ASTM C335/C335M-17
管道隔热稳态热传导性能的标准试验方法

Standard Test Method for Steady-State Heat Transfer Properties of Pipe Insulation

被代替

ASTM C335/C335M-17 发布历史

ASTM C335/C335M-17由美国材料与试验协会 US-ASTM 发布于 2017。

ASTM C335/C335M-17 在中国标准分类中归属于: P94 金属设备与工艺管道安装工程，在国际标准分类中归属于: 91.100.60 隔声和绝热材料。

ASTM C335/C335M-17 发布之时，引用了标准

• ASTM C1045 在稳态条件下计算热传递性能的标准规程
• ASTM C1058 评价和报告绝热材料热性能用温度的选择的标准实施规程
• ASTM C168 与隔热有关的标准术语
• ASTM C177 用护热板法测定稳态热通量和传导性的标准试验方法
• ASTM C302 预制包覆管道用隔热材料密度和尺寸的标准试验方法
• ASTM C518 用热流计法测定稳态热通量和热传递特性的标准试验方法
• ASTM C680 用计算机程序控制测定绝热管及设备系统的表面温度和吸热或热损失的规程
• ASTM C870 热绝缘材料的调整的标准实施规程
• ASTM E230 标准化热电偶用温度电动势(EMF)图表的标准规范
• ISO 8497 绝热 圆管保温层的稳态传热性质的测定

ASTM C335/C335M-17的历代版本如下：

• 2023年 ASTM C335/C335M-23 管道绝热材料的稳态传热财产的标准试验方法
• 2017年 ASTM C335/C335M-17 管道隔热稳态热传导性能的标准试验方法
• 2010年 ASTM C335/C335M-10e1 管道隔热稳态热传导性能的标准试验方法
• 2010年 ASTM C335/C335M-10 管道隔热稳态热传导性能的标准试验方法
• 2005年 ASTM C335-05ae1 管绝缘材料稳态传热特性的标准试验方法
• 2005年 ASTM C335-05a 管道绝缘的稳态传热特性的标准试验方法
• 2005年 ASTM C335-05 管道绝缘的稳态传热特性的标准试验方法
• 2003年 ASTM C335-03a 水平管绝缘稳态传热特性的标准试验方法
• 1995年 ASTM C335-95 卧式隔热管稳定传热特性的标准试验方法

4.1 As determined by this test method, the pipe insulation lineal thermal resistance or conductance (and, when applicable, the thermal resistivity or conductivity) are means of comparing insulations which include the effects of the insulation and its fit upon the pipe, circumferential and longitudinal jointing, and variations in construction, but do not include the effects of the outer surface resistance or heat transfer coefficient. They are thus appropriate when the insulation outer-surface temperature and the pipe temperature are known or specified. However, since the thermal properties determined by this test method include the effects of fit and jointing, they are not true material properties. Therefore, properties determined by this test method are somewhat different from those obtained on apparently similar material in flat form using the guarded hot plate, Test Method C177, or the heat flow meter apparatus, Test Method C518.

4.2 The pipe insulation lineal thermal transference incorporates both the effect of the insulation and its fit upon the pipe and also the effect of the surface heat-transfer coefficient. It is appropriate when the ambient conditions and the pipe temperature are known or specified and the thermal effects of the surface are to be included.

4.3 Because of the test condition requirements prescribed in this test method, recognize that the thermal transfer properties obtained will not necessarily be the value pertaining under all service conditions. As an example, this test method provides that the thermal properties shall be obtained by tests on dry or conditioned specimens, while such conditions are not necessarily realized in service. The results obtained are strictly applicable only for the conditions of test and for the product construction tested, and must not be applied without proper adjustment when the material is used at other conditions, such as mean temperatures that differ appreciably from those of the test. With these qualifications in mind, the following apply:

4.3.1 For horizontal or vertical pipes of the same size and temperature, operating in the same ambient environment, values obtained by this test method can be used for the direct comparison of several specimens, for comparison to specification values, and for engineering data for estimating heat loss of actual applications of specimens identical to those tested (including any jackets or surface treatments). When appropriate, correct for the effect of end joints and other recurring irregularities (4.4).

4.3.2 When applying the results to insulation sizes different from those used in the test, an appropriate mathematical analysis is required. For homogeneous materials, this consists of the use of the thermal conductivity or resistivity values (corrected for any changes in mean temperature) plus the use of the surface heat transfer coefficient when the ambient temperature is considered (for example, see Practice C680). For nonhomogeneous and reflective insulation materials, a more detailed mathematical model is required which properly accounts for the individual modes of heat transfer (conduction, convection, radiation) and the variation of each mode with changing pipe size, insulation thickness, and temperature.

标准号

ASTM C335/C335M-17

发布

2017年

发布单位

美国材料与试验协会

替代标准

ASTM C335/C335M-23

当前最新

ASTM C335/C335M-23

 

 

引用标准

ASTM C1045 ASTM C1058 ASTM C168 ASTM C177 ASTM C302 ASTM C518 ASTM C680 ASTM C870 ASTM E230 ISO 8497

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