7 Gas Selection and Plumbing
Two-stage pressure regulators
Site Preparation Guide 51
Do not use old copper tubing with hydrogen gas. Old copper tubing can become brittle and
create a safety hazard.
Two-stage pressure regulators
To eliminate pressure surges, use a two-stage regulator with each gas tank. Stainless steel,
diaphragm-type regulators are recommended.
The type of regulator you use depends on the gas type and supplier. The Agilent catalog for
consumables and supplies contains information to help you identify the correct regulator, as
determined by the Compressed Gas Association (CGA). Agilent Technologies offers
pressure-regulator kits that contain all the materials needed to install regulators properly.
Pressure regulator-gas supply tubing connections
Use PTFE tape to seal the pipe-thread connection between the pressure regulator outlet and
the fitting to which you connect the gas tubing. Instrument grade PTFE tape (part number
0460-1266), from which volatiles have been removed, is recommended for all fittings. Do not
use pipe dope to seal the threads; it contains volatile materials that will contaminate the
tubing.
Pressure regulators typically end in fittings that must be adapted to the correct style or size.
Table 25 lists parts needed to adapt a standard 1/4-inch male NPT fitting to a 1/8-inch or
1/4-inch Swagelok fitting.
Two-stage regulator
Adapter to 1/8-inch female
Swagelok fitting
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