16
DETAILS OF DE-AERATION DEVICE CONNECTORS
SINGLE PIPE SYSTEM: WITH DE-AERATION DEVICE
BOTTOM OF OIL STORAGE TANK BELOW OR
LEVEL WITH BURNER
TWO PIPE SYSTEM: BOTTOM OF OIL STORAGE TANK
BELOW OR LEVEL WITH BURNER
Fig.21
Fig.22
Two pipe supply system: If the tank base is below
the level at which the gravity feed to the burner can
be maintained a two pipe oil supply system may be
adopted. (See fig. 21). The non-return valve in the
supply line of the two pipe system is required to
prevent oil running back from the burner and un-
priming the oil pump. The non-return valve in the
return line is only required if the top of the tank is
above the burner. Its purpose is to prevent oil
running
back
through
the
burner
during
maintenance.
These requirements are further explained within the
following documents:
*
B.S. 5410 : Part 1 : Code of Practice for oil
firing installations up to 45 kW output capacity
for space heating and hot water supply
purposes.
*
OFTEC Technical Information Book Three.
Installation requirements for oil fired boilers and
oil storage tanks.
*
The Building Regulations Part J: England,
Wales, Part F - Section 4 Scotland and
Part L Northern Ireland.
*
The Building Regulations Part J: Rep. Ireland.
Single pipe system with de-aeration device
fitted: This system can be used where the tank
base is below the level at which gravity feed to the
burner can be maintained and the burner
incorporates an oil pump. The chamber is fitted
close to the burner and is linked to the tank by a
Fig.23
single pipe, thus saving the return pipe required by
the two pipe system as described previously. Any
air in the oil brought up from the tank is bled off in
the de-aeration chamber.
De-aeration chambers must always be installed
externally to buildings because they emit small
quantities of vapour. The chamber is connected to
the oil pump in the burner of the appliance by
normal two pipe loop.
Fig.20
When gravity feed is used (the most common) the
minimum head should not be below 1m (3’3”) and
the maximum head should not exceed 6.5m (21’
3”).
NOTE:
The pump is factory set for a single pipe
installation.
Single pipe supply system
: Tanks servicing this
appliance by means of a single pipe need to be
positioned so that they will apply the minimum head
required 1 meter (3’ 3”) of oil to the burner when the
fuel level is at its lowest point.
Refer to BS 5410 to calculate the additional head
requirement relating to pipe length and size.
PUMP
