化學系各位成員大家好：

2024年8月27日上午，六樓618實驗室發生淹水，大量的水流經617再到616的管道間漏到下方樓層。

經與實驗室人員座談，事發經過整理如下： 

1. 該排煙櫃前晚在沒有進行實驗的情況下，沒有關閉水龍頭，且出水量相當大，實驗室最後離開之人員也並未發現此問題。
2. 在不確定之時間點，大量的水直接灌到地面，導致618地板積水，流經617再到616的管道間漏到下方樓層，造成下方所有樓層積水。

缺失及建議說明如下：

1. 漏水橡皮管起初有用束帶固定，但該橡皮管為抽真空使用的厚壁橡皮管，不適合做為回流裝置使用，以束帶固定並無束縛效果。
2. 事故現場照片顯示，地板上有使用中之延長線，而且所有插座皆朝上。此為應即刻改善之缺失，因為延長線應固定於垂直面，避免插座堆積灰塵或進水而導致短路或漏電等危險。在此次淹水事件中，有極大可能造成短路或人員觸電之危險，所幸本次事件並沒有造成人員傷害。
3. 人員習慣將水量開至最大而不知使用量，長時間冷凝建議使用循環水或將水量調降，可使用簡易流量計量測。

後續處理說明如下：

1. 由於同類事件已於該實驗室發生兩次，即日起該實驗室停止運作三天。三天後系上再檢查是否可以重新運作。
2. 目前系辦人員已初步處理地面積水，但是無法確認目前滲入大樓本體之積水是否已經完全排除，所以請發生淹水事件下方之實驗室、教室、儀器室、辦公室人員多加注意電器使用情況。
3. 由於此次事件純屬人為疏失，日後若有任何相關災損，將與該實驗室商討分攤維修之費用。

化學系環安衛小組

Dear all,

On the morning of August 27, 2024, the 618 laboratory on the sixth floor happened flooding. A huge amount of water flowed through the 617 and 616 pipe passages, leaking down to the lower floors.

After discussing the incident with laboratory personnel, the sequence of events is summarized as follows:

1. The hood’s faucet in this incident was left open all night despite no experiments being conducted, resulting in a significant flow of water. The last person left the lab did not notice this issue.
2. At an uncertain time, a large volume of water flooded the floor of 618, flowed through 617 and into 616, leaking down to the lower floors, causing water accumulation on all lower levels.

The deficiencies and recommendations are as follows:

1. The leaking rubber hose was initially secured with a zip tie, but since it is a thick-walled vacuum hose, it was not suitable as a reflux device. The zip tie did not effectively secure it.
2. Photos from the incident show that extension cords were in use on the floor, with all outlets facing upward. This is a serious deficiency that needs immediate improvement, as extension cords should be secured to vertical surfaces to prevent dust accumulation or water ingress that could lead to short circuits or electric shocks. While no injuries occurred this time, such conditions pose a significant risk.
3. Personnel are accustomed to setting the water flow to maximum without considering usage amounts. It is recommended to use circulating water or reduce the water flow over long periods. A simple flow meter can be used to measure flow rate.

Follow-up actions are as follows:

1. Due to the recurrence of similar incidents in this laboratory, it will be suspended for three days starting today. The department will reassess whether it can be reopened after three days.
2. The department staff has initially addressed the water accumulation on the floor, but it cannot be confirmed if all water seepage into the building structure has been completely resolved. Therefore, laboratory, classroom, instrument room, and office personnel on the lower floors where the flooding occurred should be extra cautious about electrical usage.
3. As this incident was due to human error, any related repair or damaged costs in the future will be discussed and shared with the laboratory responsible.

EHS-CHEM Team