The following tables are very essential in selecting the correct size of pipe or tubing for use in conveying gas in various quantities and distances. These tables have been prepared especially for Liquefied Petroleum Gases and strict adherence to them will result in more efficient LP Gas installations. These capacities are based on gas with a specific gravity of 1.5 under pressure of approximately 6 oz. and a pressure drop of .5 inches of water, and may be used satisfactorily for both Butane and Propane installations.

TABLE NO. 1 CAPACITY PER HOUR IN B.T.U. THROUGH PIPES OF VARIOUS SIZES AND LENGTHS

Length of pipe in feet	1/2" BTU Per Hr.	3/4" BTU Per Hr.	1" BTU Per Hr.	1 1/4" BTU Per Hr.	1 1/2" BTU Per Hr.	2" BTU Per Hr.	3" BTU Per Hr.	4" BTU Per Hr.
10	260,000	550,000	1,000,000	2,000,000	3,100,000	6,145,000	17,783,000	35,000,000
15	210,000	432,000	790,000	1,500,000	2,400,000	5,100,000	13,650,000	28,250,000
20	179,000	375,000	710,000	1,400,000	2,150,000	3,900,000	12,500,000	24,700,000
25	157,000	338,000	634,000	1,150,000	1,980,000	3,400,000	11,000,000	22,200,000
30	142,000	300,000	600,000	1,040,000	1,710,000	3,100,000	9,200,000	19,100,000
35	136,000	292,000	556,000	1,000,000	1,680,000	3,000,000	8,800,000	18,020,000
40	129,000	275,000	516,000	980,000	1,580,000	2,963,000	8,200,000	17,300,000
50	113,000	247,000	460,000	948,000	1,400,000	2,400,000	7,600,000	15,600,000
60	106,000	216,000	445,000	780,000	1,220,000	2,000,000	7,200,000	14,250,000
75	92,000	192,000	398,000	690,000	1,080,000	1,920,000	6,050,000	12,750,000
90	86,000	174,000	365,000	635,000	986,000	1,800,000	5,550,000	11,570,000
105	80,000	160,000	330,000	587,000	920,000	1,750,000	5,200,000	10,800,000
120	76,000	151,000	318,000	547,000	865,000	1,620,000	4,940,000	9,900,000
150	70,000	137,000	285,000	491,000	780,000	1,585,000	4,260,000	8,870,000
180	66,000	126,000	254,000	444,000	730,000	1,430,000	3,970,000	8,100,000
210	62,000	116,000	239,000	413,000	650,000	1,335,000	3,650,000	7,600,000
240	58,000	108,000	222,000	388,000	613,000	1,260,000	3,420,000	6,990,000
270	54,000	103,000	206,000	365,000	580,000	1,175,000	3,240,000	6,660,000
300	50,000	96,000	199,000	350,000	546,000	1,125,000	3,100,000	6,350,000
450	42,000	81,000	159,000	284,000	444,000	905,000	2,720,000	5,070,000
600	36,000	68,000	138,000	239,000	380,000	776,000	2,140,000	4,450,000

TABLE NO. 2

CAPACITY PER HOUR IN B.T.U. THROUGH TUBING (TYPE "K") OF VARIOUS SIZES AND LENGTHS

Length	1/4"	3/8"	1/2"	5/8"	3/4"	1"	1 1/4"	1 1/2"	2"
of Tubing	BTU	BTU	BTU	BTU	BTU	BTU	BTU	BTU	BTU
in Feet	Per Hr.	Per Hr.	Per Hr.	Per Hr.	Per Hr.	Per Hr.	Per Hr.	Per Hr.	Per Hr.
10	52,000	98,000	196,500	350,000	486,000	986,000	1,600,000	2,500,000	5,400,000
15	47,000	88,000	172,000	292,000	412,000	856,000	1,300,000	2,100,000	4,500,000
20	37,500	72,000	144,000	246,000	348,000	726,000	1,000,000	1,800,000	3,800,000
25	34,000	63,500	128,000	216,000	306,000	648,000	950,000	1,500,000	3,300,000
30	30,000	59,000	116,000	198,000	280,000	580,000	850,000	1,300,000	3,000,000
35	28,500	54,000	112,000	190,000	271,000	568,000	800,000	1,200,000	2,800,000
40	27,000	52,000	106,000	180,000	256,000	530,000	775,000	1,100,000	2,700,000
45	26,000	49,000	98,000	168,000	242,000	492,000	750,000	1,000,000	2,600,000
50	24,000	46,000	92,500	159,500	234,000	462,000	725,000	975,000	2,450,000
55	23,000	45,000	89,000	152,500	215,000	446,500	700,000	950,000	2,300,000
60	22,000	42,500	84,000	148,000	208,000	434,500	675,000	925,000	2,150,000
70	21,000	40,500	75,500	135,500	189,500	388,000	650,000	900,000	2,000,000
80	19,500	36,500	72,000	124,500	172,000	360,000	625,000	850,000	1,900,000
90	19,000	35,000	70,000	118,000	168,000	342,000	600,000	825,000	1,800,000
100	17,000	33,500	64,500	106,000	154,500	320,000	525,000	800,000	1,700,000
120	15,500	31,000	60,000	98,000	142,000	296,000	500,000	775,000	1,500,000
150	14,500	26,000	52,000	92,000	124,000	262,000	450,000	700,000	1,300,000
200	12,000	23,000	46,000	76,000	112,000	225,000	375,000	575,000	1,000,000

