天然气管道选型
根据燃气负荷、管长和允许压降选择天然气管道尺寸。
概述
本页面提供了钢制和铜制低压天然气管道选型数据。容量表允许您根据所需热负荷 (kW) 和等效管段长度选择管道直径，并考虑了典型管件损失。
设计条件
所有容量值假定以下参数：
- 最大压力：小于 10 kPa（低压系统）
- 允许压降：管道段两端 125 Pa
- 管件系数：1.5（在实测直管长度上增加 50%）
- 气体热值：37 MJ/m³
等效管道长度
为考虑弯头、三通和阀门的压力损失，请在查表前计算等效管道长度：
这 50% 的增量代表住宅和轻型商业安装的典型管件负荷。对于管件数量异常多的系统，请查阅当地规范以确定现场特定系数。
钢管 — Schedule 40
管道尺寸 (in) | (kW) | (kW) | (kW) | (kW) | (kW) |
|---|---|---|---|---|---|
| 1/2 | 41 | 28 | 19 | 13 | 9 |
| 3/4 | 86 | 59 | 40 | 28 | 19 |
| 1 | 161 | 110 | 76 | 52 | 35 |
| 1 1/4 | 331 | 228 | 155 | 108 | 72 |
| 1 1/2 | 495 | 340 | 235 | 161 | 108 |
| 2 | 956 | 655 | 450 | 310 | 210 |
| 3 | 2690 | 1850 | 1270 | 875 | 590 |
| 4 | 5490 | 3775 | 2595 | 1780 | 1200 |
| 6 | 16090 | 11055 | 7600 | 5220 | 3510 |
| 8 | 33050 | 22715 | 15615 | 10730 | 7210 |
来源: engineeringtoolbox.com
天然气管道容量图
下方表格和图可用于天然气管道选型。以 pdf 文件下载天然气管道选型图。来源页面还引用了英寸-磅选型工作流程的天然气 — 管道选型 — 英制值。
- 以 pdf 文件下载天然气管道选型图。
Natural 气体 管道 Capacity vs Equivalent 管道 长度
Imperial Values and Unit Converter
The original source references Natural Gas - Pipe Sizing - Imperial Values. This converter preserves the inch-pound workflow by converting heat load, gas volume flow, pipe length, pressure drop, and gas heating value.
Natural 气体 管道 Sizing 单位 转换器
Copper Tubing — Type K
Type K has the thickest walls of the copper tubing grades and is specified for underground and higher-pressure service.
(in) | (kW) | (kW) | (kW) | (kW) |
|---|---|---|---|---|
| 1/4 (3/8 OD) | 6 | 4 | 3 | 2 |
| 3/8 (1/2 OD) | 13 | 9 | 6 | 4 |
| 1/2 (5/8 OD) | 26 | 18 | 12 | 8 |
| 5/8 (3/4 OD) | 46 | 31 | 21 | 15 |
| 3/4 (7/8 OD) | 65 | 45 | 31 | 21 |
| 1 (1 1/8 OD) | 140 | 96 | 66 | 45 |
| 1 1/4 (1 3/8 OD) | 250 | 170 | 119 | 82 |
来源: engineeringtoolbox.com
Copper Tubing — Type L
Type L has a medium wall thickness and is the most common grade for interior residential gas piping where copper is permitted by local code.
