second category vessel 为了有利于压力容器的安全技术管理和监督检查，按《压力容器安全监察规程》的规定，属于下列情况之一者为二类容器：(1)中压容器；(2)剧毒介质的低压容器；(3)易燃或有毒介质的低压反应器和贮运容器；(4)内径小于1m的低压废热锅炉。
公司拥有一、二类压力容器的设计制造资格。
The company has one or two types of pressure vessel design and manufacture of eligibility .
企业具备一、二类压力容器制造资格，是压力容器专业定点生产厂家。
Enterprises have one or two types of pressure vessel manufacturing qualifications, is a professional manufacturer of pressure vessels.
即二类，三类，四类的压力容器中的主承压部件，必须经过特定的产品控制型式，然后获得相关的证书。
For the main pressure-bearing parts of equipment in categories II, III and IV, this must take the form of a certificate of specific product control.
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