TABLE NO. 3

EQUIVALENT LENGTH OF PIPE FOR VARIOUS TYPE VALVES AND FITTINGS

PIPE SIZE	GATE VALVE	GLOBE VALVE	ANGLE VALVE	90 DEG. ELBOW	45 DEG. ELBOW	TEE STRAIGHT THROUGH	TEE SIDE OUTLET
1/2	.5	10	5	1	6	.7	2.5
3/4	.6	15	7	1.5	1	1.1	3.5
1	.8	20	10	2	1.5	1.8	4.5
1 1/4	1	25	12	2.5	1.8	2	5.5
1 1/2	1.2	30	15	3	2	2.5	7
2	1.8	40	20	4	2.5	3	9
2 1/2	2	50	25	5	3	4	11
3	2.5	60	30	6	4	4.5	13.5
3 1/2	2.7	70	35	7	4.5	5	16
4	3	80	40	8	5	6	18
5	3.7	100	50	10	6.5	7.5	23

TABLE NO. 4

MAXIMUM PERMITTED FILLING DENSITY

	Aboveground Containers		Under- ground Containers
Specific Gravity at 60 °	0 to 1200* Gallons Total Water Cap.	Over 1200 Gallons Total Water Cap.	All Capacities
.473 - .480	38 percent	41 percent	42 percent
.481 - .488	39 percent	42 percent	43 percent
.489 - .495	40 percent	43 percent	44 percent
.496 - .503	41 percent	44 percent	45 percent
.504 - .510	42 percent	45 percent	46 percent
.511 - .519	43 percent	46 percent	47 percent
.520 - .527	44 percent	47 percent	48 percent
.528 - .536	45 percent	48 percent	49 percent
.537 - .544	46 percent	49 percent	50 percent
.545 - .552	47 percent	50 percent	51 percent
.553 - .560	48 percent	51 percent	52 percent
.561 - .568	49 percent	52 percent	53 percent
.569 - .576	50 percent	53 percent	54 percent
.577 - .584	51 percent	54 percent	55 percent
.585 - .592	52 percent	55 percent	56 percent
.593 - .600	53 percent	56 percent	57 percent
.601 - .608	54 percent	57 percent	58 percent
.609 - .617	55 percent	58 percent	59 percent
.618 - .626	56 percent	59 percent	60 percent
.627 - .634	57 percent	60 percent	61 percent

TABLE NO. 5

MINIMUM BTU CAPACITIES OF UNDERGROUND

LPG TANKS

Minimum capacity in BTU per hour, based on tank being one third (1/3) full of twenty (20) percent Propane mixture and a ground temper- ature of 40° F.

Size of Tank	Capacity in BTU per hour
100	55,000
150	91,000
200	122,000
250	151,000
300	182,000
350	213,000
400	242,000
450	273,000
500	302,000
550	333,000
600	364,000
650	394,000
700	424,000
750	455,000
800	486,000
850	515,000
900	546,000
950	577,000
1000	606,000

The above capacities are furnished as a guide to be used in determining the SIZE and TYPE of system to satisfactorily handle a given BTU heat load.

The vapor generating capacity of an underground Butane gas system can be determined only in relation to known factors. These factors are: The mixture or percentage of the component gases, the ground heat, and the level of the liquid in the tank. The variation of any of these factors shown in the above chart will proportionately vary in the BTU capacities shown.

These capacities are also based on a CONSTANT OPERATION at the given load.

