+8615674993216
sales@forever-steels.com
English
العربية
API 5CT casing dimensions are identified by casing outside diameter and nominal weight, but procurement decisions normally require additional fields: wall thickness, nominal inside diameter, drift diameter, end finish and connection. Nominal ID describes pipe-body geometry; drift diameter defines the minimum verified passage for the applicable drift mandrel.
Buyers preparing a casing inquiry can also review Forever Steel's API 5CT casing pipe supply page for available grades, connection options, inspection requirements and quotation support.
Database overview: dimensional and grade fields should support search, comparison and RFQ preparation.
The working dataset below covers 13 table sections and 14 visible OD families from 4 1/2 in through 20 in, with multiple nominal-weight lines where shown in the supplied benchmark. Values are displayed as USC / metric. The final column adds the benchmark's row-level common-grade labels so the web prototype can support grade filtering; these labels are not a governing API applicability table or a Forever Steel stock commitment.
|
Casing OD |
Nom. wt |
Wall t |
Nominal ID |
Drift |
STC coupling OD |
Reference grades* |
|
4.500 / 114.30 |
9.50 / 14.14 |
0.205 / 5.21 |
4.090 / 103.89 |
3.965 / 100.71 |
4.750 / 120.65 |
J55, K55 |
|
4.500 / 114.30 |
10.50 / 15.63 |
0.224 / 5.69 |
4.052 / 102.92 |
3.927 / 99.75 |
4.750 / 120.65 |
J55, K55, N80 |
|
4.500 / 114.30 |
11.60 / 17.26 |
0.250 / 6.35 |
4.000 / 101.60 |
3.875 / 98.42 |
4.750 / 120.65 |
N80, L80, P110 |
|
4.500 / 114.30 |
13.50 / 20.09 |
0.290 / 7.37 |
3.920 / 99.57 |
3.795 / 96.39 |
4.750 / 120.65 |
N80, L80, P110 |
|
4.500 / 114.30 |
15.10 / 22.47 |
0.337 / 8.56 |
3.826 / 97.18 |
3.701 / 94.01 |
4.750 / 120.65 |
N80, P110, C110 |
|
5.000 / 127.00 |
11.50 / 17.11 |
0.220 / 5.59 |
4.560 / 115.82 |
4.435 / 112.65 |
5.200 / 132.08 |
J55, K55 |
|
5.000 / 127.00 |
13.00 / 19.35 |
0.253 / 6.43 |
4.494 / 114.15 |
4.369 / 110.97 |
5.200 / 132.08 |
J55, N80, L80 |
|
5.000 / 127.00 |
15.00 / 22.32 |
0.296 / 7.52 |
4.408 / 111.96 |
4.283 / 108.79 |
5.200 / 132.08 |
N80, L80, P110 |
|
5.000 / 127.00 |
18.00 / 26.79 |
0.362 / 9.19 |
4.276 / 108.61 |
4.151 / 105.44 |
5.200 / 132.08 |
N80, P110, C110 |
|
5.500 / 139.70 |
14.00 / 20.83 |
0.244 / 6.20 |
5.012 / 127.30 |
4.887 / 124.13 |
5.750 / 146.05 |
J55, K55 |
|
5.500 / 139.70 |
