Problems with PEX

Possible problems with PEX and how to fix them

1. When testing for leaks connection leaking.

The connection can leak into the case, if the test was carried out earlier than provided in this instruction, ie earlier than 30 minutes after installation. If the cause of the leak are not defects in the pipe or the connecting elements, it can be quickly eliminated by PEX radiant heating rings and tubes with hot air. This will speed up crimp fitting PEX material and sealing compound. It should be remembered that the air was warm 40-50 ° C (free to stand hand). Before we begin to address the leak, should be drained from the system all the water, because the connection during the PEX radiant heating should not be under pressure.

2. The ring slides along the tube

Samoobzhimnoe ring can slide along the PEX pipe, if its end or the ring itself was not clean or dry (grease). If this happens, you can cut the end of the PEX pipe together with the ring and install the new pipe. You can also remove the pipe ring and wipe with a cloth PEX tube. The ring can be reused, this should install it on the tube side, which was less extended. In this case, during the first and second extension handle extender should be confined only to one half.

3. Segments expander head hard disclosed

If segments of the expander head hard disclosed, the reason for this may be the lack of grease on the cone expander, or the use of graphite lubricants of poor quality. This can be checked using a simple test: in the enlargement process must release the handle expander – if the cone lubricated properly handle PEX tool spontaneously opens. PEX tool should always be clean and lightly oiled resistant to high pressure graphite grease!

4. The head of the expansion PEX tool slips out of the PEX pipe

In the process of expanding the head of the PEX tool may slip from the tube. The reason for this may be the wear of its segments, or the presence on their surface lubrication. In the case of the wear segments of the head, you must replace it with a new one.

5. PEX Fitting not fully inserted into the tube

The pipe should be installed so that its end was combined with a smooth surface fitting. If this condition is not met, you should rewire the connection. In that case, if you run the new connection is not possible, for example, in a remote place, it is necessary to test the system for leaks and verify that it works.

Test system for leaks

The tightness can be checked after 30 minutes after installation. To do this, the system must produce all the air and create pressure to 1.5 times the working (15 bar). Within 10 minutes after the pressure decreases, it must be raised to the original. After 20 minutes, this operation is repeated again. After 30 minutes after the start of the test pressure must be reduced to 0,5 Rrab. Within 10 minutes after the pressure decreases, it must be raised to the original. After 30 minutes after the start of the test pressure must be reduced to 0,5 Rrab. Then it must spontaneously rise somewhat and stabilized. The value of steady pressure should not be changed within 90 minutes.