LINE Pipes - Questions

ARAMCO QUESTIONS FOR API LINE PIPE 1

State difference between Defect and Imperfection / indication. Defect is a rejectable. Imperfection or indication is not a rejectable and which size exceeding the applicable standard is rejectable.

2

What is jointer in API? Two pipes welded or coupled together are called Jointer.

3

What are the processes of Manufacturing Steel? Open-hearth furnace, Basic oxygen furnace and Electric arc furnace

4

State two NDT methods for ERW Pipes. UT and EMI

5

State two NDT methods for SAW Pipes. UT and RT

6

In pipe diameter indicates i) Outside diameter ii) Inside diameter dimensions. i)Outside diameter

7

For coupling diameter indicates i) Outside diameter ii) Inside diameter dimensions. ii)Inside diameter

8

What is the maximum imperfection allowable in API? Max.12.5% of wall thickness

9

Which standard is followed for threads in API pipe? API 5B

10

What % of pipes for hydro test in casings & tubing’s 100%

11

How do you measure straightness? By using piano wire held at two ends and side of the pipe with the same size support pieces and the deviation measured should not exceed .2% of the total length.

12

IS the ASTM wants pipe to be weighed – True or False? True

13

Hydro test Pressure for API Line Pipe is 5 seconds which irrespective of size – True or False. False

14

Hydro test can be done after cold expansion in API pipe – True or False. True

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What are the dimensions to be checked on pipe? 1. Wall thickness 2. Out side Diameter 3. Straightness 4. Total Length 5. Squareness 6. Ovality Name any three visual defect found on pipes 1. Dent 2. Bead Offset 3. Arc Burn What indicates the last two digit x in material represents in API. Min. Yield strength requirement of plate/Coil

19

While welding which joint should be welded first a) Long seam welding b) circum welding a)Long Seam welding

20

What Mechanical property do you get in DWTT? Fracture Toughness

21

While measuring pipe length, coupling length is considered? No

22

Mention 3 API standards related to Line Pipe? API 5L - Line Pipe Specification API 5 CT – Specification for Casing and Tubing API 5D – Specification for Drill Pipe

23

Two API Standards for Seamless Pipes. API 5 CT – Specification for Casing and Tubing API 5D – Specification for Drill Pipe

24

Which API Spec is covers for BELL and SPIGOT Joint? API 5L

25

Two Physical attributes in Flattening test? Weld area Ductility Weld Brittleness

26

Minimum yield strength value for X42 grade. X 42 – 42100 PSI (As per API 5L 44th Edition)