τιτανιο και nitrox

[tecrec]

Το τιτάνιο είναι ένα εξαιρετικό μέταλλο με πολλές εφαρμογές (πχ αεροναυπηγική).

Στην κατάδυση (1ο στάδιο ρυθμιστών) χρησιμοποιήθηκε για τρεις λόγους:
1. Γιατί είναι ελαφρύτερο (για αυτούς που ταξιδεύουν με τον καταδυτικό εξοπλισμό)
2. Γιατί αντέχει περισσότερο στη διάβρωση από το θαλασσινό νερό
3. Γιατί από πλευράς μάρκετινκ το τιτάνιο "πουλάει"

Δυστυχώς όμως έχει αποδειχθεί ότι τα παραπάνω πλεονεκτήματα αντισταθμίζονται με ένα σημαντικό μειονέκτημα.

Το τιτάνιο δημιουργεί εύκολα οξείδωση, η οποία στη συνέχει μέσω μίας εξωθερμικής αντίδρασης παράγει θερμότητα.

Σε συνδυασμό με την αυξημένη παρουσία οξυγόνου (nitrox) και την υψηλή πίεση στο πρώτο στάδιο μπορούν να δημιοργήσουν ένα "εκρηκτικό" κοκτέιλ.

Οι διάφοροι κατασκευαστές ρυθμιστών δίνουν διαφορετικές προδιαγραφές για την χρήση των ρυθμιστών τιτανίου για αέρια nitrox.

Το τι θα συμβεί ή εάν θα συμβεί κάτι, καλύτερα να μη προσπαθήσουμε να το μάθουμε ποτέ. Ας το αφήσουμε μόνο για τα πειράματα των χημικών.

Προσωπικά πιστεύω ότι δεν υπάρχει κανένας απολύτως λόγος για να αγοράσεις σήμερα ρυθμιστή τιτανίου (ο οποίος είναι εν γένει και πιο ακριβός).

[spyros70]

και κατι ακομα ενδιαφερον δια στοματος scubapro
Source:scubapro

“Titanium is not compatible with high blend Nitrox (oxygen enriched air) mixes because it may ignite when exposed to high oxygen concentrations. For this reason it is not advisable to use Titanium regulators with Nitrox but where local laws do not restrict the use of standard International fittings for Nitrox use (outside the EU for example), they may be used up to 40% Nitrox without any conversion. Titanium regulators cannot be cleaned or converted for use with Nitrox mixes higher than 40%.”

[spyros70]

ενδιαφερον αρθρο απο aqualung σχετικα με το θεμα

Q: Are Aqualung and Apeks regulators nitrox compatible?

• New Aqualung and Apeks regulators are now EAN compatible up to 40% oxygen (EAN40) right out of the box. This is possible because these regulators are built with a high level of cleanliness using EAN compatible components and lubricants. In addition, all of these regulator models have passed required adiabatic compression testing to ensure their safety and compatibility.

• Below, you will find a list outlining which Aqualung and Apeks regulators are authorized to be used, new, right out of the box, with EAN40.

• • All of the Legend Series
    • 129010 Legend LX
    • 129040 Legend LX Supreme
    • 129100 Legend
    • 129106 Legend Supreme
  • All of the Titan Series where the 1st stage serial number is greater than 2031000.
    • 129390 Titan LX
    • 129370 Titan LX Supreme
    • 100850 Titan Micra ADJ
    • 103155 Titan Glacia
    • 103100 Titan
  • Cousteau Series where the 1st stage serial number is greater than 2031000.
    • 109425 Cousteau Glacia
  • Calypso Series where the 1st stage serial number is greater than 2031000.
    • 105100 Calypso
    • 125120 Partner - those units with the satin finished Calypso 1st stage and the 1st stage serial number is greater than 2030150.

• • All Apeks Models with standard yoke connections that have the new filter guard (see details below).
  • All Apeks models with DIN connectors.

