®
3
- a mounting tube for welding, has a free tube section left to be welded to the burner plate. Pilot fixing inside the
mounting tube as in p. 7.1. There are two lengths A available: 150 and 600 mm.
4. IGNITION SOURCES FOR GAS PILOT LIGHT-OFF. (SETTING METHOD)
Sources of ignition in the gas pilot
SP-48
are electrical high energy spark igniters (HESI) or high tension igniters
(HTI) equipped with the ignition rods of outer diameter 16 mm and coaxial electrode arrangement (see Fig. 3):
- for the high energy spark igniter (HESI): this type of device creates single sparks of a high energy
of about 12 J. With frequency of 4 to 5 sparks per second it ensures reliable ignition of a gas/air mixture under
all conditions. The secondary circuit voltage is nominally 2,000 VDC at primary supply 230VAC or 110 VAC,
- for the high tension igniter (HTI): this type of device creates an electrical arc of low energy which allows for
ignition of a gas/air mixture in clean environment and repeatable conditions. The secondary circuit voltage is
8,000 VAC at primary supply 230VAC or 110 VAC.
Using the Fireye High Tension Igniter, the end of the rod tip should be placed at a distance of 10 mm back from the
swirler-stabilizer (see Fig.1). In case of the High Energy Spark Igniter, the rod tip should be placed further back ~
50 mm back from the swirler-stabilizer.
It should be noted that the rod tip positioning against the swirler-stabilizer plate in the pilot gas part
assembly (pos. 1 on Fig. 1) should be done outside the air tube only (do not install the rod in the gas head
already mounted in the air tube). Only after proper rod positioning, should the rod be fixed by tightening the
rod holding gland and the whole gas assembly with igniter rod inserted into the air tube pos. 4.
The rods of both types of devices are mounted in gas head by means of a holding gland 1/2"BSP.
The ignition device is not in gas pilot scope of supply. It is normally specified and ordered separately.
FIGURE 3.
Gas pilot type SP-48-
NG/PG
-FD with examples of electrical ignition devices
.
Gas Pilot type SP-48-NG/PG-FD-xxx
with HTI igniter rod type HTSS-xxx-J (Spark & Sense) for safe area
HESI igniter rod for safe area
HESI igniter rod for Zone 1 Exd
HTI igniter rod type HTSS-xxx-CEX for Zone 1 Exd (Spark & Sense)
HTI igniter rod type HTSS-xxx-J-CEX with j. box for Zone 1 Exd (S&S)
ignition point
