against each other.
12
挠角试验
Flexibility Test for
Flexible Fittings
把管子加压到额定工作压力,对连接部位十加弯矩,直到弯曲到生产商指定的{zd0}挠度,规格小于
8英寸的不小于
1
度,
8英寸和
8英寸以上的不小于
0.5度,不应出现渗漏和管子损坏。
With the assembly pressurized to its rated pressure, a bending moment is to be applied to deflect the joint to the
maximum angle specified by the manufacturer, while not less than 1 degree for nominal pipe diameters less than 8
inches (203.2 mm) or 0.5 degrees for 8 inches (203.2 mm) and larger. Observations are to be made for leakage or
pipe damage.
13
抗震动试验
Seismic
Evaluation
为了估测在易于发生地震活动的区域
50-500年沟槽管卡的使用情况,测试装配组件要采用挠性管卡和长度较短的钢
管,尺寸相同,要能够经受住循环测试。测试将前后方向偏转装配组件到生产者被推荐的{zd0}角度
15个来回,内部
压力同额定工作压力相同。测试结果不应有渗漏、裂缝现象。
In order to evaluate the use of grooved couplings in Earthquake zones 50 through 500 years, test assemblies
utilizing flexible couplings and short lengths of steel pipe, in the same nominal size, will be subjected to cyclic
testing. The test will deflect the assembly to the manufacturer’s maximum recommended angle in the forward and
reverse direction for a total 15 cycles with the internal pressure equal to the rated working pressure. There shall be
no leakage, cracking, or rupture as a result of this test.
14测向位移
Lateral
Displacement
在任何测试阶段管卡都不能渗漏,并且要保持在生产商标定的管道系统的角偏移或测向位移范围内。
The coupling shall not leak during any of the tests, within the manufacturer’s stated limitations for angular
deflection or lateral displacement of associated pipework.
15
静水压波动测
试
Hydrostatic
fluctuation
pressure test
管卡装配系统须增压至水压
10巴
±
1巴,持续
2分钟
+30秒/-0秒,至此建立一组数据。然后将水排出,内部抽成真
空,达到{zd0}值
600mm a/水银柱或者
–0.8巴+0巴/-0.1巴,持续
2分钟
+30秒/-0秒。然后内部在不少于
5秒钟内返至大
气压。然后再增压至水压
10巴
±
1巴,持续
2分钟
+30秒/-0秒。测试过程中须检查整个装配系统是否有渗漏现象。每
根管子的相对移动在真空阶段及每个压力阶段都要被记录下来。不能有任何渗漏。
The coupling assembly shall be pressurised with water to a gauge pressure of
10 bar ±1 bar for 2min, +30s/-0s to establish a datum. The assembly shall then
be drained before being subjected to the greatest vacuum attainable to a
maximum of 600mm a/mercury or –0.8bar +0bar/-0.1 bar for 2min +30s/-0s,
and allowed to return to atmospheric pressure in not less than 5s. The assembly shall then be pressurised with
water to 10 bar ±1bar for 2 min +30s/-0s. The assembly shall be examined for leakage throughout the test. The
relative movement of each pipe shall be recorded at the greatest vacuum and at each pressure. There shall be no
leakage.
16防火测试
Fire Test
如果带橡胶圈的管件使用黑色金属的材质作为坚实的组成结构,或者依
FM认证判断,设计在防火方面受到怀疑,就
需要执行防火测试。没有橡胶圈的代表性尺寸的组装接缝应该被暴露在
1000°F(538°C)的环境中
5分钟。在这段
持续时间内,装配组件应该很干燥。暴露完毕后,立即引入水流到接缝处并持续到装配组件冷却至可以用手触摸。
不应有裂缝,任何管卡和管件的组成部分也不能有变形。然后管卡和管件要被拆开并装上橡胶圈。重新组装后,要
对接缝进行静水压测试。
If a gasketed pipe coupling or fitting employs non-ferrous materials for its substantial structural components, or if
in the judgment of FM Approvals, the design is otherwise suspect with respect to fire resistance, a fire test shall
be conducted. A representative size assembled joint without a gasket shall be exposed to a 1000 °F (538 °C)
fire environment for 5 minutes. The assembly shall be dry for the duration of this exposure. Immediately after the
exposure, a water flow shall be introduced through the joint and sustained until the assembly is cool to the touch.
No cracking or distortion of any component of the coupling or fitting shall occur. The coupling or fitting shall then be
disassembled and the gasket installed. After reassembly, the joint shall be hydrostatically tested, as described in to
the hydrostatic test.