WNS Series horizontal Oil-fired (Gas) Boiler
-12-
can drain all boiler water, but at this time should open main steam valve and make boiler
connect with atmosphere. If need shorten cooling time, can add cold water from feeding water
tube and drain off hot water through blowing down pipe at the same time, but the water level
should not lower than the normal water level.
1.2 Inspection, cleaning and maintenance
1.2.1 If there are leakages of water level gauge, valves and pipeline flange, do repairing.
1.2.2 Open burner installation nozzle, hand-hole cover on the top of boiler, remove all deposit
ash.
1.2.3 Remove the ash deposit and residue oil inside furnace.
1.2.4 Remove the scale and mud, wash it with clean water.
1.2.5 Check the internal & external surface of boiler. For example, check whether there are
corrosion phenomena of the weld of pressure part and steel plate. If find serious default should
make repairing in time. If the fault I not so serious, can repair it next time while stop running
boiler. If find some problems but have no influence to safety, should well make record for later
reference.
1.2.6 If necessary, disassemble all outside case and insulation layer to do throughout inspection.
If find some serious destroy part, first must repair it then can use it. At the same time, make
record for the result of checking & repairing.
②
Every year should apply paint to the case of insulation layer and boiler bedplate for at least
one time.
③
If necessary, remove all residual ash inside chimney.
④
There are two methods of wet & dry maintenance for long-term protection of boiler. If stop
running boiler for over one month should use dry maintenance, if less than one month should
use wet maintenance.
4.1 Dry maintenance
Stop running boiler, drain off all boiler water, remove all dirt inside boiler and clean it,
bake it by faint fire, close all hand-holes and valves of pipeline.
4.2 Wet maintenance
Stop running boiler then drain off all boiler water, remove all dirt inside boiler and clean it
thoroughly, re-add the treated water to full of water, then heat it to 100
℃
, let the gas inside
eater out of furnace, close all valves. The wet maintenance is not permitted to use for cold
weather or place for avoid destroy the boiler because of freezing.
Ⅷ、
Inspection & hydraulic testing for pressure parts
①
Do periodical inspection to internal space & external surface of boiler according to the
stipulation of
“
Safety & Technical Supervision Regulation for Steam Boiler
”
. In generally, do
internal inspection every two years, do hydraulic testing to boiler for one time every six years.
②
Except for above item 1 mentioned periodical inspection, if happen to one of following case,
must do internal & external inspection and hydraulic testing:
2.1 New installing, re-installing and move installing boiler.
2.2 Stop running boiler for over one year, before re-start running boiler.
2.3 After repair or change some pressure parts greatly and re-running boiler for one year.
2.4 According to the boiler running status, has doubt to the equipments status.
③
Before inspection, should remove all the internal scale and external smoke dirt thoroughly,
if necessary, should disassemble the external cover and insulation layer. The inspection focal
point is as following:
3.1 Check the boiler drum, furnace weld and tube-hole to see whether they are in normal status,
whether exist leakage.
3.2 Whether the boiler steel plates have corrosion, bulb or deformation.
3.3 Whether there is scale or water slag beside pressure parts.
