US 7,610,796 B2
Method for adjusting specific quality characteristics and properties of pipes by means of a pressure test
Siegfried Thomalla, Hilchenbach (Germany); Franz-Josef Schmeck, Freudenberg (Germany); and Hans-Joachim de la Camp, Gröbenzell (Germany)
Assigned to Eisen- und Metallwerke Ferndorf GmbH, Kreuztal-Ferndorf (Germany)
Appl. No. 10/577,190
PCT Filed Aug. 13, 2004, PCT No. PCT/EP2004/009128
§ 371(c)(1), (2), (4) Date Jan. 16, 2007,
PCT Pub. No. WO2005/046904, PCT Pub. Date May 26, 2005.
Claims priority of application No. 103 50 279 (DE), filed on Oct. 25, 2003.
Prior Publication US 2007/0143049 A1, Jun. 21, 2007
Int. Cl. G01M 3/04 (2006.01)
U.S. Cl. 73—49.5 5 Claims
OG exemplary drawing
 
1. A method for adjusting specific quality characteristics and/or properties of steel pipe by pressure testing, comprising the steps of:
pumping water into an interior of the steel pipe;
conducting a hydrostatic pressure test pursuant to DIN EN 10208 Part 2 using the pumped-in water; and
pumping a predetermined additional volume of water into the steel pipe ongoing from the hydrostatic pressure test so that the steel pipe is slightly stressed in the plastic range.