Selected field applications
Cold-applied corrosion protection systems on storage tanks, buried valves, industrial pipework and steel connections — extracted from company project records.
How to read these references. Zhuohuang supplies cold-applied wrapping materials and supports product selection, system configuration and field application guidance. Project conditions, surface preparation, system components and operating environments vary. Client names are translated from the Chinese originals. A reference demonstrates application experience; it does not replace project-specific technical review or the current product data sheets. Full project photographs and technical proposals can be supplied for qualified review where available.
Oiltanking — storage tank annular edge
- LocationQingdao, Shandong, China
- AssetStorage tank annular edge
- SystemPetrolatum tape system
- Reference date5 November 2021
Project challenge
The tank shell-to-foundation transition is exposed to rainwater, retained moisture and movement between full and empty operating conditions. Rigid coating details may crack or lose adhesion at this dynamic edge.
System configuration
- Petrolatum primer
- Elastic profiling mastic
- Petrolatum corrosion protection tape
- Metal protective outer wrap
- Outer-wrap primer and elastomeric finishing layer
Outcome. The system created a sealed, flexible transition from the lower tank shell to the concrete foundation edge. Following initial use, the solution was recognised for continued application through planned tank maintenance activities.
China Gas — buried valves and flanges
- LocationNanjing / Hangzhou / Yangzhong, China
- AssetBuried valves and flanges in valve chambers
- SystemPetrolatum primer + mastic + tape
- ReferenceIn use since 2018
Project challenge
Valve chambers accumulate rainwater or groundwater. Conventional paint films deteriorate when valves, flanges and fasteners remain wet or are periodically submerged, while complex shapes create difficult coating details.
System configuration
- Remove loose rust and contamination
- Apply petrolatum primer
- Profile recessed areas with mastic
- Wrap petrolatum tape with controlled overlap
- Smooth joints and eliminate voids
Outcome. The wrapping system has been used in China Gas valve chambers since 2018, supporting continued protection where valve assemblies are exposed to chamber water ingress and difficult maintenance access.
Nanjing Iron & Steel Group — pipe-rack utility lines
- LocationMetallurgical industry, China
- AssetUtility pipelines in pipe racks
- SystemPetrolatum wrapping system
- ReferenceProject reference published 2021
Project challenge
Pipe-rack utility lines operate continuously in a humid industrial atmosphere. Local paint breakdown, corrosion at fittings and restricted access make conventional recoating difficult and disruptive.
System configuration
- Manual surface preparation to remove loose corrosion
- Primer or paste where required
- Petrolatum tape wrapping
- Compatible protective outer layer selected for exposure and mechanical conditions
Outcome. The cold-applied method enabled local maintenance around pipeline surfaces and irregular details without hot work or lengthy curing.
Bolts, base plates and structural connections
- ClientIdentity not disclosed
- LocationIndustrial steel-structure maintenance
- SystemPaste + petrolatum tape + protective cover
Project challenge
Bolts, connection plates, welds and recesses create sharp changes in geometry and hidden crevices. Paint application is difficult to control and water can enter gaps between connected steel components.
System configuration
- Inspect and prepare the connection
- Apply corrosion protection paste to fill gaps
- Build smooth transitions around bolts
- Apply petrolatum tape
- Add a protective cover or finishing layer
Outcome. The system fully encapsulated the bolt and surrounding connection zone. Flexible paste and tape filled irregular spaces, while the outer protection provided a maintainable finish for the exposed steel detail.
Cold-applied storage tank edge projects
Storage tank annular plate and chime protection is the largest single application area. Capacities are nominal tank capacities as recorded in company project files.
| Client / project | Period | Tank capacity | Cold-applied system |
|---|---|---|---|
| Sinopec Zhanjiang Refining & Chemical | 2018–2020 | 100 000 m³ | Petrolatum tank-edge system |
| Sinopec Chongqing Branch | 2019 | 100 000 m³ | Petrolatum tank-edge system |
| Ningbo Dingshi Storage Co., Ltd. | 2021–2022 | 50 000 m³ | Petrolatum tank-edge system |
| Sinopec Tongxiang Oil Depot | 2020 | 50 000 m³ | Petrolatum tank-edge system |
| Daqing Pure Benzene Project | 2023 | 50 000 m³ | Petrolatum tank-edge system |
| Zhangjiagang Vopak Storage | 2019–2020 | 30 000 m³ | Petrolatum tank-edge system |
| Beifang Petroleum | 2017–2020 | 20 000 m³ | Petrolatum tank-edge system |
| Shanhaiguan Airport Fuel Depot | 2022 | 10 000 m³ | Petrolatum tank-edge system |
| Jiujiang Airport Fuel Depot | 2022 | 5 000 m³ | Petrolatum tank-edge system |
Company records also include tank-edge projects executed with an elastic coating system. That is a different technology and is not part of the cold-applied wrapping range described on this site, so those projects are not listed here. The separate list can be supplied on request.
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Full project photographs, technical proposals and customer-specific documents can be supplied for qualified review where available.