Burnham K50 manual Recommended Piping to BUILT-IN Tankless Heaters, Open GAS Train Cartons

Fig. 27

RECOMMENDED PIPING TO

BUILT-IN TANKLESS HEATERS

36.OPEN GAS TRAIN CARTON(S)

CONNECT GAS TRAIN(S) TO ELBOW ON END OF MANIFOLD(S) according to the Gas Trains on pages

96, 97, 98, 99, 100, 101 or 102.

PRESSURE TESTING of gas service piping must be done before connecting to the boiler gas train. Test for leaks by introducing, from an isolated source, air or inert gas to the piping. Piping shall withstand 3 PSI gage pressure for a period of not less than 10 minutes without showing any drop in pressure.

37.A DRIP LEG SHOULD BE PROVIDED IN THE VERTICAL DROP TO EACH GAS TRAIN, see Fig.

1. An additional Manual Shut-off valve and ground joint union, as show in Fig. 1, should be installed in the piping to each gas train for ease of servicing.

CONNECT GAS SERVICE FROM METER TO GAS TRAIN in accordance with the requirements of the authority having jurisdiction or, in the absence of such

TABLE I - NATURAL GAS

Maximum Capacity of Piping in Cubic Feet of Gas Per Hour

(Based on a Pressure Drop of 0.3” Water

and 0.6 Specific Gravity)

Pipe		NOMINAL IRON PIPE SIZE IPS INCHES
Length
	¾	1	1¼	1½	2	2½	3	4
in Feet
10	278	520	1050	1600	3050	4800	8500	17500
20	190	350	730	1100	2100	3300	5900	12000
30	152	285	590	890	1650	2700	4700	9700
40	130	245	500	760	1450	2300	4100	8300
50	115	215	440	670	1270	2000	3600	7400
60	105	195	400	610	1150	1850	3250	6800
70	96	180	370	560	1050	1700	3000	6200
80	90	170	350	530	990	1600	2800	5800
90	84	160	320	490	930	1500	2600	5400
100	79	150	305	460	870	1400	2500	5100
125	72	130	275	410	78	1250	2200	4500
150	64	12	250	380	710	1130	2000	4100
175	59	110	225	350	650	1050	1850	3800
200	55	100	210	320	610	980	1700	3500

TABLE II

Multipliers to be used with Table I when Pressure Drop is not 0.3”

Pressure Drop	Multiplier
0.1	.577
0.2	.815
0.5	1.29
1.0	1.83
0.3	1.00

TABLE III

Multipliers to be used with Tables I and II for
Specific Gravity Other than 0.60
Specific Gravity	Correction Factors
.50	1.10
.55	1.04
.60	1.00
.65	.96
.70	.93

requirements to the –

USA – “National Fuel Gas Code, ANSI Z223.1”.

CANADA – “Installation Codes for Natural and LP Gas Burning Appliances and Equipment, CAN/B149.1 &

.2”.

The size of the gas train(s) is no criteria as to the size of the service from the meter to the gas train(s). Sizing of the service is dependent on:

a.Required supply of gas in cu. ft./hr. input of boiler in BTUH

= heat value of gas, BTU/cu. ft.

b. Allowable loss of pressure in piping to obtain minimum input pressure indicated on rating label of boiler.

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