Static Equipment Interview Questions <Full HD>

Mastering the Static Equipment Interview: 50+ Essential Questions and Expert Answers

Q4: How do you differentiate between a U-tube, Fixed Tube Sheet, and Floating Head exchanger?

The Practical Answer:

| Type | Shell Side Cleaning | Tube Side Cleaning | Thermal Expansion | Cost | | :--- | :--- | :--- | :--- | :--- | | Fixed Tube | No (Chemical only) | Yes | Uses expansion bellows | Low | | U-Tube | Yes | No (difficult due to U-bend) | Individual tubes bend | Medium | | Floating Head | Yes | Yes | Floating head moves | High | static equipment interview questions

Best answer for "Which do you choose?" – Fixed tube for clean, non-corrosive fluids with low delta-T. Floating head for dirty service requiring frequent bundle pulling. Fundamentals & Theory (all levels)

Question Categories & Sample Questions

1. Fundamentals & Theory (all levels)

• What is static equipment?
• Explain the differences between static and rotating equipment.
• Define ASME Section VIII and its scope.
• What are common failure modes in pressure vessels and tanks?

2. Codes, Standards & Compliance (intermediate/senior)

• Which codes/standards have you used for vessel and exchanger design and inspection?
• How do you determine the applicable design code for an existing vessel?
• Explain the process for registering a pressure vessel with local authorities.

3. Design & Engineering (intermediate/senior)

• Walk me through the steps to design a cylindrical pressure vessel for 10 bar and 150°C. (Expect discussion of design pressure/temp, material selection, corrosion allowance, thickness calculation per code.)
• How do you select materials for an exchanger handling sour service?
• Describe nozzle reinforcement calculations and when they are required.

4. Fabrication, Welding & NDE (intermediate/senior)

• What fabrication inspection points are critical during vessel construction?
• Which NDE methods are suitable for welds on pressure equipment and why?
• Explain PWHT — purpose, indications, and risks of inadequate PWHT.

5. Inspection, Maintenance & Fitness For Service (FFS) (intermediate/senior)

• Describe a typical in-service inspection program for a fired heater or pressure vessel.
• How do you perform remaining life assessment for corroded storage tanks?
• What is Fitness-For-Service assessment and when is it required?

6. Corrosion, Materials & Metallurgy (intermediate/senior)

• Explain types of corrosion relevant to static equipment and mitigation methods.
• How does chloride-induced stress corrosion cracking occur and how to prevent it?
• What metallurgical indicators suggest hydrogen embrittlement?

7. Heat Exchangers & Special Topics (intermediate/senior)

• Compare shell-and-tube and plate heat exchangers: pros/cons and failure modes.
• How do you approach tube-to-tubesheet welding and inspection?
• Describe cleaning and mechanical cleaning techniques for fouled exchangers.

8. Stress, Supports & Foundations (intermediate/senior)

• How do you assess nozzle loads and design support saddles?
• What is thermal expansion restraint and how do you accommodate it?
• Explain piping support types and inspection priorities.

9. Safety, Risk & Incident Response (all levels)

• What are the key safety checks before performing maintenance on a pressure vessel?
• Describe how you would investigate a vessel leak discovered during operation.
• How do you prioritize asset repairs in a plant-wide integrity risk assessment?

10. Practical & Behavioral (all levels)

• Describe a time you identified a potential failure in static equipment and what you did.
• How do you communicate inspection findings to operations and management?
• How do you keep current with codes and best practices?

Candidate Level Targets

• Junior/Entry — basic principles and safety awareness
• Intermediate — practical experience, inspection, and maintenance
• Senior/Lead — design, codes/standards, integrity management, failure analysis

Q9: What are the main types of shell & tube heat exchangers based on TEMA?

Answer: TEMA classifies by front head, shell type, and rear head: What is static equipment

• AEL: Removable bundle, floating head (most common for fouling services)
• BEM: Fixed tubesheet (non-removable, cheap but no thermal expansion)
• CFU: U-tube (allows differential expansion, but difficult to clean inside bends) Also mention TEMA classes: R (refinery), C (commercial), B (chemical service).

Q1: What is static equipment? Give examples.

Answer: Static equipment refers to process equipment that has no moving parts. Its primary functions include storing, containing, separating, or transferring heat/fluids. Common examples:

• Pressure vessels (reactors, separators, accumulators)
• Storage tanks (atmospheric and low-pressure)
• Heat exchangers (shell & tube, plate type)
• Boilers and fired heaters
• Piping, valves (non-actuated), and towers (distillation columns)

Q13: How do you perform a hydraulic test? What is the test pressure for a new ASME vessel?

The Procedure: (ASME VIII UG-99)

1. Pressure: 1.3 x MAWP (Maximum Allowable Working Pressure) for hydrostatic. (Pneumatic is 1.1 x MAWP, but rarely used due to stored energy risk).
2. Temperature: The metal temperature must be > MDMT + 30°F to prevent brittle fracture.
3. Hold Time: Minimum 30 seconds to visually examine all welds and joints.
4. Pass Criteria: No visible leakage, no permanent distortion. Drops in pressure indicate leakage or air entrapment.

Interview Pack (suggested set by level)

• Junior (30–40 min): 6–8 questions mixing fundamentals, safety, and one behavioral.
• Intermediate (45–60 min): 8–12 questions across codes, inspection, metallurgy, exchangers, and one practical case.
• Senior (60–90 min): 10–15 questions including design problem, FFS case study, failure analysis, leadership/strategy.