1. Review API connection Vs Premium
By Hendra Wisanggeni

2. OCTG Connections new nomenclature
ISO 11960:2004/API Std. 5B Propritary
connections connections
Tubing EU Tubing MTC
NU IJ
IJ MIJ
Casing STC Casing MTC
LC SLHP
BC IFJ
XC MIJ

3. Casing & Tubing connections classification
API spec 5B
Premium
Tenaris Family
Hunting Intl
Round thread
Buttress thread
Extreme line
Tenaris Blue family
Antares family
NKK family
SEC
Atlas Bradford
Boss
HSLA
Multiseal/two step
VAM Family

4. API Connections Round thread Buttress thread Extreme Line
External Upset End

5. API 8Round Short Thread J values
OD ppf Short thread
J values
4 ½” ”
5” ”
7” ”
8 5/8” ”
10 ¾” ”
Other labels 0.500”
Short round thread
J value

6. Round thread API standard 5B
Triangle stamp for OD 16” to 20”
Tubing: EU (1.050” /2”)
NU (1.050” /2”)
IJ (1.315” ”)
Casing: STC (4 1/2” - 20”)
LC (4 1/2” - 20”)

7. between thread crests and roots
API Round thread Fn Fx
30° Ft
Small helical voids
between thread crests and roots

8. API 8 Round jump-out failure mechanism
Frequent during casing over-pull
Final pin ID lower than original ID
Pin crests deformation
Box crests deformation

9. API Round thread Advantages/Kelebihan: - Easy to manufacture
(mudah diproduksi)
- Easy running
(mudah dipasang)
- Acceptable sealability response at low pressure
(mampu sekat/seal untuk tekanan rendah)
- Well known
(sudah dikenal)
Disadvantages/Kelemahan:
- Poor tension resistance
(ketahanan thd beban tarik lemah)
- Poor sealability for medium and high pressure
(mampuan sekat/seal untuk tekanan tinggi dan tingi lemah)

10. Premium Connections - Features
Metal to Metal Seal
BOX
PIN
Thread Form
Torque Shoulder

11. Area kritis gangguan aliran yang menyebabkan turbulence API Turbulence
FLUID FLOW
Premium
streamline
FLUID FLOW

12. Typical Premium Connection
T&C

13. Premium connections advantages
Premium thread form
Tension/Tarik
Compression/Tekan
Bending/Tekuk
Improved seal performance
Metal-to-metal seals
Teflon seals
Multiple seals
Torque shoulders
Torsional strength
Positive makeup position
Stored torque prevents back-off
Repeated make-up without performance degradation
Possible to repair as many as possible, no need total reprocess

14. Premium connections advantages
Relatively more expenses in term of unit price
Need good support such as running assistance and work shop for repair