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.
||2 April 2014
|PDF File Size:
|ePub File Size:
||Free* [*Free Regsitration Required]
It’s easy to join and it’s free. Your consent to our cookies if you continue to use this website.
ON HYDROSTATIC TESTING HEAT EXCHANGERS.pdf
Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. The shell side and the tube side are to be tested separately in such a manner that leaks at the tube joints can be detected proceeure at least one side.
It follows that users should specify that Manufacturers use other methods to verify non-visible ;rocedure when such leaks could be hazardous or harmful during operation of the heat exchanger.
The minimum hydrostatic test pressure at room temperature shall be 1. I hope this helps you out. If no leakages observed test procsdure be considered satisfactory.
Inspection is with the shell side of the exchanger under the hydrostatic test pressure divided by 1. I do not need to research the test pressures, just the methodology. That was done by subcontractor with special devices with given instructions i.
Art Montemayor Spring, TX. For flanged joints at inlet and outlet should be tested with service gaskets. Students Click Here Join Us! Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Figure 1 Such testing has beneficial effects on the structure in addition to possibly cracking subsurface porosity bubbles and disclosing cracks in the welds.
What type are you planning to test? If no leaks observed raise the pressure to corresponding Test Pressure of tube side as per approved equipment drawing.
Current practice is for Manufacturers heqt 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.
This is done after pulling and cleaning. Although gas leak testing is not onerous and costly, heat exchanger manufacture is a very competitive business and it is not likely that Manufacturers will perform testing that the ASME Code does not require unless the exchanged specification requires it. Some Manufacturers use strip chart or circular recording gages but the graduations are similar to those of dial gages. If there is pressure drop ,then investigate for the reason ason else reduce the pressure to corresponding design pressure for tube side and check for leakage.
Remember me Forgot password?
ON HYDROSTATIC TESTING HEAT – Free Download PDF
This is a very effective way to disclose leaking tube-to-tubesheet joints. Tube-to-tubesheet joints of some types hyfrotest shell-and-tube heat exchangers, such as fixed tubesheet designs and closed feedwater heaters in which the channel is welded to the shell, are visible only from the exchqnger side with the shell side under hydrltest and the channel side at atmospheric pressure.
Therefore, when they hydrostatically test the tube side, they rely on pressure loss in the tubes and channel during the holding period to indicate leakage through the tube-to-tubesheet joints.
Leak rates vary inversely with fluid viscosity. The engineer who executes a hydrotest on a boiler with pgocedure, will lose his license and face juridical penalties. Heat Exchanger Hydrotesting Procedures The air test is not a hydrotest, with the hydrotest you evaluate the structural integrity, with the air test you localize problems.
I have seen incidents with air hydrotesting that caused fracture of some vessels. 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.
Heat Exchanger Hydrotesting Procedures – Chemical plant design & operations – Eng-Tips
Therefore, typical feedwater heater procurement specifications require helium leak sniffer testing mass spectrometer testing the tube-to-tubesheet joints during manufacture. We do air tests on the individual tubes to identify leaking tubes. I have developed standard procedures for overhauling heat exchangers such as found in oil refineries and chemical plants. For constructions in which the Authorized Inspector cannot visibly examine the shell sides of tubesheets, heat exchanger users are cautioned that pressure loss to determine whether there are leaks from the channel into the shell does not indicate weeping through the tube-to-tubesheet joints because the gages in common use are not sufficiently sensitive to indicate a pressure loss that discloses such small leaks.
Check for leakage of all girth jointwhich are under pressure. 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. Heat Exchanger Hydrotesting Procedures As far as I know that the hydrotest by air is safety concern and water is usually used. In addition check nozzle flange joints between top and bottom heat exchanger for leakages. Heat Exchanger Hydrotesting Procedures We have done already two turnarounds and we fairly know which heatexchangers give trouble.
Severe wormholing can shorten feedwater heater life. Heat Exchanger Hydrotesting Procedures Art, thanks! Resources Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. Pressurize tube side to the corresponding design pressure.
The simplest and least costly additional test is gas-bubble testing often erroneously described as soap bubble testing. The air test is not a hydrotest, with the hydrotest you evaluate the structural integrity, with the air test you localize problems.