test to measure water hammer effects on … 26_test to measure... · believed that the failure was...

2400 Longhorn Industrial Drive, New Braunfels, Texas 78130 Ph: (830)629-8080 Fax: (830)629-6899 email: [email protected] NEWS RELEASE Copyright © 2001 Senior Flexonics Pathway. in a steam line under the streets of Manhattan. It is believed that the failure was due to water hammer caused by collapsing steam bubbles which were being introduced near the expansion joint that failed. Under contract from Consolidated Edison of New York (Con Ed), Senior Flexonics Pathway constructed a test fixture to simulate the effects of the steam bubbles that caused the Manhattan failure. The photo and CAD drawings show the 90 foot long test fixture. During the test, steam was introduced into the lower end of the water filled, test chamber that was pressurized to 200 psig. A test expansion joint was in- stalled between the flanges at the lower end of the test chamber. The local pressures caused by the collapsing steam bubbles were measured with instrumentation provided by Anco Engineers, a consulting firm from Los Angeles specializing in pressure and flow measure- ment. An internally pressurized expansion joint and an externally pressurized expansion joint designed for 200 psig were subjected to the test conditions. The test produced very short pressure spikes that measured over 4,500 psig right at the location of the collapsing steam bubbles. Despite the high local pressures, the test conditions were not sufficient to damage the expansion joints that were tested. TEST TO MEASURE WATER HAMMER EFFECTS ON EXPANSION JOINTS Senior Flexonics Pathway was pleased to be made part of this very interesting original research effort. To find out more about the above test or to inquire about Senior Flexonics Pathway capabilities, contact: Senior Flexonics Pathway, 2400 Longhorn Industrial Drive, New Braunfels, Texas 78130. Phone (830)629-8080, Fax (830)629-6899. NR 26

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Page 1: TEST TO MEASURE WATER HAMMER EFFECTS ON … 26_Test to Measure... · believed that the failure was due to water hammer caused by collapsing steam bubbles which were being introduced

2400 Longhorn Industrial Drive, New Braunfels, Texas 78130Ph: (830)629-8080 Fax: (830)629-6899 email: [email protected]

NEWS RELEASE

In the late summer of 1989, an expansion joint failed in a steam line under the streets of Manhattan. It is believed that the failure was due to water hammer caused by collapsing steam bubbles which were being introduced near the expansion joint that failed. Under contract from Consolidated Edison of New York (Con Ed), Senior Flexonics Pathway constructed a test fi xture to simulate the effects of the steam bubbles that caused the Manhattan failure.

The photo and CAD drawings show the 90 foot long test fi xture. During the test, steam was introduced into the lower end of the water fi lled, test chamber that was pressurized to 200 psig. A test expansion joint was in-stalled between the fl anges at the lower end of the test chamber. The local pressures caused by the collapsing steam bubbles were measured with instrumentation provided by Anco Engineers, a consulting fi rm from Los Angeles specializing in pressure and fl ow measure-ment. An internally pressurized expansion joint and an externally pressurized expansion joint designed for 200 psig were subjected to the test conditions.

The test produced very short pressure spikes that measured over 4,500 psig right at the location of the collapsing steam bubbles. Despite the high local pres-sures, the test conditions were not suffi cient to damage the expansion joints that were tested.

TEST TO MEASURE WATER HAMMER EFFECTS ON EXPANSION JOINTS

Senior Flexonics Pathway was pleased to be made part of this very interesting original research effort. To fi nd out more about the above test or to inquire about Senior Flexonics Pathway capabilities, contact: Senior Flexonics Pathway, 2400 Longhorn Industrial Drive, New Braunfels, Texas 78130. Phone (830)629-8080, Fax (830)629-6899.

NR 26