Glass Fused to Steel Tank for Global Pig Farm Wastewater Treatment Project
Created on 02.24
Glass Fused to Steel Tank for Global Pig Farm Wastewater Treatment Project
A glass fused to steel tank for a global pig farm wastewater treatment project stores manure, digestate and process water in a surface that does not corrode, does not scale and can be washed down between batches. The enamel layer is fused to steel at 820–930 °C, holds pH 1–14, sits below 0.8 µm Ra and is rated for thirty years or more. For farms the deciding factors are usually ammonia-loaded odour, periodic emptying on the cropping calendar, and the ability to add tanks without a welding contractor on site.
The liquid handling side of a pig farm is governed by the barn calendar, not the process plant calendar. Slurry is flushed several times a day, stored for months and then spread or treated in a window set by the growing season, which means a storage volume designed only for average daily flow will overflow and a tank designed only for the emptying day will cost far more than needed. On top of that, the stream is ammonia-rich, septic between empties, and sometimes alkaline from the cleaning agents in the barn lanes. The shell material is decided long before the spans are detailed. What that decision produces is glass fused to steel tank for global pig farm wastewater treatment project, an inert, washable and extendable body that can be sited on a ring beam in less time than a concrete pour needs to cure. Ordering glass fused to steel tank for global pig farm wastewater treatment project against the emptying calendar rather than the daily flush rate is what keeps the farm inside its spreading window.
What Pig Effluent Actually Does to a Tank
Enamel thickness and fusion temperature set the failure boundary. A glass fused to steel tank carries a vitreous layer fired onto the steel panel at 820–930 °C, so the glass and the steel move as one body and there is no adhesive layer to saturate and lift when a septic load sits for weeks. The enamel is rated above 3450 N/cm², which absorbs the impact from loading equipment, gate hardware and maintenance work that a farm generates daily, and it stays inert across pH 1–14, covering both the ammonia-loaded manure stream and the alkaline lane-cleaning flush. The two failure modes to plan against are pinhole formation from sustained localised chemical attack and edge chipping on factory-cut panels, which is why the 1500 V DC spark test is run on every panel before it ships and why panel edges are finished at the factory rather than trimmed on site.
Sizing From the Barn Calendar, Not the Average Flow
Volume follows the emptying window, and the emptying window follows the cropping calendar. A pig farm normally stores liquid for a set number of days between applications or between treatment batches, so the required volume is the daily production figure multiplied by the storage interval, plus freeboard for the foam and scum layer that a high-solids stream always builds. Because the bolted shell is assembled from panels roughly 1.2 m wide, the diameter and height follow directly from that calculation, and the same panel system permits a second tank when the herd grows instead of a concrete rebuild. The tank is atmospheric by design, so the roof is a cover for wind and snow load and the vent is sized for vapour displacement and any gas generated by the stored stream, with the vent path decided by the odour control strategy rather than left to site practice.
Odour, Venting and the Ammonium Load
Odour control is a ventilation and cover decision taken early. Manure held warm and septic produces ammonia and odour that neighbours and the local authority register first register long before a process engineer does. A smooth enamel wall below 0.8 µm Ra reduces the biofilm and scale layer where odour-forming bacteria sit, and the roof with a properly sized vent lets the farm route the headspace to a biofilter or an acid scrubber instead of discharging at the tank. Mixing matters as much as covering: a slow-speed mixer prevents the solids and scum layer from crusting over the outlet and keeps the stream homogeneous when it is pumped out, so the nozzle and mixer position belong in the tank layout rather than being added later by the barn contractor.
Technical Specification
Parameter | Typical Value / Range | Note |
Enamel fusion temperature | 820–930 °C | single firing, glass bonded to steel |
Enamel layer thickness | 0.25–0.45 mm | measured per production panel |
Enamel strength | ≥ 3450 N/cm² | bending and compression rating |
Holiday detection | 1500 V DC spark test | factory release check per panel |
Surface finish | Ra < 0.8 µm | washable, low biofilm anchor |
Design life | ≥ 30 years | within the specified storage conditions |
pH resistance | 1–14 | manure stream through alkaline lane flush |
Joint | 8.8-grade bolts, EPDM gasket | reusable, torque checked at assembly |
Applying the Tank Across the Farm Layout
Where each tank sits in the farm train is where the value appears. The flush and collection tank needs volume and an outlet that will not block on settled solids; the equalisation or anaerobic feed tank needs mixing and a cover with a gas route where a digester follows; the digestate or treated effluent holding tank needs a long storage interval and a cleanable wall, since it is emptied on the spreading calendar. On multi-site farms the pattern that works well is a set of cylindrical enamel tanks on a shared ring beam, installed after the anchors are grouted and commissioned inside the normal works break. If the later treatment includes an anaerobic stage, the mesophilic temperature window and the gas pressure boundary belong to the digester scope and its cover system, and the storage tank specification stays atmospheric throughout.
