行业组件数据 · 2026

人孔

Manways are access openings in fractionating columns for inspection, maintenance, and cleaning.

技术定义与适配语境
典型 人孔 会按材料、尺寸公差、适配关系和失效风险在 化学制造 中评估。

Manways are standardized, flanged openings integrated into the shell of fractionating columns and other pressure vessels. They provide safe, secure entry points for personnel to perform internal inspections, maintenance tasks, cleaning operations, and component installation/removal. Designed to withstand the column's operating pressure and temperature, they feature a removable cover (blind flange or door) sealed with a gasket and secured by bolting.

组件规格

定义
Manways are standardized, flanged openings integrated into the shell of fractionating columns and other pressure vessels. They provide safe, secure entry points for personnel to perform internal inspections, maintenance tasks, cleaning operations, and component installation/removal. Designed to withstand the column's operating pressure and temperature, they feature a removable cover (blind flange or door) sealed with a gasket and secured by bolting.
工作原理
The manway functions as a pressure-sealed portal. Its cover is bolted to a flanged nozzle welded to the column shell. A gasket between the mating flanges creates a leak-tight seal when the bolts are properly torqued, maintaining the vessel's pressure integrity. The design ensures the cover can be safely removed when the vessel is depressurized, isolated, and purged, following lockout/tagout procedures.
材料
Typically carbon steel (ASTM A516 Gr. 70)stainless steel (ASTM A240 316/316L)or alloy steels (e.g.ASTM A387 for high-temperature service). Gaskets: spiral-wound (stainless steel with graphite/filler)ring-type joint (RTJ)or non-asbestos compressed fiberselected based on pressuretemperatureand process fluid compatibility.
Hinge Type
Lug, pin, or davit arm (for heavier covers)
Flange Face
Raised face (RF), Ring-type joint (RTJ)
Standard Sizes
DN 450 (18"), DN 500 (20"), DN 600 (24")
Pressure Rating
ASME 150#, 300#, 600#
Design Temperature
-29°C to 538°C (-20°F to 1000°F)
标准
ASME BPVC Section VIIIEN 13445API 620/650

行业分类与别名

人孔 的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Improper bolt torque or sequence during reassembly->Gasket leak under operating pressure->Use calibrated torque wrenches, follow cross-torquing patterns, and perform post-assembly leak tests.
Corrosion or erosion of flange sealing surface->Inability to achieve seal, requiring weld repair or replacement->Regular NDT inspection, specify corrosion-resistant materials, and apply protective coatings if compatible.
Failure to follow lockout/tagout and vessel entry procedures->Personnel injury from unexpected pressure/chemical release->Strict adherence to OSHA/company confined space entry protocols, including gas testing and attendant monitoring.

工业生态与工程逻辑

0
Confined space entry hazards
1
Pressure release during unbolting
2
Gasket failure causing leaks
3
Falling object hazards from cover
4
Corrosion weakening the flange

合规与检测

tolerance
Flange flatness within 0.8 mm per ASME B16.5, bolt hole alignment within 1.6 mm
test method
Hydrostatic test at 1.5x design pressure per ASME BPVC, pneumatic leak test with soap solution, visual and NDT (PT/MT) of welds.

制造该组件的工厂

来自 CNFX 组件能力表的相关制造商资料。

制造商列表用于前期研究和供应商能力理解,不代表认证、排名或交易担保。

采购评估维度

不是客户评论,也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例,不代表真实客户评分、具体国家买家反馈或实时询盘。

相关组件

常见问题

What is the minimum size for a manway?

Typically DN 450 (18 inches) to allow safe personnel entry with tools, as per industry practice and OSHA/confined space regulations.

How often should manway gaskets be replaced?

Replace gaskets every time the cover is opened, or per manufacturer's recommendation, to prevent leaks and ensure pressure integrity.

Can a manway be used as a normal process connection?

No, manways are designed for intermittent human access, not continuous process flow. Using them as nozzles can compromise safety and vessel design.

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CNFX Industrial Component Index · 化学制造

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URN:CNFX:ME:UNIT:MANWAYS