Sandblasting Underway at Baihuipu Qinzhou Chemical Project
Baihuipu's installation team is carrying out sandblasting and surface preparation on the large steel tanks of the Guangxi Huaqiao chemical wastewater project in Qinzhou, Guangxi, this week. The work covers external shells, internal walls and the steel access structures that will carry the treatment train. Abrasive blasting is being done from suspended baskets, scaffolds and mobile lifts before the anti-corrosion coating system is applied, because coating adhesion on a chemical wastewater tank is decided by the surface condition underneath it, not by the paint itself. The site is running to the client's construction calendar, with our fabrication, coating and safety supervisors working alongside the civil contractor.
Key Features and Benefits
Surface Preparation Before Coating
The tank shells arrive from our Guangdong works with mill scale and fabrication marks still on the steel. Blasting removes both and leaves an anchor profile that the primer can key into. On the Qinzhou units the contrast between the untreated orange steel and the prepared grey areas is visible panel by panel, which is how the crew tracks progress and makes sure no section is skipped.
Surface cleanliness and roughness are checked before coating starts, and the checks are recorded against each tank rather than signed off as one batch. The same documentation discipline runs through our fabrication quality records, where weld maps and material certificates are compiled during fabrication instead of assembled at handover.
On chemical wastewater duties the coating has to cope with fluctuating pH, salts and occasional solvent exposure. Getting the preparation right is cheaper than recoating a tank after the plant is in service.
Working at Height and Inside Tanks
Most of the blasting here is not done from the ground. Crews work from suspended baskets, scaffold platforms and the permanent steel stairs being installed on the tanks. Lift plans, harness points and rescue arrangements are agreed before each shift, and the work area below is barricaded while a basket is in the air.
Internal blasting adds confined-space controls: atmosphere testing, forced ventilation, standby attendants and dust extraction. The image from inside the tank shows the visibility the crew actually works in, which is why lighting and extraction are part of the method statement rather than optional extras.
Coordination on a Live Chemical Site
Concrete basins, steel platforms, a mobile crane and tank erection are all progressing in the same footprint. Sequencing matters more than speed: the crane lift, the blasting crew and the coating crew cannot occupy the same bay at the same time. Daily coordination with the client's site team sets which face is handed over and when.
That coordination is the same discipline we apply on EPC wastewater plant delivery, where process design, fabrication, civil works and commissioning sit under one contract and one schedule. It also ties back to the evaporation and crystallization fabrication that produced these vessels, since delivery slots and site readiness have to match.
Technical Specifications
The table below sets out the typical surface preparation and coating basis we work to on chemical wastewater tanks. Project-specific values are fixed in the method statement after the client approves the coating system.
| Item | As-Fabricated Steel | After Blasting and Coating |
|---|---|---|
| Surface condition | mill scale, weld spatter, fabrication marks | cleaned to the specified blast grade |
| Anchor profile | none | set by the approved coating system |
| Coating build | bare steel | primer plus finish coats to specified DFT |
| Inspection record | fabrication check only | per-tank surface and DFT records |
| Access provision | temporary scaffolds | permanent stairs, platforms, baskets |
Values are design targets for this class of duty, not site-measured performance figures.
Customer FAQs
Why sandblast a wastewater tank before coating?
Blasting removes mill scale and leaves a rough, clean profile that the primer can bond to. Coating applied over unprepared steel tends to lift within a few years, especially where the tank sees salts, solvents or pH swings.
How is work at height managed on site?
Lift plans, certified anchor points, harnesses and a rescue arrangement are agreed before each shift, and the area below the basket is barricaded. Permanent stairs and platforms are installed as the tank erection progresses.
What controls apply to blasting inside a tank?
Confined-space procedures: atmosphere testing, forced ventilation, dust extraction, standby attendants and task lighting. Internal work is scheduled separately from external blasting to keep escape routes clear.
Does surface preparation affect the project schedule?
It sits on the critical path between fabrication and coating, so delivery slots and site readiness are planned together. Weather windows matter too, since blasting and coating cannot run on a wet surface.
Readers comparing project execution approaches often also look at the chemical wastewater plant project case and the remote monitoring platform for the commissioning and service stages that follow installation.
Why Choose Baihuipu as Your Manufacturer
Two decades in this industry teaches you that most treatment problems are procurement problems in disguise. Someone bought the cheapest skid, nobody checked the equalisation volume, and eighteen months on the plant cannot hold its consent limit. We build differently.
Own Factory, Real Capacity
Tanks, skids, control panels and membrane housings are built in our own Guangdong facility. Nothing critical is subcontracted, which is why we can commit to delivery dates and hold quality across a batch instead of hoping the shop floor gets it right.
Certification and Export Practice
CE marking is standard and we work to ISO 9001 procedures. Where a project calls for specific material grades, pressure vessel certification or ATEX-rated equipment, we build to that standard and ship the full documentation pack.
Experience Built the Hard Way
Since the early 2000s we have commissioned plants for food and beverage processors, chemical works, electroplaters, textile mills, mines and municipalities. The lessons that stick are scaling, fouling and sludge handling — those inform every design we issue.
We Engineer the Whole Train
Screening, equalisation, biological or chemical treatment, membranes, evaporation, brine handling — the complete line comes from one organisation. Process design, mechanical, electrical and PLC programming sit under the same roof, so there is no gap for finger-pointing at handover.
Twenty-Plus Export Markets
We have shipped to the United States, Canada, Russia, Indonesia, India, Nigeria and Vietnam among others. Crating, export documentation and certificates are handled in-house, which keeps customs surprises to a minimum.
Spares, Service and Commissioning
Membranes, dosing pumps, diffusers, instrumentation and blowers are stocked for the systems we sell. Our control systems support remote diagnostics, and we can put an engineer on site for commissioning, training or an unplanned shutdown.
Talk to Our Engineers
Send through your raw water data and we will advise on the viable process route and realistic operating cost before you commit to anything. We can be reached on WhatsApp: +86 13631765076 or through hkbhp.com.
WhatsApp: +86 13631765076
