Solusi Perlindungan Lonjakan Lanjutan untuk Proyek Restorasi Ekologis Tiga Danau, Tiongkok
Pekerjaan Air
2025
Cina
Protecting Yunnan’s Freshwater Lakes
Located in the heart of Yunnan Province in southwestern China, the city of Yuxi is an industrial and ecological hub surrounded by three vital freshwater lakes: u003cstrongu003eFuxian, Xingyun, and Qilu.u003c/strongu003ernrnIn recent years, these lakes have suffered from declining water levels and increasing pollution, threatening both the environment and the communities that rely on them.rnrnTo address this, the Yuxi East Area Bulk Water Supply Project, a.k.a. the u0022Three Lakes Projectu0022, was established with a total investment of 1.89 billion Yuan (u003cspan data-issueid=u0022f68e941f-f906-40a4-be9c-a5aaa0724908u0022 aria-label=u0022open issue for the following text approx.u0022 data-testid=u0022issue-underline:Approx.u0022 data-pm-slice=u00220 0 []u0022u003eapprox.u003c/spanu003e US$263 million). The project aimed to deliver clean spring water from Dalongtan Spring to ecologically improve the lakes’ water and ensure water supply for rural areas, as well as irrigation needs and industrial development of over 1.5 million residents across five administrative districts. In doing so, the project fosters environmental sustainability and contributes to the preservation of natural ecosystems in the region.
Managing Extreme Elevation and Surge Risk
The project required lifting water across a 941-meter elevation from the Dalongtan spring to uphill reservoir. In order to achieve this, a series of three pump stations were designed and built. Each pumping station composed of six parallel high-capacity pumps (four of which active at a time), delivering water through 1,200 mm metal pipeline over a total distance of more than 6.5 kilometers.
The table contains the main technical info about the system:rnu003cdiv style=u0022width: 100%;max-width: 100%u0022u003ernu003ctable style=u0022width: 100%;border-collapse: collapse;color: #000;font-size: 15px;line-height: 1.25;text-align: centeru0022 border=u00221u0022 cellspacing=u00220u0022 cellpadding=u00220u0022u003ernu003ctbodyu003ernu003ctru003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;text-align: left;width: 40%u0022u003eu003cstrongu003eSystem Parameteru003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;width: 20%u0022u003eu003cstrongu003e1u003csupu003estu003c/supu003ernPump Stationu003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;width: 20%u0022u003eu003cstrongu003e2u003csupu003endu003c/supu003ernPump Stationu003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;width: 20%u0022u003eu003cstrongu003e3u003csupu003erdu003c/supu003ernPump Stationu003c/strongu003eu003c/tdu003ernu003c/tru003ernu003ctru003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;text-align: leftu0022u003eu003cstrongu003eNumber of Pumpsu003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022 colspan=u00223u0022u003e6 (4 Active + 2 Standby)u003c/tdu003ernu003c/tru003ernu003ctru003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;text-align: leftu0022u003eu003cstrongu003eSingle Pump Flowrate (mu003csupu003e3u003c/supu003e/h)u003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022 colspan=u00223u0022u003e2250u003c/tdu003ernu003c/tru003ernu003ctru003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;text-align: leftu0022u003eu003cstrongu003eTotal Flowrate (mu003csupu003e3u003c/supu003e/h)u003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022 colspan=u00223u0022u003e9000u003c/tdu003ernu003c/tru003ernu003ctru003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;text-align: leftu0022u003eu003cstrongu003ePump Head (m)u003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022u003e237u003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022u003e356u003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022u003e356u003c/tdu003ernu003c/tru003ernu003ctru003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;text-align: leftu0022u003eu003cstrongu003eMainline Pipe Diameter (mm)u003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022 colspan=u00223u0022u003e1200u003c/tdu003ernu003c/tru003ernu003ctru003ernu003ctd style=u0022border: 1px solid #000;padding: 6px;text-align: leftu0022u003eu003cstrongu003eMainline Length (m)u003c/strongu003eu003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022u003e1415u003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022u003e2663u003c/tdu003ernu003ctd style=u0022border: 1px solid #000;padding: 6pxu0022u003e1957u003c/tdu003ernu003c/tru003ernu003c/tbodyu003ernu003c/tableu003ernu003c/divu003ernu003cp style=u0022text-align: leftu0022u003eSuch a system, while powerful, is highly vulnerable to hydraulic transients, especially during u003cstrongu003epower failures or emergency pump shutdowns, when fluid in motion is forced to stop or change direction suddenly.u003c/strongu003e These events can trigger dangerous pressure surges, risking damage to pumps, pipelines, valves, and other system components, as well as risk for burst, flood and loss of human life. Therefore, surge protection solutions must be implemented after conducting comprehensive surge analysis.u003c/pu003e
Surge Analysis and Simulation
A detailed u003cstrongu003esurge analysisu003c/strongu003e was conducted by BERMAD experts. Using KY Pipe software, the simulation modeled worst-case scenario, including uncontrolled pumps trip.rnrnThe surge analysis showed:rnu003culu003ern tu003cliu003eu003cstrongu003eResults without protection:u003c/strongu003e both negative u0026amp; positive pressure surge occurs in all three pumping stations and along each discharge pipeline in a scenario of all pumps trip due to power failure.u003c/liu003ern tu003cliu003eu003cstrongu003eResults with surge protection solution:u003c/strongu003e by implementing BERMAD’s surge protection solutions the surge phenomena is mitigated so the pressure profile present a controlled transient scenario and safe operation across all pumping stations and along each discharge pipeline.u003c/liu003ernu003c/ulu003e
The graph illustrates the pressure behavior (head in meters vs. time in sec) in one of the 3 pumping stations during power failure:rnu003culu003ern tu003cliu003eThe red line presents the pressure behavior during power failure without any surge protection solution being implemented. The significant pressure surge is clearly presented.u003c/liu003ern tu003cliu003eThe green line presents the pressure behavior during power failure with BERMAD’s surge protection solution implemented.u003c/liu003ernu003c/ulu003ernThe analysis confirmed that the selected solution of surge anticipating valves u0026amp; combination air valves effectively mitigate the surge phenomena u0026amp; surge risks, ensuring u003cstrongu003elong-term reliabilityu003c/strongu003e and u003cstrongu003esystem resilienceu003c/strongu003e.
