ANSI 150 级法兰尺寸 PDF 螺纹小口径管道指南

ANSI Class 150 Flange Dimensions Complete Reference

ANSI Class 150 flanges are the most widely used flange type in industrial piping. This guide provides complete dimensional data, PDF references, and selection information for engineers and procurement professionals.

Class 150 Flange Overview

ANSI/ASME B16.5 Class 150 flanges are designed for low to medium pressure applications:

压力等级

• Maximum working pressure: 285 psi at ambient temperature
• Hydrostatic test pressure: 450 psi
• Temperature range: -20°F to 800°F (-29°C to 427°C)
• Pressure decreases at elevated temperatures

Common Materials

• Carbon Steel: ASTM A105, A350 LF2
• Stainless Steel: A182 F304/304L, F316/316L
• Alloy Steel: A182 F11, F22, F91
• Duplex: A182 F51, F53

Complete Dimension Tables

NPS 1/2 to NPS 24 Class 150 Dimensions

NPS	DN	OD	不列颠哥伦比亚省	螺栓	孔洞	厚
1/2	15	3.50	2.38	4	0.62	0.44
3/4	20	3.88	2.75	4	0.62	0.50
1	25	4.25	3.12	4	0.62	0.56
1.1/4	32	4.62	3.50	4	0.62	0.56
1.1/2	40	5.00	3.88	4	0.62	0.62
2	50	6.00	4.75	4	0.75	0.62
2.1/2	65	7.00	5.50	4	0.75	0.69
3	80	7.50	6.00	4	0.75	0.75
4	100	9.00	7.50	8	0.75	0.81
5	125	10.00	8.50	8	0.75	0.88
6	150	11.00	9.50	8	0.88	0.94
8	200	13.50	11.75	8	0.88	1.06
10	250	16.00	14.25	12	0.88	1.12
12	300	19.00	17.00	12	1.00	1.12
14	350	21.00	18.75	12	1.12	1.19
16	400	23.50	21.25	16	1.12	1.31
18	450	25.00	22.75	16	1.25	1.44
20	500	27.50	25.00	20	1.25	1.56
24	600	32.00	29.50	20	1.38	1.69

Note: All dimensions in inches. OD=Outside Diameter, BC=Bolt Circle, Hole=Bolt Hole Diameter, Thick=Flange Thickness

用于小口径管道的螺纹法兰

Threaded flanges are ideal for small diameter piping where welding is impractical:

尺寸范围

• Available: NPS 1/2 to NPS 4 (DN15 to DN100)
• Pressure classes: 150, 300, 600, 900, 1500, 2500
• Thread types: NPT, BSP, PT

应用

• 仪器连接
• Sample points
• Drain and vent lines
• 临时设施
• Hazardous areas (no hot work)
• 压缩空气系统
• 配水

Installation Tips

1. Clean threads on both flange and pipe
2. Apply PTFE tape or thread compound
3. Hand-tighten first, then wrench
4. Leave 1-2 threads exposed
5. Do not overtighten

法兰维修和加工服务

专业维修服务可延长法兰寿命，降低更换成本：

维修能力

• Face Resurfacing: Repair damaged sealing surfaces
• Bore Machining: Restore proper pipe fit
• Bolt Hole Repair: Fix stripped or damaged holes
• Weld Overlay: Build up worn surfaces
• Re-drilling: Modify bolt patterns

何时维修与更换

• Minor surface damage: Repair
• Severe corrosion: Replace
• Cracked flange: Replace
• Dimensional out of tolerance: Repair or replace

Carbon Steel Flange Suppliers

Finding reliable suppliers ensures quality and competitive pricing:

Supplier Selection Criteria

1. Manufacturing capabilities and certifications
2. Material traceability (MTR available)
3. Quality control procedures
4. Production capacity and lead times
5. Export experience and references
6. After-sales support

Price Indicators

• Raw material costs (steel prices)
• Manufacturing complexity
• 表面处理要求
• Quantity and size
• Certification requirements

Stainless Steel Flange Manufacturers by Country

Major Manufacturing Regions

• China: Largest producer, competitive pricing
• India: Growing capacity, good quality
• Italy: Premium quality, higher cost
• USA: Domestic supply, quick delivery
• Japan: High precision, excellent quality

船用耐腐蚀法兰

Marine environments require superior corrosion resistance:

推荐材料

• 316/316L: General marine applications
• 2205 Duplex: Offshore platforms
• 2507 Super Duplex: Severe conditions
• 904L: Chemical tankers
• Aluminum Bronze: Propeller shafts

保护措施

• Cathodic protection systems
• Protective coatings
• Regular inspection and maintenance
• Sacrificial anodes

Download Resources

• ASME B16.5 dimension charts (PDF)
• Material selection guides
• Installation procedures
• Inspection checklists

Songhai Flange supplies ANSI Class 150 flanges in all sizes with complete dimensional certification. Threaded flanges available for small bore applications. Contact us for repair services and marine-grade corrosion resistant options.

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