STEEL TUBE AND PIPE HANDBOOK - February 2012

11 EN 10216 – 1 EN 10216 – 2, 3, 4 Quality TR1 or TR2 Test category TC1 or TC2 C- steel, sort of quality is included in steel name C- steel – option TC1 or TC2 Alloy steel – TC2 only 1. Leak tightness test Mandatory test for all tubes. Option from methods: 1.1 Hydrostatic test Hydrostatic test shall be carried out at a test pressure of 70 bar or a test pressure P calculated using the following equation, whichever is lower: P = 20x (SxT)/D, where S = stress in MPa, corresponding to 70% of minimum yield strength. 1.2 NDT (electromagnetic test) according to EN ISO10893 – 1 (E) Option from methods: 1.2.1 encircling coil – diameter of drilled hole in reference standard may be specific as percentage of wall thickness or diameter of tube 1.2.2 rotary probe coil – reference standard with depth of the notch of 12,5% of nominal wall thickness T (min. 0,5 mm, max 1,5 mm). Width of notch is smaller as depth, length min. 50 mm. 2. Non-destructive testing – longitudinal imperfections 2.1 Quality TR2 - optional test 2.2 Test category TC2 – mandatory test - option from methods: - option from methods: 2.1.1 EN ISO 10893-2 (electromagnetic) 2.2.1 EN ISO10893-10 (ultrasonic) Level U2, sub-category C 2.1.2 EN ISO10893-3 (flux leak tightness) 2.2.2 EN ISO10893-3 (flux leak tightness) Level F2 2.1.3 EN ISO10893-10 (ultrasonic) Level 3, sub-category C 2.3 transverse imperfections (EN ISO10893-10, U2C) 2.4 laminar imperfections (EN ISO10893-8, U2) 2.5 measurement of WT (EN ISO10893-12) – only as optional test upon agreement. Leak tightness test and NDT of tubes for pressure purposes according to EN The pressure tubes of category TC2 are usually tested with combination of two NDT: - electromagnetic (eddy current) test (leak tightnes) - ultrasonic test (NDT) Testing methods E – Eddy Current (EN ISO10893-1 and 2). (Test 1.2 and 2.1.1 in the table above.) For tubes with D ≥ 4 mm. Encircling coil – level of admitance E1H, E2H, E3H, E4H (diameter of drilled hole in reference standard may be specific as a function of diameter D – see table in standard) Rotary probe coil – level of admitance E2, E3, E4, E5 F – Flux Leakage (EN ISO 10893-3). (Testing 2.1.2 and 2.2.2 in the table above.) For tubes with D ≥ 10 mm. Level of admitance F2, F3, F4, F5, F6 U – Ultrasonic – longitudinal imperfections EN ISO10893-10 – transverse imperfections EN ISO10893-10 – laminar imperfections EN ISO10893-8 (WT over 5 mm) – measurement of WT (EN ISO10893-12) (WT over 4,5–5 mm) (Tests 2.1.3, 2.2.1, 2.3, 2.4 and 2.5 in the table above). For tubes with D ≥ 10 mm and rate D/T > 5. For smaller rate agreement. Level of admitance of EN ISO10893-10 – U1, U2, U3, U4, U5, U6 Semilevel A, B, C, D Test level and depth of gauge notch in % of wall thickness: 1 3 2 5 3 10 4 12,5 5 15 6 20 Note EN 10216-1 – only C-steel is included in standard Subcategory – minimum depth of notch (mm) A 0,1 B 0,2 C 0,3 D 0,5 Subcategories A, B, C, D are applied for cold formed and machined tubes. Subcategories C and D are applied for hot rolled tubes. Other values of levels of admitance as in EN – upon agreement. Transverse, laminar testing and measurement of WT imperfections – upon agreement only. Testing according to ASTMA and API 5L - see page 23 (leakage test), page 39 (NDT), page 59 (API 5L)