NFPA 50 大容量氧气系统现场应用标准
日期:2012-02-09 16:44
in this standard at the time the standard was issued.
Unless otherwise specified, the provisions of this standard shall not apply to facilities, equipment, structures, or installations that existed or were approved for construction or installation prior to the effective date of the standard. Where specified, the provisions of this standard shall be retroactive.
In those cases where the authority having jurisdiction determines that the existing situation presents an unacceptable degree of risk,
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