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Operator Zone – Oil & Gas Interview Questions

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Asked: June 8, 2025

What is Corrugated Plate Interceptor (CPI) ?

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A Corrugated Plate Interceptor (CPI) is a compact and efficient gravity-based oil–water–solid separator, commonly used in refineries, produced‑water systems, industrial facilities, and food processing plants. ...

A Corrugated Plate Interceptor (CPI) is a compact and efficient gravity-based oil–water–solid separatorcommonly used in refineriesindustrial facilitiesproduced‑water systems
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Asked: March 15, 2025

What is API Gravity?

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API Gravity is a measure of how heavy or light a petroleum liquid is compared to water. It is a scale developed by the American Petroleum Institute (API) to quantify the density of crude oil and other liquids. API Gravity ...

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Asked: May 12, 2025

How To calculate the capacity of a tank

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To calculate the capacity of a tank, you need to determine its volume based on its shape and dimensions. The capacity is typically expressed in liters, gallons, or cubic units. Here’s how to calculate it for common tank shapes: ### 1. ...

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Asked: September 19, 2024In: Safety Related

What is TLV,STEL,IDHL of H2S?

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Asked: March 26, 2025

What is End Point in Refining?

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What is End Point in Refining? ✅ End Point (EP) refers to the highest temperature at which the last fraction of a petroleum product evaporates during distillation. It is measured using ASTM D86 or similar distillation tests. Why is End Point ...

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Asked: March 26, 2025

1️⃣5️⃣ What is the significance of end-point control in CDU fractions?

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✔ Ensures each product meets quality specifications (e.g., diesel flash point, gasoline volatility).✔ Prevents overlapping boiling ranges, which affects product purity.✔ Solution: ...

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Asked: March 26, 2025

1️⃣4️⃣ What happens if the crude feed has high metals content?

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✔ Metals like nickel, vanadium, and iron cause fouling in heat exchangers.✔ Reduce catalyst life in downstream refining processes.✔ Solution: Use demetallization ...

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Asked: March 26, 2025

1️⃣3️⃣ What is the impact of steam injection in the CDU?

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✔ Reduces hydrocarbon partial pressure, allowing separation at lower temperatures.✔ Prevents coking & overheating in the heater and column.✔ Used ...

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Asked: March 26, 2025

1️⃣1️⃣ What is the effect of over-stripping in side strippers?

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✔ Removes too many light components, leading to flash point issues in kerosene & diesel.✔ Causes overloading of upper column trays, affecting separation efficiency.✔ ...

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Asked: March 26, 2025

What are the common problems in CDU operation and their solutions?

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Problem Causes Solutions High salt content in crude after desalter Low wash water injection, poor mixing Increase wash water, ...

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In CCR, continuous catalyst regeneration is used mainly to:

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The main function of the reflux is to:

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The typical temperature at the bottom of the CDU column is around?

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What is the typical temperature range for the reformer reactor in CCR units?

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Which product stream is the primary output of a CCR unit?

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