15.50 / 23.07 |
0.275 / 6.99 |
4.950 / 125.73 |
4.825 / 122.55 |
5.750 / 146.05 |
J55, N80 |
|
5.500 / 139.70 |
17.00 / 25.30 |
0.304 / 7.72 |
4.892 / 124.26 |
4.767 / 121.08 |
5.750 / 146.05 |
N80, L80, P110 |
|
5.500 / 139.70 |
20.00 / 29.76 |
0.361 / 9.17 |
4.778 / 121.36 |
4.653 / 118.19 |
5.750 / 146.05 |
N80, L80, P110, C110 |
|
5.500 / 139.70 |
23.00 / 34.23 |
0.415 / 10.54 |
4.670 / 118.62 |
4.545 / 115.44 |
5.750 / 146.05 |
P110, C110, Q125 |
|
6.625 / 168.27 |
20.00 / 29.76 |
0.288 / 7.32 |
6.049 / 153.64 |
5.924 / 150.47 |
7.390 / 187.71 |
J55, K55, N80 |
|
6.625 / 168.27 |
24.00 / 35.72 |
0.352 / 8.94 |
5.921 / 150.39 |
5.796 / 147.22 |
7.390 / 187.71 |
N80, L80, P110 |
|
6.625 / 168.27 |
28.00 / 41.67 |
0.417 / 10.59 |
5.791 / 147.09 |
5.666 / 143.92 |
7.390 / 187.71 |
N80, L80, P110, C110 |
|
6.625 / 168.27 |
32.00 / 47.62 |
0.475 / 12.06 |
5.676 / 144.17 |
5.550 / 140.97 |
7.390 / 187.71 |
P110, C110, Q125 |
|
7.000 / 177.80 |
17.00 / 25.30 |
0.231 / 5.87 |
6.538 / 166.07 |
6.413 / 162.89 |
7.656 / 194.46 |
J55, K55 |
|
7.000 / 177.80 |
20.00 / 29.76 |
0.272 / 6.91 |
6.456 / 163.98 |
6.331 / 160.81 |
7.656 / 194.46 |
J55, N80, L80 |
|
7.000 / 177.80 |
23.00 / 34.23 |
0.317 / 8.05 |
6.366 / 161.70 |
6.241 / 158.52 |
7.656 / 194.46 |
N80, L80, P110 |
|
7.000 / 177.80 |
26.00 / 38.69 |
0.362 / 9.19 |
6.276 / 159.41 |
6.151 / 156.24 |
7.656 / 194.46 |
N80, L80, P110 |
|
7.000 / 177.80 |
29.00 / 43.16 |
0.408 / 10.36 |
6.184 / 157.07 |
6.059 / 153.90 |
7.656 / 194.46 |
N80, P110, T95, C110 |
|
7.000 / 177.80 |
32.00 / 47.62 |
0.453 / 11.51 |
6.094 / 154.79 |
5.969 / 151.61 |
7.656 / 194.46 |
P110, T95, C110, Q125 |
|
7.000 / 177.80 |
35.00 / 52.09 |
0.498 / 12.65 |
6.004 / 152.50 |
5.879 / 149.33 |
7.656 / 194.46 |
P110, C110, Q125 |
|
7.625 / 193.67 |
24.00 / 35.72 |
0.300 / 7.62 |
7.025 / 178.44 |
6.900 / 175.26 |
8.500 / 215.90 |
J55, N80 |
|
7.625 / 193.67 |
26.40 / 39.29 |
0.328 / 8.33 |
6.969 / 177.01 |
6.844 / 173.84 |
8.500 / 215.90 |
N80, L80 |
|
7.625 / 193.67 |
29.70 / 44.20 |
0.375 / 9.52 |
6.875 / 174.62 |
6.750 / 171.45 |
8.500 / 215.90 |
N80, L80, P110 |
|
7.625 / 193.67 |
33.70 / 50.15 |
0.430 / 10.92 |
6.765 / 171.83 |
6.640 / 168.66 |
8.500 / 215.90 |
N80, P110, T95 |
|
7.625 / 193.67 |
39.00 / 58.04 |
0.500 / 12.70 |
6.625 / 168.27 |
6.500 / 165.10 |
8.500 / 215.90 |
P110, C110, Q125 |
|
8.625 / 219.07 |
24.00 / 35.72 |
0.264 / 6.71 |