(in) | (kW) | (kW) | (kW) | (kW) |
|---|---|---|---|---|
| 1/4 (3/8 OD) | 7 | 5 | 3 | 2 |
| 3/8 (1/2 OD) | 15 | 10 | 7 | 5 |
| 1/2 (5/8 OD) | 29 | 20 | 13 | 9 |
| 5/8 (3/4 OD) | 49 | 33 | 23 | 16 |
| 3/4 (7/8 OD) | 75 | 51 | 35 | 24 |
| 1 (1 1/8 OD) | 150 | 104 | 71 | 49 |
| 1 1/4 (1 3/8 OD) | 260 | 180 | 124 | 85 |
来源: engineeringtoolbox.com
还原的原始源表
以下表格还原自原始来源页面，以保留完整的参考数据。
Natural Gas - Sizing of Low Pressure Steel Pipes - Schedule 40
管道 长度 (m) | 管道 长度 (m) | 管道 长度 (m) | 管道 长度 (m) | 管道 长度 (m) | Capacity of 管道 (kW) |
|---|---|---|---|---|---|
| 3 | 6 | 12 | 24 | 50 | — |
| 1/2 | 41 | 28 | 19 | 13 | 9 |
| 3/4 | 86 | 59 | 40 | 28 | 19 |
| 1 | 161 | 110 | 76 | 52 | 35 |
| 1 1/4 | 331 | 228 | 155 | 108 | 72 |
| 1 1/2 | 495 | 340 | 235 | 161 | 108 |
| 2 | 956 | 655 | 450 | 310 | 210 |
| 2 1/2 | 1520 | 1045 | 720 | 495 | 330 |
| 3 | 2690 | 1850 | 1270 | 875 | 590 |
| 4 | 5490 | 3775 | 2595 | 1780 | 1200 |
| 5 | 9935 | 6830 | 4695 | 3225 | 2170 |
| 6 | 16090 | 11055 | 7600 | 5220 | 3510 |
| 8 | 33050 | 22715 | 15615 | 10730 | 7210 |
来源: engineeringtoolbox.com
Natural Gas - Sizing of Low Pressure Copper Tubing - type K
管道 长度 (m) | 管道 长度 (m) | 管道 长度 (m) | 管道 长度 (m) | Capacity of 管道 (kW) |
|---|---|---|---|---|
| 3 | 6 | 12 | 24 | — |
| 1/4 (3/8) | 6 | 4 | 3 | 2 |
| 3/8 (1/2) | 13 | 9 | 6 | 4 |
| 1/2 (5/8) | 26 | 18 | 12 | 8 |
| 5/8 (3/4) | 46 | 31 | 21 | 15 |
| 3/4 (7/8) | 65 | 45 | 31 | 21 |
| 1 (1 1/8) | 140 | 96 | 66 | 45 |
| 1 1/4 (1 3/8) | 250 | 170 | 119 | 82 |
来源: engineeringtoolbox.com
Natural Gas - Sizing of Low Pressure Copper Tubing - type L
管道 长度 (m) | 管道 长度 (m) | 管道 长度 (m) | 管道 长度 (m) | Capacity of 管道 (kW) |
|---|---|---|---|---|
| 3 | 6 | 12 | 24 | — |
| 1/4 (3/8) | 7 | 5 | 3 | 2 |
| 3/8 (1/2) | 15 | 10 | 7 | 5 |
| 1/2 (5/8) | 29 | 20 | 13 | 9 |
| 5/8 (3/4) | 49 | 33 | 23 | 16 |
| 3/4 (7/8) | 75 | 51 | 35 | 24 |
| 1 (1 1/8) | 150 | 104 | 71 | 49 |
| 1 1/4 (1 3/8) | 260 | 180 | 124 | 85 |
来源: engineeringtoolbox.com
原始源图
以下原始来源图像予以保留，以免丢失视觉参考资料。当图像包含图表或表格数据时，其提取值已呈现在页面的表格、计算器或交互式图表中；其余图像保留为视觉来源参考。
工程要点
Natural 气体 载荷 and Equivalent 长度
Material selection — Steel Schedule 40 is standard for main lines, commercial runs, and underground service where strength and larger diameters are required. Copper Type K is preferred underground or where higher pressure ratings are needed. Copper Type L is the default for interior residential branch lines, subject to local code approval.
Wall thickness effect — Type L copper delivers slightly higher capacity than Type K for the same nominal size because its thinner wall yields a larger internal bore. Verify actual ID when close to a sizing boundary.
Fittings factor — The 1.5 factor (50 % length addition) covers a moderate number of standard elbows and tees. Systems with many close-spaced fittings, long manifold runs, or restrictive devices (regulators, meters) should use a higher factor or perform a detailed equivalent-length calculation for each fitting.
Sizing method — These tables use a fixed 125 Pa pressure drop. If your allowable pressure drop differs, the capacity values scale roughly with the square root of the pressure-drop ratio. Always confirm with the applicable gas code (e.g., IFGC, EN 1775, AS/NZS 5601).
Pipe degradation — Steel pipes can corrode internally over time, reducing effective capacity. Copper is more resistant but can suffer dezincification in aggressive water soils. Periodic inspection and conservative sizing margins are recommended.