ and is characterized by rapid metal wastage.