pneumatic tubing swelling

[John]

Originally Posted by Chris_Ely

Is this tubing being connected directly to the compressor output?
If so, I would recommend adding some metal fittings before the plastic tubing to dissipate heat from the hot air coming out of the compressor. Placing one of the large fans from the KoP next to the compressor will also help.

In addition, remember that (from R76) the pressure relief valve must be directly connected to the compressor, with only rigid fittings in between (you can't put plastic tubing between the compressor output and the relief valve). If you currently are not doing this, the extra length from the valve might be enough.

Air leaving the compressor is hot because it is compressed rapidly without much time to transfer heat to the surrounding environment. By adding the valve (or additional metal fittings if you already have the valve in place), you give the air more time to cool off before it reaches the plastic tubing.