# US 7,610,796 B2 · Method for adjusting specific quality characteristics and properties of pipes by means of a pressure test

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- Number: US 7,610,796 B2
- Document ID: US7610796B2
- Status: Granted
- Kind: B2
- Application number: 10/577,190
- Filed: 2004-08-13
- Published: 2007-06-21
- Granted: 2009-11-03
- Earliest claimed: 2003-10-25
- Assignees: Eisen- und Metallwerke Ferndorf GmbH
- Inventors: Siegfried Thomalla; Franz-Josef Schmeck; Hans-Joachim de la Camp
- Web page: https://patentgrep.com/patent/US7610796B2

## CPC

- G01M 3/2846: {for tubes (G01M3/30 takes precedence)}
- G01N 3/12: Pressure testing
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

The invention relates to a method for adjusting specific quality characteristics and/or properties of pipes (1) by means of a pressure test, especially for steel pipes of pipe conduits for combustible media. According to said method, in addition to the water volume required for the pressure test according to DIN EN 10208 part 2, an additional water volume (12) is filled into every single pipe (1) with the proviso that the pipe material is slightly subjected to plastic stress.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

Method according to claim 1, wherein the method includes adjusting specific quality characteristics and/or properties of steel pipe for pipelines for combustible media.

### Claim 3 (depends on 1)

Method according to claim 1, wherein the additional water volume remains in the pipe for a period of 2 to 3 mm.

### Claim 4 (depends on 1)

Method according to claim 1, wherein the pipe is enlarged at the outer diameter by 0.2 to 0.3%.

### Claim 5 (depends on 1)

Method according to claim 1, wherein the additional water volume which is taken into consideration as an intended value is determined by filling in a step by step manner an additional water volume into a test pipe until the changes reach a previously determined limit value.