Clayton Steam Generator model EO-100-1M
PAGE 39 / 70
Instruction Manual, doc.nr.: MAN18206 Rev A PSC
8.7.2
SUPPLEMENTAL
SAFETY,
CONTROL
AND
MONITORING
DEVICES
FOR
STEAM
INSTALLATIONS WITHOUT PERMANENT SUPERVISION .
Following precautions shall be taken and supplemental monitoring, control and safety devices are to be
provided for as required in EN 12952-7/8 for steam plants operated without permanent supervision:
It shall be ensured that no harmful matter
(e.g. oil, grease, seawater)
can enter the feedwater or generator
system
•
The hardness of the feedwater shall be monitored automatically and
•
In case of totally demineralized feedwater the conductivity shall be monitored automatically
•
The conductivity shall be monitored permanently for non-demineralized feedwater.
•
If the feedwater limit values for hardness and conductivity prescribed in the feedwater manual are
exceeded, the heat supply shall be cut off and locked by a device. This cut off and lock-out function is
integrated into the electrical safety circuit of the steam generator through a ‘break contact from
external conditions’.
The periodic inspection and testing or checking of the functioning of these devices is specified in Table
8.7-2:
Installation devices for different modes of operation and their periodic testing.
IMPORTANT NOTES - WARNINGS:
The operation and setting of all alarm and operating switches, as well as setting and operation of safety
and relief valves should be checked by a qualified Clayton technician
a) Any periodic testing should be carefully planned, preferably simultaneously with the official
periodic testing and inspection as required by the national legislation on steam plants supervision
b) All periodic inspections and tests of safety devices shall be recorded on the maintenance log
sheets, or in the generator log book or other appropriate reports that are to be kept available for the
Authorities for the lifetime of the generator
c) Periodic testing of safety and control devices shall only be done by qualified technicians of
Clayton, preferably without changing original set points. When this is not possible, set-points may
only be changed in presence of the AIA and/or a qualified technician of Clayton and the broken
seal(s) shall be replaced after testing and readjusting to the original settings
d) Restarting the generator after a shut down by a safety device is only allowed and possible after the
anomaly is solved and the reset button is activated. The normal starting sequence for taking a
generator into operation shall be followed
e) When during the inspection and testing any mal functioning devices are found, they shall
immediately be replaced. Only original genuine parts may be used for replacement of any of the
safety devices. Any alternatives shall be approved for the same application, range and
qualifications and shall have the required certificates and/or declarations. All such replacements
shall be reported in the logbook or other recordings
f)
For residual risks see chapter 3: Safety instructions – section rest risks.
Содержание EO-100-1M
Страница 31: ...Clayton Steam Generator model EO 100 1M PAGE 31 70 Instruction Manual doc nr MAN18206 Rev A PSC ...
Страница 32: ...Clayton Steam Generator model EO 100 1M PAGE 32 70 Instruction Manual doc nr MAN18206 Rev A PSC ...
Страница 33: ...Clayton Steam Generator model EO 100 1M PAGE 33 70 Instruction Manual doc nr MAN18206 Rev A PSC End Chapter 7 ...