TABLE 5: PIPE SIZING1
Length in Feet | Nominal Iron Pipe Size | |
|
| |
| 1 in. | |
|
|
|
10 | 520 | 1,050 |
|
|
|
20 | 350 | 730 |
|
|
|
30 | 285 | 590 |
|
|
|
40 | 245 | 500 |
|
|
|
50 | 215 | 440 |
|
|
|
60 | 195 | 400 |
|
|
|
70 | 180 | 370 |
|
|
|
80 | 170 | 350 |
|
|
|
90 | 160 | 320 |
|
|
|
100 | 150 | 305 |
|
|
|
1Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3 inch water column and 0.6 specific gravity gas.)
FIGURE 6 : EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
Natural gas may contain some propane. Propane, being an excellent solvent, will quickly dissolve white lead or most standard commercial com- pounds. Therefore, a special pipe compound must be applied when wrought iron or steel pipe is used. Shellac base compounds such as Gaskolac or Stalastic, and compounds such as Rectorseal #5, Cyde's or John Crane may be used.
FIGURE 7 : BOTTOM SUPPLY CONNECTION EXTERNAL
L.P. UNITS, TANKS AND PIPING
All gas heat units are shipped from the factory equipped for natural gas use only. The unit may be converted in the field for use with L.P./propane gas with accessory kit model num- ber 1NP0437.
All L.P./propane gas equipment must conform to the safety standards of the National Fire Protection Association.
For satisfactory operation, L.P./propane gas pressure must be 8.8 inch W.C at the unit under full load. Maintaining proper gas pressure depends on three main factors:
1.The vaporization rate which depends on (a) the tempera- ture of the liquid and (b) the wetted surface area of the container or containers.
2.The proper pressure regulation.
3.The pressure drop in the lines between regulators and between the second stage regulator and the appliance. Pipe size required will depend on the length of the pipe run and the total load of all appliances.
Complete information regarding tank sizing for vaporization, recommended regulator settings, and pipe sizing is available from most regulator manufacturers and L.P./propane gas suppliers.
L.P./propane gas is an excellent solvent and special pipe compound must be used when assembling piping for this gas as it will quickly dissolve white lead or most standard com- mercial compounds. Shellac base compounds such as Rec- torseal #5 are satisfactory for this type of gas.
10 | Unitary Products |