8.097 / 205.66 |
7.972 / 202.49 |
9.625 / 244.47 |
J55, K55 |
|
8.625 / 219.07 |
28.00 / 41.67 |
0.304 / 7.72 |
8.017 / 203.63 |
7.892 / 200.46 |
9.625 / 244.47 |
J55, K55, N80 |
|
8.625 / 219.07 |
32.00 / 47.62 |
0.352 / 8.94 |
7.921 / 201.19 |
7.796 / 198.02 |
9.625 / 244.47 |
N80, L80 |
|
8.625 / 219.07 |
36.00 / 53.57 |
0.400 / 10.16 |
7.825 / 198.75 |
7.700 / 195.58 |
9.625 / 244.47 |
N80, L80, P110 |
|
8.625 / 219.07 |
40.00 / 59.53 |
0.450 / 11.43 |
7.725 / 196.21 |
7.600 / 193.04 |
9.625 / 244.47 |
N80, L80, P110 |
|
8.625 / 219.07 |
44.00 / 65.48 |
0.500 / 12.70 |
7.625 / 193.67 |
7.500 / 190.50 |
9.625 / 244.47 |
P110, C110 |
|
8.625 / 219.07 |
49.00 / 72.92 |
0.557 / 14.15 |
7.511 / 190.78 |
7.386 / 187.60 |
9.625 / 244.47 |
P110, C110, Q125 |
|
9.625 / 244.47 |
32.30 / 48.07 |
0.312 / 7.92 |
9.001 / 228.63 |
8.845 / 224.66 |
10.625 / 269.88 |
J55, K55 |
|
9.625 / 244.47 |
36.00 / 53.57 |
0.352 / 8.94 |
8.921 / 226.59 |
8.765 / 222.63 |
10.625 / 269.88 |
J55, N80, L80 |
|
9.625 / 244.47 |
40.00 / 59.53 |
0.395 / 10.03 |
8.835 / 224.41 |
8.679 / 220.45 |
10.625 / 269.88 |
N80, L80, P110 |
|
9.625 / 244.47 |
43.50 / 64.74 |
0.435 / 11.05 |
8.755 / 222.38 |
8.599 / 218.41 |
10.625 / 269.88 |
N80, L80, P110 |
|
9.625 / 244.47 |
47.00 / 69.94 |
0.472 / 11.99 |
8.681 / 220.50 |
8.525 / 216.53 |
10.625 / 269.88 |
N80, P110, T95, C110 |
|
9.625 / 244.47 |
53.50 / 79.62 |
0.545 / 13.84 |
8.535 / 216.79 |
8.379 / 212.83 |
10.625 / 269.88 |
P110, T95, C110, Q125 |
|
10.750 / 273.05 |
32.75 / 48.74 |
0.279 / 7.09 |
10.192 / 258.88 |
10.036 / 254.91 |
11.750 / 298.45 |
J55, K55 |
|
10.750 / 273.05 |
40.50 / 60.27 |
0.350 / 8.89 |
10.050 / 255.27 |
9.894 / 251.31 |
11.750 / 298.45 |
J55, N80 |
|
10.750 / 273.05 |
45.50 / 67.71 |
0.400 / 10.16 |
9.950 / 252.73 |
9.794 / 248.77 |
11.750 / 298.45 |
N80, L80, P110 |
|
10.750 / 273.05 |
51.00 / 75.90 |
0.450 / 11.43 |
9.850 / 250.19 |
9.694 / 246.23 |
11.750 / 298.45 |
N80, P110 |
|
10.750 / 273.05 |
55.50 / 82.59 |
0.495 / 12.57 |
9.760 / 247.90 |
9.604 / 243.94 |
11.750 / 298.45 |
N80, P110 |
|
11.750 / 298.45 |
42.00 / 62.50 |
0.333 / 8.46 |
11.083 / 281.51 |
10.925 / 277.50 |
12.750 / 323.85 |
J55, K55 |
|
11.750 / 298.45 |
47.00 / 69.94 |
0.375 / 9.52 |
11.000 / 279.40 |
10.844 / 275.44 |
12.750 / 323.85 |
J55, K55, N80 |
|
11.750 / 298.45 |
54.00 / 80.36 |
0.435 / 11.05 |
10.882 / 276.40 |
10.724 / 272.39 |