Project Case
Project | Location | Product | Capacity | Scope |
Industrial wastewater series | Xinjiang, China | GFS tank | 30,469 m³ in 27 tanks | supply + installation supervision |
Breeding wastewater series | Yunnan, China | GFS tank | 11,603 m³ in 7 tanks | supply + commissioning support |
Municipal wastewater series | Sichuan, China | GFS tank | 17,420 m³ in 10 tanks | supply + installation supervision |
Aquaculture water series | Shandong, China | GFS tank | φ10.7 m × 2.4 m | supply + erection assistance |
Center Enamel Engineering Capability
Center Enamel (Shijiazhuang Zhengzhong Technology Co., Ltd) has designed and fabricated bolted storage tanks since 2008. As the first glass-fused-to-steel (GFS) tank manufacturer in China, the company holds close to 200 enamel-related patents, produces roughly 300,000 enamel-coated steel plates a year, has completed more than 30,000 installed projects and supplies its tanks to over 100 countries. The new 150,000 m² production base was added to raise output capacity, and single tanks are supplied up to 60,000 m³. Manufacturing runs under ISO 9001 and ISO 45001, with product certification including NSF/ANSI 61, WRAS, FDA, LFGB, CE (EN 1090), ISO 28765, FM, BSCI and EUROCODE, and design referenced to AWWA D103-09, AWWA C550 and NFPA where the application requires it.
For farm liquid handling the application is a storage volume calculated from the emptying window, a cover and vent sized against the ammonia load and the odour control strategy, and a bolted panel system that lets the herd expand without bringing a welding contractor to site.
Frequently Asked Questions
Q1: Does septic stored manure corrode the tank?
A1: The enamel surface is inert across pH 1–14 and, below 0.8 µm Ra, holds far less of the biofilm and scale layer where corrosive microbes sit. The steel substrate is protected by the fused glass, so the failure mode to watch is mechanical chipping at panel edges rather than chemical thinning.
Q2: How is the tank sized for a farm?
A2: From the daily liquid production multiplied by the required storage days between emptying, plus freeboard for foam and scum. The cropping or treatment calendar sets the storage interval, not the average daily flow.
Q3: Can the tank be made larger after installation?
A3: Yes. Extra courses can be added to the existing shell or a parallel tank can be tied into the same header. The concrete ring beam has to be verified for the additional load before the extension proceeds.
Q4: What is required for odour?
A4: A roof cover with a vent sized for vapour displacement and gas generation, the vent routed to the site odour control unit, and mixing that prevents a scum crust over the outlet. Covering and mixing do more than any coating change.
Q5: Is the tank rated for pressure from digester gas?
A5: No. The enamel tank is atmospheric or low-pressure storage. Any digester gas space is held at only a few kilopascals and is handled by the digester cover and its pressure relief, which is a separate scope from the storage tank.
Q6: How often is the tank inspected?
A6: Visually at each emptying, with a bolt torque check after the first fill and after the first year, a check of the external coating and the annulus drainage, and a spark retest on any panel removed and refitted. Thirty years is the design life.
Q7: What documents come with the delivery?
A7: Panel mill certificates, enamel thickness and spark test records, bolt grade and torque records, the external coating inspection report, assembly drawings and an operation and maintenance manual with the inspection schedule.
For pig farm liquid handling, the question is not whether a coating will survive but whether the shell can be washed, extended and kept in service across a thirty-year herd cycle, and the fused enamel panel answers all three better than concrete or an applied lining. The engineering inputs are the daily production, the storage interval and the emptying window, the ammonia and cleaning-chemistry content, and the site's odour obligations. A glass fused to steel tank for a global pig farm wastewater treatment project reduces the number of unplanned clean-outs and gives a practical route to added capacity when the barns are expanded. Send the herd size, the flushing volume and frequency, the storage days, the plot and the emptying calendar, and the selection becomes a dated delivery and inspection package.
Talk to an Engineer
Send the number of places and stocking density, the flush volume and frequency, the storage days between emptying, the ammonia and cleaning-agent content, the plot boundaries and the permission or odour conditions on the site. The engineering team will return a diameter and height, panel and bolt schedule, mixer and nozzle layout, cover and vent recommendation, foundation load and an erection plan. If a different shell material fits the duty better, that option is stated alongside the enamel solution with its reason, not presented as a replacement.
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