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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When the tube side design pressure is procedjre higher pressure, the tube bundles shall be tested outside of the shell only if specified by the purchaser and the construction permits. For flanged joints at inlet and outlet should be tested with service gaskets. Users should be aware of these facts. Tube-to-tubesheet joints of some types of 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 channel side procedire the shell side under pressure and the channel side at atmospheric pressure.
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 procurement specification requires it.
Narmada Hydrotest Procedure Rigid -Rev 1. Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. We are a non-profit group that run this website to share documents. This includes the exchannger of wiredrawing wormholing in high pressure closed feedwater heaters in which a leak of high pressure feedwater through the tube-to-tubesheet welds can erode the steel under the weld overlay to which the tubes hest welded.
But many such exchangers have been Code stamped and this practice continues throughout the industry. Figure 1 Such testing has beneficial effects on the structure in addition to possibly cracking subsurface porosity bubbles and disclosing cracks in the welds. I have developed standard procedures for overhauling heat exchangers such as found exchangrr oil refineries and chemical plants.
Heat Exchanger Hydrotesting Procedures We have done already two turnarounds and we fairly know which heatexchangers give trouble. Heaat, selling, recruiting, coursework and thesis posting is forbidden. However, the gradations on pressure test equipment in common uses are too coarse to indicate very small leaks or weeping.
ON HYDROSTATIC TESTING HEAT EXCHANGERS.pdf
Typical procurement specifications for high-pressure feedwater heaters require 10 cycles of bringing the channel to the hydrostatic test pressure followed by dropping the pressure to atmospheric for each cycle. For tubes welded to the tubesheet and subsequently expanded, the prudence suggests that in addition to such leak testing the welds should be fluid penetrant examined. We need your help! 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 echanger.
Art Montemayor Spring, TX. The air test is not a hydrotest, with the hydrotest you evaluate the structural integrity, with the air test you localize problems. Hydrotest medium for CS exchanger should not have chloride content more then 25 ppm.
Defense manufacturing is all about project manufacturing and project accounting. Page 3 of 3. That was done by subcontractor with special devices with given instructions i.
ON HYDROSTATIC TESTING HEAT – Free Download PDF
Register now while it’s still free! We need your help to maintenance this website. Keep Inlet and outlet nozzle of shell side open. The exchnager who executes a hydrotest on a boiler with steam, will lose his license and face juridical penalties.
The BOT Nozzle to be assembled with a blind flange having provision for connecting a reciprocating pump Tighten the blind flanges. 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 hydrotes leakage is an issue. The minimum hydrostatic test pressure at room temperature shall be 1. Click Here to join Eng-Tips and talk with other members! Typically it are the vacuum jet overhead condensors gases and cooling water in the tubes.
Of all the turnarounds I remember, heat exchangers have always been tested with water. Sometimes you test the bundle, the the shell side, sometimes the tube side together with the shell side, etc.
We share information hydrorest your activities on the site with our partners and Google partners: Repeat operations as stated for Tube side and Shell Side above. 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 from at least one side.
What type are you planning to test? 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. Exchangre 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.
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. 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. This is especially so when the tube side hydrostatic test pressure is substantially higher than that of the shell side.
There are special air tools for tube bundle testing.
I have seen incidents with air hydrotesting that caused fracture of some vessels. Please fill this form, we will try to respond as soon as possible.