Top 100+ Qc Welding Inspector Interview Questions And Answers
Question 1. What Are The Main Duties Of The Piping Inspector?
Answer :
Material receiving inspection
Storage & maintenance
Cutting, assembly & healthy-up
Pre-welding inspection
Visual inspection of socket & threaded joints
Pneumatic test for reinforcing pad
Pickling & passivation
Database reporting
Visual inspection of finished spools
Piping pre-inspection & spool erection
orifice flange inspection
Pipe support inspection
Verification of slope
Internal cleanliness
Valve installation
Piping flange joint inspection
Pre-test punch list
Hydro checking out
pre-commissioning
Question 2. How Many Types Of Gaskets Do You Know?
Answer :
Full face (Asbestos)
Spiral wound metal
Ring type
Metal jacketed
Inside bolt circle
Architecture & Construction Interview Questions
Question three. What Are The Different Types Of Mating Flanges? Name The 4 Most Common?
Answer :
Flat face
Raised face
RTJ (Ring type Joint)
Tongue & groove
Male & girl
Question 4. What Type Of Information Do You Get From Isometric Drawings?
Answer :
Line routing
Line orientation
Northing
Easting & elevation
Bill of mat’l
Insulation kind
NDT requirement
Revision fame
Material magnificence’n
Design
Operating & testing temp/stress
Paint machine
P&ID
Slope
Service information
Flow route
Support information
Notes
Question five. What Type Of Codes And Standards Do You Use As A Piping Inspector?
Answer :
ASME B31.3
ASME B31.1
ASME B31.Five
ASME B31.Nine
JERES-A-004
JERES-A-007
JERES-A-206
JERES-A-301
JERES-L-one zero five
JERES-L-108
JERES-L-one hundred ten
JERES-L-one hundred fifty
JERES-L-130
JERES-L-310
JERES-L-350
JERES-L-351
JERES-W-011
JERES-W-016
Building creation Interview Questions
Question 6. What Are The Types Of Valves?
Answer :
Gate valve
Globe valve
Butterfly valve
Needle valve
Check valve
Control valve
Knife gate valve
Based on characteristic:-
non-return valve
isolation valve
regulation valve
unique reason valve
Question 7. What Are The Main Things You Will Check Before Bolt Torquing?
Answer :
Size of bolt
Calibration of torque wrench
Manual /hydraulic require
Lubricant
Friction element for threaded lubricant
Torque value
JERES-L-109 / 351
Welding Technology Interview Questions
Question eight. Write three Saudi Aramco Piping Standards (l-collection)?
Answer :
SAES-L-105
SAES-L-108
SAES-L-110
SAES-L-150
SAES-L-one hundred thirty
SAES-L-310
SAES-L-350
SAES-L-351
Question 9. Write Minimum Ten Hydro Static Test Punch List Items Prior To Commence Hydro Test At Site? Indicate Which Is Yes Item & No Item?
Answer :
All warm paintings shall be completed
Strainers shall be removed
All NDT & DT final touch
PWHT completion
Adequate attachment
Coating on weld joint will be eliminated.
Calibration of equipments used. Test blind MTC.
Test certificate of trying out fluid
Components in new piping structures which intervene with filling, venting, draining or flushing shall now not be set up.(orifice plates, drift nozzles, sight glasses)
All joints (flange, threaded, welded or mechanical seals) are left exposed for visible leak detection throughout the strength test.
All permanent flange joints were inspected, gasket mat'l demonstrated & properly torque.
Drains will be supplied at all low factors of the piping system.
Vents and drain valves, each transient and permanent, conforms with the piping magnificence or rating.
Supports are hooked up. Additional temporary assist may be established as required.
Expansion joints and spring hangers or spring helps are furnished with brief restraints.
Arc strikes, gouges, and other indications of careless workmanship (including surface porosity, choppy weld profiles, and undercut) will be eliminated by way of grinding and inspected via magnetic particle or liquid penetrant technique.