12.750 / 323.85 |
N80, L80, P110 |
|
11.750 / 298.45 |
60.00 / 89.29 |
0.489 / 12.42 |
10.772 / 273.61 |
10.616 / 269.65 |
12.750 / 323.85 |
N80, L80, P110 |
|
11.750 / 298.45 |
65.00 / 96.73 |
0.534 / 13.56 |
10.681 / 271.30 |
10.526 / 267.36 |
12.750 / 323.85 |
P110, C110 |
|
11.750 / 298.45 |
71.00 / 105.66 |
0.582 / 14.78 |
10.587 / 268.91 |
10.430 / 264.92 |
12.750 / 323.85 |
P110, C110, Q125 |
|
13.375 / 339.72 |
48.00 / 71.43 |
0.330 / 8.38 |
12.715 / 322.96 |
12.559 / 319.00 |
14.375 / 365.12 |
J55, K55 |
|
13.375 / 339.72 |
54.50 / 81.10 |
0.380 / 9.65 |
12.615 / 320.42 |
12.459 / 316.46 |
14.375 / 365.12 |
J55, K55, N80 |
|
13.375 / 339.72 |
61.00 / 90.78 |
0.430 / 10.92 |
12.515 / 317.88 |
12.359 / 313.92 |
14.375 / 365.12 |
K55, N80, L80 |
|
13.375 / 339.72 |
68.00 / 101.20 |
0.480 / 12.19 |
12.415 / 315.34 |
12.259 / 311.38 |
14.375 / 365.12 |
N80, L80, P110 |
|
13.375 / 339.72 |
72.00 / 107.15 |
0.514 / 13.06 |
12.347 / 313.61 |
12.191 / 309.65 |
14.375 / 365.12 |
N80, P110 |
|
16.000 / 406.40 |
65.00 / 96.73 |
0.375 / 9.52 |
15.250 / 387.35 |
15.062 / 382.57 |
17.000 / 431.80 |
J55, K55 |
|
16.000 / 406.40 |
75.00 / 111.61 |
0.438 / 11.13 |
15.124 / 384.15 |
14.936 / 379.37 |
17.000 / 431.80 |
K55, N80 |
|
16.000 / 406.40 |
84.00 / 125.01 |
0.495 / 12.57 |
15.010 / 381.25 |
14.822 / 376.48 |
17.000 / 431.80 |
K55, N80 |
|
18.625 / 473.07 |
87.50 / 130.21 |
0.435 / 11.05 |
17.755 / 450.98 |
17.567 / 446.20 |
Not listed |
J55, K55 |
|
20.000 / 508.00 |
94.00 / 139.89 |
0.438 / 11.13 |
19.124 / 485.75 |
18.936 / 480.97 |
Not listed |
J55, K55 |
|
20.000 / 508.00 |
106.50 / 158.49 |
0.500 / 12.70 |
19.000 / 482.60 |
18.812 / 477.82 |
Not listed |
J55, K55 |
|
20.000 / 508.00 |
133.00 / 197.93 |
0.635 / 16.13 |
18.730 / 475.74 |
18.542 / 470.97 |
Not listed |
K55, N80 |
*Reference grades are public-benchmark labels. They must be checked against the licensed API 5CT 11th Edition source, current addenda/errata, the required product type and Forever Steel's qualified supply range before they are presented as applicable or available.
API 5CT 11th Edition Addendum 1 states that the specification applies to H40, J55, K55, N80 (all types), L80 (all types), C90, R95, T95, P110, C110, C125 and Q125. This specification-wide scope does not mean every grade is valid, qualified or commercially available for every size, nominal weight, connection and service condition.
