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| [#21] 請教大廈供水問題 If suction tank is fitted, it cannot provide sufficient head for the pumps' NPSH, hence cavitation. Even worse. Direct feed and booster pump is more simple. The tank is in fact WSD service reservoir with residual pressure of say 2 bar. Only guarantee on fresh water but not salt water. Only sprinkler tank at grid level is required (if sprinkler fitted say for garage) to fulfill FSD's requirement for a few hours utilisation and for safety reasons 最後修改時間: 2024-02-09 07:54:08 |
alexanderkoo 223.xxx.xxx.199 |
2024-02-09 07:52 | |
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| [#22] 請教大廈供水問題 非常感謝各位師兄的指教,令小弟長知識了,獲益良多:) |
天富仔 14.xxx.xxx.77 |
2024-02-09 09:16 |
| [#23] 請教大廈供水問題 I worked on HV pumpsets of 2.5MW (not kW) and up to 11 kV. Such voltage can ignite a person. Fortunately, I am still alive. The building pumpset is smaller than village supply pumphouse, say 11kW, 380V. Besides 1 bar=10m water. If you want to have static head of 2 bar. You have to build a tank of 20m high. So, direct feed from mains is easier. Residual head is small when pump running, inclusive of all frictional losses. Two different things. 最後修改時間: 2024-02-09 09:25:17 |
alexanderkoo 223.xxx.xxx.199 |
2024-02-09 09:20 |
| [#24] 請教大廈供水問題 本苑加地庫 大約層丶用地下壓力豉丶谷上樓層 1000 L each, 每座兩個丶法國名牌橙色丶行內一定知牌子丶智豐代理 ![]() |
phil.ng 223.xxx.xxx.167 |
2024-02-09 12:07 |
| [#25] 請教大廈供水問題 壓力制 set 8 bar ![]() |
phil.ng 223.xxx.xxx.167 |
2024-02-09 12:08 |
| [#26] 請教大廈供水問題 Vertical pump 每座兩台 ![]() |
phil.ng 223.xxx.xxx.167 |
2024-02-09 12:09 |
| [#27] 請教大廈供水問題 三相7kw 變頻丶我指導下安装 保護 pump, 可set 由 O Hz 加速 到 max ,秒數丶可快可慢 ![]() |
phil.ng 223.xxx.xxx.167 |
2024-02-09 12:11 |
| [#28] 請教大廈供水問題 本苑有至少十部 變頻 控水池 四段高低丶慳電又有花樣 ![]() |
phil.ng 223.xxx.xxx.167 |
2024-02-09 14:56 |
| [#29] 請教大廈供水問題 4 Kw 比水池用 ![]() |
phil.ng 223.xxx.xxx.167 |
2024-02-09 14:57 |
| [#30] 請教大廈供水問題 車場抽風機丶4kw, 多車時行大風丶少車時行低 Hz, 全靠變頻 ![]() |
phil.ng 223.xxx.xxx.167 |
2024-02-09 15:00 |
| [#31] 請教大廈供水問題 車場風機丶變頻丶不同時段丶不同力度丶慳電! ![]() |
phil.ng 223.xxx.xxx.167 |
2024-02-09 15:02 |
| [#32] 請教大廈供水問題 380v 大匹數丶就算Y角起動都傷 泵丶變頻起動丶由 0Hz 上丶非常順 又有時 11kw 的會過大丶我地慢慢調低到所需多少少丶又慳電丶又長壽! |
phil.ng 223.xxx.xxx.167 |
2024-02-09 15:32 |