EP 1537398 A1 20050608 - LEAKAGE DETECTING METHOD FOR PIPES AND PIPE SYSTEMS
Title (en)
LEAKAGE DETECTING METHOD FOR PIPES AND PIPE SYSTEMS
Title (de)
VERFAHREN ZUR LECKPRÜFUNG VON ROHREN UND ROHRSYSTEMEN
Title (fr)
PROCEDE DE DETECTION DE FUITE POUR TUYAUX ET SYSTEMES DE TUYAUX
Publication
Application
Priority
- DE 10242162 A 20020910
- EP 0309998 W 20030909
Abstract (en)
[origin: WO2004025241A1] The invention relates to a leakage detection method for pipes and pipe systems, in particular for closed pipe systems which are place in the form of a closed circuit in the ground underneath an airfield, such as hydrant circuits. The inventive method consists in determining a pressure fluctuation DeltaP=P2- P1 and a temperature variation DeltaT=T2-T1 in successive measuring intervals DeltaT, and an absolute volume change is calculated in relation to the measuring intervals DeltaT in order to determine a leakage rate DeltaV (DeltaT= t2- t1) by combination with a specific volume change which is pressure-related. In order to reduce measuring time and improve the accuracy of measurements, the detected values of temperature and/or pressure measurements are filtered. A trend curve R4 is determined using the filtered R1, R2, R3 and R4 values of temperature and/or pressure measurements. The accurate temperature and/or pressure value is obtained from the trend curve R4 for each moment in time and the leakage rate DeltaV is rapidly determined on the basis of the values of temperature and/or pressure measurements which are determined by using the trend curve R4.
IPC 1-7
IPC 8 full level
G01M 3/28 (2006.01)
CPC (source: EP)
G01M 3/2815 (2013.01); G01M 3/2892 (2013.01)
Citation (search report)
See references of WO 2004025241A1
Citation (examination)
- US 4308746 A 19820105 - COVINGTON MORRIS T
- US 5272646 A 19931221 - FARMER EDWARD J [US]
- US 5343737 A 19940906 - BAUMOEL JOSEPH [US]
- US 4796466 A 19890110 - FARMER ED [US]
- US 5201212 A 19930413 - WILLIAMS BARRY N [US]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004025241 A1 20040325; AU 2003273845 A1 20040430; DE 10242162 A1 20040318; EP 1537398 A1 20050608
DOCDB simple family (application)
EP 0309998 W 20030909; AU 2003273845 A 20030909; DE 10242162 A 20020910; EP 03757809 A 20030909