Casing Pipe 7 ¾ (inch) Grade C90 Thickness 0.625 in (15,88 mm)
According to API 5L CT
image/svg+xml15,88 mm(7.625 in)(0.625 in)193.7 mm
Size Designation7 ¾ : Inches
Outside diameter7.625 Inches (193.7 mm)
GradeC90
Wall thickness0.625 inches (15,88mm)
Pipe Carateristics
Weight47.1 lb/ft (70,2kg/m)
Inside diameter6.375 inches (161,9mm)
Drift diameter6.25 inches (158,80mm)

Thread and coupling

Buttress

Outside dia. Regular– inches (–mm)
Outside dia. Special Clearance– inches (–mm)

Extreme-lines

Drift diameter– inches (–mm)
Outside diameter– inches (–mm)

Hydrostatic test pressure

Plain-end

STD3,0 ksi
Alt– ksi

Extreme-line

STD– ksi
Alt– ksi

Round thread

Court

STD– ksi
Alt– ksi

long

STD– ksi
Alt– ksi

Buttress

Regular

STD– ksi
Alt– ksi

Special Clearance

STD– ksi
Alt– ksi

CHEMICAL REQUIREMENTS(in %)

NL : no limit

C : casing

T: tubing

The carbon content for L 80 may be increased to 0.50 % maxi if the product is oil quenched.

No minimum tolerance if the wall thickness is less than 0.700 inches for C 90 grade.

The carbon content for C 95 may be increased to 0.55 % maxi if the product is oil quenched.

The molybdenum content for grade T 95–Type 1 may be decreased to 0.15 % minimum if the wall thickness is less than 0.700 inches.

The phosphorous is 0.020 % maximum and the sulfur is 0.010 % maximum for EW (electric weld, resistance or induction, without the addition of filler metal) grade P 110.

TENSILE REQUIREMENTS

S = seamless

EW = electric weld (resistance or induction) without the addition of filler metal.

QT = quenched and tempered

  • The minimum elongation in 2 in. (50.8 mm) shall be that determined by the following formula (inch-pound units) :

 

\(e = 625,000 * { A^{0.2}\over U^{0.9}}\)

where
e = minimum elongation in 2 in. (50.8 mm) in percent to nearest 1/2 percent.
A = cross-sectional area of the tensile test specimen in sq. in.
U = specified minimum ultimate tensile strength in ksi.

  • Full length normalized (N), normalized and tempered (NT), or quenched and tempered (QT), at manufacturer’s option or if so specified on the purchase order.

N : normalized
T : tempered
Q : quenched

  • Types 9 Cr and 13 Cr may be air quenched

TOLERANCES

CONNECTIONS

Casing pipe

API ROUND THREAD

The pipe is threaded at both ends to have a thread pin the pipes are joined together by means of a coupling. To API specifications, short or long threads with corresponding couplings are available. Long thread casing can transmit higher axial loads than short thread casing.

API EXTREME-LINE

Pipes completely differ from the 2 previous types. Endsof pipe are slightly upset where box and pin threads are. In addition, the bottom of the box thread is provi- ded with a machined area where the threaded pin will be pressed during make-up. The thread profile is trapezoidal.

API BUTTRESS

Theconnectingsystemisidenticaltoroundthread.Ins- tead of the «round thread», there is a «buttress» type threadwhichallowsthe transmission of veryhigh axialloads.

 

Tubing pipe

COUPLING JOINT

Threaded and coupled API tubing is externally threa- dedonbothendsofanonupset orupset pipe. Single lengthsarejoinedbyaninternallythreadedcoupling. CouplingO.D. canbe«regular» or «special» clea- rance (reduced O.D.). Tubingthread is API round

Nota :special bevel couplings can be furnished for non-upset and upset tubing, as specified on purchase

INTEGRAL JOINT

IntegraljointAPItubingisexternallythreadedoninter- nal upset pipeendandinternally threadedonexternal upset pipe end.

marking casing – tubing

Note1

GRADEMARKING

H40

H

J55

J

K55

K

M 65

M

N80

N

P110

P

L80type1

L

L80type9 Cr

L9

L80type13Cr

L13

C90type1

C90– 1

C90type2

C90– 2

C95

C95

T95type1

T1

T95type2

T2

Q125type1

Q1

Q125type2

Q2

Q125type3

Q3

Q125type4

Q4

Note2

PROCESS O MANUFACTURE

seamless:S

electric welded :E

Note3

TESTPRESSURE

StandardtestpressureST

Alternate testpressureAT

Agreedonpressuregreater thanstandard testpressureHP

Test pressureis3000psiandthestandardtestpressureisgreaterthan3000psi.3K

Note4 TYPEOF THREAD

casing

Short round threadLong round thread

Buttressthread

Extremeline

STCLCBC

XC

tubing

Nonupset

ExternalupsetIntegraljoint

NU

EUIJ

 

Note 5
COLOR IDENTIFICATION

marking : casing – tubing

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