AquaStar 125B NGS GAS Line Sizing For Natural GAS, For LP GAS, Maximum Capacity of Semi-Rigid

GAS CONNECTIONS and Gas Regulator

NOTE: The Aquastar 125 B”S” is supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line. See figure 5. Failure to install the gas regulator as shown in figure 5 will be a violation of CSA certification of the unit. The regulator supplied with the heater is preset for the gas shown on the rating plate to the correct pressure. It is an appliance level regulator designed for (low inlet) pressure (less than 1/2 Psig or 15” W.C.) DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line.

GAS LINE SIZING

FOR NATURAL GAS

Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column.

(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.

Follow boxed numbers for piping just one Aquastar 125BS (example: 3/4” B.I. Natural Gas pipe for 30 ft. will handle 152,000 btu’s). For multiple appliances combine the total btu input load and then refer to applicable chart below.

Nominal
Iron
Pipe	Internal					Length of Black Iron Pipe, Feet
Size,	Diameter
inches	inches	10	20	30	40	50	60	70	80	90	100 125	150 175 200

1/4

3/8

1/2

3/4

1

11/4

11/2

2

21/2

3

4

0.364

0.493

0.622

0.824

1.049

1.380

1.610

2.067

2.469

3.068

4.026

32	22	18	15
72	49	40	34
132	92	73	63
278	190	152	130
520	350	285	245
1050	730	590	500
1600	1100	890	760
3050	2100	1650	1450
4800	3300	2700	2300
8500	5900	4700	4100
17,500	12,000	9,700	8,300

14	12	11	11	10	9	8	8	7	6
30	27	25	23	22	21	18	17	15	14
56	50	46	43	40	38	34	31	28	26
115	105	96	90	84	79	72	64	59	55
215	195	180	170	160	150	130	120	110	100
440	400	370	350	320	305	275	250	225	210
670	610	560	530	490	460	410	380	350	320
1270	1150	1050	990	930	870	780	710	650	610
2000	1850	1700	1600	1500	1400	1250	1130	1050	980
3600	3250	3000	2800	2600	2500	2200	2000	1850	1700
7,400	6,80	6,200	5,800	5,400	5,100	4,500	4,100	3,800	3500

FOR LP GAS

Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet Pressure) (Based on a Pressure Drop of 0.5 Inch Wa- ter Column).

Fig. 4

nominal
Iron Pipe							Black Iron Pipe
Size,							Length of Pipe, Feet
Inches		10	20	30	40		50	60	70	80	90	100	125	150
					129		114	103	96	89	83	78	69	63
	1/2	275	189	152
	3/4	567	693	315
						267	237	217	196	185	173	162	146	132
	1	107	732	590		504	448	409	378	346	322	307	275	252
1 1/4		220	149	121	103		913	834	771	724	677	630	567	511
1 1/2		330	229	185	155		141	127	118	108	102	976	866	787
2		622	433	346	299		264	239	220	204	192	1811	1606	1496

	Outside							Copper
	Diameter,						Length of Tubing, Feet
Maximum Capacity of Semi-Rigid	Inch
			10		20	30		40	50	60	70	80	90	100
Tubing in Thousands of BTU per Hour of
	3/8		39		26	21		19	_	_	_	_	_	_
Undiluted Liquified Petroleum Gases (at 11	1/2		92		62	50		41	37	35	31	29	27	26
inches Water Column Inlet Pressure)
		5/8		199	131	107		90	79	72	67	62	59	55
(Based on a Pressure Drop of 0.5 Inch Water		3/4	329		216		181	145	131	121	112	104	95	90
		7/8	501		346	277		233	198	187	164	155	146	138
Column)

*Source National Fuel Gas Code NFPA 54, ANSI Z223.1 - No Additional Allowance is necessary for an ordinary number of fittings

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