Oil Country Tubular Goods


Line pipesseamless steel tubes for transportation of flammable fluids are mainly set for high pressure pipelines to deliver gases, oil and other flammable fluids in the mining, chemical and energy industry.

Tubes for casing and tubing are manufactured using the hot rolling process. Semi-finished product used for these tubes is continuously cast blooms. Tubes for casing and tubing are used in the mining industry to obtain crude oil and natural gas.

Oil Country Tubular Goods


Sizes of tubes

for transportation of flammable substances – line pipes

OUTER DIAMETER (OD)10,3 – 114,3 mm
(0,405 – 4,5 inch)
WALL THICKNESS (WT)1,7 – 13,5 mm
(0,068 – 0,531 inch)
EUROPEAN STANDARDSDIN 2448,
EN ISO 3183,
ISO 4200
AMERICAN STANDARDSAPI 5L,
ASME B 36.10M

for casing and tubing

OUTER DIAMETER (OD)26,67 – 114,3 mm
(1,05 – 4,5 inch)
WALL THICKNESS (WT)2,87 – 9,65 mm
(0,113 – 0,38 inch)
Tubes are supplied as hot rolled, unless a non-standard diameter is required.
AMERICAN STANDARDSAPI 5CT
Dimensional standard SIZES (OD x WT) Dimensional table
APIAPI 5CT26.7 x 2.87 – 114.3 x 8.56 mm [1.050 x 0.113 – 4.500 x 0.337 in]
Dimensional standard SIZES (OD x WT) Dimensional table
DIN244810.2 x 0.5 – 139.7 x 16.0 mm
UNI708810.2 x 0.5 – 139.7 x 16.0 mm
UNI728710.2 x 0.5 – 139.7 x 16.0 mm
APIAPI 5L10.3 x 1.7 – 114.3 x 13.49 mm [0.405 x 0.068 – 4.500 x 0.531 in] [1/8 – 4 1/2 NSD]
EN ISOISO 318310.2 x 0.5 – 139.7 x 16.0 mm

The types of steel for tubes

for casing and tubing

API 5CTH40, J55, K55 and N80.

Steel is made in the electric arc furnace and they are fully killed. Tubing is delivered according of requirements PSL 1. Level PSL 2 and PSL 3 (Annex H of API 5 CT) as per agreement.

for line pipe

EN ISO 3183PSL1L210, L245, L290, L320, L360, L390, L415 a L450.
PSL2L360NE alebo X52NE, L415NE alebo X60NE.
API 5LPSL1A, B, X42, X46, X52, X56, X60 a X65.

Standard TDC Steel grade (open product)
APIAPI 5CT
APIAPI 5CT
APIAPI 5CT
APIAPI 5CT
Standard TDC Steel grade (open product)
APIAPI 5L – PSL1
APIAPI 5L – PSL1
APIAPI 5L – PSL1
APIAPI 5L – PSL1
APIAPI 5L – PSL1
APIAPI 5L – PSL1
APIAPI 5L – PSL1
APIAPI 5L – PSL1
UNI7287
EN ISO3183 – PSL2
EN ISO3183 – PSL1
EN ISO3183 – PSL1
EN ISO3183 – PSL1
EN ISO3183 – PSL1
EN ISO3183 – PSL1
EN ISO3183 – PSL1
EN ISO3183 – PSL1
EN ISO3183 – PSL2
EN ISO3183 – PSL2
EN ISO3183 – PSL2
DIN2470-2/17172
DIN2470-1/1629
DIN2470-2/17172
DIN2470-2/17172
UNI7088
DIN2470-2/17172
EN ISO3183 – PSL1
UNI7088
DIN2470-2/17172
DIN2470-2/17172

Length of tubes

for casing and tubing


Values for tubing – pumping tubes:

Group 1:6,10–7,32 m (20–24 ft)
Skupina 2:8,53–9,75 m (28–32 ft)
Group 3:11,58–12,80 m (38–42 ft)

Values for casing:

Skupina 1:4,88–7,62 m (16–25 ft)
Group 2:7,62–10,36 m (25–34 ft)
Group 3:10,36–14,64 m (34–48 ft)

Ends of tubes

The ends are vertical to the longitudinal axis and are without burrs.
The ends are vertical to the longitudinal axis and are without burrs.

