1-2-NKV

Summary

Product Identification

DAB PUMPS 1/2 NKV fire-fighting pump units with vertical NKV pumps. These units are available as single pump sets (1 NKV PUMPS) or sets with two pumps (2 NKV PUMPS), and can also include a pilot pump.

Compliance and Application

These pump units are manufactured in compliance with European standard UNI EN 12845, which establishes design, installation, and maintenance criteria for automatic sprinkler systems.

They are suitable for:

• Sprinkler installations with manual stopping of the main pump.
• Hydrant installations (referencing UNI 10779-July 07) with automatic stopping of pumps 20 minutes after closure of hydrants, in cases of work not constantly supervised.

The document also provides guidance for selecting pump sets to supply water to apartments, hotels, hospitals, and similar buildings.

Operating Principles

In normal conditions (zero water demand), the system is maintained under static pressure.

1. Jockey Pump Start-up: The first demand for water activates the jockey pump to restore system pressure.
2. Main Pump Start-up: If a significant flow rate of water is demanded (e.g., opening of sprinklers), the pressure drops until two pressure switches connected in series trip, starting the main pump.

Operating Parameters

Main Pump Start-up Pressure Calibration (based on maximum pump pressure):

• One Pump Sets: P = 0.8 x Max. Pump Pressure
• Sets with Two Pumps:
  • Pump 1: P1 = 0.8 x Max. Pressure
  • Pump 2: P2 = 0.6 x Max. Pressure
  • Example: If Max. pressure is 10 bar, pump 1 starts at 8 bar, and pump 2 starts at 6 bar.

Minimum Residual Pressure for Building Water Supply:

• A minimum pressure of 1 bar (approximately 10 m) is required at the most distant user point.
• When selecting a pump set, there must be at least 2 bar (20 m) between the curve start and curve end.

Model Information

The document lists various models and their corresponding codes for both 1 NKV and 2 NKV pump configurations, including options with and without pilot pumps (JET or KV series).

1 NKV PUMPS (Single Pump Sets):

• Models include 1NKV 10/X T400/50 EN12845, 1NKV 15/X T400/50 EN12845, and 1NKV 20/X T400/50 EN12845 series, where 'X' denotes varying stages (e.g., 3, 4, 5, up to 14).
• Pilot pump options are indicated by suffixes like "- JET", "- KV 3/10", "- KV 3/12", or "- KV 3/18".
• See the official PDF for exact tabulated values and codes.

2 NKV PUMPS (Two Pump Sets):

• Models include 2NKV 10/X T400/50 EN12845, 2NKV 15/X T400/50 EN12845, and 2NKV 20/X T400/50 EN12845 series, where 'X' denotes varying stages (e.g., 3, 4, 5, up to 14).
• Pilot pump options are indicated by suffixes like "- JET", "- KV 3/10", "- KV 3/12", or "- KV 3/18".
• See the official PDF for exact tabulated values and codes.

Pump Set Selection Guidelines

To choose a pump set for apartments, hotels, or hospitals, two basic items of information are required: the amount of water needed (flow rate Q) and the height to which it must be pumped (head H).

Typical Water Consumption (per fixture):

• Toilet with direct flush valve: 90 l/min
• Bath tub: 15 l/min
• Shower: 12 l/min
• Washing machine: 12 l/min
• Dishwasher: 10 l/min
• Kitchen sink: 9 l/min
• Wash basin: 6 l/min
• Bidet: 6 l/min
• Toilet with cistern flush: 6 l/min

Flow Rate (Q) Adjustments:

• For apartments with two bathrooms, increase flow rate by 30%.
• For apartments with three bathrooms, increase flow rate by 25%.
• For apartments with four bathrooms, increase flow rate by 20%.
• For holiday resorts, multiply the number of apartments by 1.2.
• Graphs are provided in the official PDF to calculate water consumption (m³/h) based on the number of apartments (with cisterns or water meters) or beds (for hotels/hospitals). See the official PDF for exact tabulated values.

Head (H) Calculation: The pump set head is calculated considering building height, leakage, residual pressure, and water mains pressure.

• H = (building H + leaks H + residual H) – water mains H (m)
• Assuming leaks amount to approximately 20% of building H, and a residual pressure of 10 m (1 bar), the simplified formula is: H = (1.2 x building H + 10) – water mains H (m)

Selection Steps:

1. Calculate flow rate Q from the number of apartments or beds.
2. Calculate head H from the building height and water mains pressure.
3. Choose a pump set from the provided tables whose curve end point coincides with the calculated Q and H values, ensuring at least 2 bar (20 m) between the curve start and curve end.

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Disclaimer: This summary is based on extracted text and may miss figures, footnotes, or revisions present in the full OEM PDF. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror