Steel Tube Handbook - 2018

7 Technical delivery conditions (TDC) of tubes All tube requirements are concentrated in the TDC standards. The particulars are detailed for the individual types of tubes. An im- portant part is the testing of tubes. Summary of the tests is given in the following chapter. The general TDC for steel and steel pro- ducts are in EN 10021 standard. Symbols and definitions are in EN 10266. General TDC is also in ISO 404. Tube testing Tube testing demonstrates that properties of the tubes are consis- tent with the requirements of the order and the relevant standards. The process is divided into three parts: • determination of the type of test (EN 10021, EN 10204) • determination of the type of inspection document (EN 10204, ISO 10474) • selection of individual tests (particularly TDC) The individual parts are connected and there is no possibility of any combination. Self testing is determined by TDC standard for the individual types of tubes. • Non-specific and specific testing Unspecified testing - contains only mandatory tests according to the appropriate standard - the test samples do not have to be from their own delivery - testing station does not have to be independent at the tubes treatment plant Specific testing - besides the mandatory tests it contains additional optional tests - samples of tubes are from supplies, their number is set by stan- dard - testing station must be independent at the tubes treatment plant • Tests - mandatory - according to the TDC standard - optional - agreed when ordering tubes from selection accor- ding to standards • Quality - TR 1, TR 2 depends on: - chemical composition (Al content) - values of mechanical properties (bending impact test) - the type of test of tubes (specific and non-specific testing) • Quality - NL1 and NL2 (steel grades for low temperatures) depends on: - chemical composition (S content) - values of mechanical properties (bending impact test) - NL1 – use in low temperature - NL2 – use in especially low temperature • Test category - TC1 and TC2 depends on: - provisions of standard - chemical composition (carbon and alloy steel) - the possible option when ordering of tubes (in C steel) The categories differ from each other mainly by demand for nondestructive testing of tubes, or selection of tests. • Documents about testing Overview of kinds of attests in accordance with EN 10204 depe- ding on the kind of testing: Unspecified testing 2.1 Company confirmation (confirmation from the manufactu- rer, without the test results) 2.2 Company non-specific certificate (certificate from the manu- facturer, the test results on the basis of unspecified testing) Specific testing 2.3 Company specific certificate, test results based on specific testing. It is issued at this kind of testing when the ma- nufacturer has no independent testing laboratory. If the laboratory is independent, instead of this certificate the 3.1.B certificate is issued. 3.1.A Inspection Certificate 3.1.A (officially appointed expert) 3.1.B Inspection certificate 3.1.B (company expert) 3.1.C Certificate 3.1.C (expert from customer) 3.2 Report 3.2 (company expert and expert from customer ) Release EN 10204 : 2004, ISO 10474 : 2013 2.1 Statement of compliance with the order 2.2 Test report 2.3 Not considered 3.1 Inspection certificate 3.1 (formerly 3.1.B) 3.2 Inspection certificate 3.2 (formerly 3.1.A, 3.1.C, 3.2) In the EN is the Table - Context of categories of systems according to Directive 97/23 EC, Annex I, section 4.3, and the type of certificate. The tests are divided into groups: • control of the chemical composition of the steel - cast - product • dimensional inspection • mechanical properties * - tensile test - (Hardness) - bending impact test • technological tests * - flattening - drift expanding - flanging - bending - ring tensile test • water tightness test - hydrostatic pressure - non-destructive methods • Non-destructive testing - longitudinal imperfections (Eddy current, stray fluxes, - transverse imperfections ultrasound) - laminar imperfections • further testing (metallography, corrosion resistance, etc.). • report attached on page 102 - 104 Method STN,ČSN DIN(SEP) EN ISO ASTM Dimensions ISO Leak tightness tests Hydrostatic pressure 42 0415.8 TDC Standards D < 140 mm NDT 01 5047 01 5049 01 5054 SEP 1925 10 893 - 1 see NDT 9302 Non-destructive tests (NDT) Eddy currents 01 5054 (PRP 02-74) 10893 - 2 E 309 D > 4 mm, T > 0,5 mm 9304 Stray fluxes 01 5047 SEP 1913 10893 - 3 E 570 D > 32 mm, T > 2 mm** 9402 Ultrasound - L longitudinal imperfections Ultrasound - Q transverse imperfections Ultrasound - D laminar imperfections 01 5028 - 2 01 5028 - 3 01 5028 - 4 SEP 1915 SEP 1918 SEP 1919 10893 - 10 10893 - 10 10893 - 8 E 213 D > 13 mm, T > 1(2) mm** 9303 9305  Tube lengths - see the survey table for each group of tubes Notes: 1) ** values apply to ŽP, a.s. Overview of the leak tightness tests and non-destructive testing Table 2