Bolt pattern matches your existing foundation. Flanges align with your current pipework. FRP shell rated for 15–20 years of service. Back in production within 24–48 hours instead of weeks waiting for new concrete to cure.
If your facility is facing any of the situations below, the LH should be your first call.
Corroded galvanized shell, cracked fan blades, overloaded motor, leaking basin. Every hour of downtime is lost revenue — and patching the same problems over and over is no longer cost-effective.
Square towers have a completely different base footprint and flange layout compared to round towers. New foundation work and pipe modifications typically add 30–50% to total project cost — plus 1–3 extra weeks of production downtime.
Fresh concrete needs 7–14 days to reach full strength. Pipe rerouting adds another 3–5 days. That's 1–3 weeks of lost production — while your customers' orders keep coming in.
The LH base bolt pattern is designed to match your existing concrete foundation
The LH is a round tower. Its anchor bolt spacing follows the most common round tower standard in the Vietnamese and Southeast Asian market. Once the old tower is removed, the LH sits directly on the existing concrete pad — bolt it down and you're done.
No civil contractor. No waiting for concrete to cure. A mechanical installation crew can crane the tower into position and secure the base in a matter of hours.
The LH's inlet and outlet flanges (DN40–DN300 depending on model) are positioned at the same elevation and orientation as standard round cooling towers. In most installations, you simply remove the old flange, fit a new gasket, and tighten the bolts.
This eliminates pipe cutting, welding, and adapter fitting entirely — historically the most time-consuming and expensive part of any tower replacement project.
The LH shell is moulded from FRP (fibre-reinforced polyester). It does not corrode in the presence of salt spray, mild acid fumes, or high humidity — the exact conditions that cause galvanized steel shells in Vietnam to rust severely within 3–5 years in coastal locations.
Designed service life: 15–20 years. Routine maintenance covers only fill pack cleaning and motor inspection — there is no shell replacement in the design lifecycle.
24 models — select by flow rate or existing tower diameter
Design conditions: inlet 37 °C, outlet 32 °C, wet-bulb 27 °C. Match by required flow rate or existing foundation diameter.
| Model | Flow rate (m³/h) | Tower Ø (mm) | Height (mm) | Fan Ø (mm) | Motor (kW) | Dry weight (kg) | Pipe connection (DN) |
|---|---|---|---|---|---|---|---|
| LH-10 | 7.8 | 930 | 1,740 | 635 | 0.18 | 46 | 40 |
| LH-15 | 11.7 | 1,070 | 1,630 | 635 | 0.37 | 54 | 50 |
| LH-20 | 15.6 | 1,170 | 1,870 | 770 | 0.55 | 67 | 50 |
| LH-25 | 19.5 | 1,380 | 2,095 | 770 | 0.75 | 98 | 80 |
| LH-30 | 23.4 | 1,660 | 1,965 | 770 | 0.75 | 116 | 80 |
| LH-40 | 31.2 | 1,660 | 2,050 | 930 | 1.50 | 130 | 80 |
| LH-50 | 39.2 | 1,880 | 2,250 | 930 | 1.50 | 190 | 80 |
| LH-60 | 46.8 | 2,100 | 2,350 | 1,180 | 1.50 | 240 | 100 |
| LH-80 | 62.4 | 2,100 | 2,490 | 1,180 | 1.50 | 260 | 100 |
| LH-100 | 78.1 | 2,910 | 2,770 | 1,450 | 2.25 | 500 | 125 |
| LH-125 | 97.5 | 2,910 | 2,870 | 1,450 | 2.25 | 540 | 125 |
| LH-150 | 117 | 2,910 | 2,870 | 1,450 | 2.25 | 580 | 150 |
| LH-175 | 136.8 | 3,360 | 3,070 | 1,750 | 4.0 | 860 | 150 |
| LH-200 | 156.2 | 3,360 | 3,070 | 1,750 | 4.0 | 880 | 150 |
| LH-225 | 175.5 | 4,150 | 4,040 | 2,100 | 5.5 | 1,050 | 200 |
| LH-250 | 195.1 | 4,150 | 4,040 | 2,100 | 5.5 | 1,080 | 200 |
| LH-300 | 234 | 4,730 | 4,260 | 2,400 | 7.5 | 1,760 | 200 |
| LH-350 | 273.2 | 4,730 | 4,260 | 2,400 | 7.5 | 1,800 | 200 |
| LH-400 | 312.1 | 5,600 | 4,610 | 2,745 | 11.0 | 2,840 | 200 |
| LH-500 | 392.4 | 5,600 | 4,610 | 2,745 | 11.0 | 2,900 | 250 |
| LH-600 | 468 | 6,600 | 5,230 | 3,400 | 15.0 | 3,950 | 250 |
| LH-700 | 547.2 | 6,600 | 5,230 | 3,400 | 18.5 | 4,050 | 250 |
| LH-800 | 626.4 | 7,600 | 5,475 | 3,700 | 22.0 | 4,700 | 300 |
| LH-1000 | 780 | 7,600 | 5,475 | 3,700 | 22.0 | 4,900 | 300 |
Not sure which model fits your foundation?
