Pressure test ports are
p
r
o
v
i
d
e
d
f
o
r
s
i
m
p
li
f
i
e
d
p
r
e
ss
u
r
e
c
onn
e
c
t
i
on
s
[
Fi
g
u
r
e
9
]
.
!
W
ARNING
B
e
l
o
w
45
O
F
the
neoprene
core
o
f
the Pressure test
p
o
r
t
s
does not recover
i
t
s
o
r
i
g
i
n
a
l
shape
as
r
a
p
i
d
l
y
as
it
w
ou
l
d
at
t
e
m
p
e
r
a
t
u
r
e
s
above
45
O
F
.
T
h
e
r
e
f
o
r
e
,
upon
r
e
m
o
v
a
l
o
f
the probe used
f
o
r
pressure
or
t
e
m
p
e
r
a
t
u
r
e
r
e
a
d
i
n
g
s
,
t
h
e
v
a
l
v
e
s
may not
c
l
o
s
e
f
u
ll
y
and
i
mm
e
d
i
a
t
e
l
y
or the
v
a
l
v
e
s
may
r
e
m
a
i
n
s
li
g
h
t
l
y
open
un
t
il
the
o
p
e
r
a
t
i
n
g
t
e
m
p
e
r
a
t
u
r
e
i
s
above
45
O
F
.
D
u
r
a
t
i
on
o
f
probe
i
n
s
e
r
t
i
on
and
p
r
e
ss
u
r
e
are
a
l
s
o
f
a
c
t
o
r
s
i
n
the rate
o
f
v
a
l
v
e
c
l
o
s
i
n
g
.
F
o
r
t
h
i
s
r
e
a
s
on
,
p
l
u
g
s
s
hou
l
d
not be used
i
n
a
pp
li
c
a
t
i
on
s
where
d
i
s
c
h
a
r
g
i
n
g
gas or
li
q
u
i
d
s
w
ou
l
d
create a hazard.
T
h
e
g
a
s
k
e
t
e
d
c
a
p
i
s
s
u
pp
li
e
d
to
e
li
m
i
n
a
t
e
the
s
m
a
ll
amount
o
f
l
e
a
k
a
g
e
t
h
a
t
may occur
at
l
o
w
e
r
t
e
m
p
e
r
a
t
u
r
e
s
a
f
t
e
r
probe
i
n
s
e
r
t
i
on
a
n
d
r
e
m
o
v
a
l
.
T
h
e
cap
s
hou
l
d
be
l
e
f
t
on the
p
l
u
g
at
a
ll
t
i
m
e
s
and
t
i
g
h
t
e
n
e
d
to deter
un
a
u
t
ho
r
i
z
e
d
r
e
m
o
v
a
l
.
S
p
e
c
i
a
l
c
a
r
e
s
hou
l
d
be taken to
assure
that
r
e
a
d
i
n
g
s
are taken
i
n
t
h
e
shortest space
o
f
t
i
m
e
and that a probe
i
s
never
l
e
f
t
i
n
a
p
l
u
g
f
o
r
a
p
e
r
i
o
d
o
f
hours or days.
S
e
v
e
r
e
d
e
f
o
r
m
a
t
i
on
o
f
the
v
a
l
v
e
s
may occur
if
the probe
i
s
l
e
f
t
i
n
the
p
l
u
g
f
o
r
a
l
on
g
p
e
r
i
o
d
o
f
t
i
m
e
.
PRESSURE TEST
PO
R
T
S
Fi
g
u
r
e
9. Pressure test
p
o
r
t
s
T
y
p
i
c
a
ll
y
,
when
p
r
o
v
i
n
g
a meter, both the meter
pressure
a
n
d
meter
d
i
ff
e
r
e
n
t
i
a
l
pressure
are used and recorded.
T
h
e
R
A
B
O
meter
d
i
ff
e
r
e
n
t
i
a
l
pressure
ports are not
f
u
ll
bore and
m
o
s
t t
e
m
p
e
r
a
t
u
r
e
probes
will
not
fit
through
i
n
t
o
the gas
s
t
r
e
a
m
.
I
n
s
t
a
lli
n
g
the
t
e
m
p
e
r
a
t
u
r
e
probe
i
n
the
p
r
o
v
i
d
e
d
t
h
e
r
m
o
w
e
ll
ports
i
s
r
e
c
o
mm
e
n
d
e
d
.
T
h
e
meter
v
o
l
u
m
e
i
s
d
e
t
e
r
m
i
n
e
d
though a
d
e
v
i
c
e
that
s
e
n
s
e
s
the meter
r
e
v
o
l
u
t
i
on
s
.
