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MC • Edition 05.20 • Nº 279 663
14.5 Leakage test
14.6 Recommended maintenance intervals
Max. inlet pressure [bar]
Functional test
Maintenance
> 0.1 to 1
every 4 years
every 8 years
> 1 to 5
every 2 years
every 4 years
> 5
once a year
every 2 years
Lekspray
pmax = 10 bar
1
2
After carrying out maintenance or repair work,
check the device for internal and external leakages.
1. Test gas of the leakage test: air or inert gases.
2. Upstream and downstream shut-off valves must be
closed.
3. Test pressure > blow-off pressure SBV: Block the line
upstream of the SBV.
4. Connect the test section to the test device and apply
pressure.
5. Test pressure: 1.1 x system-specific operating pres
-
sure. PS maximum of the device (SAV 100… 10 bar/
SAV 60…6 bar). Please take into account the different
compressive strengths of the system.
6. Observe the waiting time necessary for the pressure
compensation according to the system-specific vol
-
ume.
External leakage.
7. Use a suitable leak detection spray on the device.
8. Monitor the foam formation.
Internal leakage.
9. Release the pressure in the test section downstream
of the device.
10. Monitor the pressure increase on the outlet side.
Pressure gauge accuracy 0.1 mbar
11. Once the leakage test has been carried out,
open the shut-off valve upstream of the SBV.
12. Release pressure in the test section.
13. Check the correct functioning and set values,
see section 11.3.
1. The maintenance intervals depend on the system-
specific operating and environmental conditions, gas
quality, condition of the pipelines, etc.
2. The maintenance intervals have to be set by the sys
-
tem operator according to the system requirements.
3. To guarantee the system availability, we recommend
a monthly function check and annual mainte-
nance.
4. It is necessary to comply at least with the mainte
-
nance intervals specified in G 495.
Содержание 279042
Страница 14: ...14 72 MC Edition 05 20 Nº 279 663 A B C D E A B C D E F Type UHD F Type HD ...
Страница 15: ...MC Edition 05 20 Nº 279 663 15 72 A B C D F E A B C D E F ND MD for G2 DN40 DN50 ND for G1 G1 5 y DN25 ...
Страница 43: ...MC Edition 05 20 Nº 279 663 43 72 Type UHD X Y Q S W V M C A B D E G F J K L N P H O R U I ...
Страница 45: ...MC Edition 05 20 Nº 279 663 45 72 Type ND MD for 2 DN40 DN50 M B D E G F J K L N H X Y Q S W V O I T ...
Страница 64: ...64 72 MC Edition 05 20 Nº 279 663 14 4 Tools required A B C2 D C1 ...