If a new regulator will be used with EAN with up to 40% oxygen, it is the responsibility of the owner to maintain the cleanliness of the regulator. If it is the intent of the owner to use the regulator interchangeably with breathing air, the breathing air should be oxygen-compatible or “hyper-filtered” whereas the condensed hydrocarbons do not exceed 0.1 mg/m3. Standard compressed breathing air, often referred to as Grade E does not meet this criterion. Grade E breathing air may contain a certain level of hydrocarbons, including traces of compressor oils that while not considered harmful to breathe, can pose a risk in the presence of elevated oxygen content. Passing hydrocarbons through a valve and regulator creates a cumulative effect where the hydrocarbons build up over time along the passageways of the equipment. When these hydrocarbons come in

• contact with high-pressure oxygen enriched air, they can pose a very real hazard that can lead to combustion.

• Therefore, if a regulator has had use with Grade E breathing air, it should receive a standard overhaul including ultrasonic cleaning with a detergent solution that removes hydrocarbons, prior to being put back into nitrox service.

• Although second stage components are not exposed to high pressure EAN, Aqualung recommends that the same cleaning procedures be followed for the complete regulator. This prevents the possibility of cross contamination and guarantees the cleanliness of the entire regulator.

What is Different About These Regulators?


The regulators listed above that are ready for use with up to 40% O2 are manufactured in a regulator “safe” room which has a higher level of cleanliness than a standard general assembly area. The air that is used for testing and adjusting these regulators has been hyperfiltered and certified as being relatively free of hydrocarbons. Components that were considered not to be compatible with oxygen have been replaced with oxygen compatible components.

How to Identify


All Legend models have been EAN40 compatible, out of the box, since they were first introduced at the beginning of the year. The Titan and Cousteau models with serial numbers greater than 2031000 and Calypso models with a serial # greater than 2030150 are also compatible.

You can also identify Titan models by removing the dust cap and visually identifying the new metallic filter washer with the conical opening.

All o-rings in the regulators today are made out of EAN safe polymers. Aqualung and Apeks do not use viton o-rings. Viton o-rings are not authorized for use in any Aqua Lung or Apeks regulator.

Converting Existing Aqualung Regulators to EAN40 Use


All existing regulators that incorporate a Cousteau, Titan, or Calypso first stage may be converted to EAN40 use. The regulator needs to have a standard overhaul service performed using one of the new revision service kits. In the case of the Titan first stage, in addition to the first stage service kit, you also the metallic filter washer added.
Apeks Regulators

[tecrec]

Αρχικό μήνυμα απο spyros70

ενδιαφερον αρθρο απο aqualung σχετικα με το θεμα

Q: Are Aqualung and Apeks regulators nitrox compatible?

• New Aqualung and Apeks regulators are now EAN compatible up to 40% oxygen (EAN40) right out of the box. This is possible because these regulators are built with a high level of cleanliness using EAN compatible components and lubricants. In addition, all of these regulator models have passed required adiabatic compression testing to ensure their safety and compatibility.

• Below, you will find a list outlining which Aqualung and Apeks regulators are authorized to be used, new, right out of the box, with EAN40.

• • All of the Legend Series
    • 129010 Legend LX
    • 129040 Legend LX Supreme
    • 129100 Legend
    • 129106 Legend Supreme
  • All of the Titan Series where the 1st stage serial number is greater than 2031000.
    • 129390 Titan LX
    • 129370 Titan LX Supreme
    • 100850 Titan Micra ADJ
    • 103155 Titan Glacia
    • 103100 Titan
  • Cousteau Series where the 1st stage serial number is greater than 2031000.
    • 109425 Cousteau Glacia
  • Calypso Series where the 1st stage serial number is greater than 2031000.
    • 105100 Calypso
    • 125120 Partner - those units with the satin finished Calypso 1st stage and the 1st stage serial number is greater than 2030150.

• • All Apeks Models with standard yoke connections that have the new filter guard (see details below).
  • All Apeks models with DIN connectors.

