罐壁人孔装于油罐下部，人可以由此进出。本产品出厂时不带加强板，
Shell manhole series shall be set on lower tank shell course for people and going out or the tank.the reinforcing plate of manhole is out of scope of supply.
罐壁人孔“尺寸表” Dimendion table：
|
标准号 Standard |
规格 Size |
材质 Material |
压力 Pressure |
|
HG21541~21527-92 |
DN450~DN600 |
碳素钢 |
0.6-2.5MPa |
|
低合金钢 |
|||
|
HG21954~21600-1999 |
DN450~DN600 |
全不锈钢 |
0.6-2.5MPa |
|
衬不锈钢 |
罐壁人孔“订货须知” Order Construction：
订货时请注明标准号、压力及规格。
Please give clear indication of Standard，pressure and size.
备注 Remarks：
人孔分为 Manhole into：
1. 紧急泄压人孔 Emergency relief manhole；
2. 防爆阻火呼吸人孔 Type breather manholes；
3. 罐顶人孔 The top of the tank manhole；
4. 罐壁人孔 The manhole of the tank wall；
5. 带芯人孔 The belt core manhole
罐壁人孔只是人孔的一个分支，他的主要作用为 The manhole of the tank wall is a branch of manhole, his main role：
1. 方便安装与维修的人进出；
Easy to install and repair people in and out;
2. 方便维护人员清理杂质。
Convenient maintenance personnel to clean impurities。