Drains are provided without delay above test valves (vertical strains)
All threaded joints as much as the first block valve of hydrocarbon pipeline are seal welded. Thread engagement has been confirmed & normal.
The stress testing manifold is separately pressure tested to at least 1.2 instances the device test stress however no longer less than the discharge pressure of the pump used for the stress checking out.
Line compliance with Isometrics:
Correct Materials applied grade/schedule (Bill of Mat'ls)
Correct flange and fittings score
Construction tolerances consistent with SAES-L-350
Mechanical Engineering Interview Questions
Question 10. Weep Hole Size Shall Be Drilled For Dummy Pipe Support Will Be ________mm?
Answer :
Weep hollow shall be placed near base plate for all vertical dummy pipe assist & near run pipe at 6’O clock role for horizontal dummy.(SAES-L-350 thirteen.2.3 & L-310 14.7.2)
Question 11. What Is Dead Leg And Explain?
Answer :
Dead Legs: Piping sections which are ability for internal corrosion because of drift stagnation.
Dead legs are created in particular by way of flow stagnation improved with presence of settled water and solid deposits.
When the duration of the phase or department , for 2 inch pipes and large, is longer than 3 instances its pipe diameter, or 1.22 m (4 toes) in duration, the duration of the useless leg is the gap measured from the outdoor diameter of the header (or run) to the near stop of the branch valve.
For department connections of 1-½ inch NPS and smaller, the length of the useless leg is the distance measured from the end of the boss to the near give up of the valve.
FAA Construction Interview Questions
Question 12. Write Any 2 Types Of Piping Supports?
Answer :
Shoe
spring loaded
resting
put on pad
Architecture & Construction Interview Questions
Question 13. What Type Of Connection Is Acceptable For A 24” Header, 12” Branch?
Answer :
Weldolet or welded department with reinforcement pad as per JERES-L-a hundred and ten app: A.
Question 14. How Many Minimum Pressure Gauges To Be Installed During Hydro Test?
Answer :
Two (JERES-A-004, Para 7.1.5)
Question 15. What Is A Pip?
Answer :
Process industry practices.
Piping Interview Questions
Question sixteen. Name The Different Types Of Service Conditions?
Answer :
NFS:- Normal offerings, Category M, Category D, High stress fluid services (ASME-B31.3).
Question 17. How Do You Verify (name Several Items To Check) That The Correct Piping Material Is Used?
Answer :
Material specification
Pipe length
Schedule
Length
Flange face score
Olet size score
Threaded/socket weld type
MTC
PMI report
Brazing Welding Interview Questions
Question 18. How Do You Identify Fittings And Flanges?
Answer :
By fabric classification
Size
Rating
Joint kind (lap, socket, threaded, butt), face;
Building construction Interview Questions
Question 19. How Do You Check Piping For The Correct Schedule?
Answer :
Verify pipe material thickness with the aid of Vernier at the stop or UT on surface or stenciling carried out by using the manufacturer (visual) or warmness quantity, traceability by using MTC of product.
Question 20. What Is The Standard Mill Tolerance For Piping 2’’ & Less?
Answer :
12% of nominal wall thickness.
Mechanical Fitter Interview Questions
Question 21. What Is The Tolerance For Ovality Of Piping?
Answer :
five% of nominal diameter at any pass section apart from weld give up & 3% at weld stop (JERES-L-350 Para 9.2).
Question 22. What Is The Difference Between Torquing Cs And Ss Bolting?
Answer :
CS:- Yield electricity High; Torque price High.
SS:- Yield electricity low; Torque price low.
Question 23. What Are Jackscrews And When Are They Required?
Answer :
Used in flange joint assemblies which frequently require frequent separation consists of orifice plate, spectacle plates, spacers, monitors, and drop out spools shall be provided with jack screw to facility separation and starting for the upkeep. When flange separations are used, jackscrews are not required. Jackscrews will be installed to be reachable from each sides of the pipe. For orifice flanges, jack screws will be established at three & nine o’ clock positions.(JERES-L-310 Para 17.7).
Pipe Fitter Interview Questions
Question 24. What Is Often Overlooked During Orifice Flange Fabrication?
