BS EN 39-2001 pdf download.Loose steel tubes for tube and coupler scaffolds – Technical delivery conditions.
9 Sampling
9.1 Frequency attests
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.
— 1 tensile test piece.
— I flattnninçj tt pic, in th case of welded tjhe
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 lensde strength (Rm);
— the upper yield strength (R.H);
If a yield phenomena is not present, the 0,2 % proof strength (R 0,2) or the 0,5 % proof strength for total extension (R105). In case of dispute the 0,2 % proof strength (R02) shall be determined.
the percentage elongation after fracture (A) with reference to a gauge length (!,) 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 = 5.65jç wtwre 0 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 positior 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 rio 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 o’acking at the edges wouk not be deemed to affect comptian 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 stra,ghtress, shaLl be verified.
The outside diameter shaM be measured with a gauge.
12 Marking
Tubes shall be marked by impression at linear intervals not exceeding 1.5 m. The height of the characters shall be at least 4,0 mm and the impression shall be such as to ensure legibility and durability For the anticipated lifetime of the product.
NOTE The legibdity and durability should normally be achieved with a depth of impression of at least 0,2 mm
Option 7 the depth of impression shall be at leas: 0.2 mm with inspection requirements In accordance with the manufacturers procedure.
The marking shall be legible after a coating in accordance with clause 13 has been applied. The marking shall show:
1) the number of this European Standard (EN 39):
2) the name or trade mark of the manufacturer
3) the thickness type, 3 or 4. Example of rile marking – N 39 xxx 4.
xxx = name or trademark of manufacturer.
Whon the coating opplicr Ia not tho tubo manufacturer. on additional durable mark shall be appliod to tho tube at intervals not exceeding 1,5 m showing the nane or trade mark of the coating applier: this mark shall not obscure the tube manufacturers mark.
13 Coating
The tubes shall be hot dip galvanized unless options 8, 9 or 10 are specified. The galvanizing shall be either in accordance with EN 10240 to coating quality B2 or Wi accordance with EN ISO 1461 (Table 2). except that the marking requirements shall be In accordance with clause 12.
Option 8 tubes shall be supplied bare.
Option 9 tubes shall be supplied with a temporary corrosion protection.
Option 10 tubes shaU be supplied painted. The coating shall meet the reqwrements of EN ISO 2409. classification 0102 from Table 1, and when tested in accordance with ISO 7253, meet the inspection requirement Ri 3 in accordance with ISO 4628-3.BS EN 39-2001 pdf download.