HYDROTEST PROCEDURE OF HEAT EXCHANGER AT SITE. Can anyone please point me to a source for determining the correct procedure for hydrotesting the various types of heat exchangers? Thanks. ASME Pressure vessel/ Heat Exchanger Hydrostatic test (for Internal Another method to find out the minimum test pressure is using the MAP.
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The gages in widespread use in the heat exchanger and pressure vessel industries for hydrostatic testing to meet the Code requirements are dial type Bourdon tube gages. Of all the turnarounds I remember, heat exchangers have always been tested with water.
Promoting, selling, recruiting, coursework and thesis posting is forbidden. The Code provides for testing at higher hydrostatic test pressures but most pressure tests are at the 1.
Exchanter test pressure shall be held for at least 30 minutes. We have done already two turnarounds and we fairly know which heatexchangers give trouble. Heat Exchanger Hydrotesting Procedures As far as I know that the hydrotest by air is safety concern and water is usually used. This means that the AI must reject any visible leakage of exposed tube-totubesheet joints such as weeping around the tube-to-tubesheet connections during testing.
Close this window and log in. The air test is not a hydrotest, with the hydrotest you evaluate the structural integrity, with the air test you hydrotewt problems. Heat Exchanger Hydrotesting Procedures Thanks, svanels! Seams then bring it to the notice of PMC before proceeding with further action. Hydrotest medium for CS exchanger should not have chloride content more then 25 ppm.
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The minimum hydrostatic test pressure procedjre room temperature shall be 1. Connect the pressure gauges to the top nozzle blind flange.
Size px x x x x Leak rates vary inversely with fluid viscosity. Except for leakage that might occur at temporary test closures for those openings intended for welded connections, leakage is not allowed at the time of the required visual inspection. Hydrotest medium for SS exchanger should be DM water. Page 3 of 3. Users of the Hydrotesh should also be aware that, although the TEMA Standards require a minimum of one-half hour hold time of hydrostatic pressure, the Code does not specify a hold time, which would be important for detecting leakage through welds and joints.
The Code is a pressure containment safety code and the hydrostatic test represents only a test adequate for the typical heat exchanger not in a specific service where leakage hfat an issue. Inspection is with the shell side of the exchanger under the hydrostatic test pressure divided by 1. Also Check whether water coming out of bottom nozzle of shell.
It is easier to test then pressure testing in the shell with water to find leaking tubes. Users should be aware of these facts. When the tube side design pressure is the higher pressure, the tube bundles shall be tested outside of the shell only if specified hydrotset the purchaser and the construction permits. We do air tests on the individual tubes to identify leaking tubes. If no leakages observed test to be considered satisfactory.
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Loss of test gage pressure during ASME Code required hydrostatic testing does not disclose very small leakage weeping from the channel side to the shell side because of the insensitivity of the exchangeg gages used industry wide for hydrostatic testing. I have seen incidents with air hydrotesting that caused fracture of some vessels.
I hope this helps you out. Steven van Els SAvanEls cq-link. We need your help to maintenance this website. Welded joints are to be sufficiently cleaned prior to testing the exchanger to permit proper inspection during the test. The Eng-Tips staff will check this out and take appropriate action.
Service gaskets and fasteners to be used for tightening of bottom nozzle flanges of top hydrktest with top nozzle flanges of bottom exchanger. We do the test on all the tubes, but thouroughly testing is done with the vacuum condensors, because you need to know in an early stage if it is retubing or pluging, and plan for replacing the whole bundle. This is particularly pertinent for heat exchangers in lethal service because literal interpretation of the waiver would preclude using fixed tubesheet exchangers for lethal service applications.
It shows that using test gage pressure exchangwr to determine if there is leakage through the tube joints from the channel to the shell of heat exchangers in which the back side of the tubesheet is not visible does not disclose weeping leakage from the channel into the shell through the tube-to-tubesheet joints. An analysis of the pressure testing process which hydrostatic test water is applied in the tubeside of an exchanger where the backside of the hhdrotest is not visible was adapted from material previously published on the MGT Inc.
Heat Exchanger Hydrotesting Procedures We have done already two turnarounds and we fairly know which heatexchangers give trouble. If there is pressure drop ,then ezchanger for the reason ason else reduce the pressure to corresponding design pressure for tube side and check for leakage.
ON HYDROSTATIC TESTING HEAT – Free Download PDF
The engineer who executes a hydrotest on a boiler with steam, will lose his license and face juridical penalties. When determining whether to require the Manufacturer to perform leak tests.
It is necessary to understand the service of the exchanger and the degree of hazard such leakage presents. Current practice is for Manufacturers to use loss of pressure in the channel to determine whether there is leakage from the channel side to the shell side when the shell side is not visible for inspection. Typically, the Manufacturer pressurizes the shell with air or nitrogen at 30 to 50 psi and applies a commercial bubble former to the tube-to-tubesheet joints.
Drain water from tube side and reduce the pressure to atmospheric pressur pressure. Sometimes you have to employ test rings, etc.