MegaLife ARV Series, Руководство по обслуживанию, Страница: 33 / 172

MegaLife ARV OUTDOOR UNIT
–
ARV 6 ALL DC INVERTER T1 50&60HZ Service Manual
33
5. Gas Tightness Test
5.1 Purpose and Steps
To confirm whether there is leakage in pipe by using nitrogen, and the steps are as
follows
①
Observe pressure drops
It’s necessary to correct if pressurized temperature is different from observed ambient
temperature with difference of 0.01MPa/1 ℃ .
Correction value = (Pressurized temperature - observed temperature ) x 0.01
Example:
Pressure is 4.0 MPa and temperature is 25 ℃ in case of pressurization.
①
②
if N o d ro p in th e
p re ssu re g a u g e p o in te r
if
Pre
ssu
re
g a
ug
e
p o
int
e r
d r
o p
C o m p le tio n o f g a stig h tn e ss te st
if N o d ro p in th e
p re ssu re g a u g e p o in te r
4. C h a rg in g n itro g e n g a s
4.0 Mpa
a n d ke e p
24h
, to c h e c k is th e re a
sma ll lea ka ge
o r
n o t
1. A fte r th e c o m p le tio n o f w e ld in g , C o n n e c t th e
nitrogen cylinder
、
nitrogen
regula te va lve
a n d
nitrogen pressure ga uge
2. C h a rg in g n itro g e n g a s
0.3 Mpa
a n d ke e p
3 minutes
, to
check
is th e re a
big lea ka ge
o r
n o t
if
Pre
ssu
re g
a u
g e
p o
inte
r d
ro p
if N o d ro p in th e
p re ssu re g a u g e p o in te r
A p p ly
soa p wa te
r
to c h e c k fo r le a ka g e ,
Fin d o u t th e le a k p o in t
a n d re w e ld
3. C h a rg in g n itro g e n g a s
1.5 Mpa
a n d ke e p
3 minutes
, to c h e c k is th e re a le a ka g e o r
n o t
if Pre ssu re g a u g e
p o in te r d ro p