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This Guide is made available for the express use of owners and users of the Dive Lab XLDS systems.
This information is subject to periodic updates and changes. Always check the Dive Lab web site for the latest versions.
Document XLDS Guide – Section Four A
Revised September 30, 2019
13
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
O-ring and or any other types of leakage must be
repaired prior to use. Use the Dive Lab Appendix
A2.1A Pressure/Joint Tightness procedure.
Teflon Tape
When making up pipe fittings of 1/4" or smaller,
for best results, use three (3) mil thickness
Teflon® tape. The tape used should be 1/4" wide.
Half inch (1/2”) wide, three (3) mil tape on 1/4"
or smaller pipe threads, can be used but will not
stretch and form to the small diameter threads,
as well as 1/4" tape. Normally, 1-1/2 wraps
applied under tension, is all that is required on
brass to brass fittings, however for stainless
fittings we recommend up to two and a half (2-
1/2) wraps to achieve a tight seal. The tape
should be applied under tension, starting 1-1/2 to
2 threads back, from the start of the fitting. In
addition, we recommend applying a small
amount of Christ Lube over the Teflon® tape.
Making up 3/8” to 1/2” Pipe Fittings
When making up three eighths (3/8”), or half inch
(1/2") pipe fittings, three (3) mil thickness Teflon
tape, or six (6) mil thickness tape, half inch (1/2")
wide may be used. If three (3) mil is used, use two
(3) to four (4) wraps. If six (6) mil is used, use one
and a half (1-1/2) to two (2) wraps. Apply tape
under tension starting one and a half (1-½) to two
(2) threads back from the start of the threads.
Torque/Tightening
Pipe threads should be tightened using good
engineering practice. Tighten pipe threads
securely, but do not over tighten. Normally pipe
threads should engage at least 1 ½ to 2 full turns
by hand, followed by at least 2 full turns by
wrench.
RDC Regulator
The standard regulators used for the RDC, are
Aqua Environments® model 873 piston type hand
loaded regulator of a balanced poppet, designed
for high flow with a minimum effect on outlet
pressure. The poppet assembly is contained in a
cartridge, with internal filtration for easy in-field
changing. The regulator is NOT intended for
oxygen, or oxygen enriched gas mixtures. The
regulator should be used with filtered breathing
quality air only.
Specifications
· Maximum inlet pressure 5000 PSIG (340 BAR)
· Outlet pressure 0 - 400 PSIG
· Flow coefficient (Cv) 0.8
(equivalent to 0.23” orifice)
· Rise of outlet pressure with drop of inlet
pressure 10 PSIG/1000 PSIG
· Materials – body and cap – aluminum
· Internals – brass, stainless
· Seals – KEL-F, Buna, Viton
· Fittings – ¼” FNPT inlet
½” FNPT outlet
· Size – 3” dia. x 6” long
Installation
Use only Teflon tape on inlet and outlet threads
of the aluminum regulators never use lubricant
on aluminum threads used in high pressure piping
systems. Avoid over tightening of pipe threads.
Pipe
thread
fittings
should
thread
in
approximately 1 ½ to 2 threads by hand, and 2
threads by wrench. Normal torque, applied with
an 8-12 inch long wrench, is ample.
The inlet (HP) is on the left, when facing the
adjusting knob with the two gauge ports upward.
NOTICE
The purpose for the allowable leakage, is to allow
continued use of the system to be used, until
repairs can be made.