4
Table 4. Failure Mode Analysis
PART NAME
FAILURE
(WORST CASE)
CAUSE OF
FAILURE
EFFECT REGULATOR TYPE REGULATOR REACTION MODE
Filter
Filter blocked/
clogged
Debris or aromatics
present in the gas
Decrease of feeding
pressure gives
decrease of
motorization pressure
EZHSO Open - - - -
EZH - - - - Close
Pilot Disk Pilot cannot be closed
Debris or aromatics
present in the gas
Increase
motorization
pressure
EZHSO Open - - - -
EZH Open - - - -
Pilot Lower
Diaphragm
Pilot cannot control
Debris or aromatics
present in the gas
Decrease
motorization
pressure
EZHSO Open - - - -
EZH - - - - Close
Pilot Upper
Diaphragm
Pilot cannot feed
the regulator
Debris or aromatics
present in the gas
Decrease
motorization
pressure
EZHSO Open - - - -
EZH - - - - Close
Regulator
Diaphragm
Not proper
performance of
the motorization
pressure chamber
Debris or aromatics
present in the gas
Balancing of
pressures and charge
or discharge of
the motorization
pressure chamber
EZHSO Open - - - -
EZH - - - - Close
Pilot
Frozen Pilot,
Type SA/2 working
Moisture in the gas,
high pressure drop
Type SA/2 loading
upper casing of
regulator, Pilot
not supplying
loading pressure
to lower casing
EZHSO - - - - Close
EZH - - - - Close
R96B
Table 3b. 2:1 Line Flow Coefcients, Regulator with Integrated Whisper III Silencer
TYPES EZH (DN 25 - 100) WITH WHISPER III AND EZHSO (DN 25 - 100) WITH WHISPER III
REDUCTION
SLAM SHUT INTEGRATED (X BODY) WITHOUT SLAM SHUT (E BODY)
DN
25 DN 50 DN 80 DN 100 DN 25 DN 50 DN 80 DN 100
Q
f
0
223 781 1693 2742 255 793 1708 2789
1
215 764 1418 2479 209 716 1172 2438
2
140 603 975 1644 127 566 984 1711
3
87 370 685 1041 81 358 690 1057
C
g
0
433 1516 3285 5320 495 1539 3313 5410
1
417 1482 2751 4810 406 1389 2774 4730
2
273 1169 1892 3190 247 1099 1908 3320
3
168 718 1328 2020 158 695 1339 2050
C
1
0
35.5 37 30.8 31.7 33.8 33.5 30.8 30.4
1
35.4 37.5 33.6 34.1 39.4 34.1 33.6 32.4
2
32.3 39.5 37.1 36.4 39.9 35.7 37.1 35.7
3
32.9 39.4 38.3 37.6 39.9 37.7 38.3 37.3
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