Interview questions for pipe fitters and fabricators

Interview questions for pipe fitters and fabricators

Interview questions for pipefitters and fabricators (Part-1)

As we have discussed in our previous article about the "Preparation for an Interview " and"interview questions", Now we will discuss the possible questions asked by an interviewer for pipefitters and pipe fabricators specifically. 
These questions are collected from different interviews and discussions with many senior interviewers.
So let's move to the first question which you will be asked by an interviewer after asking some general questions.

From isometric drawings:-

Interview questions for pipe fitters and fabricators
Do you understand isometric drawing

The first question will be related to isometric drawing. 1- Do you understand isometric drawing? Obviously, you will say "yes".

 Then the next question may be that "Can you fold the template?" The person who knows the ISO metric can easily fold it.

 In the next article, we will discuss piping drawing in detail. 
Because the next question can be related to this. How many types of drawings are in the piping? 
There are mainly four types of piping drawings.1- ISO metric- 2-GAD 3- P&ID 4-PLPG, We will discuss these in detail in the next issue. 
Now let's take the next question, how many directions are shown in the ISO metric drawing? 
ISO metric drawing shows a total of six directions NORTH, SOUTH, EAST, WEST, UP and DOWN. 
 The next important question you may be asked about rolling - "How many types of rolling in isometric drawing?" 
There are two types of rolling in isometric drawing, first vertical rolling and second horizontal rolling which you can see in the above drawing.


The next important question can be asked by an interviewer about metals or materials and their codes, like-"How many types of metals do you know ?" 
which you can see in detail by going to the link.MATERIALSCodes for pipes and their fittings are as follows:-
 Carbon Steel: ASTM A53 Gr. A/B, ASTM A106 Gr. A/B/C, ASTM A333 Gr.1/Gr.6 
 Alloy Steel:- ASTM A335 Gr.P1/P2/P5/P7/P9/P11/P12/P22. 
 Stainless Steel:-ASTMA312TP304/TP304L/TP304H/TP308/TP310/TP316/TP316L/TP316H/TP317/TP321/TP321H/TP347/TP347H/TP348/TP348H 
 Nickel Steel:- ASTM A333Gr.3/ Gr.8.


The next question is about Fittings.In the questions that come under Fittings, we first take Flange.
Interview questions for pipe fitters and fabricators
The first question may be "what types of flanges are? or "How many types of piping flanges do you know"We take this question in some detail.

Flanges can be classified as

Based on pipe attachment:Slip-on:-The Slip-on type flanges are attached by welding inside as well as outside. These flanges are of forged construction. 
Socket Weld:-The Socket Weld flanges are welded on one side only. These are used for small bore lines only. 
Screwed:-The Screwed-on flanges are used on pipelines where welding cannot be carried out. 
Lap Joint:-The Lap Joint flanges are used with stub ends. The stub ends are welded with pipes & flanges are kept loose over the same. 
Welding Neck:-The Welding neck flanges are attached by butt welding to the pipe. These are used mainly for critical services where the weld joints need a radiographic inspection. Blind:-
Interview questions for pipe fitters and fabricators
The Blind flanges are used to closing the ends which need to be reopened 
Reducing:-The reducing flanges are used to connect between larger and smaller sizes without using a reducer. In the case of reducing flanges, the thickness of the flange should be that of the higher diameter. 
Integral:-Integral flanges are those, which are cast along with the piping component or equipment types 
Based on pressure/temperature ratings 150 # B. 300 # C. 400 # D. 600 # E. 900 # F. 1500 # G. 2500#
Based on facing Flat face. (FF) Raised face. (R/F) Tongue and groove. (T/G) Male and female. (M/F) Ring type joint. (RTJ)
Based on face finish  smoothfinish. Serrated finish-


Our aim is to cover all the questions that have been asked in the previous interviews so that you can fully be prepared yourself for an interview and you can be successful.
 In interview questions for pipefitters and fabricators"(PART-2), we will discuss piping drawings in detail along with the questions.

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