为什么正确的法兰螺栓扭矩可防止代价高昂的泄漏?
螺栓扭矩不正确是法兰连接故障的主要原因。使用正确的扭矩可确保垫片的适当压缩,防止停机和安全事故的发生。.
目标扭矩计算公式
ASME PCC-1 附录 K 公式: T = K x D x F / N
- T = 每个螺栓的目标扭矩
- K = 螺母系数(螺纹摩擦力)
- D = 螺栓公称直径
- F = 所需螺栓总载荷
- N = 螺栓数量
坚果因子值
- 无润滑碳钢:K = 0.20
- 钼基润滑剂:K = 0.13-0.15
- 聚四氟乙烯涂层螺柱:K = 0.10
参考扭矩值(润滑螺纹)
150 级法兰
| NPS | 螺栓尺寸 | 螺栓 | 扭矩(英尺-磅) |
|---|---|---|---|
| 1/2 | 1/2-13 | 4 | 15 |
| 2 | 5/8-11 | 4 | 25 |
| 6 | 3/4-10 | 8 | 45 |
| 8 | 7/8-9 | 8 | 60 |
| 12 | 7/8-9 | 12 | 60 |
300 级法兰
| NPS | 螺栓尺寸 | 螺栓 | 扭矩(英尺-磅) |
|---|---|---|---|
| 1/2 | 1/2-13 | 4 | 20 |
| 2 | 3/4-10 | 4 | 45 |
| 6 | 7/8-9 | 8 | 90 |
| 8 | 1-8 | 8 | 120 |
| 12 | 1-1/8-8 | 12 | 160 |
4 道拧紧程序
- 通过 1:30% 扭矩下的星形图案
- 通过 2:60% 扭矩下的星形图案
- 通过 3:100% 扭矩下的星形图案
- 通过 4:100% 的循环模式,直到不旋转为止
常见错误
- 螺柱上没有润滑剂
- 跳过多通道序列
- 混合螺栓等级
- 重复使用旧垫圈
联系松海法兰 扭矩规格和技术文件。.
您可能还喜欢
DIN Flanges vs ANSI Flange: ANSI Class 150, PN Rating and Selection Guide'>
Flange Coupling Guide: Coupling Flange Type, Flanged Coupler and Shaft Applications'>
What Is an Orifice Flange? Orifice in Piping, Orifice Pipe and Flow Measurement Guide'>
DIN Flanges vs ANSI Flange: ANSI Class 150, PN Rating and Selection Guide
A practical guide comparing DIN flanges and ANSI flange standards, including ANSI Class 150, PN meaning, flange rating ANSI systems, bolt patterns, dimensions and selection tips.
阅读 260 - 评论 0
-
2026-10-09
Flange Coupling Guide: Coupling Flange Type, Flanged Coupler and Shaft Applications
A practical guide to flange coupling, coupling flange type selection, flanged coupler structure, flange shaft coupling applications, installation and maintenance.
Read 271 · Comments 0
-
2026-10-09
What Is an Orifice Flange? Orifice in Piping, Orifice Pipe and Flow Measurement Guide
A practical guide explaining what an orifice flange is, how an orifice in piping works, orifice pipe flow measurement, pressure taps, orifice plates and selection tips.
Read 274 · Comments 0
-
2026-10-08
