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MOGEKWU CHINYE KELVIN
HAVILAH ENERGY CONFERENCE ROOM
HEALTH AND SAFETY
VISUAL IDENTIFICATION OF
API GRADES OF CASING
VISUAL INSPECTION EQUIPMENT CHECK LIST
VISUAL INSPECTION PROCESS
TYPES OF CONNECTION
VISUAL IDENTIFICATION OF THREADS
API-AMERICAN PETROLEUM INSTITUTE
FGL-FIBER GLASS LINING
SLHT-SEAL LOCK HIGH TORQUE
TPI-THREAD PER INCH
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.
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.
Casing and Tubing can be identified using the
Tubing come in
Range 1 16-25
Range 2 26-34
Range 3 34+
Table source: Pan Meridian Tubular
This is a pictorial view of
a coupling with the
5CT- API Specification.
3/3- Date of
HTNO- Heat number
Vam Top- Brand of
Colour Code- Violet.
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
-1 Strip Red band on Body
-Red Coupling with a brown band
-Pipe Body with Red and Brown
L80 13 CR
-Red Coupling with a yellow band
-pipe body with red, brown and
-Bright Green coupling with white
-pipe body with bright green Band
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
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,
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
T&C – Threaded and Coupled
LT&C – Long Thread and Coupled
ST&C – Short Thread and Coupled
BTC – Buttress Thread
Extreme Line Connection
Source:API 5CT Manual
Threaded and Coupled
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
The threaded and
coupled has a coupling
which is box by box ready
for make up for two joints
EU or external upset
strong connection, full
IU or internal upset –
NU or non-upset
-Both connection have
same number of black
-They are both Designed
with higher sealing
-They are both used in
areas with sour Gas.
-The FGL has double seal
-Seal Nose stand at
-silent start off and
silent run off
-broader seal nose
-SLHT has a single seal nose
-seal nose bevelled forward at
-Loud Start off and silent run
-Shorter seal nose
MEASURING TAPE/ DIGI-TALLY
AIR COMPRESSOR/PRESSURE WASH
Lay Out casings
Break Thread Protectors, Box and Pin.
Run Drift from Box to Pin with API 5CT Certified Drift
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
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
Assemble tools with your tool checklist
Pitting on thread
Flag off Damaged thread
Drifting or Rabbit involves running a drift mandrel
from the box end of a casing or tubular, to check
1. possible restriction
2. Rusty Flakes that has occurred as a result of
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:
Photo Credit: Symetec Steel
Galling in connection
Improper Make-up (misalignment, dirt, Over
thronging, too little lubrication).