Surge Anticipating Valves u0026amp; Combination Air Valve Integration
Surge protection solution includes u003cstrongu003esurge anticipating valves u0026amp; combination air valvesu003c/strongu003e with surge protection feature.rnrnu003cstrongu003e1. Surge Anticipating Valvesu003c/strongu003e Each pump station was equipped with three hydraulically operated, piston actuated off‑line surge anticipating valves for high pressure (PN40). These valves, sensing main line pressure, open in response to the pressure drop associated with abrupt pump stoppage. The pre-opened valves dissipate the returning high pressure wave, eliminating the surge.rnu003culu003ern tu003cliu003ePump Station #1u003cstrongu003e: u003c/strongu003e3 units ofu003cstrongu003e u003ca href=u0022https://www.bermad.com/product/model-835-m/u0022 target=u0022_blanku0022 rel=u0022noopeneru0022u003eWW-12”-835-Mu003c/au003eu003c/strongu003eu003c/liu003ern tu003cliu003ePump Stations #2: 3 units of u003cstrongu003eWW-16”-835-Mu003c/strongu003eu003c/liu003ern tu003cli data-wt-guid=u0022cda676ad-5f41-4334-8ba8-8a0aceb2fdc8u0022u003ePump Stations #3: 3 units of u003cstrongu003eWW-16u0022-835-Mu003c/strongu003eu003c/liu003ernu003c/ulu003ernu003cstrongu003e2. Combination Air Valves u003c/strongu003eStrategically placed along the pipeline and within the pump stations, these valves u003cstrongu003erelease trapped airu003c/strongu003e during startup and u003cstrongu003eadmit airu003c/strongu003e during shutdowns, preventing vacuum conditions and water column separation.rnrnUsing BERMAD Air software u0026amp; the surge analysis software, BERMAD’s experts allocated and sized the required air valves in the pumping station and along the main line. The air valves are a crucial part of the complete surge protection solution allowing sufficient air intake into the main pipeline, preventing vacuum conditions and pipe collapse, mitigating the negative pressure surge during pumps trip, as well as cushioning the positive surge allowing restrained air release when the wave returns towards the pumping stations. The air valves are installed at each of the pumping stations, at high points and at critical points along the mainline, u003cstrongu003ebased on the surge analysis u0026amp; BERMAD Air software.u003c/strongu003ernrnBased on the analysis BERMAD recommended to install combination air valves as follows: per each pumping station, model u003ca href=u0022https://www.bermad.com/product/c70-2/u0022 target=u0022_blanku0022 rel=u0022noopeneru0022u003eWW-C70-ACu003c/au003e (4”)u003cstrongu003e u003c/strongu003eon each pump discharge line and on each rising main model WW-C70-SP (6u0022). The customer accepted most of BERMAD air valves recommendations.rnrnu003cimg class=u0022aligncenter wp-image-262063 size-largeu0022 src=u0022https://www.bermad.com/wp-content/uploads/2025/10/inblog-piplines-3-images2-1024×499.jpgu0022 alt=u0022u0022 width=u00221024u0022 height=u0022499u0022 /u003e
WHY BERMAD
The 3 lakes ecological restoration project is a perfect example of how BERMAD’s advancedu003cstrongu003e, u003c/strongu003esmart and efficient hydraulic control solutions aim to protect critical water systems infrastructure, even in challenging topography. By ensuring system stability and reliability, the project not only secures water delivery but also supports the ecological restoration u0026amp; sustainability of Yunnan’s iconic lakes.rnrnThis case study serves as a valuable reference for similar bulk water supply systems worldwide, where u003cstrongu003eelevation, distance and other environmental local issuesu003c/strongu003e raise the need for efficient, sustainable, and robust solutions as BERMAD designed u0026amp; implemented in this outstanding project.