An
o
p
t
i
c
a
l
p
i
c
k
u
p
can be
used on
t
h
e
i
n
d
e
x
p
r
o
v
i
n
g
w
h
ee
l
or an
i
n
d
e
x
p
u
l
s
e
r
may
be
u
s
e
d
.
O
n
-
s
i
t
e
p
r
o
v
i
n
g
,
p
e
r
f
o
r
m
e
d
i
n
-
li
n
e
,
a
l
s
o
r
e
q
u
i
r
e
s
c
onn
e
c
t
i
on
s
that
a
ll
o
w
a
i
r
f
l
o
w through the meter to the
prover.
T
h
i
s
i
s
a
cc
o
m
p
li
s
h
e
d
by use
o
f
p
i
p
e
T
ee
s
u
p
s
t
r
e
a
m
and
d
o
w
n
s
t
r
e
a
m
o
f
the meter.
A
bypass
l
oo
p
i
s
recommended
f
o
r
un
i
n
t
e
rr
u
p
t
e
d
gas
s
u
pp
l
y
to the
c
u
s
t
o
m
e
r.
W
h
il
e
p
e
r
f
o
r
m
i
n
g
an accuracy test, the meter
i
s
tested
f
o
r
a
s
p
e
c
i
f
i
e
d
v
o
l
u
m
e
o
f
gas at each
f
l
o
w rate test
p
o
i
n
t
.
P
oo
r r
e
p
e
a
t
a
b
ili
ty
at a
g
i
v
e
n
rate may be
caused
by a
test
v
o
l
u
m
e
that
i
s
too
s
m
a
ll
.
It
the meter does not repeat
w
i
t
h
i
n
a
cc
e
p
t
a
b
l
e
li
m
i
t
s
(
0
.
1
%
)
,
try
i
n
c
r
e
a
s
i
n
g
the test
v
o
l
u
m
e
and
r
e
t
e
s
t
i
n
g
the meter. Most
c
o
m
p
a
n
i
e
s
have
d
e
v
e
l
o
p
e
d
test
p
l
a
n
s
that
i
n
c
l
u
d
e
the
v
o
l
u
m
e
o
f
gas
f
o
r
each
s
i
z
e
meter at
a
g
i
v
e
n
f
l
o
w rate.
C
on
s
u
l
t
your
E
l
s
t
e
r
r
e
p
r
e
s
e
n
t
a
t
i
v
e
f
o
r
a
pp
li
c
a
b
l
e
v
o
l
u
m
e
s
.
b
)
D
i
ff
e
r
e
n
t
i
a
l
Pressure
T
e
s
t
i
n
g
A
d
i
ff
e
r
e
n
t
i
a
l
pressure
test
i
s
not an accuracy test, but
it
c
a
n
be used to
gauge
the
r
e
l
a
t
i
v
e
p
e
r
f
o
r
m
a
n
c
e
o
f
the
m
e
t
e
r.
R
o
t
a
r
y
meters are made
f
r
o
m
s
o
li
d
parts,
m
a
c
h
i
n
e
d
to
t
i
g
h
t t
o
l
e
r
a
n
c
e
s
w
i
t
h
c
l
o
s
e
c
l
e
a
r
a
n
c
e
f
i
t
s
,
and the energy
it
t
a
k
e
s
to turn the meter
i
s
g
e
n
e
r
a
ll
y
used to overcome
the
f
r
i
c
t
i
on o
f
the
b
e
a
r
i
n
g
s
and other
r
o
t
a
t
i
n
g
parts.
If
t
h
i
s
f
r
i
c
t
i
on
v
a
l
u
e
i
n
c
r
e
a
s
e
s
,
it will
take more energy to
overcome
it.
T
h
i
s
a
dd
i
t
i
on
a
l
energy
i
s
measured
as an
i
n
c
r
e
a
s
e
d
p
r
e
ss
u
r
e
drop across the
m
e
t
e
r.
T
h
e
i
n
c
r
e
a
s
e
d
f
r
i
c
t
i
on
i
s
caused
by
c
on
t
a
m
i
n
a
t
i
on
o
f
t
h
e
m
e
a
s
u
r
i
n
g
chamber
a
n
d
/
o
r
b
e
a
r
i
n
g
s
.
C
on
t
a
m
i
n
a
t
i
on
i
n
the
m
e
a
s
u
r
i
n
g
chamber can cause
t
h
e
meter
c
o
m
p
on
e
n
t
s
t
o
wear
a
g
a
i
n
s
t
each other.
C
on
t
a
m
i
n
a
t
i
on
i
n
the
b
e
a
r
i
n
g
s
makes them harder to
t
u
r
n
.
