Speed Queen Drying Tumblers SCB50EG - Manual (Page 45)

43
M412616
1 2 3 4 5 6 7 8 9
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SAMPLE CALCULATIONS:
Equivalent Length = Total length of main gas supply pipe from
the gas meter to the far end of the tumbler dryers.
= 25' + 19' (7.6 m + 5.8 m) gas supply pipe.
= 44' (13.4 m) Total Gas Liner
Using the table in Figure 22, the main supply pipe diameter should be 2" (5.08 cm).
GAS
FURNACE
(120,000 BTU/HR.)
GAS WATER
HEATERS
(400,000 BTU/HR. each)
MAIN
REGULATOR
GAS TUMBLER DRYERS
(75,000 BTU/HR. each)
GAS
METER
NOTE: See BTU/HR. rating
on dryer nameplate.
19' (5.8 m)
25' (7.6 m)
PRESSURE
REGULATOR
Total BTU/HR = The sum of the BTU/HR. of all
tumblers being fed by the main
gas supply pipe.
= 9 x 75,000
= 675,000 BTU/HR.
19' (5.8 m)
GAS SPACE
HEATERS
(70,000 BTU/HR. each)
Example of Gas Loop Piping
Figure 20
GAS
METER
IMPORTANT: Gas loop piping must be installed
as illustrated to equalize gas pressure for all
tumblers connected to single gas service.
Other gas using appliances should be
connected upstream from loop.
IMPORTANT: Line pressure must be maintained at 6-1/2"
±
1-1/2" water column inches (1.62
±
.37 kPa) for Natural Gas
(11
±
.3 water column inches for L.P. Gas) (2.74
±
.07 kPa) with all gas appliances running (tumblers, water heaters, space
heaters, furnace, etc.).
An in-line pressure regulator may be required on Natural Gas models if the line pressure exceeds eight water column inches
(2.00 kPa) pressure with all gas appliances firing.
GAS LINE
PRESSURE TAP
TUMBLERS
ONE INCH
(2.54 cm)
PIPE
GAS LOOP NOTE: Minimum pipe size to
tumbler is 1/2" (1.27 cm)
GAS SPACE HEATER
GAS
SHUT-OFF
VALVES
PRESSURE
REGULATOR
(If required)
GAS WATER
HEATERS
MAIN
REGULATOR
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Example of Gas Supply Piping
Figure 21