1. PRESENTED BY
MOGEKWU CHINYE KELVIN
VENUE
HAVILAH ENERGY CONFERENCE ROOM

2.  INTRODUCTION
 HEALTH AND SAFETY
 VISUAL IDENTIFICATION OF
CASING/TUBULARS
 API GRADES OF CASING
 VISUAL INSPECTION EQUIPMENT CHECK LIST
 VISUAL INSPECTION PROCESS
 TYPES OF CONNECTION
 DRIFTING
 VISUAL IDENTIFICATION OF THREADS
 THE END
 REFRESHMENT

3.  API-AMERICAN PETROLEUM INSTITUTE
 CR-CHROME
 EU-EXTERNAL UPSET
 FGL-FIBER GLASS LINING
 IU-INTERNAL UPSET
 NU-NON UPSET
 SLHT-SEAL LOCK HIGH TORQUE
 TPI-THREAD PER INCH

4. Oil country tubular goods form the bases of
well construction, planning and budget. To that
effect, the quality and efficiency of casing and
Tubular has to be ascertained with a proper
Identification and inspection process.
Visual Thread Inspection is the use of tools and
techniques to visually check for thread damage
which includes pitting, burr and galling.

5.  At stonewall Tech Nigeria Limited, we promote
HSE culture as our core practice in operation
handling and delivery.
 We Observe our client company life saving rules
in Health and safety.
 Use of Tool Box talk as a key tool before
commencement of operation.
 Use of 5x5 Rules During accident or near miss.

6. Casing and Tubing can be identified using the
following characteristics.
 Dimensions
 Coupling Stencil
 Body Stencil
 Colour Codes
 Thread pattern/profile

7. Casing and
Tubing come in
the following
range:
Range 1 16-25
Range 2 26-34
Range 3 34+
Table source: Pan Meridian Tubular

8. This is a pictorial view of
a coupling with the
following stencil:
 5CT- API Specification.
 3/3- Date of
manufacture.
 HTNO- Heat number
 Vam Top- Brand of
Vallorec
 Colour Code- Violet.

9. This is a pictorial view of a Pipe Body Stencil
 TSD- Tenaris Sydeca
 9 ⅝-Pipe Diameter
 0117- API licence number
 Po- Purchase Order Number
 44.15- pipe Length
 SF-Special End finish

10. N80.1
-Red Coupling
-1 Strip Red band on Body
L80.1
-Red Coupling with a brown band
-Pipe Body with Red and Brown
Band
L80 13 CR
-Red Coupling with a yellow band
-pipe body with red, brown and
yellow band.
-13% Chromeage
J55
-Bright Green coupling with white
stripe
-pipe body with bright green Band

11. Premium connections comes with their own thread patterns/connection.
This is because most of these patterns are patented under API license.
Below are various thread profiles which comes in various patterns

12.  API standardized several grades of steel that
have different chemical content, manufacture
processes, and heat treatments, and
therefore different mechanical properties.
 API organized these tubing grades into
three groups which include:
 Group 1 is for all tubing in grades H40, J55,
and N80.
 Group 2 is for restricted-yield tubing grades
L80, C90, and T95.
 Group 3 is for high-strength tubing in
seamless grade P110. The API grade letter
designation was selected arbitrarily to
provide a unique name for various steels.
Numbers in the grade designation indicate
the minimum yield strength of the steel in
thousand psi. API defines the yield strength
as the tensile stress required to produce a
specific total elongation per unit length on a
standard test specimen
Table source: Heriot watt Drilling Engineering Handbook

13.  T&C – Threaded and Coupled
 LT&C – Long Thread and Coupled
 ST&C – Short Thread and Coupled
 BTC – Buttress Thread
 Integral Connection
 External Offset
 Internal Offset
 None Upset
 Extreme Line Connection
Source:API 5CT Manual

14. Threaded and Coupled
Integral Connector
Integral joint tubing has
external thread at on end and
internal thread at the other
end. This oil pipe can be
connected without the use of
couplings.
The threaded and
coupled has a coupling
which is box by box ready
for make up for two joints

15. EU or external upset
strong connection, full
opening,
clearance problems
IU or internal upset –
moderately strong
connection, reduced
opening, good
external clearance
NU or non-upset
– weak
connection, full
opening, good
external clearance

16. Black Crest
Full Crest
Seal Nose
Seal Shoulder

17. SIMILARITY
-Both connection have
same number of black
crest
-They are both Designed
with higher sealing
capability.
-They are both used in
areas with sour Gas.
DIFFERENCE DIFFERENCE
-The FGL has double seal
nose
-Seal Nose stand at
Angel 90°
-silent start off and
silent run off
-6 TPI
-broader seal nose
-SLHT has a single seal nose
-seal nose bevelled forward at
75°
-Loud Start off and silent run
off
-10 TPI
-Shorter seal nose

18.  SAFETY KIT
 PIPE WRENCH
 CHAIN THONG
 DRIFT MANDREL
 MEASURING TAPE/ DIGI-TALLY
 WIRE BRUSH
 CLEANING BRUSH
 AIR COMPRESSOR/PRESSURE WASH
 MAGNIFING LENS
 THREAD COMB
 THREAD GUAGE
 RAGS
 SOLVENT
 TALLY SHEET
 DRIFT CHART
 THREAD COMPOUND
 WHITE PAINT
 RED PAINT
 PAINT BRUSH

19.  Lay Out casings
 Break Thread Protectors, Box and Pin.
 Run Drift from Box to Pin with API 5CT Certified Drift
Mandrel.
 Use compressed air to blow casing from box to pin, in
other to remove scales and debris.
 Wash threads with Solvent and cleaning brush, and
then use wire brush for washing threads with little
rust.

20.  Clean threads with Rag or soft foam and allow to dry.
 Inspect threads, Box and Pin by running your fingers round
the threads gently with special concentration on seal in other
to check for any possible damage.
 Take measurement of casing and record on a tally sheet.
 Mark casing that pass visual test with a white paint and red
paint for the ones that fail test.
 Apply Thread compound on threads and close with thread
protectors.
 Assemble tools with your tool checklist

21. Galled thread
Pitting on thread
Flag off Damaged thread

22. Drifting or Rabbit involves running a drift mandrel
from the box end of a casing or tubular, to check
for any
1. possible restriction
2. Rusty Flakes that has occurred as a result of
internal corrosion
A restriction means that the original shape of pipe
has been altered and therefore will not be
suitable for purpose.
In visual inspection, it is suitable to use:
 Full Drift
 End Drift

23. Photo Credit: Symetec Steel

24.  Galling in connection
 Improper Make-up (misalignment, dirt, Over
thronging, too little lubrication).
 Fatigue Cracking
 Corrosion

25. THE END