CleaverBrooks CBEX Elite, Operation And Maintenance

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750-368
CBEX Elite 100-1200 HP 3-13
3.9 — Preparation for Extended Layup
expanded tubes to leak. Draining the unit too quickly may cause the baking of deposits that may be present on
the heating surfaces. Some heat, however, may be desirable to dry out the interior of the boiler.
If the internal inspection is being made at the request of an authorized inspector, it is advisable to ask the inspec-
tor 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. Ade-
quately 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
corrosion.
There are two methods of storage: wet or dry. Your local Cleaver-Brooks authorized representative can recom-
mend 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
To avoid the hazard of electrical shock, we recommend the use of a low voltage flashlight during an internal inspec-
tion. Preferably, inspectors should work in pairs. Failure to follow these instructions could result in serious injury or
death.
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Warning