DvGA-500 and DvGA-630: technical specs of Dieselmash natural gas engine generators

DvGA-500 and DvGA-630: technical specs

КГУ 500 кВт чи дизельний генератор 500 кВт: що обрати підприємству

A detailed overview of Dieselmash flagship natural gas units - DvGA-500 and DvGA-630: technical specs. What's inside, what's the power, what's the lifespan, where they're used, who's already running them, and what you need to know upfront so connection and commissioning go without surprises.

Where these units fit in the product line

DvGA-500 and DvGA-630 are the mid-range gas engine generators from Dieselmash-CGU. In terms of electrical output they cover the most sought-after range for Ukrainian business: 500 kW as the universal choice and 630 kW as a "grow-into" option.

Both units are stationary, designed for 24/7 industrial operation. They run on low-pressure natural gas and can integrate into the facility's thermal network via heat recovery exchangers.

The product line also includes other outputs — 315 kW for small sites, 750 kW for large ones. But it's the DvGA-500 and DvGA-630 that account for around 70% of real inquiries: dairy plants, meat processing, mid-sized greenhouses, district heating in small and mid-sized towns, agricultural facilities with processing operations.

Technical specifications of the DvGA-500

The unit is built around the 6GChN25/34 gas engine, developed and produced at Dieselmash-CGU. The 6GChN25/34 designation stands for: 6 cylinders, gas-fuelled (G), four-stroke (Ch), turbocharged (N), cylinder diameter 250 mm, piston stroke 340 mm.

Key parameters of the unit in standard configuration:

Engine-generator dimensions: length 5,835 mm, width 1,900 mm, height 2,630 mm, dry mass 15,100 kg. In the container version with sound-proof enclosure, the full module occupies 25–30 m². Important to factor in when planning the foundation and site.

■  Nominal electrical power — 500 kW.

■  Recovered thermal power — around 720 kW (at full load with a properly connected thermal loop, per feasibility study data).

■  Rotation speed — 600 rpm nominal (medium-speed engine, which is what defines the high lifespan and low noise).

■  Rated gas consumption at full load — 133 Nm³/hour (with natural gas calorific value 8,600 kcal/Nm³). Per the feasibility study at 0.9 utilization factor — around 135 Nm³/hour (0.3 Nm³ per kWh of generated electricity).

■  Electrical efficiency — up to 38%.

■  Fuel utilization factor in cogeneration mode — up to 90–92%.

■  Lifespan before major overhaul — no less than 80,000 operating hours.

■  Total lifespan — 240,000 operating hours.

■  Overall unit service life — 20–25 years.

Technical specifications of the DvGA-630

The DvGA-630 is built around the 8GChN25/34 engine — same platform, but 8 cylinders instead of 6. This gives more power with comparable lifespan and reliability.

Engine-generator dimensions: length 6,640 mm, width 1,900 mm, height 2,630 mm, dry mass 19,350 kg. In the container version the full module occupies 30–35 m². Worth checking against the available site when choosing between models.

■  Nominal electrical power — 630 kW.

■  Recovered thermal power — around 900 kW.

■  Rotation speed — 600 rpm nominal.

■  Rated gas consumption at full load — 167 Nm³/hour (with calorific value 8,600 kcal/Nm³).

■  Electrical efficiency — around up to 38%.

■  Fuel utilization factor in cogeneration mode — up to 90–92%.

■  Lifespan before major overhaul — no less than 80,000 operating hours.

■  Total lifespan — 240,000 operating hours.

■  Overall unit service life — 20–25 years.

Datasheet — technical specifications summary

Below is a summary of technical parameters for the Dieselmash-CGU gas engine-generator product line. Data is given at natural gas calorific value 8,600 kcal/Nm³ (36,000 kJ/Nm³) — the standard reference value.

Who already operates Dieselmash units

Dieselmash-CGU has been active in the Ukrainian cogeneration market since the early 2000s. Flagship reference sites that can be visited or studied through documentation:

The variety of fuel types — natural gas, biogas, pyrolysis gas, landfill gas — demonstrates the platform's adaptability to different feedstock.

■  MCE "Khmelnytskteplokomunenergo" — 15 units, total output 7.5 MW, operating since 2002. The largest and oldest reference.