Casing and tubing

Deburring applies to:

Deburring
  • Tube OD: 26,7 – 114,3 mm
  • Tube WT: 3,2 – 12,5 mm
  • Tube lengths: 4 – 13 m
  • Deburring angle, α (alpha): 30°+5°, 37,5°±2,5°
  • Dimension, c: 1,6 ± 0,8 mm

for line pipe


EN ISO 3183 and API Spec 5L [m]:

nominalminimalaveragemaximal
6 – SRL2.745.336.86
94.118.0010.29
12 – DRL4.2710.6713.72
155.3313.3516.76

EN ISO 3183 and API Spec 5L [ft]:

nominálnaminimalaveragemaximal
20.0 – SRL9.017.522.5
30.013.526.233.8
40.0 – DRL14.035.045.0
50.017.543.855.0

The tubes with deburred ends or ends customized for welding.
The tubes with deburred ends or ends customized for welding.

Line pipes

From 60.3 diameter beveled according to standards:

DIN, ENα = 40° – 60°, c = to 2 mm
ASMEα = 75° ± 5°, c = 1,6 ± 0,8 mm

Tubes packaging

(a) tubes bound with a steel band,
(b) tubes wrapped in plastic sheets, burlap,
(c) tubes in wooden crates.

Tubes are bound with steel band into bundles with weight 1 000–3 500 kg.

Packaking-STANDARD-tubes bound with a steel band
Packaking-STANDARD-tubes bound with a steel band
Packaking-STANDARD-bundle tied down by steel strap underlaid by paper
Packaking-STANDARD-bundle tied down by steel strap underlaid by paper
Packaking-STANDARD-PLUS-paper tape and polyethylene foil
Packaking-STANDARD-PLUS-paper tape and polyethylene foil
Packaking-STANDARD-PLUS-the bundle placed into a wooden box
Packaking-STANDARD-PLUS-the bundle placed into a wooden box
Packaking-PREMIUM-B-into a wooden box in which the tubes are wrapped in foil
Packaking-PREMIUM-B-into a wooden box in which the tubes are wrapped in foil
Packaking-PREMIUM-C-the bandles are wraped into and plastic foil
Packaking-PREMIUM-C-the bandles are wraped into and plastic foil
Packaking-PREMIUM-D-placing the whole shipment into foil+vacuum sealed
Packaking-PREMIUM-D-placing the whole shipment into foil+vacuum sealed

Testing of tubes for casing and tubing

Tubes are tested according to requirements of API 5CT standard, additional tests can be agreed when ordering the tubes.

Dimensional tolerances of tubes for casing and tubing

D < 4 1/2 inch = ±0,79 mm (±0,031 inch)
D ≥ 4 1/2 inch = –0,5 % +1,0 % D
T = –12,5 % (+limited by weight)
Weight (1 tube) = –3,5 % +6,5 %

Markings of the tubes

(a) marked with colored stripes on the tubes (tube bundles),
(b) marked with spray either by a white or black color using InkJet,
(c) marked by stamping the data (this applies to OD > 22 mm and WT >2.3 mm).

Bundles are marked with metal tag with required information

Marked by a label
Marked by a label
Marked by stamping the data
Marked by stamping the data
Marked with spray either by a white or black color using InkJet
Marked with spray either by a white or black color using InkJet

Testing of line pipes

Tubes are tested according to requirements of the appropriate standards.
In all cases the tube leaking test is performed.

Tubes meet the directive requirements NACE MR 0175. covering resistance to acid environment (SSC – Sulfide Stress Cracking).

When ordering the tubes it is possible to agree upon the carbon content value (CEV).

for casing and tubing

API 5CT
EN 102043.1
DIN 500493.1.B

for line pipes

API 5L
EN 102043.1, 3.2


for casing and tubing

Tubes are visually straight.

for line pipes

Tubes are visually straight. Max deviation 0.2 % of tube length

for casing and tubing

Hot rolled tubes do not go through further thermal processing. Tubes surface corresponds to the way they were produced.

Normal annealing (N) may be done after agreement.

for line pipes

Usually the tubes are supplied as hot rolled. Only tubes with DN 6 -10, perhaps tubes of other dimensions are supplied as cold drawn and after forming they are heat treated. This is done as per precious agreement.

The tube surface meets corresponds to the means of manufacturing.

Surface protection for oil tubes

The pipes are supplied without temporary anticorrosion protection.
While ordering, it is necessary to agree upon the method and means of temporarily protecting the surface of the tubes during transportation and storage.
Upon request the tubes may be plugged with plastic caps.


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