Recommended Piping To Built-In Tankless Heaters; Natural Gas - Burnham 5B Series Installation And Operation Manual

SecTiON iii – iNSTALLATiON iNSTRUcTiONS (continued)
RECOMMENDED PIPING TO
BUILT-IN TANKLESS HEATERS
must be mounted so that cut off point is above
marking on Lowest Permissible Water Line Plate.
f. I nstall Pressure Safety Relief Valve, using fittings
furnished, into 1-1/2" pipe tapping in upper corner
of End Section. DO NOT INSTALL A SHUTOFF
VALVE BETWEEN SAFETY RELIEF VALVE
AND BOILER. Safety Relief Valve must be
installed in a Vertical Position with handle up.
g. Install Boiler Drain Valve into one of unused return
tappings that has been bushed to ¾". Drain Valve
can also be installed in return piping, preferably
in leg of tee that is located in line with return
connection on Boiler.
35.
CONNECT PIPING TO BUILT-IN HEATER(S) IF
USED, see Fig. 30, top - left side of this page.
FIG. 30
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
in Feet
10 278 520 1050
20 190 350 730
30 152 285 590
40 130 245 500
50 115 215 440
60 105 195 400
70 96 180 370
80 90 170 350
90 84 160 320
100 79 150 305
125 72 130 275
150 64 12 250
175 59 110 225
200 55 100 210
TABLe ii
Multipliers to be used with Table I when Pressure Drop is not 0.3"
Pressure Drop
0.1
0.2
0.5
1.0
0.3
TABLe iii
Multipliers to be used with Tables I and II for
Specific Gravity Other than 0.60
Specific Gravity
.50
.55
.60
.65
.70
36.
OPEN GAS TRAIN CARTON(S)
CONNECT GAS TRAIN(S) TO ELBOW ON END OF
MANIFOLD(S) according to the Gas Trains on pages
86, 87, 88, 89, 90, 91 or 92.
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
1½ 2 2½ 3
1600 3050 4800 8500
1100 2100 3300 5900
890 1650 2700 4700
760 1450 2300 4100
670 1270 2000 3600
610 1150 1850 3250
560 1050 1700 3000
530 990 1600 2800
490 930 1500 2600
460 870 1400 2500
410 78 1250 2200
380 710 1130 2000
350 650 1050 1850
320 610 980 1700
Multiplier
.577
.815
1.29
1.83
1.00
Correction Factors
1.10
1.04
1.00
.96
.93
4
17500
12000
9700
8300
7400
6800
6200
5800
5400
5100
4500
4100
3800
3500
31