High-rack storage: sprinklers by storage height
Choose commodity group and agent, enter storage height and room height. The tool looks up TCVN 7336:2021 Table 5.2, corrects for ceilings above 10 m, and gives density, design flow, operating heads and 60-minute water supply.
Group 5, water, storage 3.5 m: density 0.320 L/s·m², flow 60.0 L/s, 60-minute water about 216 m³.
Preliminary results
| Step | Result | Basis |
|---|---|---|
| Storage height bandh = 3.5 m ≤ 5.5 m | 3–4 m | TCVN 7336:2021 Bảng 5.2 ⚠ |
| Table 5.2 (density · minimum flow)Group 5 – ordinary combustibles (paper, wood, textiles, cartons) · Water | i = 0.320 · Q ≥ 60.0 L/s | TCVN 7336:2021 Bảng 5.2 ⚠ |
| Ceiling above 10 m (+10 % per 2 m)H = 8.0 m → 1 + 0,1 × 0 | × 1.0 | TCVN 7336:2021 Bảng 5.2 chú thích 3 |
| Flow = density × 90 m², not less than table flowmax(0.320 × 90; 60.0) | 60.0 L/s | TCVN 7336:2021 Bảng 5.1 ⚠ |
| Operating heads⌈90 / 9⌉ | 10 heads | TCVN 7336:2021 Bảng 5.1 ⚠ |
| Water supply3,6 × 60.0 × 60/60 | 216 m³ | TCVN 7336:2021 Bảng 5.1 |
- Design area 90 m², 9 m² per head, 60-minute discharge (TCVN 7336:2021 Table 5.1 for storage) ⚠.
- Clearance from top of goods to deflector ≥ 0.5 m (≥ 0.9 m for high-challenge goods).
- Rack storage above 5.5 m: outside TCVN 7336:2021; needs in-rack sprinklers per tier or ESFR, special design.
- Which warehouses need automatic suppression: QCVN 10:2025/BCA Table A.1.
Suggested materials
TCVN 7336:2021 Table 5.2: density (L/s·m²) · minimum flow (L/s)
| Storage height | Group 5 · Water | Group 5 · Foam solution | Group 6 · Water | Group 6 · Foam solution | Group 7 · Water | Group 7 · Foam solution |
|---|---|---|---|---|---|---|
| ≤ 1 m | 0.08 · 15.0 | 0.04 · 7.5 | 0.16 · 30.0 | 0.08 · 15.0 | — | 0.10 · 18.0 |
| 1–2 m | 0.16 · 30.0 | 0.08 · 15.0 | 0.32 · 60.0 | 0.20 · 36.0 | — | 0.20 · 36.0 |
| 2–3 m | 0.24 · 45.0 | 0.12 · 22.5 | 0.40 · 75.0 | 0.24 · 45.0 | — | 0.30 · 54.0 |
| 3–4 m | 0.32 · 60.0 | 0.16 · 30.0 | 0.40 · 75.0 | 0.32 · 60.0 | — | 0.40 · 75.0 |
| 4–5.5 m | 0.40 · 75.0 | 0.32 · 37.5 | 0.50 · 90.0 | 0.40 · 75.0 | — | 0.40 · 75.0 |
Rooms higher than 10 m: multiply density and flow by 1 + 0.1 per 2 m above. Group 7 does not use water. Highlighted cell is the current case. ⚠ pending check against the original.
Frequently asked questions
Can I use this for 8 m high storage?
No. TCVN 7336:2021 covers storage up to 5.5 m only. Higher storage needs in-rack sprinklers or ESFR per NFPA 13, FM Global 8-9, with a dedicated design and approval.
Why is the flow larger than density × 90 m²?
Table 5.2 also gives a minimum flow. Take the larger of density × design area and the table flow.
How about a 14 m ceiling?
Table 5.2 note 3: each 2 m above 10 m adds 10 %. 14 m is 4 m above, two steps, factor 1.2.
Can water protect paint and solvent storage?
Group 7 (flammable liquids) in Table 5.2 lists foam solution only; water cannot extinguish floating liquid fires.
Applicable documents
Documents in force at the update date, applied from 1 July 2026. TCVN standards are mandatory only when a QCVN refers to them; where they differ, the QCVN prevails.
| Code | Title | Effective from | Status |
|---|---|---|---|
| QCVN 10:2025/BCA | Trang bị, bố trí phương tiện PCCC và CNCH cho nhà và công trình | 30/12/2025 | In force |
| TCVN 7336:2021 | Hệ thống chữa cháy tự động bằng nước, bọt – Yêu cầu thiết kế, lắp đặt | Voluntary | In force ⚠ |
| QCVN 06:2022/BXD + SĐ1:2023 | An toàn cháy cho nhà và công trình | 16/01/2023 | In force ⚠ |