Diener femto, Руководство по эксплуатации, Страница: 130 / 156

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10.6 Gas piping
Our machines are equipped with swageloks of the size 6 mm, therefore you need stainless steel tubes
with an inner diameter of 4 mm and an outer diameter of 6 mm to observe the regulation TRGS (no.
220) for gas piping.
To open and close the piping you will need an open-end-wrench with a size of 14 mm. For laboratory
operation with incombustible and non-toxic gases you can use pressure resistant flexible tubes (PU-
hose with Ø outside: 6 mm, Ø inside: 4 mm) instead of stainless steel tubes.
Quite safely gases are: N
2
, O
2
, noble gases, CF
4
,
Etching gases like NF
3
and NH
3
have to be piped with stainless steel.
At use of special gases contact your local gas supplier.
More information on www.swagelok.com.
10.7 Gas bottle safety guideline:
To ensure a riskless operation with gas bottles note following things:
•
Store gas bottles in suitable containers at the outside of the building (if possible).
•
In case that it is not possible to store the containers outside (by structural engineering of the
building), the gas bottle has to be protected from impacts and falling down. Therefore special
equipment is available, like bottle retainers with chains.
•
Check fitting for leaks by connecting the fitting with the bottle. At obscurities check the fitting
audible (is there a hissing to hear?) and visual (drop some water on fitting and look for bubbles).
•
The connection for the tube towards the fitting (see fig. above) must never be mounted with tools!
This will squeeze the flexible tube too much and may damage it.
•
By using PU-tubes as gas piping, you have to operate with the right equipment (bracing sleeve,
clamping ring, screw cap).
Brass connectors must ever be mixed with stainless steel
connectors!
Screw cap clamping ring bracing sleeve correct order of connection
•
Concerning the safety guidelines for special gases, please contact your local gas supplier or read
the particular safety data sheet (chapter ‘safety data sheets’).
•
An amount of 4 % hydrogen in the air is already explosive. To calculate the explosion hazard for
your workstation use following formula:
e.g.:
Volume of hydrogen bottle: 2 litres
Pressure of bottle (full): 200 bar
Dimension of room: 50 m²,
Height of room: 3 m
Volume of room: 150 m³
Gas escapes / leak: 2l (200bar)
→
400l (1bar)
400l
→
0.4 m³/150 m³ =
0.0026 %
hydrogen in atmosphere of a 50m² big and 3 m high room.