API 5CT Casing pipe ,American Petroleum Institute API Specification 5CT/ ISO 11960:2001

API 5CT Casing Pipes

Table C.61—Summary of NDE methods for seamless and the body of welded pipe

Grade	Visual inspection (see 10.14)	Wall thickness determination	Ultrasonic inspection	Flux leakage inspection	Eddy current inspection	Magnetic particle inspection a
1	2	3	4	5	6	7
H40, J55 K55, N80 Type 1	R	N	N	N	N’	N
N80Q, L80 C95, M65	R	R	A	A	A	A
P110	R	R	A	A	A	NA
C90, T95, Q125	R	R	C	B	B	B
N = not required R = required A = one method or any combination of methods shall be used B = at least one method shall be used in addition to ultrasonic inspection to inspect the outside surface C = ultrasonic inspection shall be used to inspect the outside and inside surfaces NA = not applicable
a MPI is permitted for end-area inspection. MPI is permitted for pipe body outside-surface inspection in combination with other methods of pipe body inspection. ‘

Table C.62—Acceptance (inspection) levels

Grade		External imperfection		Internal imperfection
Grade		Longitudinal	Transverse	Longitudinal	Transverse
1		2	3	4	5
N80Q, M65, L80, C95		L4	一	L4	—
P110to A.9 (SR16)		L4	L4	L4	L4
P110		L2	L2	L2	L2
P110 to A.9 (SR16) and A.2 (SR2)		L2	L2	L2	L2
C90	UT	L2	L2	L2	L2
T95-Q125	2nd method	L2	L2	—	—
Weld seam
P110, Q125		L2	N	L2	N
All other grades		L3	N	L3	N
N = not required; Lx = acceptance (inspection) level.

Table C.63一Artificial reference indicators

a Depth as a percent of specified wall thickness. The depth tolerance shall be 士 15 % of the calculated notch depth with a minimum

notch depth of 0,3 mm ± 0,05 mm.

b Drilled hole diameter (through the pipe wall) shall be based on the drill bit size.

Table C.64—Size of stamp markings

Table C.65一Grade colour codes

Grade		Number and colour of bands for pipe and pup-joints & 1,8 m	Colour(s) for coupling
	Tvpe		Entire coupling	Bandfs)
1	2	3	4	5
H40		None or black band at the manufacturer’s ootion	None	Same as for oiDe
J55 tubing		One bright green	Bright green	None
J55 casing		One bright green	Bright green	One white
K55		Two briqht areen	Briaht areen	None
M65		One bright qreen, one blue	M65 pipe uses L80 Type 1 couplings
N80	1	One red	Red	None
N80	Q	One red, one briqht qreen	Red	Green
L80	1	One red, one brown	Red	One brown
L80	9Cr	One red, one brown, two vellow	Red	Two vellow
L80	13Cr	One red, one brown, one vellow	Red	One vellow
C90	1	One purple	Purple	None
C90	2	One purple, one vellow	Purple	One vellow
T95	1	One silver	Silver	None
T95	2	One silver, one vellow	Silver	One vellow
C95		One brown	Brown	None
P110		One white	White	None
Q125	1	One oranqe	Oranqe	None
Q125	2	One oranqe, one vellow	Oranqe	One vellow
Q125	3	One oranae, one areen	Oranae	One areen
Q125	4	One oranae, one brown	Oranqe	One brown

Table C.66—Thread type markings