74
\…
_
_
-—--Equigîmsænt .
Ô
,
'
\
,
\
…
_
‘
.
constant attention. Air filters may be needed to excludé the punip’s*£ «
'
oil from the aquarium water, and large air reservoirs are advis‘able to '
_
smooth out the effects of the pulsations of the pistons. The whole
piping system should, if possible, be constructed in large bore pipe
—
in order to reduce back pressure,
and will generally be more expensive and more complex to install than the equivalent system for a
vibrator pump. However, it must be said that any good piston pump
is usually quieter and, if properly fitted up, can produce more air
than a single, small vibrator.
'
'
All air systems must be balanced so that the pumped air is not
lost through the channel of least resistance-. Thus all appliances must
_
be fitted with a règulator of some kind and these should be balanced
When everything is running normally. For example, in the installation
shown in Figure 19, each air lift may use as much as six times more air
than the diffuser stone. The resistance to air flow present in the stone
_
will tend to make allavailable air flow through—the air lifts,so the
; regulators must be caref_ully adjusted more or less simultaneously to
balance the system. Any change in the air cônsumptionbf one
'
pliance may affect at least some of the others, and so balancing may
‘
be needed whenevér
change
demandtÂkes place. Long—term
‘
changes, such as the gradual
up of
stones, may
"
necessitate _c0mpesating adjustments.
'
_
—
—
F Or large fishhouseé, aquarium shops and so
an industrial type
"1
of air compressor is often used, fitted with a large reservoir and
‘
trolled by a pressure switch to maintain a
pressure
inthe reservoir. Operation of the compressdr motor is then intertaken fro‘fh the reservoir is continuous”. By
Ï,—-ç
the pressure in thereservo at, say., 10 pounds p“en,sq. in.
……prsatidris from£the
-seCti'on
eliminated‘
‘_resetîVe
for short—lived emèrg€hcies., In terms of the
of electricity, intermittent pump operation _proves
_
to
...mofe
'
than r_eleaSing eXcess air to the atmosphere
un1t
WhlCh
To complete the supply system (Figure 24)
_
Îh€tÿp6, __and asafety blowoff ValiËe (set "higher
pressure) shouldbef1ttedto c0Ver"'giriy failureŸ of the pressureSW1tch
thesesh0uldfafftheapphanceconcernedmlshtrecelveavery
higha1f1nputwhmhculcreatepmblemsmtheenvmnment
thrughexcesstufbulenœorsupersaturatwnMostœmï—”ŒSŒS
arefalÿnœsywhenüperatmgandarebestmstalledmaæmme
\…
_
_
-—--Equigîmsænt .
Ô
,
'
\
,
\
…
_
‘
.
constant attention. Air filters may be needed to excludé the punip’s*£ «
'
oil from the aquarium water, and large air reservoirs are advis‘able to '
_
smooth out the effects of the pulsations of the pistons. The whole
piping system should, if possible, be constructed in large bore pipe
—
in order to reduce back pressure,
and will generally be more expensive and more complex to install than the equivalent system for a
vibrator pump. However, it must be said that any good piston pump
is usually quieter and, if properly fitted up, can produce more air
than a single, small vibrator.
'
'
All air systems must be balanced so that the pumped air is not
lost through the channel of least resistance-. Thus all appliances must
_
be fitted with a règulator of some kind and these should be balanced
When everything is running normally. For example, in the installation
shown in Figure 19, each air lift may use as much as six times more air
than the diffuser stone. The resistance to air flow present in the stone
_
will tend to make allavailable air flow through—the air lifts,so the
; regulators must be caref_ully adjusted more or less simultaneously to
balance the system. Any change in the air cônsumptionbf one
'
pliance may affect at least some of the others, and so balancing may
‘
be needed whenevér
change
demandtÂkes place. Long—term
‘
changes, such as the gradual
up of
stones, may
"
necessitate _c0mpesating adjustments.
'
_
—
—
F Or large fishhouseé, aquarium shops and so
an industrial type
"1
of air compressor is often used, fitted with a large reservoir and
‘
trolled by a pressure switch to maintain a
pressure
inthe reservoir. Operation of the compressdr motor is then intertaken fro‘fh the reservoir is continuous”. By
Ï,—-ç
the pressure in thereservo at, say., 10 pounds p“en,sq. in.
……prsatidris from£the
-seCti'on
eliminated‘
‘_resetîVe
for short—lived emèrg€hcies., In terms of the
of electricity, intermittent pump operation _proves
_
to
...mofe
'
than r_eleaSing eXcess air to the atmosphere
un1t
WhlCh
To complete the supply system (Figure 24)
_
Îh€tÿp6, __and asafety blowoff ValiËe (set "higher
pressure) shouldbef1ttedto c0Ver"'giriy failureŸ of the pressureSW1tch
thesesh0uldfafftheapphanceconcernedmlshtrecelveavery
higha1f1nputwhmhculcreatepmblemsmtheenvmnment
thrughexcesstufbulenœorsupersaturatwnMostœmï—”ŒSŒS
arefalÿnœsywhenüperatmgandarebestmstalledmaæmme