■  CE "Mistteplovodenergiya" of Kamianets-Podilskyi — 7 units, total output 4.15 MW, since 2010.

■  JSC "Oblteplokomunenergo" of Chernihiv — 2 units, total output 1.0 MW, since 2023.

■  PE "Sigma" of Dnipro — 315 kW on biogas, since 2015.

■  SE "Ekoenergiya Plant" of "Polvax-Ukraine" LLC — 3 units, total output 1.89 MW on pyrolysis gas, since 2020.

■  PE "MPP Lateks" — 0.5 MW on landfill gas, since 2019.

■  And many others.

Technology partners

Dieselmash-CGU units use components from leading European manufacturers, delivering world-class reliability at Ukrainian pricing:

Selection rule: if your base load is in the range of 400–500 kW — take the DvGA-500. If 550–620 kW — the DvGA-630. If more — consider a cascade of two units or the DvGA-750.

Production is certified to ISO 9001:2015 and located in Pervomaisk, Mykolaiv region — far from the combat zone, which has allowed stable production cycles to be maintained even in recent times.

■  HEINZMANN (Germany) — engine control automation and fuel systems. One of the leading European brands in this category.

■  PBS TURBO (Czech Republic) — turbochargers for charge air. A classic European choice for medium-speed engines.

Operation: what to know upfront

Before purchase it's useful to understand a few practical points that often surface only after the contract is signed and may require additional expense.

First — gas quality. The units are designed for natural gas per Ukrainian standards, but actual gas quality varies across Ukrainian regions. In some regions, the calorific value of natural gas differs significantly, which directly affects gas consumption during the operation of the cogeneration unit. Therefore, at the design stage, it is essential to analyze the gas composition and calorific value at the connection point and take these parameters into account when preparing the feasibility study (FS).

The second important factor is gas pressure. Cogeneration units are typically designed to operate with a medium gas pressure of 0.1–4 bar. If the available gas pressure at the connection point is low (below 0.1 bar), this must be considered when selecting the gas equipment included in the CHP (cogeneration unit) supply package. Third — the thermal network. Heat recovery makes economic sense only if the facility can actually use the heat. If you have no thermal network, or heat demand only in winter, CHP efficiency drops. It's better to honestly assess annual heat consumption at the feasibility study stage.

Fourth — the site. You need a level foundation, ventilation or a climate-controlled container version, separate exhaust with a silencer, cable entries to the main switchboard, thermal mains to your boiler house. All of this is best designed in advance.

What's included in the turnkey package

The word "turnkey" in the contract should mean an actually working installation, not just equipment on your foundation. Clarify what's included in the price:

■  The engine-generator itself with frame and, optionally, a sound-proof enclosure.

■  Automation cabinet with grid synchronization and monitoring.

■  Heat recovery exchangers for exhaust gases and cooling system.

■  Exhaust system with silencer and stack.

■  Electrical connection to the main switchboard.

■  Gas pipeline connection (usually after the meter — the section before it is coordinated by the local gas utility).

■  Commissioning work with test runs under load.

■  Training of your operating personnel.

■  Documentation and passports for all components.

■  Warranty 2 years (standard) with option to extend to 3.

Timelines from order to launch

Realistic timeline from contract signing to industrial launch — 4–6 months. Breakdown by stage:

If you're planning launch by the heating season — the order needs to be placed in spring or, at latest, July–August. By October–November the unit will be running in industrial mode.

■  Design and obtaining technical conditions — 4–6 weeks.

■  Manufacturing at the plant — 8–10 weeks.

■  Delivery to site and installation — 2–3 weeks.

■  Commissioning and test runs — 2–3 weeks.

■  Acceptance testing and signing of protocols — 1 week.

If the DvGA-500 or DvGA-630 looks like the right model for your facility — the next step is an individual commercial proposal. We'll ask for data on your load profile, gas availability, and site dimensions — and prepare a precise quote with price, delivery scope and timelines. Per the specific feasibility study of 01.07.2026, payback for a 500 kW natural gas unit at UAH 30/Nm³ is 1.7 years.

Need exact specifications and pricing for your site?

Request a commercial offer — we'll prepare it within 2 business days accounting for your conditions: load profile, gas characteristics, site dimensions.

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