Lochinvar 000 - 500 Installation And Service Manual page 14

Nominal
Iron Pipe
Size, Inches
10 20
3/4 369 256
1 697 477
1 1/4 1,400 974
1 1/2 2,150 1,500 1,210 1,020
2 4,100 2,820 2,260 1,950
2 1/2 6,460 4,460 3,610 3,100
3 11,200 7,900 6,400 5,400
4 23,500 16,100 13,100 11,100 10,000 9,000 8,300 7,690
Maximum Capacity of Pipe in Thousands of BTU's per hour for gas pressures of 13.5 Inches Water Col umn
(0.5 PSIG) or less and a pressure drop of 0.5 Inch Water Column (Based on the calorific value of Natural Gas,
3
1025 Btu/ft @ 0.60 Specific Gravity)
GAS PIPING
FIG. 16 Gas Line Connection
All gas connections must be made with pipe joint
com pound resistant to the action of liquefied pe tro leum
and natural gas. All piping must comply with local
codes. Tubing installations must com ply with ap proved
standards and practices. Reference Figure 16 for a
typical installation.
Install Piping to Control
1. The gas line should be a separate line direct
from the meter unless the existing gas line is of
MULTIPLE APPLIANCE INSTALLATIONS
GAS PIPING SIZE CHART
Length of Pipe in Straight Feet
30 40 50
205 174 155 141
384 328 292 267
789 677 595 543
923 830
1,720 1,560 1,440 1,330
2,720 2,460 2,310 2,100
4,870 4,410 4,000 3,800
TABLE - H
60 70 80 90
128 121 113
246 226 210
502 472 441
769 707 666
1,250 1,180
2,000 1,900
3,540 3,300
7,380 6,870
sufficient capacity. Verify pipe size with your gas
sup pli er.
2. Use new, properly threaded black iron pipe free
from chips. If tubing is used, make sure the ends
are cut squared, deburred and clean. All tubing
bends must be smooth and without deformation.
Avoid flexible gas connections. Internal diameter
of flexible lines may not provide proper volume of
gas.
3. Run pipe or tubing to the gas valve or manifold
inlet. If tubing is used, obtain a tube to pipe
coupling to connect the tubing to the gas valve
or man i fold inlet.
4. Thread pipe the proper amount for insertion into gas
valve or manifold inlet as shown in Table H.
DO NOT OVER TIGHTEN. Over tightening may
result in damage to the gas valves. Valve distortion
or malfunction may result if the pipe is inserted too
deeply into the gas valve.
5. Apply a moderate amount of good quality pipe
compound (DO NOT use Teflon tape) to pipe
only, leaving two end threads bare.
6. Remove seal over gas valve or manifold inlet.
7. Connect pipe to gas valve or manifold inlet. Use
wrench to square ends of the gas valve (FIG. 17).
14
100 125 150 175
106 95 86
200 179 164 149
410 369 333 308
636 564 513 472
1,100 974 871
1,700 1,540 1,400 1,300
3,000 2,720 2,500 2,340
6,150 5,640 5,130 4,720
200
79 74
138
287
441
820