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7.2
Maintenance
The maintenance and inspection intervals must be defined by the operating company according to the
operating conditions and the national regulations.
The manufacturer's general recommendations for the maintenance and inspection of the valve are given
in the table below and are based on the national standards of the country of manufacture.
Inspection and maintenance intervals
Description
Inspection
Functional testing
External inspection
Internal inspection
Strength test
7.3
Fault table
Fault
Leak at the stem
Leaking lateral
connections
Body leaking
Diverter plug valve
cannot be switched
over
Operating instructions
Recommended intervals
Interval
During start-up
Annually
Every 2 years
Every 5 years or ≥ 500
loading cycles
Every 10 years
Cause
Gland nut loose
Packing gland defective
Fit on the stem damaged
Inadequate seals
Blind plug / bolted-on safety
valves loose
Lateral connections cracked
Discontinuity/gas cavity open
Gland nut overtightened
Thread seized
Lever lock not removed
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Scope
Visual inspection
of the diverter plug valve for
damage:
of the valving marking for
legibility;
Leak-tightness
at the packing gland;
of the valve seat;
at the connections;
at the plug screw;
Test of the opening and closing
functions of the diverter plug
valve.
Test the opening and
closing functions of the
diverter plug valve including a
visual inspection.
Function and tightness test
including visual inspection.
Replacement of all sealing
elements, including a function and
tightness test as well as a visual
inspection.
Replacement of all sealing
elements, including a function and
tightness test as well as an
inspection.
Remedy
Retighten the gland nut
Replace the diverter plug valve
Replace the diverter plug valve
Seal with suitable sealants
Tighten to the specified torques
Replace the diverter plug valve
Replace the diverter plug valve
Loosen gland nut
Tightness must still be ensured
Replace the diverter plug valve
Remove lever lock
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