COZY VFT201 Installation And Operation Instructions Manual page 7

SEE FOLLOWING CHARTS FROM NFPN54, ANSI Z223.1 TO DETEILMINE PROPER GAS SUPPLY LINE SIZE REQUIRED TO SUPPOI{I' TOTAL BTU REQUIRE-
IMENTS.
NATURAL GAS
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psig or Less and a Pressure Drop of 0.5 Inch Water Colun-m.
(Based on a 0.60 Specific Gravi U Gas)
--a
Nominal LENGTH OF PIPE, FEET
Iron Pipe Internal
Size, Diametm;
Inches Inches 10 20 30 40 50 60 70 80 90 100 125 150 175 200
V4 0.364 43 29 24 20 18 16 15 14 13 12 11 10 9 8
3/8 0.493 95 65 52 45 40 36 33 31 29 27 24 22 20 19
V2 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35
3¢_ 0.824 3(10 250 200 170 151 138 125 118 110 103 93 84 77 72
1 1.049 680 465 375 320 285 2(:0 240 220 205 195 175 160 145 135
1-1/4 1.38 1400 950 770 6(_) 5_ 530 490 4(-l) 430 400 360 325 300 280
1-1/2" 1.61 2100 1460 1180 990 900 810 750 690 650 620 550 500 400 430
2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
2-1/2 2.469 6300 4350 3520 3C_)0 2650 2400 2250 2050 1950 1850 1650 15(X) 1370 1280
3 3.068 11000 7.7 6250 5300 4750 43(X) 39(X) 37(X) 3450 3250 2950 2650 2450 2280
4 4.026 23(X)0 158(X) 128(X) 10900 9.7 8800 8100 7500 7200 6700 6000 5500 5000 46(X)
* Pipe and Tubing Selection
Total piping length - 84 |Yet (use table 4 @ 90 fYet)
From a to b, demand 200,000 - 38,000 65,000 35.000
: 338,000 Bl'Uihr. use 1" pipe.
From b to c, demand 38,000 65.000 - 35,000
138,000 BTUihr; use _;" pipe or 7/8" tubing.
From c to d, demand : 65,000 35,000
100.000 BTUibr; use }g' pipe or }g' tubing.
From d to e, demand 35,000 BTU/hr; use %" pipe or 5/8" tubing.
From b to E demand : 200,000 BFUihr; use /" pipe.
From c to g, demand 38.000 BTUihr; use I,)" pipe or 5/8" tubing.
From d to h, demand 65,000 BTU/hr; use %" pipe or _A" tubing.
Example 2.
Determine the sizes of piping or robing required lbr the two-stage L.P.
(;as installation shown.
26 5 8
/qrst Stage Feet
Re_ulatol Furnace
200.000
Second Stage
Regulator
Total first stage piping length = 26 feet; first stage regulator setting is 10 PSIG (use Table 1 or 3,
@ 30 lk'et)
From aa to a, demand 338,000 BTU hr; use _=" pipe, _2"
robing, or 'A" T plastic pipe.
*lnlbrmation li'om - REGO PRODUCTS
"I.P GAS SI'RVICI'MAN'S MANUAl2'
) ) ) )
SEE FOI_I_OWINGPAGE FOIl III E SIZING CIIARI S FOR 1ROI ANE GAS.
Total second stage piping length = 58 feet (use table 4, @
60
feet).
From a to b. demand 338,000 BlUihr; use I" pipe.
From b to c, demand 138,000 BTUihr; use _;*" pipe or 7/8"
tubing.
From c to d. demand 100,000 BlUihr; use !_" pipe or 2_"
tubing.
From d to e, demand 35,000 BTUihr; use !2" pipe or '2"
tubing.
From b to f demand 200,000 BTU/hr; use _a" pipe.
From c to g, demand 38,000 BTUihr; use !2" pipe or 5/8"
tubinm