DIN 2445 Part-1 SEAMLESS STEEL TUBES FOR DYNAMIC LOADS HOT FINISHED TUBES NOMINAL PRESSURES 100 TO 400

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Rosamund Cameron
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1 DIN Part- SEAMLESS STEEL TUBES FOR DYNAMIC LOADS HOT FINISHED TUBES NOMINAL PRESSURES 00 TO 00. General information This Standard includes a suary of hot finished seamless steel tubes for dynamic loads, which are preferably used in hydraulic high-pressure installations. It applies to straight tubes. For details relating to the bending of tubes, see the Supplement to DIN. The outside diameters of the tubes and the wall thicknesses are taken from International Standard ISO or DIN. The design of dynamically loaded high-pressure installations is based on the nominal pressure of the pump or accumulator systems. To this pressure, for purposes of calculating the pipes, should be added the increudz in pressure from the dynamic load, and allowance made for the actual load alternation (see DIN,July 97 edition, Scope III). The tubes included in Tables to are calculated for continuous pulsating fatigue strength. Under special operation conditions tubes calculated for pulsating fatigue strength over a period are permissible(for details see Supplement to DIN ). Table.Correlation of the pressures All pressures are overpressures in bars Pressure change taken as a basis for calculation, for Nominal pressure of the installation (design pressure)*) PA water hydraulic installations with l = 0 m w = 0 m/s Ty = 0.s Maximum applicable pressure (calculated pressure for tubes) p Nominal pressure of pipeline components (e.g. flanges and fitted appliances) PN ± p**) Designation Designation of a seamless steel tube of.9 outside diameter and wall thickness of St. with delivery test according to DIN 9 Part : Tube.9 X DIN - St.. Dimensions and weights The dimensions and weights given in the Tables for pipes with wall thicknesses of up to comply with DIN and for pipes with greater wall thicknesses with ISO

2 Recoendation R. *) Designated in DIN (at present in draft form) with PN **) If the pipeline length l, rate w and closing time Ts vary considerably from those indicated in Table, the pressure surges p can be varied and taken from the straight-line graph. The pressure surges must then not be greater than p = 0 bar Table. Normal pressure of the installation (design pressure) = 00 bar Maximum applicable pressure (calculated pressure for tubes) = 0 bar = N/² 0 7,, 0 0,7,,,,,,9,,,,,9 0,9, 9,7,0,09,7,,,,9,,, 9,7,7 0,,,,,00 0 0,,, 0,7, 7,, 7,, 7,9 0,9, 7,7,,9 00,, 9,7 7,, 9,7 0 9,7,0 0,,,, 00 9, 7, 7 79, , 0, 7 0 Table. Nominal pressure of the installation (design pressure) = 0 bar Maximum applicable pressure (calculated pressure for tubes) = 0 bar = N/²

3 0 7,, 0 0,7,,,,,,9,,,,,9 0,9, 9,7,0,09,7,,,,9,, 7, 0,9,7 0, 0,, 0 0, 0, 9,9, 7,,,,7 0,9 0 0,,, 0, 00, 0 9, 9,,7,, 7 7, 0 77, 7, 00, , 70 00, 0 9 Table. Nominal pressure of the installation (design pressure) = 0 bar Maximum applicable pressure (calculated pressure for tubes) = 0 bar = N/² 0 7,, 0 0,7,,,,,,9,,,,,9

4 0,9, 9,7,0,09,7,,7,79,,,, 7,,07 0 0,,, 0, 0 70,,,,,9,9,, 0 0,, 7,, 7, 00 9,7 7, 0,,7, 0, 9 7, 0 9, , , Table. Nominal pressure of the installation (design pressure) = 0 bar Maximum applicable pressure (calculated pressure for tubes) = 0 bar = N/² 0 7,, 0 0,7,,,,,,9,9, 7,9,, 0,7,,,97,7, 7,,,,9,,,0 7,9 0 0, 0 0,,, 0 7,,, 0, 9,7 0, 9,,,7

5 0, 7, 79, 9,,7 00,7, 9, 7, 7,7 9, , , 0 0, Table. Nominal pressure of the installation (design pressure) = 00 bar Maximum applicable pressure (calculated pressure for tubes) = 0 bar = N/² 0 7,, 0 0,7,,,0,,7,7,9,,7,9,9 0,7,,,9,7,,,7,7 0,,, 9,7, 0 70,,, 9, 0,9 7,,9, 0, 0, 0, 9, 0, 0 9,7, , 0, 0 9, 9 9 0, , , 7**)

6 00 **) This wall thickness is not included in either DIN or ISO. Material St. according to DIN 9 Part. The publication of the Draft Standards DIN Part Seamless steel tubes for dynamic loads; hot-finished tubes, nominal pressures 00 to 00 Part -; precision steel tubes, nominal pressures to 00 Supplement -; bases of calculation for straight tubes Tube Wall Tube Deign Tube Wall Tube Deign o. d. thickness i. d. pressure's o. d. thickness i. d. pressure's bar bar

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