If a new regulator will be used with EAN with up to 40% oxygen, it is the responsibility of the owner to maintain the cleanliness of the regulator. If it is the intent of the owner to use the regulator interchangeably with breathing air, the breathing air should be oxygen-compatible or “hyper-filtered” whereas the condensed hydrocarbons do not exceed 0.1 mg/m3. Standard compressed breathing air, often referred to as Grade E does not meet this criterion. Grade E breathing air may contain a certain level of hydrocarbons, including traces of compressor oils that while not considered harmful to breathe, can pose a risk in the presence of elevated oxygen content. Passing hydrocarbons through a valve and regulator creates a cumulative effect where the hydrocarbons build up over time along the passageways of the equipment. When these hydrocarbons come in

• contact with high-pressure oxygen enriched air, they can pose a very real hazard that can lead to combustion.

• Therefore, if a regulator has had use with Grade E breathing air, it should receive a standard overhaul including ultrasonic cleaning with a detergent solution that removes hydrocarbons, prior to being put back into nitrox service.

• Although second stage components are not exposed to high pressure EAN, Aqualung recommends that the same cleaning procedures be followed for the complete regulator. This prevents the possibility of cross contamination and guarantees the cleanliness of the entire regulator.

What is Different About These Regulators?


The regulators listed above that are ready for use with up to 40% O2 are manufactured in a regulator “safe” room which has a higher level of cleanliness than a standard general assembly area. The air that is used for testing and adjusting these regulators has been hyperfiltered and certified as being relatively free of hydrocarbons. Components that were considered not to be compatible with oxygen have been replaced with oxygen compatible components.

How to Identify


All Legend models have been EAN40 compatible, out of the box, since they were first introduced at the beginning of the year. The Titan and Cousteau models with serial numbers greater than 2031000 and Calypso models with a serial # greater than 2030150 are also compatible.

You can also identify Titan models by removing the dust cap and visually identifying the new metallic filter washer with the conical opening.

All o-rings in the regulators today are made out of EAN safe polymers. Aqualung and Apeks do not use viton o-rings. Viton o-rings are not authorized for use in any Aqua Lung or Apeks regulator.

Converting Existing Aqualung Regulators to EAN40 Use


All existing regulators that incorporate a Cousteau, Titan, or Calypso first stage may be converted to EAN40 use. The regulator needs to have a standard overhaul service performed using one of the new revision service kits. In the case of the Titan first stage, in addition to the first stage service kit, you also the metallic filter washer added.
Apeks Regulators

Δεν ξέρω γιατί σε ενδιαφέρει τόσο πολύ το τιτάνιο για τον ρυθμιστή nitrox.

Πάντως, η ουσία του θέματος νομίζω ότι δεν είναι ούτε το τιτάνιο, ούτε οι κατασκευαστές.

Θα βρεις εύκολα να αγοράσεις ρυθμιστές EAN40 ή Ο2 compatible.

Το πρόβλημα ξεκινάει από εκεί και πέρα. Δηλαδή πως θα τους διατηρήσεις "καθαρούς" μέσα σε ένα καταδυτικό περιβάλλον που ίσως δεν είναι τόσο "καθαρό" ( πχ τα αέρια με τα οποία γεμίζεις τις φιάλες σου είσαι σίγουρος ότι πάντα είναι "καθαρά"; )
Η προδιαγραφή EAN40 ή Ο2 compatible μπορεί να χαθεί μέσα σε μία στιγμή...

[spyros70]

φιλε κωστα εμενα προσωπικα δεν μ ενδιαφερει ν` αγορασω τιτανιο ρυθμιστη. απλα επειδη το θεμα εχει να κανει με ασφαλεια σκεφτηκα εντελως ενημερωτικα να το ανεβασω για καποιους φιλους/ες που χρησιμοποιουν η σκεφτονται να χρησιμοποιησουν τιτανιο με nitrox και πιθανον προβληματιζονται με το συγκεκριμενο θεμα. δεν σου κρυβω οτι οταν διαβασα (εντελως τυχαια επεσα στο θεμα κι εμαθα κι εγω οτι αυτα τα δυο δεν κολανε) για το ατυχημα του δυτη στο σαν ντιεγκο ψιλοσοκαριστηκα. πως απο την διασκεδαση μπορεις ξαφνικα να μετατραπεις σε μολοτωφ. γι` αυτο το λογο εγραψα και τα serial number απο καποιους ρυθμιστες που πιθανον καποιοι φιλοι διαθετουν