Fitter Interview Question and Answer:

1. Full Form of IBR?
Ans.. INDIAN BOILER REGULATION

Fitter Interview Question and Answer

2. Most commonly used material for gasket ?
Ans.. Compressed Asbestos Fiber

3. Which gasket is recommended for high temperature and high pressure application ?
Ans.. Spiral Wound Metallic Gasket.

Fitter Interview Question and Answer

4. Thickness of pipe bevel edge should be?
Ans.. 1.25mm

5. Where to be used Try Square?
Ans.. for checking 90 degree angle

6. Formula for bevel degree of a pipe?
Ans.. TAN DEGREE X THICKNESS

7. USES OF ASTM A53 & A106
Ans.. ASTM A53 pipes are mainly used for utility services whereas A106 Gr. B pipes are used for high Pressure & high temperature services.

8. How many types of piping drawing are there?
(a) ISOMETRIC DRAWING
(b) P&ID DRAWING
(3) GAD
(4) PLPG–PIPE LAYOUT PLAN GUIDE

9. Isometric Drawing direction..
Ans.. East, West, North, South, UP, DOWN

Also Read …Type of pipe support

10. how many types of pipe metal are there?
(a) Carbon Steel
(b) Stainless Steel
(c) CARBON ALLOY STEEL
(d) LT CS
(e) DSS
(f) GALVANISED
(g) NACE

11. How many types of flange are there ?
(a) WNRF
(b) SWRF
(c) SORF
(d) THREADED FLANGE
(e) RJF FLANGE

12. Color coding for pipeline?
(a) RED – FIRE FIGHTING
(b) GREEN – WATER
(c) YELLOW– FLAMMABLE
(d) LIGHT BLUE –  AIR
(e) DARK BROWN – OIL (COMBUSTIBLE LEQUID)

Fitter Interview Question and Answer

13. What do you mean by NPD NB
NPD– NOMINAL PIPE DIA (NPD-4INCH)
NB– NOMINAL BORE (NB-100)

Also Read…Pipe OD chart

14. What is rolling in Isometric Drawing?
Ans.. if any line changing direction at any degree that is called pipe rolling.

15. Types of Rolling in Isometric drawing?
(a) Horizontal
(b) Vertical

Fitter Interview Question and Answer

16. Where to be used Tee ?
Ans.. Tee is used to connect Branch in pipe line.

17. How many Types of Reducer are there ?

Ans.. Two types of Reducer are there.

1. Concentric reducer
2. Eccentric reducer

18. Is Concentric reducer used for pump suction if Yes/No explain ?
Ans.. No. if concentric reducer is used at pump suction, which results in Cavitation and cause damage to Pump. To avoid this problem, Eccentric Reducer with flat side up (FSU) is used in Pump Suction.

19. What is the Uses of Concentric Reducers?
Ans.. Concentric reducers is used to Pump discharge, vertical pipeline etc.

20. What is the Uses of Eccentric Reducers?
Ans.. Eccentric reducers is used in Pump suction to avoid Cavitation, to maintain elevation (BOP) in rack.

21. How much Pipe fabrication work can be done at 8 hour?
2 inch Pipeline Up to 60 TO 100 inch
10 inch pipeline Up to 140-180 inch
20 inch pipeline Up to 160 TO 200 inch
(This is not a proper answer it can be vary upon different kind of job)

22. How much erection work can be done at 8 hour?
1 TO 6 INCH .. 8 TO 10 SPOOL
8 TO 20 INCH .. 4 TO 6 SPOOL
24 TO 42 INCH .. 2 TO 3 SPOOL
(This is not a proper answer it can be vary upon different kind of job)

23. How many types of Joint are there between Pipe and valve?
(a) Butt Joint
(b) Socket joint
(c) Flanged joint
(d) Threaded joint

Also Read…pipe and pipe fitting

Fitter Interview Question and Answer

24. How many Types of Valve are there?
(a) Gate Valve
(b) Glove Valve
(c) Control Valve
(d) Ball Valve

25. Classes of Flange
150#
300#
600#
900#
1500#
2500#

26. The Radius of Short Radius Elbow ?
Ans.. 1 × Pipe Diameter

27. Radius Of Long Radius Elbow
Ans.. 1.5 × Pipe Diameter

28. How much is Pipe bevel edge in mm?
Ans.. 1.25 Standard Size.

29. How many Types of Weldolet are there?
1. Weldolet
2. Sockolet
3. Threadolet
4. Letrolet
5. Elbolet

Fitter Interview Question and Answer

30. How much gap should given for arc and tig and mig welding?
ARC 3MM
TIG 4MM

31. How many Types of pipe bevel are there?
Simple bevel
J type bevel
Compound bevel

Fitter Interview Question and Answer

32. Different Between pipe and tube ?
Pipe is identified by NOMINAL BORE (NB) and Thickness is defined by Schedule

TUBE is identified by OD & its thickness as BWG (Birmingham wire gauge or 1/100 inch).

Also Read…Type of pipe support

33. Elbow Center calculation Short Trick?
STD 90 .. INCH X 38.1
STD 45 .. INCH X 15.7 

34. Uses of Long Radius?
Ans.. LONG RADIUS elbow are used for small pressure drop

35. Uses of Short Radius?

Ans.. Short Radius elbow are used for high pressure drops. For catalyst flows vary long radius elbows are used.

36. Any Radius Elbow Center formula ?
STD.. TAN(DEGREE/2) X 1.5 X 25.4 X INCH
LR.. TAN(DEGREE/2) X 2 X 25.4 X INCH
SR.. TAN(DEGREE/2) X 1 X 25.4 X INCH

37. What is OD ID CF?
outer diameter of a pipe is called OD.
inner diameter of a pipe is called ID.
Circumference of a pipe is called CF.

38. How to find CF?
Ans.. PIPE OD x 3.142 = CF

Fitter Interview Question and Answer

39. How to find OD?
Ans.. CF/3.142 = OD

40. After 12 inch pipe outerdiameter calculating formula ?
Ans.. PIPE INCH X 25.4 = OD

41. From which size onward NB of pipe is equal to OD of pipe ?
Ans.. From the size 14” and onwards NB = OD of pipe.

42. Types of Blind in pipe?
FLANGE BLIND
SPECTAC BLIND
RING SPACER BLIND
SPADE BLIND
ORIFACE BLIND

Fitter Interview Question and Answer

43. Material is used for Temperature above 426° C?
Ans.. Alloy steel materials.

Read This Also…Pipe bevel formula

44. which Material is used for Corrosive Fluid?
Ans.. Stainless steel materials (SS)

45. How to measure Pipe ID ?
Ans.. PIPE OD-THK X 2= ID

Read This Also… Pipe Schedule Chart

46. How many Types of Pipe Schedule are there ?

Ans.. 5,10,20,30,40,60,80,100,120,140,160,STD,XS,XXS

47. What are the types of Pipe Support ?
Elbow Trunnion Support
Pipe Trunnion Support
Spring Support
Pipe Guide Support
Pipe Shoe Support
Clamp Pipe Support

Fitter Interview Question and Answer

48. What is formula to calculating Spanner size?
BOLT INCHS = MM X 1.5 + 3 = SPANNER SIZE

1 INCH= 25.4 X 1.5 = 38.1 +3 = 41 SPANNER SIZE

49. What is Thickness of Cutting Wheel ?
Ans.. 3mm to 3.2

50. How many Types of Grinding Machine are there?
AG-4
AG-5
AG-7
AG-9

Also Read…Important shortcut for Fitter and Fabricator

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