Instruction manual

Instruction Manual
HAS64E-IM-HW
September 2008
NGA 2000 HFID
4 - 27Maintenance and ServiceEmerson Process Management GmbH & Co.OHG
4-13 LEAKAGE TEST
The gas path system should be leak tested at least twice
a year and after maintenance, replacement or repair of
gas path parts.
a) Required Tools
• Test Medium
• external Manometer
• Swagelok
®
Blind Unions SS (2)
• Swagelok
®
Blind Unions brass (2)
• tube piece with rubber stopper
b) Procedure
To perform a leakage testing, proceed as follows (see
figure 4-23):
1. Close gas supplies and disconnect the gas con-
nections
2. Close „Fuel IN“, „Burner Air IN“, „Bypass OUT“
and „Regulated Air IN“ with blind unions
3. Close „Exhaust“ with a tube piece with rubber stop-
per.
Figure 4-23: Principle Leakage Test Assembly
Table 4-1: Leakage Test Specifications
4. Connect a pressure meter to „Sample IN“ fitting
5. Connect test medium supply (N
2
or He) to the pres-
sure meter
6. Supply Analyzer Module with the test medium with
a pressure of max. 250 hPa (3.63 psig) and close
supply. Since HFID internal it comes to equaliza-
tion of pressure, supply is to open and to close
repeatedly until manometer doesn’t show pres-
sure changes.
7. Watch the manometer.
Over a period of about 5 minutes the pressure
drop may not be higher than 7.5 hPa/min. (- 0.11
psig/min.) using Helium (He) or 2.5 hPa/min.
(- 0.036 psig/min.) using Nitrogen (N
2
).
If the specifications (see table 4-1) were adhered to,
then the test is finished.
POSSIBLE INSTRUMENT DAMAGE
The pressure of the test medium must
not exceed 250 hPa (3.63 psig) !
CAUTION
Test Medium Nitrogen (N
2
) Helium (He)
Test Pressure
3.63 psig / 250 hPa / 0.25 bar 3.63 psig / 250 hPa / 0.25 bar
Test Time
5 min 5 min
permissible
Drop in Pressure
2.5 hPa (0.036 psig) / min 7.5 hPa (0.11 psig) / min
External Manometer:
3.63 psig = 250 hPa
Gas source with
test medium
Closed Gas Connections:
„Fuel IN“, „Burner Air IN“,
„Bypass OUT“, „Exhaust“,
„Regulated Air IN“
Sample In
P
N
2
or
He
HFID Analyzer Module