✔ Possible Causes: Blocked overhead condenser → Poor vapor condensation. Overloaded reflux drum → Excess vapor flow.

✔ Pump-around circuits remove heat from specific sections of the column.✔ Help reduce furnace fuel consumption by using heat recovery.✔ Control temperature

✔ Reflux is a liquid stream returned to the column to improve separation.✔ Helps achieve sharper separation between different fractions.✔ Increases efficiency by maintaining ...

The CDU consists of several key sections, each playing a vital role in the crude oil separation process: 1. Preheat Train ✔ Crude oil is preheated using heat ...

The Desalter is a crucial part of the CDU that removes impurities from crude oil before it enters the furnace. ✔ Key functions of the Desalter:

The Crude Distillation Unit (CDU) is the first processing unit in a refinery where crude oil is separated into different fractions based on boiling points. Below are key interview questions with detailed answers. ✅ General Process Questions 1️⃣ What is the ...

🔹 Problem: Operators observe poor desulfurization performance and an increase in coke formation inside the reactor. 🔹 Possible Causes: ✔ Hydrogen ...

Below are the answers to each question one by one. ✅ General Process Questions 1️⃣ What is the purpose of the Naphtha Hydrotreater (NHT) unit? 🔹 The Naphtha Hydrotreater (NHT) Unit removes sulfur, nitrogen, oxygen, and metal impurities from naphtha using hydrogen ...

Signs include high reactor pressure drop, decreased conversion efficiency, and higher reactor temperatures. Mitigation involves increasing hydrogen-to-feed ratio, periodic catalyst replacement, and using guard beds.

Follow Emergency Shutdown Procedures (ESD): 1️⃣ Stop the feed pump. 2️⃣ Close reactor inlet valves. 3️⃣ Maintain nitrogen purging. 4️⃣ Monitor hydrogen venting to prevent pressure buildup.