Sensus 243-12-4 - Materials of Construction; Full Open Capacity; Other Cases; How to Order

22
Materials of Construction
Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cast Iron
D
iaphragm Case . . . . . . . . . . . . . . . . . . . . Die Cast Aluminum Alloy
Diaphragm . . . . . . . . . . . . . . . . . . . Buna-N with Nylon Fabric Insert
Diaphragm Pans. . . . . . . . . . . . . . . . . . . . . . . . . . . Zinc Plated Steel
D
iaphragm Coupling . . . . . . . . . . . . . . . . . . . . . . . . Zinc Die Casting
Orifice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Brass
Valve. . . . . . . . . . . . . . . . . . . Buna-N Soft Seat in Aluminum Holder
S
tem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Brass
Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Zinc Plated Steel
O-Rings and Tetra Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . Buna-N
A
djustment Spring Button & Seal Cap, Std. . . . . . . . . . . . . . . . . . . .
Zinc Die Casting
Adjustment Screw, 243-8HP . . . . . . . . . . . . . . . . . Zinc Plated Steel
Cover, 243-8HP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cast Iron
Seal Cap, 243-8HP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cast Iron
Full Open Capacity
Use the following formula for the full open capacity of 243
regulators.
1. Q = K Po(P
1
-P
0
). . . . . . . . . . . . . . . (for less than 1.894
2. Q = . . . . . . . . . . . . . . . . . . . . . (for greater than 1.894
Q = maximum capacity of the regulator (in SCFH of 0.6 specific
gravity natural gas).
K = the
“K” factor, the regulator constant (from the table)
P
1
= absolute inlet pressure (psia).
P
0
= absolute outlet pressure (psia).
When sizing relief valves for use with 243 regulators, use
full open
capacity
. Do not use capacity from capacity tables pages 8
through 19.
Orifice Size-in.
K
.207”
90 132 292 520 1100 1800 2480
KP
1
2
P
1
P
0
P
1
P
0
Other Cases
243 Regulators are mainly used on natural gas. However, they
perform equally as well on LP gas, nitrogen, dry CO
2
, air and oth-
ers. For capacities, multiply the table values on pages 8 thru 19
by the following correction factors:
While used primarily on natural gas services, Model 243 regulators
perform equally as well on LPG vapor, air, CO
2
, nitrogen and other
inert gas applications. Please contact your Sensus Metering Sys-
tems representative for special construction which may be avail-
able for certain corrosive gases.
OTHER GASES CORRECTION FACTOR
Air (Specific Gravity 1.0) 0.77
Propane (Specific Gravity 1.53) 0.63
1350 BTU Propane-Air Mix (1.20) 0.71
Nitrogen (Specific Gravity 0.97) 0.79
Dry Carbon Dioxide 0.63
(Specific Gravity 1.52)
For other noncorrosive gases:
CORRECTION FACTOR =
0.6
Specific Gravity
of the Gas
How to Order
Specify:
1. Pipe size and model
number (page 2).
2. Screwed or flanged
connections
3. Mounting position
4. Orifice size and valve angle.
5. Inlet pressure (also
maximum and minimum
if available)
6. Outlet pressure setting
7. Capacity required (scfh)
8. Type of gas (natural gas,
propane, etc.)
9. Spring part number
1
⁄4”
3
⁄8”
1
⁄2”
3
⁄4”1”1
1
⁄4”