
Bulletin 71.4:66
8
BJ8921-C
A2562
CONTROL LINE
DIGESTER
TANk
GAS TO
FuEL SYSTEM
COMPRESSOR
Figure 5. Type 66R Relief Valve Installation at Outlet of Sewage Treatment Plant Digester Tank
Figure 6. Type 66RR Relief Valve Installation in Vacuum Breaker System
AV9712-D
A2564
POSITIVE PRESSuRE
OR ATMOSPhERE,
OR A LESSER VACuuM
ThAN ThE VACuuM
BEING LIMITED
VACuuM
BEING
LIMITED
VACuuM PuMP
CONTROL LINE
ATMOSPhERE ONLY
INTO DIAPhRAGM
CASE VENT
A Type 66R or 66RR relief valve should be installed
horizontally with the diaphragm casings vertical above
the body. Other orientations will change the relief set
pressure and set pressure range due to the weight of
the internal parts. Typical installations are shown in
Figures 5 and 6.
Connection locations and dimensions are both shown
in Figure 7.
Table 4 gives Type 66R and Table 5 gives Type 66RR
ow capacities at selected set pressures. Flows are
in SCFH (60°F and 14.7 psia) of 0.6 specic gravity
natural gas at 60°F. To determine the equivalent
capacities for air, propane, butane, or nitrogen, multiply
the Table 4 or 5 capacity by the following appropriate
conversion factor: 0.775 for air, 0.628 for propane,
0.548 for butane, or 0.789 for nitrogen. For gases of
other specic gravities, multiply the given capacity by
0.775 and divide by the square root of the appropriate
specic gravity. Then, if capacity is desired in normal
cubic meters per hour (Nm
3
/h) at 0°C and 1,01325 bar,
multiply SCFH by 0.0268.
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