Parker HDK-CNG Series, Руководство по эксплуатации

Страница: 43 / 64

Maintenance and repair of the dryer
HDK-CNG_EN_03_2016 43
Component Maintenance task to be carried
Maintenance interval
da
il
y
w
e
e
k
ly
1
2
m
on
ths
24
m
on
ths
s
e
e
p
a
ge
Sensor of optional dewpoint-
sensing control system Replace.
  
Check valves Clean, replace if necessary.

47
Solenoid valves Valve bodies and purging - clean and replace if
necessary.
  
47
Dust sieves, gaskets, drying agent Replace.
   
47
Pre- and after-filter Check differential pressure on the upstream and
downstream filters.
  
45
Change the element.
  
46
When carrying out any maintenance work, comply with the following safety
instructions:
Danger!
There is a very considerable risk of personal injury, when carrying out
work on the activated and pressurised dryer.
Before commencing any maintenance tasks always shut down the dryer
as described on page 39, Depressurise the dryer and shut it down!
Before working on dryer, first purge the system with inert gas and
depressurise it.
On no account place the dryer into service or take the dryer out of service
without inerting it beforehand!
Together with air, gaseous methane can form an explosive gas mixture
and therefore poses a considerable danger. An explosive atmosphere can
build up during maintenance work especially when replacing the drying
agent. To avoid this, the dryer must be purged with inert gas both before
commissioning well as before taking out of service.
You will find information on inerting on Page 15.
Making preparations
Make the following preparations before starting maintenance work:
► Purge the affected section of pipework and the dryer with inert gas.
►
On ATEX-compliant dryers:
Cancel the Ex-zone (in acc. with owner's operating instructions).
► Block gas supply to the dryer.
► Depressurise the dryer.
► Allow the dryer to cool down.
Then start work - not before this point!