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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Civil Procedure Civil Procedure. Despite the Code rules about the unacceptability of leakage through the joints of pressure vessels and heat exchangers, the TEMA and API standards do not require leak testing every heat exchanger and Manufacturers will not perform such leak tests unless Users request them.
The test pressure shall be held for at least 30 minutes. What type are you planning to test? We have done already two turnarounds and we fairly know which heatexchangers give trouble.
The range of the pressure gauge should be as per applicable code. Fill up the tube side with water and see that proper venting hydfotest done and there is no trapped air.
Students Click Here Join Us! It follows that users should specify that Manufacturers use other methods to verify non-visible leakage when such leaks could be hazardous or harmful during operation of the heat exchanger. Welded joints are to be sufficiently cleaned prior to testing the exchanger to permit proper inspection during the test. Connect the pressure gauges to the top nozzle blind flange.
It demonstrates that relying on gage indication of pressure loss to hext leaks weeping that would not be visible during hydrostatic testing does not indicate whether there are such small leaks.
I remember air tests being conducted for some vessels they taped all flanges to detect leaksbut rather as an exception to the rule.
If there is pressure drop ,then investigate for the reason ason else reduce the pressure to corresponding heeat pressure for tube side and check for leakage.
Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. The minimum proccedure test pressure at room temperature shall be 1. Keep Inlet and outlet nozzle of shell side open. The air test is not a hydrotest, with the hydrotest you evaluate the structural integrity, with the air test you localize problems.
Download Now White Paper: Keep the pressure for 1 hour. Drain water from tube het and reduce the pressure to atmospheric pressur pressure. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. The language of the waiver in UG 2 g needs clarification with respect to using fixed tubesheet exchangers for lethal service, possibly with a specific exception allowing their use with appropriate precautions.
Narmada Hydrotest Procedure Rigid -Rev 1. I have seen incidents with air hydrotesting that caused fracture of some vessels. Thank you for interesting in our services.
Typically it are the vacuum jet exxhanger condensors gases and cooling water in the tubes.
See Table 1 for typical test pressures and pressure gage graduations. The engineer who executes a hydrotest on a boiler with steam, will lose his hest and face juridical penalties. In addition check nozzle flange joints between top and bottom heat exchanger for leakages. This practice satisfies the TEMA requirement that leaks at the tube joints can be detected at least from one side.
But many such exchangers have been Code stamped and this practice continues throughout the industry. The Eng-Tips staff will check this out and take appropriate action.
As far as I know that the hydrotest by air is safety proceudre and water is usually used. When determining whether to require the Manufacturer to perform leak tests. The Code provides for testing at higher hydrostatic test pressures but most pressure tests are at the 1. That was done by subcontractor with special devices with given instructions i.
Heat Exchanger Hydrotesting Procedures – Chemical plant design & operations – Eng-Tips
Please help us to share our service with your friends. The TEMA Standards require testing the shell and tube sides separately in such a manner that leaks at the tube joints can be detected at least from one side. If the exchanger service is for a fluid less viscous than water the likelihood of leakage in services may be very high if the Manufacturer relies on changes in the pressure gage reading to assess whether there is leakage from the channel side into the shell during hydrostatic testing.
Can anyone please point me to a source for determining the correct procedure for hydrotesting the various types of heat exchangers?