EN 39-2001 pdf download.Loose steel tubes for tube and coupler scaffolds Technical delivery conditions.
7.5 External weld bead and preparation of ends
The external weld bead of welded tubes shall be trimmed flush. Tube ends shall be cut nominally square
with the axis of the tube and shall be free from harmful burrs.
7.6 Dimensions, mass and tolerances
7.6.1 Dimensions
The specified outside diameter is 483 mm and the specified wall thickness is 3,2 mm for type 3 and
4.0 mm for type 4.
7.6.2 Tolerances on dimensions
The tolerance on specified outside diameter is +1—0,5 mm,
The tolerance on out of roundness is included in the diameter tolerance.
The tolerance on wall thickness is -10 %. However, for seamless tubes, a deviation from specified wall thickness of more than 10 % but not more than 15 % of the specified thickness may occur in smooth transition areas over no more than 25 % of the circumference.
The inside diameter of tubes shall allow insertion of a gauge of diameter 37.7 mm for a minimum length of 200 mm.
7.6.3 Mass
The nominal mass per unit length of type 3 tube is 3,56 kg/rn and for type 4 tube 4,37 kg/rn.
7.6.4 Tolerance on mass
The mass deviation on a single tube shall not exceed —7,5 % of the specified mass. NOTE The plus tolerance is controlled by 7.6,2.
7.6.6 Values for design of structures
Values for the sectional properties, modulus of elasticity and the mass per metre of tubes supplied in
accordance with this European Standard are given for information in annex A.
8 Inspection
8.1 Type of Inspection
The tubes shall be supplied with non-specific inspection and testing in accordance with EN 10021 unless option 5 is specified.
Option 5 the tubes shall be supplied with specific inspection and testing.
8.2 InspectIon documents
8.2.1 Types of inspection document
The following documents, in accordance with EN 10204, shall be issued.
Tubes with non-specific inspection shall be supplied without an inspection document unless option 6 is
specified.
Option 6 an inspection document type 2.1 or 2.2 in accordance with EN 10204, as specified by the purchaser, shall be supplied,
Tubes with specific inspection and testing (see option 5) shall be supplied with an inspection certificate type 3.1.8 in accordance with EN 10204.
8.2.2 Content of inspection documents
The content of the inspection documents shall be in accordance with prEN 10168 as shown in 8.2.2.1 and 8.2.2.2.
9 Sampling
9.1 Frequency of tests
9.1.1 Test unit
For product supplied with specific inspection and testing, testing for mechanical properties shall be carried
out on test units.
A test unit is defined as a quantity of tubes of the same grade and dimensions manufactured by the same
process and submitted for acceptance at the same time.
A test unit shall be less than or equal to 40 tonnes of tubes.
9.1.2 Number of samples per test unit
From each test unit one sample shall be taken sufficient for the preparation of the following test pieces.
— I tensile test piece.
1 flattening test piece, in the case of welded tube.
9.2 Preparation of samples and test pieces
9.2.1 Location, orientation and preparation of samples for mechanical tests
9.2.1.1 General
Samples and test pieces shall be taken at the tube ends and In accordance with the requirements of
EN ISO 377.
9.2.1.2 Test piece for the tensile test
The test piece for the tensile test is either a full tube section or a test piece taken in a direction parallel to the longitudinal to the axis of the tube in accordance with the requirements of EN 10002-1.
9.2.1.3 Test piece for the flattening test
The test piece for the flattening test shall consist of a full tube section in accordance with EN 10233.
The test shall be carried out on bare tube in accordance with EN 10002-1. at room temperature, and the following determined:
— the tensile strength (Rm);
the upper yield strength (R);
If a yield phenomena is not present, the 0,2 % proof strength (R 02) or the 0,5 % proof strength for total extension (Ro,5). In case of dispute the 0,2 % proof strength (Ro2) shall be determined.
the percentage elongation after fracture (A) with reference to a gauge length (L0) of 5.65J If a non-proportional test piece Is used, the percentage elongation value shall be converted to the value for gauge length L0 = 5.65J where S0 is the original cross-sectional area, using the tables given in
EN ISO 2566-1.
10.2 Flattening test
The test shall be carried out in accordance with EN 10233. The tube section shall be flattened with the weld. for successive tests, or, for tubes supplied with specific inspection, successive test units, placed alternately, at 00 or 900 to the direction of flattening.
When only one test unit is to be tested, the position of the weld is at the discretion of the manufacturer unless otherwise agreed.
The distance between the platens. measured under load, shall not be greater than 75 % of the original outside diameter of the tube and no cracks or flaws observed. The test shall be continued until the distance between the platens, measured under load, is not more than 60 % of the original outside diameter and no cracks or flaws observed in the metal elsewhere than in the weld.
NOTE Slight premature cracking at the edges would not be deemed to affect compliance with this standard.
10.3 Visual examination
Bare tubes shall be visually examined to ensure conformity to the requirements of 7,3.
10.4 Dimensional inspection
Specified dimensions of bare tubes, including straightness, shall be verified.
The outside diameter shall be measured with a gauge.EN 39-2001 pdf download.