|
Grade family |
RFQ designation |
Specification status |
Buyer confirmation required |
|
H40 |
H40 |
Standard grade family |
Confirm the size/weight combination, end finish and current mill offer. |
|
J55 |
J55 |
Standard grade family |
Do not substitute K55 without purchaser agreement and a complete property review. |
|
K55 |
K55 |
Standard grade family |
Do not treat J55 and K55 as interchangeable solely because their grade numbers are close. |
|
N80 |
Exact N80 type |
All N80 types are within the stated scope |
State the exact type, heat-treatment route, connection and inspection requirements. |
|
L80 |
Exact L80 type |
All L80 types are within the stated scope |
State the exact type and separately verify metallurgy and service-environment requirements. |
|
C90 |
C90 |
Standard grade family |
Confirm project service qualification, heat treatment, hardness and supplementary requirements. |
|
R95 |
R95 |
Standard grade family |
Confirm the design basis, connection performance and mill availability. |
|
T95 |
T95 |
Standard grade family |
Confirm project service qualification, hardness controls and inspection evidence. |
|
P110 |
P110 |
Standard grade family |
High strength alone does not establish sour-service or connection suitability. |
|
C110 |
C110 |
Standard grade family |
Confirm the complete service envelope and applicable purchaser requirements. |
|
C125 |
C125 |
Added to the scope by Addendum 1 |
Confirm that the supplier has adopted the current addendum and can provide controlled evidence. |
|
Q125 |
Q125 |
Standard grade family |
Confirm connection, service environment, dimensional combination and qualified supply route. |
|
GRADE DECISION RULE Use three separate statuses in the live database: Standard scope means the grade family is named by API 5CT; Project qualified means the engineer has approved the exact grade/type for the load and service envelope; Supplier confirmed means Forever Steel has confirmed the exact size, weight, connection, quantity, inspection evidence and delivery route. |
|
Field |
Units |
Why it matters |
|
Size designation |
in / mm |
Primary commercial casing size |
|
Outside diameter |
in / mm |
Wellbore, coupling and handling clearance |
|
Nominal weight |
lb/ft / kg/m |
Identifies the standard casing line item |
|
Wall thickness |
in / mm |
Affects ID, weight and engineering calculations |
|
Nominal ID |
in / mm |
Describes nominal pipe-body bore |
|
Standard drift |
in / mm |
Defines the referenced passage acceptance |
|
Reference grade labels |
text |
Supports discovery and comparison; requires source and applicability review |
|
Exact grade and type |
text |
Captures the controlled RFQ designation rather than a broad grade family |
|
Grade status |
status |
Separates standard scope, project qualification and supplier confirmation |
|
Plain-end mass |
lb/ft / kg/m |
Supports material and logistics calculations |
|
T&C mass |
lb/ft / kg/m |
Supports threaded-and-coupled purchasing |
|
End finish |
text |
Identifies the intended connection route |
|
Data status |
status |
Separates standard reference from supplier confirmation |
|
VISIBLE DATABASE NOTICE A grade shown beside a size/weight row is a reference label, not proof that the combination is permitted, project-qualified or currently available. Confirm the governing standard edition, exact grade/type, connection, service requirements, inspection and special drift before ordering. |
A casing description such as 5 1/2 in x 17.0 lb/ft does not provide two alternative measurements of the same property. The first value identifies the casing size and outside-diameter family; the second identifies the nominal weight line. Together, they lead to the applicable wall thickness, nominal ID and drift values.
|
Field |
Practical meaning |
Common mistake |
|
Size designation |
Commercial casing size |
Treating it as the actual bore |
|
Outside diameter |
Nominal pipe-body OD |
Ignoring coupling OD in clearance checks |
|
Nominal weight |
Standard weight designation |
Treating it as exact shipment weight |
|
Wall thickness |
Nominal pipe-body wall |
Using it as guaranteed measured wall |
|
Nominal ID |
OD minus twice nominal wall |
Assuming every smaller tool will pass |
|
Drift diameter |
Specified passage acceptance |
Confusing standard and special drift |
|
T&C mass |
Threaded-and-coupled reference |
Comparing it with plain-end mass |
The purchase order should therefore identify more than '5 1/2-inch casing.' At minimum, state size, nominal weight, grade, end finish or connection, length range, quantity and governing API 5CT edition.
Nominal inside diameter is a geometric value based on nominal dimensions:
|
NOMINAL GEOMETRY Nominal ID = Nominal OD - 2 x nominal wall thickness |
That calculation does not represent the smallest measured bore at every point along a manufactured joint. Real pipe is subject to permitted dimensional variation, straightness conditions and local geometry within the governing acceptance requirements.
Drift testing answers a different question: can the specified mandrel pass through the casing bore over the required test path without obstruction?
For completion-tool clearance, plug placement or other passage-sensitive work, nominal ID alone is not an adequate acceptance criterion.
|
Field |
5 1/2 x 17.0 |
5 1/2 x 20.0 |
Selection effect |
|
Nominal OD |
5.500 in |
5.500 in |
External body envelope stays the same |
|
Nominal wall |
0.304 in |
0.361 in |
Heavier line has a thicker wall |
|
Nominal ID |
4.892 in |
4.778 in |
Available nominal bore is smaller |
|
Standard drift |
4.767 in |
4.653 in |
Passage acceptance is smaller |
Values are shown for interface and reading-method illustration. Validate the production database against the licensed governing standard and current corrections before publication or contractual use.
