Armstrong 21AR Instalación y mantenimiento

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Installation and Maintenance
ARMSTRONG NO. 21AR AND NO. 21-312AR AIR VENTS
This bulletin should be used by experienced personnel as a guide
to the installation of Armstrong No. 21-AR
vents
and
their
equipment
should
assistance.
We encourage you to contact Armstrong or its local
representative
if
The maximum operating pressures for No. 21AR and No. 21-312 AR
are listed in Table 1.
PRESSURE.
The vessel design limitations of the No. 21-AR
Vessel
design
Table 1
I
No. 21 AR
With 4% oz. Float
FOR
TYPICAL
1 .
The inlet and the outlet piping should be the same size as
the
air
inlet
on
used on the outlet.
with a minimum of fittings andvalves.
THE INLET LINE,FROM
2 .
Install gate valves so the air vent can be isolated from the
system
to
VALVES.
repair
parts.
always
be
further
information
DO NOT EXCEED THE MAXIMUM OPERATING
limitations
for
250 psi
I
INSTALLATIONS,
vent
connections.
however, smaller pipe or tubing may be
light
loads;
Keep the piping as short as possible,
THE EQUIPMENT TO THE VENT.
permit
cleaning
and No. 21-312AR
Selection or installation of
accompanied
by
is
required.
No. 21-312AR
the
Model Number
No. 21-312 AR,
Forged Steel
With Std.
5 oz. Float
No. 21-312V AR,
Forged Steel
With Std.
5 oz. Float
and High Leverage
Mechanism
SEE
FIG.
l-7.
Do not reduce the size of the
and
repair.
competent
technical
are 250 psig @
are 750 psig @
Specific Gravity,
Range, 1.00 t o 35
25 psi
35 psi
55 psi
9/64
65 psi
165 PSI
3 0 0
430
680
DO NOT USE ELBOWS IN
DO NOT USE GLOBE
IB-22
air
psi
psi
psi