Table 4.6 Checklist Analysis of Cooling Water Chlorination System
Do all raw materials continue to conform to original specifications? Yes. The drums are
ordered with the same chlorine specification used since startup.
Is each receipt of material checked? Yes. The supplier once sent a cylinder of phosgene. Since
then, a test is performed by the maintenance staff. In addition, the fusible plugs are inspected for
evidence of leakage, before a cylinder is hooked up.
Does the operating staff have access to Material Safety Data Sheets? Yes. All staff are familiar
with the process chemistry, including the hazards of Cl2.
Is fire fighting and safety equipment properly located and maintained? Yes. This system is on
a concrete building roof. Because there are no flammable materials involved in this system, if a
fire occurs, there will be no special effort by fire fighting crews to concentrate on the roof area.
Has all equipment been inspected as scheduled? Yes. The maintenance personnel have
inspected the equipment in the process area according to company inspection standards.
Have pressure relief valves been inspected as scheduled? Yes.
Have rupture disks been inspected (for having blown) as scheduled? Not applicable.
Are the proper maintenance materials (parts, etc.) available? Yes. They include spare pigtails
for the supply cylinders, as well as a rotameter and a pressure check valve. Other items must be
Is there an emergency cylinder capping kit? Yes.
Are the operating procedures current? Yes.
Are the operators following the operating procedures? No. It is reported that some staff do not
always check the cylinder's fusible plugs for leaks. Staff should be re-reminded of this
procedural item and its importance.
Are new operating staff trained properly? Yes. Training includes a review of the PrHA for this
process and familiarization with MSDSs.
How are communications handled at shift change? There are relatively few open items at the
end of a shift. The chlorine cylinders need to be changed only about once every 45 days. If an
empty chlorine cylinder needs replaced, it has proven to be easy to schedule the change during a
Is housekeeping acceptable? Yes.
Are safe work permits being used? Yes.
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