Liquid Volume Correction Factors

SPECIFIC GRAVITIES AT 60°F/60°F
Observed Temperature Degrees Fahrenheit	0.500	Propane 0.5079	0.510	0.520	0.530	0.540	0.550	0.560	no-Butane 0.5631	0.570	0.580	n-Butane 0.5844	0.590
VOLUME CORRECTION FACTORS
-50	1.160	1.155	1.153	1.146	1.140	1.133	1.127	1.122	1.120	1.116	1.111	1.108	1.106
-45	1.153	1.148	1.146	1.140	1.134	1.128	1.122	1.117	1.115	1.111	1.106	1.103	1.101
-40	1.147	1.142	1.140	1.134	1.128	1.122	1.117	1.111	1.110	1.106	1.101	1.099	1.097
-35	1.140	1.135	1.134	1.128	1.122	1.116	1.112	1.106	1.105	1.101	1.096	1.094	1.092
-30	1.134	1.129	1.128	1.122	1.116	1.111	1.106	1.101	1.100	1.096	1.092	1.090	1.088
-25	1.127	1.122	1.121	1.115	1.110	1.105	1.100	1.095	1.094	1.091	1.087	1.085	1.083
-20	1.120	1.115	1.114	1.109	1.104	1.099	1.095	1.090	1.089	1.086	1.082	1.080	1.079
-15	1.112	1.109	1.107	1.102	1.097	1.093	1.089	1.084	1.083	1.080	1.077	1.075	1.074
-10	1.105	1.102	1.100	1.095	1.091	1.087	1.083	1.079	1.078	1.075	1.072	1.071	1.069
-5	1.098	1.094	1.094	1.089	1.085	1.081	1.077	1.074	1.073	1.070	1.067	1.066	1.065
0	1.092	1.088	1.088	1.084	1.080	1.076	1.073	1.069	1.068	1.066	1.063	1.062	1.061
2	1.089	1.086	1.085	1.081	1.077	1.074	1.070	1.067	1.066	1.064	1.061	1.060	1.059
4	1.086	1.083	1.082	1.079	1.075	1.071	1.068	1.065	1.064	1.062	1.059	1.058	1.057
6	1.084	1.080	1.080	1.076	1.072	1.069	1.065	1.062	1.061	1.059	1.057	1.055	1.054
8	1.081	1.078	1.077	1.074	1.070	1.066	1.063	1.060	1.059	1.057	1.055	1.053	1.052
10	1.078	1.075	1.074	1.071	1.067	1.064	1.061	1.058	1.057	1.055	1.053	1.051	1.050
12	1.075	1.072	1.071	1.068	1.064	1.061	1.059	1.056	1.055	1.053	1.051	1.049	1.048
14	1.072	1.070	1.069	1.066	1.062	1.059	1.056	1.053	1.053	1.051	1.049	1.047	1.046
16	1.070	1.067	1.066	1.063	1.060	1.056	1.054	1.051	1.050	1.048	1.046	1.045	1.044
18	1.067	1.065	1.064	1.061	1.057	1.054	1.051	1.049	1.048	1.046	1.044	1.043	1.042
20	1.064	1.062	1.061	1.058	1.054	1.051	1.049	1.046	1.046	1.044	1.042	1.041	1.040
22	1.061	1.059	1.058	1.055	1.052	1.049	1.046	1.044	1.044	1.042	1.040	1.039	1.038
24	1.058	1.056	1.055	1.052	1.049	1.046	1.044	1.042	1.042	1.040	1.038	1.037	1.036
26	1.055	1.053	1.052	1.049	1.047	1.044	1.042	1.039	1.039	1.037	1.036	1.036	1.034
28	1.052	1.050	1.049	1.047	1.044	1.041	1.039	1.037	1.037	1.035	1.034	1.034	1.032
30	1.049	1.047	1.046	1.044	1.041	1.039	1.037	1.035	1.035	1.033	1.032	1.032	1.030
32	1.046	1.044	1.043	1.041	1.038	1.036	1.035	1.033	1.033	1.031	1.030	1.030	1.028
34	1.043	1.041	1.040	1.038	1.036	1.034	1.032	1.031	1.030	1.029	1.028	1.028	1.026
36	1.039	1.038	1.037	1.035	1.033	1.031	1.030	1.028	1.028	1.027	1.025	1.025	1.024
38	1.036	1.035	1.034	1.032	1.031	1.029	1.027	1.026	1.025	1.025	1.023	1.023	1.022
40	1.033	1.032	1.031	1.029	1.028	1.026	1.025	1.024	1.023	1.023	1.010	1.021	1.020
42	1.030	1.029	1.028	1.027	1.025	1.024	1.023	1.022	1.021	1.021	1.019	1.019	1.018
44	1.027	1.026	1.025	1.023	1.022	1.021	1.020	1.019	1.019	1.018	1.017	1.017	1.016