The same casing OD can have different wall thickness, nominal ID and drift clearance.
Changing nominal weight can therefore affect more than freight or pipe-body strength. A heavier casing line within the same OD family generally reduces the available bore and drift clearance.
Assume the preliminary program lists a tool with a maximum outside diameter of 4.70 in.
• Nominal ID: 4.892 in
• Referenced standard drift: 4.767 in
• Tool OD: 4.700 in
• Difference between drift and tool OD: 0.067 in
On dimensions alone, the tool is smaller than the referenced drift diameter.
• Nominal ID: 4.778 in
• Referenced standard drift: 4.653 in
• Tool OD: 4.700 in
• Tool OD exceeds the referenced drift diameter
The second option should not be accepted merely because the tool is smaller than the nominal ID. Its tool OD exceeds the referenced drift value.
This example is only a screening check. Final clearance review must also consider:
• Actual maximum tool OD, including protectors and accessories
• Connection or accessory restrictions
• Centralizers, packers, plugs and other running equipment
• Dogleg severity and well trajectory
• Scale, debris, deformation or post-installation restrictions
• Special-drift requirements and project operating clearance
• Engineer and tool-provider approval
|
DECISION RULE Use nominal ID for preliminary geometry review, but use the specified and verified drift requirement as the procurement acceptance basis for passage-sensitive equipment. |
These three terms should remain separate in the RFQ and inspection record.
|
Term |
What it represents |
Appropriate use |
|
Standard drift |
Standardized acceptance for the applicable product |
Normal API purchase when no different requirement applies |
|
Special drift |
A project-defined requirement agreed in the order |
Projects needing additional passage clearance |
|
Actual measured bore |
Measurements for a particular joint or mapped string |
Detailed operational planning and traceability |
Passing a standard drift test does not mean the entire bore equals the drift diameter. It means the pipe passed the specified drift acceptance procedure.
A special-drift request can affect manufacturing route, yield, inspection, price and delivery time. The buyer should state the required mandrel diameter, length, edge condition, test procedure and recording requirement.
'Casing weight' can refer to different values. This is a frequent source of quotation and logistics discrepancies.
The nominal weight is part of the standard casing item description. It helps identify the corresponding wall thickness and dimensional line.
Plain-end mass represents the calculated pipe-body mass before the effect of couplings and some end processing. It supports theoretical material and lifting calculations but should not automatically be treated as invoice weight.
A threaded-and-coupled joint includes connection-related mass and may be represented differently in standard tables, mill documentation or commercial schedules.
Actual bundle or shipment weight depends on joint lengths, quantity, couplings, protectors, packaging and the agreed weighing method.
|
QUOTATION CONTROL Ask suppliers to identify whether a stated kg/m or lb/ft value is the nominal weight designation, calculated plain-end mass, threaded-and-coupled nominal mass or actual scale weight. |
|
The database can help |
The database cannot |
|
Find wall thickness for a size and nominal weight |
Perform burst, collapse or tension design |
|
Compare nominal ID and drift |
Confirm combined-load capacity |
|
Screen preliminary tool clearance |
Establish sour-service suitability |
|
Convert USC and metric fields |
Select a grade from depth alone |
|
Prepare a clearer casing RFQ |
Confirm connection sealability |
|
Estimate theoretical pipe-body mass |
Confirm current mill stock |
|
Flag supplier-confirmation items |
Guarantee passage after installation |
Grade selection and well design must account for the complete load and service envelope. A higher nominal weight or higher-strength grade is not automatically the safer purchasing choice if bore, connection, corrosion or completion requirements are not satisfied.
The dimensions database supports selection and documentation; it does not replace engineering approval.