Answer :
Inside floor of welded joints at @ orifice flanges shall be floor & machined clean (JERES-L-350 Para 10.Four.2).
Orientation of faucets is as in step with JERES-J-0001.
All parallel pipe lines with adjacent orifice fittings shall have a min spacing of 300 mm (12 in) among flanges out of doors diameters if horizontal faucets are required. Where this spacing isn't realistic comply with JERSEY-J-0001.
Orifice flanges in adjoining traces shal be staggered so that no two pairs of orifice flanges are much less than 1 m (3ft) aside.
Welding Technology Interview Questions
Question 25. What Is The Maximum Diameter Piping Allowed In Hazardous Service?
Answer :
Socket weld: - 2” for preservation & minor amendment & 1-½” for brand spanking new production.
Threaded:- 1-½” for wellknown becoming & valve, and a pair of” most whilst required for maintenance, minor area minor change of present piping machine(JERES-L-one hundred ten Para 7.2).
Question 26. Can Teflon Tape Be Used Prior To Seal Welding?
Answer :
No, (JERES-L-one hundred ten Para 8.5).
Question 27. How Many Threads Can Be Visible After Seal Welding Threaded Joints?
Answer :
No, should cowl all uncovered threads (JEREZ-W-011 Para 12.15.3).
Mechanical Engineering Interview Questions
Question 28. What Is The Gap Requirement For Socket Welds For New Construction?
Answer :
1.5mm-3mm (ASME B31.3 fig 328.5.2C).
Question 29. Give Examples Of Unique Support Details That Allow Piping Freedom Of Movement For Thermal Expansion?
Answer :
Guide assist
Moving saddle assist
Expansion balloons
Shoe assist
Spring loaded
Question 30. When You Will Apply 24 Hours Recorded Hydro Test?
Answer :
If for justifiable safety reasons the UG line ought to be backfilled, then the joints shall continue to be uncovered throughout testing, in any other case the take a look at will be a 24 hour recorded take a look at.(JERES-L-one hundred fifty Para 7.Four.2).
Question 31. Difference Between Carbon Steel And Stainless Steel?
Answer :
CS:- Low value, no chromium content material, suitable for non-corrosive carrier upto 350 degree C, max carbon zero.3%.
SS:- Contains greater than 12% Cr, zero.08% C, Suitable for corrosive, cryogenic, High temp services, costly.
Question 32. Difference Between Rt & Ut?
Answer :
RT:- Uses X-ray or Gamma ray to locate discontinuities, well-knownshows normally volumetric. Planar defects & subsurface defects now not detectable without problems.
UT:- Uses ultrasonic beam to come across discontinuities famous both planar & volumetric defects, but length & specific place of defects are not without problems identifiable. Possible only on substances that do not refract AT waves.
Question 33. Difference Between Pt & Mt?
Answer :
MT:- Only Applicable for ferromagnetic materials & able to stumble on each surface & sub floor discontinuities, evaluate to PT exam it takes less time for testing & inspection; Applicable for large temp range.
PT:- Applicable for both ferromagnetic & non ferromagnetic substances & able t locate simplest surface discontinuities, It requires more time; Applicable for small temp variety.
FAA Construction Interview Questions
Question 34. How Do You Control Material In Fabrication Shop?
Answer :
All substances shall have material spec and grade stamped or stenciled & truely marked with everlasting marker.
All materials, warmth no. Could be made traceable to MTC from authorized vendor & no fabric substitution might be executed with out right approval from the business enterprise.
All materials shall be saved & stacked one at a time as per cloth grade.
Heat no. Will be transferred earlier than reducing into pipes that need to be reduce.
All materials shall be color coded as in step with traceability process.
Question 35. Write Inspection Items During Valve Installation?
Answer :
Valve kind corrects on the region
Valve test certificates
Valve tag as in line with P&ID
Valve course of float as in line with P&ID
Gasket bolts as according to isometric & type
Handle route
Chain wheel hooked up
Valve flange face situation
