Sterling QVEF User Manual download pdf (Page 7)

Maximum Capacity of Pipe in Cubic Feet of Gas per Hour (Cubic Meters per Hour) for Gas Pressures of 0.5 psig (3.5 kPa) or Less,

and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)

(Based on a 0.60 Speciﬁ c Gravity Gas)

Nominal

Iron Internal Length of Pipe, Feet (meters)

Pipe Size

Dia. 10 20 30 40 50 60 70 80 90 100 125 150 175 200

in. in. (3.0) (6.1) (9.1) (12.2) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)

1/2 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35

(4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) (1.25) (1.13) (1.05) (0.99)

3/4 0.824 360 250 200 170 151 138 125 118 110 103 93 84 77 72

(10.2) (7.08) (5.66) (4.81) (4.28) (3.91) (3.54) (3.34) (3.11) (2.92) (2.63) (2.38) (2.18) (2.04)

1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135

(19.3) (13.2) (10.6) (9.06) (8.07) (7.36) (6.80) (6.23) (5.80) (5.52) (4.96) (4.53) (4.11) (3.82)

1 1/4 1.380 1400 950 770 660 580 530 490 460 430 400 360 325 300 280

(39.6) (26.9) (21.8) (18.7) (16.4) (15.0) (13.9) (13.0) (12.2) (11.3) (10.2) (9.20) (8.50) (7.93)

1 1/2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430

(59.5) (41.3) (33.4) (28.0) (25.5) (22.9) (21.2) (19.5) (18.4) (17.6) (15.6) (14.2) (13.0) (12.2)

2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800

(112) (77.9) (62.3) (53.8) (47.6) (43.0) (39.6) (36.8) (34.5) (32.6) (28.9) (26.9) (24.1) (22.7)

2 1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280

(178) (123) (99.7) (85.0) (75.0) (68.0) (63.7) (58.0) (55.2) (52.4) (46.7) (42.5) (38.8) (36.2)

3 3.068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280

(311) (218) (177) (150) (135) (122) (110) (105) (97.7) (92.0) (83.5) (75.0) (69.4) (64.6)

4 4.026 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600

(651) (447) (362) (309) (275) (249) (229) (212) (204) (190) (170) (156) (142) (130)

GAS SUPPLY PIPING

Table 3 - Gas Pipe Size

1. Determine the required Cu. Ft. / Hr. by dividing the rated heater input by 1000. For SI / Metric measurements: Convert unit Btu. / Hr. to

kilowatts. Multiply the units input (kW) by 0.0965 to determine Cubic Meters / Hour. 2. FOR NATURAL GAS: Select the pipe size directly

from the table. 3. FOR PROPANE GAS: Multiply the Cu. Ft. / Hr. (Cubic Meters per Hour) value by 0.633; then use the table. 4. Refer to

the metric conversion factors listed in General Safety section for more SI unit measurements/conversions.

To avoid equipment damage or possible personal injury, do not connect gas piping

to this unit until a supply line pressure/leak test has been completed. Connecting the unit before

completing the pressure/leak test may damage the unit gas valve and result in a ﬁ re hazard.

Do not rely on a shut off valve to isolate the unit while conducting gas pressure/leak

tests. These valves may not be completely shut off, exposing the unit gas valve to excessive pressure

and damage.

NOTICE: If more than one gas unit heater is to be

served by the same piping arrangement, the total

cubic feet per hour input and length of pipe must be

considered.

NOTICE: If the gas unit heater is to be ﬁ red with LP

gas, see Table 3 or consult the local LP gas dealer

for pipe size information.

NOTICE: HEATER INSTALLATION FOR USE WITH

PROPANE (BOTTLED) GAS MUST BE MADE BY A

QUALIFIED L.P. GAS DEALER OR INSTALLER. HE

WILL ENSURE THAT PROPER JOINT COMPOUNDS

ARE USED FOR MAKING PIPE CONNECTIONS;

THAT AIR IS PURGED FROM LINES; THAT A

THOROUGH TEST IS MADE FOR LEAKS BEFORE

OPERATING HEATER; AND THAT IT IS PROPERLY

CONNECTED TO PROPANE GAS SUPPLY SYSTEM.

Before any connection is made to an existing line

supplying other gas appliances, contact the local gas

company to make certain that the existing line is of

adequate size to handle the combined load.

PIPE SIZING

To provide adequate gas pressure at the gas unit

heater, size the gas piping as follows:

1. Find the cu ft/hr by using the following formula:

Input

Cu ft/hr =

Btu per Cu ft

2. Refer to Table 3. Match “Pipe Run in Feet” with

appropriate “Gas Input - Cu Ft/Hr” ﬁ gure. This ﬁ gure

can then be matched to the pipe size at the end of

the column.

Example: It is determined that a 67 foot (20.4m) run of

gas pipe is required to connect a 200 MBTU gas unit

heater to a 1,000 Btu/cu. ft (0.29 kW) natural gas supply.

200,000 Btu/hr

= 200 Cu ft/hr

1,000 Btu/cu ft

Using Table 3, a 1 inch pipe is needed.

NOTICE: See General Safety Information section for

English/SI (metric) unit conversion factors.

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

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Sterling QVEF User Manual Page 7

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