After selecting a database row, the page should generate an editable RFQ line rather than sending only the dimensions.
|
EXAMPLE RFQ OUTPUT API Spec 5CT, 11th Edition with applicable addenda and errata; casing, 5 1/2 in OD x 17.0 lb/ft nominal weight; [grade and type]; [manufacturing route]; [STC/LTC/BTC/named connection]; Range [2/3]; threaded and coupled; standard drift unless otherwise stated; quantity [joints/metres/tonnes]; marking, thread protectors, inspection documents and packing as specified in the attached requisition. |
|
RFQ field |
Buyer input required |
|
Well section |
Surface, intermediate, production casing or liner |
|
Grade and type |
Exact designation, not only a strength level |
|
Service environment |
H2S, CO2, chlorides, temperature and fluids |
|
Design loads |
Burst, collapse, tension and combined-load basis |
|
Connection |
STC, LTC, BTC or exact proprietary designation |
|
Drift |
Standard or fully defined special drift |
|
Length and quantity |
Range, restrictions, joints, length and tonnage |
|
Inspection |
NDT, hydrotest, drift, dimensions, threads and witness points |
|
Documentation |
MTC, reports, tally, release and traceability |
|
Packing |
Protectors, bundling and shipping marks |
The database should not preselect a grade or connection automatically. Those choices depend on the project's engineering and operating conditions.
A dimension page becomes commercially useful only when the selected values can be connected to shipment evidence.
|
Evidence |
What to verify |
|
Mill test certificate |
Edition, grade/type, heat, route and traceability |
|
Dimensional report |
OD, wall, length and project-specific checks |
|
Drift record |
Mandrel diameter/length, procedure, result and traceability |
|
Thread inspection |
Connection designation, gauge status and result |
|
Hydrostatic test |
Test basis, result and product traceability |
|
NDT report |
Method, coverage, acceptance basis and qualification |
|
Tally list |
Joint number, actual length, heat/lot and identity |
|
Packing evidence |
Protectors, bundling, markings and loading condition |
|
EVIDENCE BOUNDARY A photograph of a drift mandrel is not the complete drift record. The evidence should connect the verified mandrel and test result to the supplied product. |
|
Control field |
Page entry |
|
Governing reference |
API Specification 5CT |
|
Edition basis |
11th Edition, December 2023 |
|
Updates reviewed |
Addendum 1, May 2025; API errata through June 2026 |
|
Unit presentation |
Governing values plus controlled conversions |
|
Last technical review |
Insert actual review date before publication |
|
Technical reviewer |
Insert a real reviewer name and role |
|
Redistribution status |
Confirm before full database publication |
|
Supplier availability |
Confirm against the final RFQ |
API's current update register lists Errata 3 for the 11th edition in June 2026. The page owner should review the API update register before every database revision.
The 11th edition removed the former Product Specification Level terminology used in the 10th edition. New RFQs should not continue using 'API 5CT PSL1' or 'API 5CT PSL2' as if those were current 11th-edition product designations.
Casing size normally refers to the outside-diameter family. The inside diameter changes with wall thickness and nominal weight, so two casing items with the same size designation can have different IDs and drift diameters.
Not necessarily. Nominal weight identifies a standard casing line. Plain-end calculated mass, threaded-and-coupled mass and actual shipment weight may differ. The quotation should state which value is being used.
Nominal ID can support preliminary screening, but it should not be the only passage criterion. Review drift, the tool envelope, connections, accessories, well geometry and required operating clearance.
Special drift is a project-specific passage requirement different from the normal standard-drift route. It should define the mandrel diameter, length, test method and reporting requirement.
No. A standard dimensional combination is not proof of stock or current production availability. The supplier must confirm size, weight, grade, manufacturing route, connection, quantity and delivery schedule.
API 5CT 11th Edition Addendum 1 lists H40, J55, K55, N80 (all types), L80 (all types), C90, R95, T95, P110, C110, C125 and Q125. The applicable grade and exact type still depend on the product, design, service environment, connection and purchaser requirements.
No. API has stated that the 11th edition no longer references the former PSL designations. Specify the required grade, type, supplementary requirements, connection, inspection and service conditions directly.
1. API 5CT Casing and Tubing Complete Guide
2. Standard API Threads or Premium Connections: When Is STC, LTC, BTC, NUE, or EUE Not Enough?
3. API 5CT Pre-Shipment Inspection: Thread Gauging, Drift Test, Hydrotest, NDT and Tally Check