46	1.023	1.022	1.022	1.021	1.020	1.018	1.018	1.017	1.016	1.016	1.015	1.015	1.014
48	1.020	1.019	1.019	1.018	1.017	1.016	1.015	1.014	1.014	1.013	1.013	1.013	1.012
50	1.017	1.016	1.016	1.015	1.014	1.013	1.013	1.012	1.012	1.011	1.011	1.011	1.010
52	1.014	1.013	1.012	1.012	1.011	1.010	1.010	1.010	1.009	1.009	1.009	1.009	1.008
54	1.010	1.010	1.009	1.009	1.008	1.008	1.007	1.007	1.007	1.007	1.006	1.006	1.006
56	1.007	1.007	1.006	1.006	1.005	1.005	1.005	1.005	1.005	1.005	1.004	1.004	1.004
58	1.003	1.003	1.003	1.003	1.003	1.003	1.002	1.002	1.002	1.002	1.002	1.002	1.002
60	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000	1.000
62	0.997	0.997	0.997	0.997	0.997	0.997	0.997	0.998	0.998	0.998	0.998	0.998	0.998
64	0.993	0.993	0.994	0.994	0.994	0.994	0.995	0.995	0.995	0.995	0.996	0.996	0.996
66	0.990	0.990	0.990	0.990	0.991	0.992	0.992	0.993	0.993	0.993	0.993	0.993	0.993
68	0.986	0.986	0.987	0.987	0.988	0.989	0.990	0.990	0.990	0.990	0.991	0.991	0.991
70	0.983	0.983	0.984	0.984	0.985	0.986	0.987	0.988	0.988	0.988	0.989	0.989	0.989
72	0.979	0.980	0.981	0.981	0.982	0.983	0.984	0.985	0.986	0.986	0.987	0.987	0.987
74	0.976	0.976	0.977	0.978	0.980	0.980	0.982	0.983	0.983	0.984	0.985	0.985	0.985
76	0.972	0.973	0.974	0.975	0.977	0.978	0.979	0.980	0.981	0.981	0.982	0.982	0.983
78	0.969	0.970	0.970	0.972	0.974	0.975	0.977	0.978	0.978	0.979	0.980	0.980	0.981
80	0.965	0.967	0.967	0.969	0.971	0.972	0.974	0.975	0.976	0.977	0.978	0.978	0.979
82	0.961	0.963	0.963	0.966	0.968	0.969	0.971	0.972	0.973	0.974	0.976	0.976	0.977
84	0.957	0.959	0.960	0.962	0.965	0.966	0.968	0.970	0.971	0.972	0.974	0.974	0.975
86	0.954	0.956	0.956	0.959	0.961	0.964	0.966	0.967	0.968	0.969	0.971	0.971	0.972
88	0.950	0.952	0.953	0.955	0.958	0.961	0.963	0.965	0.966	0.967	0.969	0.969	0.970
90	0.946	0.949	0.949	0.952	0.955	0.958	0.960	0.962	0.963	0.964	0.967	0.967	0.968
92	0.942	0.945	0.946	0.949	0.952	0.955	0.957	0.959	0.960	0.962	0.964	0.965	0.966
94	0.938	0.941	0.942	0.946	0.949	0.952	0.954	0.957	0.958	0.959	0.962	0.962	0.964
96	0.935	0.938	0.939	0.942	0.946	0.949	0.952	0.954	0.955	0.957	0.959	0.960	0.961
98	0.931	0.934	0.935	0.939	0.943	0.946	0.949	0.952	0.953	0.954	0.957	0.957	0.959
100	0.927	0.930	0.932	0.936	0.940	0.943	0.946	0.949	0.950	0.952	0.954	0.955	0.957
105	0.917	0.920	0.923	0.927	0.931	0.935	0.939	0.943	0.943	0.946	0.949	0.949	0.951
110	0.907	0.911	0.913	0.918	0.923	0.927	0.932	0.936	0.937	0.939	0.943	0.944	0.946
115	0.897	0.902	0.904	0.909	0.915	0.920	0.925	0.930	0.930	0.933	0.937	0.938	0.940
120	0.887	0.892	0.894	0.900	0.907	0.912	0.918	0.923	0.924	0.927	0.931	0.932	0.934
125	0.876	0.881	0.884	0.890	0.898	0.903	0.909	0.916	0.916	0.920	0.925	0.927	0.928
130	0.865	0.871	0.873	0.880	0.888	0.895	0.901	0.908	0.909	0.913	0.918	0.921	0.923
135	0.854	0.861	0.863	0.871	0.879	0.887	0.894	0.901	0.902	0.907	0.912	0.914	0.916
140	0.842	0.850	0.852	0.861	0.870	0.879	0.886	0.893	0.895	0.900	0.905	0.907	0.910