Gas Piping Sizing Work Sheet:
1. Determine the distance, in feet,
from gas meter to most remote gas outlet.
2. GO TO UPC TABLE 12-3:
Enter the column for most remote outlet distance in feet. Use next number up if there is
no exact match.
3. Go down the column of most remote distance and move down to match the CFH of the gas
outlet.
4. For APPLIANCES DEMAND in CFH TABLE,
5. Move to the far left column of the Table and read the required pipe size. This is the
pipe size needed to serve the outlet or combination of outlets.
6. Repeat the procedure for every other outlet or combination outlets to size the piping.
7. To size pipe sections serving multiple outlets: Add the CFH of each outlet, calculate
the distance to remote outlet, determine pipe size.
Example Sizing:
1. Most remote outlet from meter is at 89 ft. Use the 90 ft. Column.
2. Outlet
"A" has a demand of 59 CFH. From
Table 12-3, Section 1 piping= 3/4". (59 falls above 53 CFH and less than 111, use
the 111 value for pipe size= 3/4").
| Outlet # |
Demand in CFH |
Pipe Section # |
Calculated Pipe Size |
| A |
59 |
1 |
3/4" |
| B |
32 |
2 |
1/2" |
| |
A+B=59+32=91 |
3 |
3/4" |
| C |
100 |
4 |
3/4" |
| D |
59 |
5 |
3/4" |
| |
A+B+C+D=59+32+100+59=250 |
6 |
1 1/4" |
| E |
No outlet |
7 |
0 |
| |
250 |
8 |
1 1/4" |
| F |
23 |
9 |
1/2" |
| |
A-F= 250+23= 273 |
10 |
1 1/4" |
RESULT: GAS PIPE
SECTIONS SIZE PER LAST COLUMN IN TABLE ABOVE. TOTAL GAS DEMAND IS 273 CFH.
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Let me do my
own work sheet now!
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Gas Piping Sizing:
1. Most remote outlet from meter is
at (xxx)ft. Use the (xxx)ft. Column.
2. Gas Sizing Table.
3. Typical Gas Appliances Demand Table.
| Outlet # |
Demand in CFH |
Pipe Section # |
Calculated Pipe Size |
| A |
(______) |
1 |
(_______) |
| B |
(______) |
2 |
(_______) |
| |
(_____________) |
3 |
(_______) |
| C |
(______) |
4 |
(_______) |
| D |
(______) |
5 |
(_______) |
| |
(______________) |
6 |
(_______) |
| E |
(______) |
7 |
(_______) |
| |
(______) |
8 |
(_______) |
| F |
(______) |
9 |
(_______) |
| |
(______________) |
10 |
(_______) |
|
top
|
Gas Pipes Sizing Based on
Most Remote Outlet and demand in CFH
Pipes
Size |
|
20
|
30
|
40
|
50
|
60
|
70
|
80
|
90
|
100
|
125
|
150
|
200
|
250
|
Dist. |
| 1/2" |
119 |
96 |
82 |
73 |
66 |
61 |
56 |
53 |
50 |
44 |
40 |
34 |
30 |
| 3/4" |
249 |
200 |
171 |
152 |
138 |
127 |
118 |
111 |
104 |
93 |
84 |
72 |
64 |
| 1" |
470 |
377 |
323 |
286 |
259 |
239 |
222 |
208 |
197 |
174 |
158 |
135 |
120 |
| 1.25" |
965 |
775 |
663 |
588 |
532 |
490 |
456 |
428 |
404 |
358 |
324 |
278 |
246 |
| 1.5" |
1445 |
1161 |
993 |
880 |
798 |
734 |
683 |
641 |
605 |
536 |
486 |
416 |
369 |
| 2" |
2784 |
2235 |
1913 |
1696 |
1536 |
1413 |
1315 |
1234 |
1165 |
1033 |
936 |
801 |
710 |
| 2.5" |
4437 |
3563 |
3049 |
2703 |
2449 |
2253 |
2096 |
1966 |
1857 |
1646 |
1492 |
1277 |
1131 |
| 3" |
7843 |
6299 |
5391 |
4778 |
4329 |
3983 |
3705 |
3476 |
3284 |
2910 |
2637 |
2257 |
2000 |
| 3.5" |
11484 |
9222 |
7893 |
6995 |
6338 |
5831 |
5425 |
5090 |
4808 |
4261 |
3861 |
3304 |
2929 |
| 4" |
15998 |
12847 |
10995 |
9745 |
8830 |
8123 |
7557 |
7091 |
6698 |
5936 |
5378 |
4603 |
4080 |
1. Table Limitations: Most remote
outlet= 250 ft. Regular Pressure Gas.
2. To use: Determine the most
remote outlet distance from the gas meter in ft. Use the next number up if not an exact
match. i.e. If the distance is 45; use the 50 ft. column for distance. Move down the
column. Depending on the demand of each outlet and combination demands, depending on
layout, size the gas piping. Work your way towards the meter.
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Min. Demand of Typ. Gas Appliances
| Appliance |
Demand
(Btu/hr) |
Demand
(CFH)* |
| Air Conditioners (3 ton) |
60,000 |
55.0 |
| Air Conditioners (5 ton) |
100,000 |
91.0 |
| Barbecue (residential) |
50,000 |
45.5 |
| Domestic ClothesDryer |
35,000 |
32.0 |
| Domestic Gas Range |
65,000 |
59.0 |
| Domestic Recessed Oven Section |
25,000 |
23.0 |
| Domestic
Recessed Top Burner Section |
40,000 |
36.5 |
| Fireplace LogLighter (residential) |
25,000 |
23.0 |
| Gas
Engines (per horsepower) |
10,000 |
9.0 |
| Gas
Refrigerator |
3,000 |
3.0 |
| Steam
Boilers (per horsepower) |
50,000 |
45.5 |
| Storage
Waterheater (up to 30 gal.) |
30,000 |
27.5 |
Storage Waterheater (40-50 gal.) |
50,000 |
45.5 |
Ref: UPC, Table 12-1
* To convert Btu/hr to CFH (cubic feet/hr), divide by 1100
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