SNG (Substitute Natural Gas) is an “artificially” produced natural gas mixture made from propane (LPG) and ambient air. The composition of SNG provides comparable calorific valu es to natural gas, allowing flexible and safe operation of existing gas installations. With the PP-TEC SNG blending unit, your company’s existing infrastructure can be efficiently supple mented without complex retrofitting.

Advantages of aPPT- Propane/Air Gas Mixing System:
• Supply with either propane or natural gas
• Independence from individual energy suppliers
• Flexible switching of energy media during operation (e.g., via ball valve)
• Existing burners and pipelines generally do not need to be modified, only supplemented
• High supply security in case of price or availability changes Mix ratio: 56 % LPG / 44 % air
• Result: Wobbe index comparable to pure natural gas (Wobbe Index ≈ 14-15 kWh/m³)

PP-TEC Mixing Unit (Propane/Air) is a Venturi mixing unit. How does a Venturi mixing unit work? A Venturi mixing unit uses the Venturi principle to efficiently mix liquids or gases. Through a characteristic narrowing (nozzle) in the pipe, the velocity of the flowing medium increases. This velocity increase causes a pressure drop, allowing a second medium to be automatically drawn in and mixed into the main stream – without mechanical pumps or moving parts.

Key advantages of the Venturi system:
• High mixing accuracy, even at low flow rates
• Energy-efficient, since the mixing process relies only on flow dynamics
• Low maintenance, due to the absence of moving components

The PPT mixing units (Propane-Air) are available as a standalone mixer or as a mixer-battery. In both cases, the PPT mixing system can be combined with one or more PPT vaporizers

Documentation and Compliance
• CE Declaration and CE Marking
• Conformity assessment procedure A2 for devices of category 2 according to Directive 2014/68/EU (Pressure Equipment Directive)

Applied Harmonized European Standards
• DIN EN ISO 9692-1 – Testing of welding personnel
• DIN EN ISO 60079-15 – Electrical equipment for explosive atmospheres (protection type “n”)
• DIN EN 61439 – Low-voltage switchgear assemblies – Part 1
• DIN EN ISO 80079-36 – Non-electrical equipment for use in explosive atmospheres
• DIN EN 14121 – Safety of machinery – Guidelines for risk assessment
• DIN EN 1127 – Explosive atmospheres – Explosion protection
• DIN EN 61000 – Electromagnetic compatibility
• DIN EN 60204-1 – Safety of machinery – Electrical equipment of machines

Other Applied Technical Specifications
• TRBS 3146 – Liquefied gas storage tank installations
• AD 2000-Regelwerk – Rules for design and operation of pressure vessels