Hexonic LB31-60H-2S-1 2-pass brazed plate heat exchanger, 1", 60 plates, PN 30
- Application: HIU (heat interface unit) integrated scheme — heating + DHW circulation
- Heat capacity: ~90-180 kW (depending on operating mode)
- Nominal pressure: PN 30 (30 bar)
- Connection: G 1" external threads + 2 additional vent/return connections (K1, K2)
Where LB31-60H-2S-1 is used
The 2-pass with 6-connection configuration is designed for integrated substation schemes where a single exchanger combines district heating secondary loop return with DHW circulation. This saves technical room space, reduces valve count, and simplifies hydraulic balancing compared to a two-unit solution. The 60-plate model is typically selected for medium-to-large capacity multi-family substations or commercial buildings.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 0203-0671 |
| Series | Hexonic LB31 |
| Model | LB31-60H-2S-1 |
| Number of plates | 60 |
| Plate profile | H (higher chevron angle) |
| Passes | 2 (2-pass with 6 connections) |
| Additional connections | K1 — district heating return / K2 — DHW circulation |
| Nominal pressure (PN) | 30 bar |
| Max working temperature | 230 °C |
| Min working temperature | -195 °C |
| Main connection | G 1" external thread |
| Plate material | Stainless steel AISI 316L (1.4404) |
| Brazing filler | Copper (Cu) |
| Plate dimensions | 286 × 113 mm |
| Unit depth (F) | ~151.0 mm (formula: 10 + 2.35 × N, N = 60) |
| Weight | ~8.4 kg |
| Construction | Brazed, hermetic (gasket-free) |
| Media | Water, glycol solutions up to 50 % |
Heat transfer capacity — quick calculation
The 2-pass configuration achieves a higher effective ΔT in the same plate pack — passes are connected in series so LMTD grows. General formula: P = Q × ΔT × 1.163 (kW, Q m³/h, ΔT °C).
Example for heating mode (primary 90/70 °C → secondary 65/40 °C): 2-pass with Q ≈ 4.6 m³/h and effective ΔT ≈ 25 °C → P ≈ 135 kW. Pressure drop in 2-pass packs is always higher than 1-pass — check Δp at the design stage.
When to choose LB31-60H-2S-1
- When an integrated heating + DHW circulation scheme in a single unit is needed
- When the technical room is small and space savings matter
- When reducing valve count and hydraulic balancing complexity is a priority
- When capacity demand is ~90-180 kW
When to choose an alternative (1-pass model)
- When heating and DHW use separate units (classic scheme)
- When minimum Δp is required — 1-pass has lower pressure drop
- When pump head is limited
B2B delivery and logistics via Amegata.lt
- 24-hour delivery across Lithuania (from our warehouse in Vilnius)
- Competitive B2B pricing — often below market average
- 30-day payment terms for companies (per contract)
- Free technical consultation for 2-pass scheme selection
Official Hexonic catalogue: hexonic.com/brazed-plate-exchangers/L
Frequently asked questions
What does "2S" mean in the model code?
"2S" means 2-pass with 6 connections. Plates are divided into two groups connected in series. Additional K1 and K2 connections are used: K1 — district heating network return; K2 — DHW circulation return. This enables one unit to combine heating and DHW.
Is 2-pass better than 1-pass?
Not always. 2-pass delivers higher effective ΔT and a more compact scheme, but pressure drop is about 2-4× higher. Choose based on system constraints — if pump head is limited or integrated DHW is not required, two 1-pass units may be a better fit.
What maintenance is required?
Brazed gasket-free construction requires no disassembly maintenance. CIP flushing — every 3-5 years if fouling signs appear.
Is it suitable for regions with aggressive water?
District heating water with elevated chlorides can shorten copper brazing service life. In such cases we recommend the Hexonic Luna series (stainless steel brazing) or gasketed exchangers. For hard water with elevated Ca/Mg carbonate content, limescale gradually builds up on the plates and reduces heat-transfer efficiency; for such systems gasketed (plate-and-frame) exchangers are preferable, as they can be periodically opened for mechanical or CIP cleaning. Contact us — we will select a suitable variant.
Is insulation needed?
Recommended — in substations, insulation reduces heat losses and protects service personnel. The Hexonic APFI series insulation fits LB31-width models (plate count groups: 41-60, 61-80, 81-100, 101-120).
