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某年某月某日，某化工厂聚氯乙烯车间聚合工段因氯乙烯单体外泄，发生空间爆炸。死亡12人，重伤2人，轻伤3人。现场勘查发现：3#聚合釜2个冷却水阀门均处于关闭状态（据了解，该车间有这类“习惯性”操作）。虽然当时3#釜已经反应了8个小时，处于聚合反应的中后期（该厂聚合反应一般为11小时），但反应还是处于较激烈阶段，关闭冷却水阀门必然使大量反应热不能及时导出，造成釜内超温超压，由于聚合釜人垫未按照设计图纸的要求选用，所以人垫被冲开，使大量氯乙烯单体外泄，引发爆炸。同时发现聚合釜防爆片下的阀门全部关死。 根据案例完全下列问题： 在压力容器及压力管道构成的密闭系统中，试列举容器或管道破裂导致物料泄漏的常见原因。
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