Aramco CBT Exam Questions Piping | Gasket Installation

This article is about Aramco CBT Exam Questions Piping related to topic of Gasket Installation as per Saudi Aramco or International Standards. This questions can be useful for who are attending CBT Aramco Test or other international test for Mechanical QC Inspector or Engineer.

Aramco CBT Exam Questions Piping | Gasket Installation

GASKET INSTALLATION CHECKLIST (APPROVED)

1. What is the requirement for bolting and torquing flanges at SA?

Ans: SAES-L-050, Tables and applicable procedure.

2. What is a friction factor?

3. What is the difference between torqueing CS and SS bolting?

Ans: Yield strength is greater in Carbon and torque values are greater

4. Does the use of galvanized bolts require any special torqueing consideration, or can the CS bolt torqueing values be used?
5. What is a spectacle plate?

Ans: Mandatory SA Std dwg with plate used for service and shutdown (isolation) for maintenance purposes.

6. What are jackscrews and when are they required?

Ans: They are located at flanged connections To facilitate maintenance and removal of spectacle and orifice plates to facilitate maintenance.

7. What is often overlooked during orifice flange fabrication?

Ans:  Grinding butt welds flush and seal welding orifice.

8. What NDT methods are required during orifice flange installations?

Ans: Visual and PT/MT.

9. Flange tolerances during construction are found where?

Ans: SAES-L-050 & PFI-ES-3.

10. Describe how flanges can be misaligned in different directions?

Ans: Rotational offset & hole misalignment misaligned vertically & horizontally.

11. What is cold spring?

Ans: Application of mechanical stress (bending twisting pulling) upon a piping segment to achieve bolting and connection to another segment. Is cold spring acceptable? No

12. How can an inspector determine if cold spring exists visually on a flanged section of piping?

Ans: Visual determination is easy. Close inspection of flanged connection and any visible deformation, especially in small diameter sections.

13. When a flange connects to a pump or other equipment, is there any special tolerance involved?

Ans: Yes, Mfg tolerance.

THREADED JOINTS (SAES-L-010, PIPs, Checklists)

1. 1. What care must be exercised to avoid deep cuts in threaded piping installation?                                                                                                                                                                                                                                                            Ans: Use strap wrenches or coverings during tightening.
   2. What is the maximum diameter piping allowed in hazardous service?                                                                                                                                                                                                                                                                                       Ans: 1-1/2”
   3. What is the minimum sized piping that can be installed on pipe racks?                                                                                                                                                                                                                                                                                   Ans: 1” (AB-036207-Pipe spacing)
   4. What is the required thread engagement for piping at SA and where can it be found?
   5. What is the requirement for seal welding at SA?                                                                                                                                                                                                                                                                                                                       Ans:   SAES-L-010 and specifications.
   6. Can Teflon tape be used prior to seal welding?                                                                                                                                                                                                                                                                                                                        Ans: No
   7. How many threads can be visible after seal welding threaded joints?                                                                                                                                                                                                                                                                                       Ans: Zero, seal welding must cover all threads.

SOCKET JOINTS (SAES-L-010, PIPs, Checklists)

1. 1. What is the gap requirement for socket welds for new construction?                                                                                                                                                                                                                                                                 Ans: 1.5 mm to 3 mm gap prior to welding.
   2. What is the best way to assure consistent gap is maintained?                                                                                                                                                                                                                                                                             Ans:   Use of gap-o-let rings.
   3. What is the minimum fillet weld size for a socket welded connection?                                                                                                                                                                                                                                                               Ans: 1-1/4t but not less than 3.2 mm.
   4. What are common failures in the quality system during fit up that leads to hydrotest failures?                                                                                                                                                                                                                         Ans:  Failure to properly clean, deburr and degrease fittings and piping prior to welding. Oil residue from cutting causes weld porosity and leakage during hydro tests.

SPECIALTY ITEMS

• Seal Welding.
• Leak tests.
• Vacuum Box tests.
• Functionality Tests.
• Preservation Monitoring (Construction).
• Preservation Planning (Construction).
• B-standard Compliance (Construction).
• Pre-Commissioning (a complete list of QC coverage on activities is to be established by TPSA—–Visual Inspections, Chem cleaning, flushing, Functionality Tests of Equipment, Engineering Forms, Documentation, Lay-up & Preservation, Noise Control, B-standard Compliance).

Quality Control Mechanical Interview Questions | CBT Aramco

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Piping QC Notes & CBT Aramco | Piping Erection & Installation

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