Page
4
P/N
06
‐
791
‐
4
(Rev.
4)
704
SW
10
th
Street,
P.O.
Box
610,
Blue
Springs,
Missouri
64013
‐
0610
U.S.A.
●
Phone:
(816)
229
‐
3405
●
www.fike.com
When
Should
a
Pressure
Maintenance
Pump
be
Used?
With
the
system
configurations
shown
in
Sections
1.2.1
and
1.2.1.1,
it
is
vital
that
the
water
supply
to
the
system
(see
Section
3.11
for
water
supply
requirements)
be
relatively
free
from
pressure
fluctuations
and
the
pipe
network
be
designed
to
provide
the
water
flow
required
to
trip
the
flow
switches
used
for
pump
activation
and
alarm
notification,
based
on
the
activation
of
a
single
OH
‐
VSO
nozzle.
Hydraulic
calculations
must
be
performed
on
the
pipe
network
prior
to
installation
to
confirm
that
the
water
supply
is
capable
of
providing
the
pressure
required
to
obtain
the
water
flows
required
for
pump
activation.
In
addition,
the
installed
system
must
be
functionally
tested
using
the
remote
test
valve
and
an
OH
‐
VSO
orifice
test
fitting
to
verify
pump
activation
based
on
the
activation
of
a
single
nozzle.
If
the
water
supply
is
NOT
capable
of
providing
sufficient
flow
and
pressure
for
pump
activation,
a
pressure
maintenance
pump
system,
as
detailed
in
Section
1.2.2,
must
be
installed.
Wet
Pipe
System
with
a
Pressure
Maintenance
Pump
NOTE
‐
DuraQuench
systems
configured
with
a
pressure
maintenance
pump
are
not
within
the
scope
of
the
system’s
FM
Approval.
This
system
configuration
(see
Figures
3
and
4)
incorporates
a
pressure
maintenance
(jockey)
pump
into
the
DuraQuench
system.
The
jockey
pump
can
be
mounted
directly
onto
the
pump
skid
or
field
installed
off
the
pump
skid.
The
jockey
pump
installation
will
include
a
separate
jockey
pump
controller
and
its
own
independent
pressure
sensing
line
connection.
The
purpose
of
the
jockey
pump
is
two
‐
fold.
The
first
purpose
is
to
maintain
a
higher
pressure
on
the
system
side
of
the
Fike
Wet
Alarm
Check
Valve
(WAC)
than
the
standard
water
supply
can
reach.
The
higher
pressure
holds
the
clapper
of
the
WAC
valve
and
Water
Flow
switch
closed
even
when
the
water
supply
pressure
fluctuates.
This
eliminates
false
alarms
caused
by
pressure
surges
in
the
water
supply.
The
second
purpose
of
the
jockey
pump
is
to
maintain
a
static
pressure
in
the
piping
network
to
prevent
short
cycling
of
the
fire
pump
caused
by
minor
pressure
losses
in
the
piping
network
due
to
leaky
fittings
and
changes
in
the
system
temperatures.
These
pressure
losses
can
cause
activation
of
the
fire
pump
under
non
‐
fire
conditions.
The
jockey
pump
is
a
high
‐
pressure,
low
‐
flow
pump
sized
so
that
it
can
compensate
for
small
pressure
fluctuations
in
the
system
piping
returning
the
system
to
its
normal
static
pressure
range
under
non
‐
fire
conditions.
However,
the
jockey
pump
cannot
sustain
the
system
pressure
after
the
activation
of
a
single
nozzle.
In
general,
the
jockey
pump
is
sized
so
that
its
flow
is
lower
than
that
expected
from
the
smallest
orifice
nozzle
on
the
system.
Therefore,
when
a
nozzle
opens,
the
jockey
pump
operates
but
cannot
maintain
adequate
system
pressure
due
to
the
relatively
high
volume
of
water
flow
from
an
operating
nozzle
as
compared
to
that
of
a
leaky
fitting.
The
pressure
within
the
system
continues
to
fall
until
the
fire
pump
starts
and
produces
the
required
flow
and
pressure
to
operate
the
system.
It
is
extremely
important
with
this
system
configuration
that
the
pressure
settings
of
both
the
fire
pump
and
the
jockey
pump
be
set
correctly
to
avoid
non
‐
emergency
starting
(short
‐
cycling)
of
the
fire
pump,
which
can
shorten
its
life
span.
The
pressure
setting
of
the
jockey
pump
should
be
set
so
that
it
starts
before
the
main
fire
pump
maintaining
a
minimum
static
pressure
in
the
piping
network.
NOTE
‐
Jockey
pumps
do
not
require
a
listing
as
fire
protection
equipment.
Any
pump
that
can
produce
the
necessary
pressure
is
acceptable.
Although
jockey
pumps
and
their
controllers
do
not
require
a
listing,
NFPA
20
includes
a
number
of
requirements
addressing
their
installation.
As
noted
above,
confirm
that
the
jockey
pump
controller
has
a
pressure
‐
sensing
line
independent
from
that
of
the
fire
pump.
Summary of Contents for DuraQuench
Page 93: ......