Send your existing foundation drawing (or just the base diameter and required flow rate) and COOLTEK's engineering team will confirm the compatible model within 48 hours.
Submit project detailsSix industries that regularly replace aging round cooling towers with the LH
Common requirement: an existing round cooling tower that has reached end of service life and needs fast replacement without extended production shutdown.
Injection moulding machines need continuous cooling water. Tower down means mould down. The LH gets you back online in 24–48 hours without disrupting your delivery schedule.
Processing lines run to seasonal peaks. When the cooling tower fails mid-season, the LH restores production faster than any other replacement option.
Dyeing machines require stable cooling water temperature. A degraded tower causes thermal fluctuations that directly affect fabric quality and batch consistency.
CNC machines, grinders, and heat-treatment furnaces all depend on stable cooling water. The LH replaces the failed tower without shutting down the workshop floor.
Acid fumes and chemical vapour accelerate galvanized steel corrosion. The LH's FRP shell resists chemical attack, making it well-suited for plants with mild acid exhaust environments.
A failed rooftop cooling tower on a commercial building means structural reinforcement if you switch to a square tower. The LH keeps the same footprint and load, and the same pipe positions.
LH Series Built for Fast Industrial Cooling Tower Replacement
Beyond basic cooling capacity, COOLTEK offers advanced tower series purpose-built for complex operating requirements — noise compliance, energy saving, explosion-proof zones, and closed-circuit water treatment
Three-shift plant near a residential zone, QCVN 26:2025 compliance required. The LHR ultra-low noise configuration reaches 53–56 dBA at source.
See LHRLimited installation space or outlet temperature stability required at ±0.5 °C. The LHN is a vertical counterflow square tower with a smaller floor area.
See LHNThe LHRD uses a water turbine instead of an electric motor — no electrical power consumed by the fan, suitable for ATEX zones or plants targeting energy cost reduction.
See LHRDPharmaceutical, electronics, or ultrapure water systems requiring complete isolation. The AWA is a closed-circuit tower — process water flows inside copper tubes.
See AWAThe LH is engineered to be compatible with most standard round cooling towers common in the Vietnamese and Southeast Asian market. Anchor bolt spacing and flange positions follow widely-used industry standards. Before ordering, COOLTEK's engineering team will cross-reference your existing foundation drawings to confirm compatibility.
For a single tower under 200 m³/h, the complete process — removing the old tower, craning the LH into position, connecting flanges, and commissioning — typically takes 24–48 hours. Larger towers or multi-tower systems require 3–5 days.
Approximately 85% of installations achieve a direct flange match. For the remaining 15%, COOLTEK supplies custom-fabricated adapter spools machined to your actual pipe dimensions — still without cutting or welding the main pipeline.
In Vietnam's climate, galvanized steel shells typically show severe corrosion within 3–5 years in coastal areas and 5–8 years inland. The LH's FRP shell has a designed service life of 15–20 years and is unaffected by salt spray, mild acid fumes, or high humidity.
The LH is optimized for fast replacement, not noise reduction. If your facility needs to meet 45 dBA nighttime limits at residential boundaries under QCVN 26:2025, consider the LHR series — a crossflow square tower with an ultra-low noise configuration reaching 53–56 dBA at source.
When switching from a round to a square tower, new foundation work and pipe rerouting typically account for 30–50% of total project cost. With the LH, both of those line items are zero — you reuse the existing foundation and pipework. Total replacement cost with LH is typically 50–70% of a square-tower alternative.
The LH serves any industry currently operating aging round cooling towers: plastics, food and beverage, textiles, metalworking, chemicals, and commercial HVAC. The only requirement is that the existing tower has reached end of service life and needs replacement.
Standard lead time for models under 200 m³/h is 2–4 weeks. For larger models or multi-tower orders, contact COOLTEK's engineering team for a project-specific schedule.
Process
A practical walkthrough from foundation survey to commissioning, written for plant engineers managing 10–15-year-old round towers.
Read more
Materials
Corrosion mechanism analysis in coastal and inland environments, backed by field data from plants in Hai Phong and Binh Duong.
Read more
Cost analysis
A spreadsheet-based model covering downtime cost, infrastructure modification cost, and payback period when choosing LH over a square tower upgrade.
Read more
Selection guide
A four-question decision framework to identify the right tower series: fast replacement, noise reduction, compact footprint, or water isolation.
Read more
Operations
A quarterly inspection checklist to extend tower service life and catch early signs of degradation before they become costly failures.
Read more
Compliance
A summary of Vietnam's updated noise standard, penalty thresholds, and practical noise reduction options for industrial cooling systems.
Read more
Analysis
A detailed breakdown of the LH lifecycle phases — from initial installation through routine maintenance to the point of planned replacement.
Read more
Application
How the LH's FRP shell handles chemical corrosion in plants with mild acid exhaust, and what to specify for more aggressive environments.
Read moreSend your existing foundation drawing or a photo of the old tower — COOLTEK's engineering team will confirm the compatible LH model and deliver a replacement plan within 48 hours.
Talk to an engineer