1. Minimum Size Requirement

What is the minimum size requirement for vents and drains according to the provided information?

A) NPS 1/2
B) NPS 3/4
C) NPS 1
D) NPS 1 1/2

Show Answer

Explanation: Vents and drains shall have a minimum size of NPS 3/4 according to the provided information.

2. Block Valves for Operating Units

What is the requirement for vents and drains that are required while the unit is operating?

A) No block valves needed
B) Must have a single or double block valve
C) Only single block valve required
D) Only double block valve required

Show Answer

Explanation: Vents and drains required while the unit is operating must be provided with a single or double block valve as applicable.

3. Material of Valves for Testing Alloy Piping

What material of valves should be supplied for testing alloy piping, and what action should be taken after testing is completed?

A) Stainless steel valves; no action required after testing
B) Alloy steel valves; leave them in place
C) Carbon steel valves; remove them after testing
D) PVC valves; seal weld them in place

Show Answer

Explanation: Carbon steel valves should be supplied for testing alloy piping, and they should be removed after testing. Seal welding of threaded caps in hydro testing vents and drains should be carried out in the field.

4. Venting and Draining High Points

What is the general requirement for venting high points and draining low points of all lines?

A) Vent only high points
B) Vent high points and drain low points
C) Drain only low points
D) Vent and drain only where block valves are present

Show Answer

Explanation: High points of all lines shall be vented, and low points shall be drained, except where the line can be vented or drained elsewhere.

5. Valves in Vents and Drains

Under what conditions should valves be considered for vents and drains?

A) Valves always needed
B) No need for valves
C) Determine need based on frequent use and safety aspects
D) Valves required only for process vents

Show Answer

Explanation: The need for valves in vents and drains should be determined based on frequent use during start-up and operation of the unit and considering safety aspects in their operation.

6. Double Valves for Process Vents

When are double valves normally considered for process vents and drains?

A) Only for low-pressure systems
B) For lines with a rating of 600# and higher
C) Always for all process vents
D) Only for lines with a rating of 1500# and higher

Show Answer

Explanation: Double valves are normally considered for process vents and drains for severe process conditions and lines with a rating of 900# and higher, as per P & I drawings.

7. Field Seal Welding

What action should be taken for threaded caps in hydro testing vents and drains after completing the hydrostatic test?

A) Remove caps and leave them in place
B) Replace caps with new ones
C) Seal weld caps in place
D) Ignore the caps

Show Answer

Explanation: After completing the hydrostatic test, seal welding of threaded caps in hydro testing vents and drains should be carried out in the field.

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Recommended courses (Published on EPCLand)

1. Complete Course on Piping Engineering
2. Basics of Piping Engineering
3. Piping Layout Engineering
4. Piping Material Engineering 
5. Piping Stress Analysis
6. Material Requisitions 
7. Piping Material Specifications
8. Valve Material Specifications
9. Plant Design & Layouts-OISD 118
10. Isometric Management

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• Basics of Oil and Gas Industry
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• Layout
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• Articles on Piping Specialty Items

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