WNS Series horizontal Oil-fired (Gas) Boiler
-13-
3.4 Whether there is fault at the connecting position between feeding water pipe, draining
water pipe and boiler drum.
④
If find serious corrosion, should check the strength calculation before hydraulic testing.
⑤
Testing pressure
The testing pressure should comply with the requirements of table 10-1 of
“
Safety &
Technical Supervision Regulation for Steam Boiler
”
.
⑥
Hydraulic testing sequence
6.1 The hydraulic testing should be conducted under the condition of the surrounding
temperature upper than 5
℃
, if the temperature is lower than 5
℃
, should take some
anti-freezing measures. The temperature of testing water should be higher than surrounding
dew point temperature so as to prevent dew on the boiler surface; but too high temperature also
is not suitable, because if may cause vaporization or too large stress of temperature difference,
in generally, it should be 20
℃～
70
℃
.
6.2 After the boiler is filled with water, raise the pressure step by step to 0.4Mpa, do tightness
inspection one time, if necessary, can tighten the stud of flange, manhole cover and hand-hole
cover for one time.
6.3 Hydraulic testing should be continued slowly, when water pressure is up to working
pressure, should stop raising pressure, check it to see whether there are eater leakage or
abnormal phenomena, and then raise the pressure to testing pressure. Keep it for 20minutes, if
the pressure didn
’
t drop, should make inspection after dropping to working pressure. During
inspection the pressure should kept no change.
If find any leakage should well make record for later repairing when the pressure drop to
atmosphere.
⑦
After hydraulic testing, if find the components meet the following requirements, it should be
considered as good.
7.1 No any water drop and water fog on the metal wall and weld.
7.2 No any residual deformation can be observed by eyes.
⑧
Safety measures and attention items
8.1 It is not permitted to tighten flange stud when the pressure is over than 0.4 Mpa.
8.2 In order to avoid happening dangers because of crowd, should provide special mark while
conducting hydraulic test.
8.3 No stand the opposite of weld hole, flange and valves while exist pressure.
Ⅸ、
Attention for users
The pipeline connected with this boiler should comply with the requirements of national
standard of
《
Safety Supervision Regulation for Special Equipment
》
.
①
If the customer need look up the relevant technical documents of LSS type full automatic oil
(gas)-fired boiler, please indicate the contact no and the general drawing no. If the customer
need look up the boiler quality, please indicate the boiler serial no. If need shift boiler, should
transfer all relevant documents at the same time.
②
Sometime the actual product may have some difference with this operation manual because
of continuous improvement and the alteration of national rule & regulation. For the detail,
please refer to the submitted operation manual for all parts and the latest edition of national
rule & regulation. We are sorry for no additional notice.
The Company reserves the right to improve, without prior notice.
