The main difference between U and UM is that UM vessels are smaller in volume than U vessels, even though both size vessels can have similar operating pressures. Some categories for UM stamped pressure vessels as listed in the ASME BPVC U-1j subset, include:

Here are the main differences between ASME U and ASME UM symbols and certification. Any vessel meeting the requirement of ASME Section VIII can be marked with the U Symbol. Most local and state laws require vessel designs 15 PSI and higher to be ASME Code Certified.

The UM Stamp is a special endorsement that allows manufacturers to design and fabricate pressure vessels using their own design code or standard, provided it is equivalent to or more stringent than ASME Section VIII, Division 1.

The ASME U stamp is used for larger pressure vessels that do not have any size limitations, while the ASME UM stamp is designated for smaller vessels, typically with a volume of 5 cubic feet (0.14 cubic meters) or less and a maximum allowable working pressure of 250 psi.

Based on ASME's Section 8, Division 1, there are distinct designations for pressure vessel which indicate that larger vessels should receive the U stamp while smaller or miniature vessels receive the UM stamp. The main difference between the ASME U-stamp vessel and the UM-stamp vessel manufacturing companies, however, goes beyond the size, even ...

首先ASME是美国关于压力容器，锅炉，管道，承压系统的族标准，生产ASME钢印产品，首先工厂要通过ASME认证，工厂取得相应的认证就会取得相应的钢印，储罐一般是按八一卷设计制造的，一般取得的是U钢印，对于出口美国和新加坡，澳大利亚等一些认可ASME产品的国家，由直属的AI建造并被认可，可打钢印，产品便可出口到上述国家。 产品通过ASME认证并不一定能打钢印，准确的说企业没有ASME资质产品是不可能通过ASME认证的，你所说的储气罐的通 …

2022年8月22日 · U Stamp. The U stamp certifies that a manufacturer meets the quality control system requirements laid out in the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC). Manufacturers with this stamp are permitted to design, fabricate, inspect, and test unfired pressure vessels.

Manufacturers with the {U} or {U2} ASME stamp are permitted to design, fabricate, inspect, and test unfired pressure vessels. Manufacturers with the {S} ASME stamp are permitted to fabricate piping systems – pressure retaining parts, power boilers, and power piping.

任何符合asme代码部分viii的要求的坦克都可以获得认证。该认证经常被称为“盖章”，因为代码符号最常使用邮票过程应用。以下是asme u和asme um符号和认证之间的主要差异。 带有u符号的asme认证. 任何满足asme第viii的要求的船只都可以用u符号标记。

Certification of a manufacturer's or assembler's quality control system in accordance with ASME Boiler and Pressure Vessel Code (BPVC) Sections I, IV, VIII, X, and/or XII. Start an application or check your application status online using CA Connect. Already started? Go to CA Connect.