there is on the market cheap alternatives to swagelok and parket fittings and conector for steel tubing . can somebody do comments.

Several manufacturers offer knockoffs of the Swagelok and Parker fitting dimensions.  The noticeable observation is that knockoffs lack the pretty finish of Swagelok.  More subtle and serious issues may also exist.  Swagelok uses a special carborization technique for stainless that hardens the ferrules.  I can look for the details but it could take some time.  If the knockoff fittings lack the polished finish, surely they also lack the metallurgical techniques too.

I am less familiar with any special metallurgical issues with Parker.  Even the major hydrocarbon processing companies consider the knockoffs for air supply tubing etc(filter).  Few use knockoffs for analyzer tubing.

1. There are cheap alternatives.
2. Don't buy them.
3. There is a reason Swagelok, Parker and Gyrolok have a large markedshare and that is quality.  There are other quality vendors but beware of a product substantially cheaper than the rest of the market.
4. I inherited an offshore project supplied with Australian pneumatic fittings which were much cheaper than Swagelock.  After replacing 100 leaking fusible loop plugs and an entire hydraulic system it cost us at least double of Swagelock, never mind the man-hours.

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