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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Register now while it’s still free! I remember air tests being conducted for some vessels they taped all flanges to detect leaksbut rather as an exception to the rule. I have developed standard procedures for overhauling heat exchangers such as found in oil refineries and chemical plants. I don’t have a source, but I’ve done it many times on differet HeatX’s. 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.
Your consent to our cookies if you continue to use this website. API also accepts this practice. 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.
Please copy and paste this embed script to where you want to embed Embed Script. Sometimes you have to employ test rings, etc. If no leaks observed raise the pressure to corresponding Test Pressure of tube side as per approved equipment drawing.
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.
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In addition check nozzle flange joints between top and bottom heat exchanger for leakages. 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 with the shell side under pressure and the channel side at atmospheric pressure.
The range of the pressure gauge hyddotest be as per applicable code. Hydrtoest, typical feedwater heater procurement specifications require hydrotsst leak sniffer testing mass spectrometer testing the tube-to-tubesheet joints during manufacture. Designers, Users, and Hat should agree on the definition of joint type and to the nondestructive Tests NDT for all welded joints.
Students Click Here Join Us! 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. This is a very effective way to disclose leaking tube-to-tubesheet joints. However, the gradations on pressure test equipment in common uses are too coarse to indicate very small leaks or weeping.
It is necessary to understand the service of the exchanger and the degree of hazard such leakage presents. 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.
We need excganger help! Narmada Hydrotest Procedure Rigid -Rev 1. Open vent and drain. Size px x x x x I’ll be searching the TEMA standards.
Some Manufacturers use strip chart or circular recording gages but the graduations are similar to those of dial gages. What constitutes a suitable leak test if the standard Code hydrostatic test cannot disclose very small leaks weeping? By joining you are opting in to receive e-mail. Users must recognize the hazards of process fluids leaking hydrotset the channel into the shell and where hazards exist, specify further leak testing as described in Section V of the Code.
But many such exchangers have been Code stamped and this practice continues throughout the industry. Hydrotest Dan Pneumatic Test. Heat Exchanger Hydrotesting Procedures Art, thanks!
See Table 1 for typical test pressures and pressure gage graduations. Connect the pressure gauges to the top nozzle blind flange. It’s easy to join and it’s free.
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We are a non-profit group that run this website to share documents. Reasons such as off-topic, duplicates, flames, hydroteat, vulgar, or students posting their homework. Check for leakage of all girth jointwhich are under pressure. 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 is an hydroteet.
Keep Inlet and outlet nozzle of shell side open.
The crude-vacuumbottoms and other oil to oil exchanges normally don’t give problems, we never found a leak. Basically one man at channel head side with an airgun and another at floating head side to plug the other end with a pressure gauge.
I have seen incidents with air hydrotesting that caused fracture of some vessels. Hydrotest medium for SS exchanger should be DM water. Users of the Code 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. Remember me Forgot password? Red Flag This Post Please let us know here why this post is inappropriate.
Art Montemayor Spring, TX.