Piping interview preparation

Are you working as Piping construction engineer, Are you working in Piping fabrication and erection. Do you looking for job change and expecting interviews. Are you preparing for interview? what you have to do...what you should prepare...

 QUANTITY : 

 Piping interview questions based on scope of work  First learn thumb rules of quantity can be produce in hour and in man day and in month. Most interviewer want to check the ability of you by asking you how much inch dia can produce one day? howmany manpower required to produce one inch dia? one gang can fabricate howmuch inchdia? for one gang howmany power required ? 

one welder can produce howmuch inchdia in fabrication? one welder can produce howmuch inchdia in erection ? howmuch inchmeter can lift oneday? 

MATERIAL : 

Piping interview questions based on materials  what are the material you used? what is material grade? what is material chemical composition? what is ASTM code for the material ? which welding method you can do for the selected material? what are the consumables you used? what are the precautions to be takencare to preserve and handling the consumables? what is ASME code for various pipe and fittings and valves? what are the ratings of flanges? do you have exposure in alloy material

Welding 

PIping interview questions based on welding what are the welding positions? what are the welding method? what are tools and tackles required for particular welding method? what consumables used?what is purging? what is purging gas? howmuch consumbale required to complete particular quantity? what are the code used for selection of consumbales, what are the welding defects, howmuch inchdia one welder can produce? what is production rate?

Quality 

Piping interview questions based on quality. what are the NDT methods? what is RT and UT? howmuch percentage RT carreid out? what precautions to be taken to do 100 percentage RT? How to repair joints which failed in RT? what are the certificate required before to start up with material ? what is heat Number? what is material colour code? how you will seperate material with colour code? how to stack material of different material together? what is specification? what is schedule? how to check fitup? what are the reports to be prepare? what is loop file? documents required for loop file? what is medium of hydrotest? how to calibrate pressure gauge? how to select pressure pressure gauge ? What is PWHT? what is DPT? what is preheat? how to do preheat? what is stress releving? 

Lifting : 

what are the cranes used? howmuch metric done can be lift? what are the lifting tools and tackles? 1" sling will lift howmuch MT? what is lifting scheme? what is lifting radius? what is lifting height? what is boom capacity? 

hydrotest : 

what is vent and drain where it should be? what are things to be required to carry out hydrotest? what is testing pressure? what are the testing medium? what is pressure gauge range? how to calculate volume of fluid required for hydrotest? what are the safety precautions will do for doing hydrotest ? 

  

  

PIPING ISOMETRICS -Interview Questions

Which properties will you check in Piping Isometrics ?

Bill of Material 

Pipe routing w.r.t GAD 

Supporting Arrangements 

Details of insulation 

Hydrotest Pressure 

Painting specs 

Provision of went & drain and appropriate location 

Inch Meter & Inch Dia in Piping

In construction projects, both Inch Dia & Inch Metre are generally considered as units for measurement of quantum of piping job (mainly for welding/ Erection of piping/ hydrotest measurements). Former being denoted by ID of (phi)” or ” and inch metre by IM respectively; can be understood as below:

Part1:

Consider an 8 inch NB pipe of length say 100 metres. If there are 5 joints of this pipe to be welded, the quantum of this welding job is calculated as Pipe Dia (in inches) x No. of joints, i.e, 40 and denoted as 40 Inch dia (ID). 

In terms of IM, we say the quantum of job as Pipe Dia (in inches) x No. of Metres, i.e, 800 and denoted as 800 Inch Metre (IM).

Once again, ID is generally taken as unit of measurement (of quantum of job) for Welding, Radiography, DP test etc and are used as units for payment purposes as well.

IM is considered normally to define the quantum of Piping Erection job, Insulation (besides Metre cube) and its payment terms.

part 2

Inch dia in welding is nothing but the multiplication of size of joint x no of joints (of that size) which you need to weld during fabrication. Consider a Piping Spool , Say it has a pipe of 4″ (12 m long), with flange on one end and elbow on another. You are providing a branch connection of 2″ on it.

Welding inchdia in it is:

Total joints of 4″ in it = 1(pipe with flange) + 1(pipe with elbow) + 1 (it is optional – if a pipe purchased is of 6m length then you need to weld pipe to pipe to gain 12m length spool, but if pipe purchased is of 12m length then it is not required).

so inch dia = 4*3 = 12.

Now for branch connection of 2″ on mother pipe of 4″, you need to provide a weldolet, which will add one joint of 2″ size. so inchdia = 2*1 = 2

So Total inchdia involved in fabrication of that spool = 12 + 2 = 14inchdia.