Waterside Care and Requirements
3-14
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
If the internal inspection is being made at the request of an authorized inspector, it is advisable to ask the inspector
to observe the conditions prior to cleaning or flushing of waterside surfaces.
Be certain that a supply of manhole and handhole gaskets is available, along with any other gaskets or items needed
to place the unit back into operation after inspection.
Have available information on the boiler design, dimensions, generating capacity, operating pressure or tempera-
ture, time in service, defects found previously, and any repairs or modifications. Also have available for reference
records of previous inspections.
Be prepared to perform any testing required by the inspector including a hydrostatic test.
After proper cooling and draining of the vessel, flush out the waterside with a high pressure water hose. Remove
any scale or deposits from the waterside surfaces and check for internal or external corrosion and leakage.
The fireside surface should also be thoroughly cleaned so that metal surfaces, welds, joints, tube ends, fittings and
any previous repairs can be readily checked.
Be sure that steam valves, and valves to expansion tank (hot water), feedwater valves, blowoff valves, all fuel valves,
and electrical switches are shut off prior to opening handholes, manhole, and front or rear doors. Adequately vent
the pressure vessel prior to entry.
Clean out the low-water cutoff piping, the water level controls and cross-connecting pipes. Replace the water gauge
glass and clean out the water cocks. Also check and clean the drain and the blowdown valves and piping.
Check all water and steam piping and valves for leaks, wear, corrosion, and other damage. Replace or repair as
required.
3.9 — Preparation for Extended Layup
Many boilers used for seasonal loads or for standby service may have extended periods of non-use. Special atten-
tion must be given to idle boilers so that neither waterside nor fireside surfaces are allowed to deteriorate from cor-
rosion.
There are two methods of storage: wet or dry. Your local Cleaver-Brooks authorized representative can recommend
the better method depending upon circumstances in the particular installation.
Although pollution control regulations may continue to limit the permissible sulphur content of fuel oils, care must
be taken to avoid corrosion problems that sulphur can cause, especially in a boiler that is seasonally shut down.
Dormant periods, and even frequent shutdowns, expose the fireside surfaces to condensation below the dew point
during its off cycle. Moisture and any sulphur residue can form an acid solution. Under certain conditions, and
especially in areas with high humidity, the corrosive effect of the acid will be serious enough to eat through or
severely damage boiler tubes or other metal heating surfaces during the time that a boiler is out of service.
Summary of Contents for 4WI
Page 46: ...Burner Operation and Control 2 22 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 62: ...Waterside Care and Requirements 3 16 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 70: ...Sequence of Operation 4 8 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 114: ...Adjustment Procedures 6 28 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
