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| [#21] 家居大奘修 Riser to rooftop? This I cannot tell without actual configuration. Copper tube/iron pipe/cast iron lives 25/15/50 years. May extend the service period but heavy corrosion and affecting water quality except for drainage ,even if no leakage. Iron pipe leaky at joints, almost a must due to no galvanisation(zinc) of pipe at the coupling hence corrosion ,thinner metal at threads. If attempted to loosen, it can break at the threads. Such application is for fire fighting sprinkler system. 最後修改時間: 2024-02-27 07:44:59 |
alexanderkoo 正式會員223.xxx.xxx.179 |
2024-02-27 07:42 | |
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