C
o
m
p
a
r
i
n
g
the
pressure
drop
r
e
a
d
i
n
g
when the
meter
i
s
n
e
w to the
r
e
a
d
i
n
g
c
o
ll
e
c
t
e
d
a
f
t
e
r
t
i
m
e
a
ll
o
w
s
the
p
e
r
f
o
r
m
a
n
c
e
to be
m
on
i
t
o
r
e
d
.
RABO
meters are
s
u
pp
li
e
d
w
i
t
h
Pressure test ports
i
n
s
t
a
ll
e
d
i
n
the meter
d
i
ff
e
r
e
n
t
i
a
l
pressure
ports
[
Fi
g
u
r
e
9
]
.
T
h
i
s
f
a
c
ili
t
a
t
e
s
d
i
ff
e
r
e
n
t
i
a
l
meter
t
e
s
t
i
n
g
.
A
d
i
ff
e
r
e
n
t
i
a
l
pressure
test
i
s
p
e
r
f
o
r
m
e
d
u
s
i
n
g
a
d
i
ff
e
r
e
n
t
i
a
l
pressure
m
a
no
m
e
t
e
r.
T
h
e
t
e
s
t
i
s
to
measure
the
pressure
drop
across the meter at a
g
i
v
e
n
f
l
o
w rate, under known
o
p
e
r
a
t
i
n
g
c
on
d
i
t
i
on
s
at a known
d
a
t
e
and
t
i
m
e
.
T
h
e
meter
d
i
ff
e
r
e
n
t
i
a
l
curve
o
f
f
l
o
w rate vs
pressure
i
s
no
t
li
n
e
a
r.
T
e
s
t
i
n
g
at
m
u
l
t
i
p
l
e
f
l
o
w rates
i
s
s
u
gg
e
s
t
e
d
.
It
i
s
p
r
e
f
e
r
a
b
l
e
to test at 3 rates between 25% and
1
00
%
o
f
f
l
o
w
if
p
o
ss
i
b
l
e
.
D
i
ff
e
r
e
n
t
i
a
l
pressure
tests at
f
l
o
w rates
un
d
e
r
25% are hard to
i
n
t
e
r
p
r
e
t
because
the meter
d
i
ff
e
r
e
n
t
i
a
l
pressure at the
l
o
w
e
r
flow rates is quite small.
T
h
e
e
rr
o
r
i
n
m
e
a
s
u
r
e
m
e
n
t
i
s
a
l
m
o
s
t
as
l
a
r
g
e
as the
r
e
a
d
i
n
g
i
t
s
e
l
f
.
T
h
e
meter
d
i
ff
e
r
e
n
t
i
a
l
pressure
i
s
a
l
s
o
a
f
un
c
t
i
on
o
f
li
n
e
pressure
and
i
n
c
r
e
a
s
e
s
as
li
n
e
pressure
i
n
c
r
e
a
s
e
s
.
T
e
s
t
i
n
g
the meter at the same
c
on
d
i
t
i
on
s
(
li
n
e
pressure
and
f
l
o
w
r
a
t
e
s
)
y
i
e
l
d
s
c
o
m
p
a
r
a
b
l
e
d
a
t
a
.
A
change
i
n
the
d
i
ff
e
r
e
n
t
i
a
l
pressure
i
n
d
i
c
a
t
e
s
a
c
h
a
n
g
e
i
n
p
e
r
f
o
r
m
a
n
c
e
.
T
e
s
t
i
n
g
has shown that a 50%
i
n
c
r
e
a
s
e
i
n
meter
d
i
ff
e
r
e
n
t
i
a
l
pressure
(
a
t
f
l
o
w rates over
25
%
)
,
i
n
d
i
c
a
t
e
s
a
l
m
o
s
t
a
1
.
0
%
change
i
n
meter
a
cc
u
r
a
c
y
.
B
a
s
e
li
n
e
data must be captured
d
u
r
i
n
g
i
n
i
t
i
a
l
start-up to w
h
i
c
h
f
u
t
u
r
e
data can be
c
o
m
p
a
r
e
d
.
If
the
d
i
ff
e
r
e
n
t
i
a
l
pressure
test shows an
i
n
c
r
e
a
s
e
i
n
the
m
e
t
e
r
pressure
drop at a
g
i
v
e
n
f
l
o
w rate
o
f
more than
50%
f
r
o
m
t
h
e
o
r
i
g
i
n
a
l
v
a
l
u
e
(
1
.
5
x
o
r
i
g
i
n
a
l
v
a
l
u
e
)
,
then
it
i
s
r
e
c
o
mm
e
n
d
e
d
that the meter be removed and
s
e
r
v
i
c
e
d
.
T
h
e
f
r
e
q
u
e
n
c
y
o
f
d
e
f
e
r
e
n
t
i
a
l
t
e
s
t
i
n
g
i
s
at the
d
i
s
c
r
e
t
i
on
o
f
the
u
s
e
r.
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