2020年5月7日 · We will start with UG-20(f) for the ASME impact test requirement. If your MOC (Material of Construction) is categorized in P-No. 1 or 2 (Refer to ASME Code Section IX for P-No Definition) and your MOC thickness has the limited value defined in this clause, then you might be exempted from impact testing.

Unless exempted in UG-20(f), Fig. UCS-66 shall be used to establish impact testing exemptions for steel listed in part UCS. Impact testing is checked for the combination of minimum design metal temperature and governing thickness of the part.

2024年11月14日 · Paragraph UG-20(f) of the ASME Boiler and Pressure Vessel Code (BPVC), Section VIII, Division 1 provides guidance on applicable impact test exemptions for design temperatures no colder than −20 °F (−29 °C) under certain conditions (e.g. material/thickness combinations; hydrostatically tested; no shock loadings).

2020年11月9日 · UG-20(f): Impact test per UG-84 is not mandatory for pressure vessel material that satisfy all of the followings: 1. Material is limited to P-NO.1, Gr. NO.1 or 2 and thickness don’t exceeds the...

GB150.1-2011规定：设计温度低于-20℃的碳素钢、低合金钢、双相不锈钢和铁素体不锈钢制容器为低温容器 [1]。 低温容器用材料必须做夏比V型缺口冲击试验，其试验温度不高于设计温度，冲击功应满足该温度下标准要求的数值，此时冲击试验唯一豁免的条件是：容器处于“低温低应力工况”，具体“低温低应力”概念详见GB150.3-2011附录E规定，不过“低温低应力工况”不适用于钢材标准抗拉强度下限值R m ≥540MPa的材料以及螺栓材料。 对于设计温度在-20℃～0℃范围内的容 …

ug-20（b）最低金属设计壁温（mdmt）-容器运行过程中的最低温度。 MDMT –必须与相应的MAWP一起标在容器的铭牌上。 冲击试验法则的主要特点是，使用一组冲击试验免除曲线，该曲线按MDMT对应于元件的厚度将常用的钢材分成了四个组。

2001年4月19日 · Question: May pressure vessel materials be exempted from impact testing if all of the requirements of UG-20(f) in Section VIII, Division 1 are met, even though impact testing would be required under the provisions of Fig. UCS-66?

Structure of paragraph UG-20. The objective of the present work is to teach the criteria proposed by the ASME VIII code division 1 to determine when an impact test should be carried out on a base...

2008年2月14日 · If you are operating a vessel that was designed by the rules of UG-20(f) and your vessel's operating temperature goes below -20 deg F as a result of that three weeks of cold weather, then you need to make some process adjustments to bring up that operating temperature to where it should be in the shortest possible time.

The design temperature range is between -20°F and 650°F, with occasional operation below -20°F permitted due to lower seasonal temperatures. The material thickness shall not exceed 1/2 inch for materials in Curve A or 1 inch for materials in Curves B, C, or D of Figure UCS-66.