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LPG Cylinder Bank Sizing Calculator

Calculate LPG cylinder bank size for commercial kitchens, hotels and industrial use. Consumption, cylinders per bank and changeover timing. NFPA 54.

📐 Standard: NFPA 54 / IGC
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LPG Cylinder Bank Sizing Calculator
Reference: NFPA 54 / IGC
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Calculate LPG cylinder bank size for commercial kitchens, hotels and industrial use. Consumption, cylinders per bank and changeover timing. NFPA 54.
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ℹ About This Calculator

Commercial and industrial LPG installations use cylinder banks - multiple cylinders connected in parallel through a manifold - to meet high flow demands that a single cylinder cannot supply. NFPA 54 specifies the design of LPG bulk storage and distribution. A two-bank auto-changeover system ensures uninterrupted gas supply - when the duty bank exhausts, the standby bank automatically takes over.

IGC (US Gas Council) regulations and NFPA 54 govern commercial LPG installations. For flows above 10 kg/hr, a forced vaporiser is often needed as cylinders cannot supply sufficient vapour by natural vaporisation (especially in cold weather). PESO (Petroleum and Explosives Safety Organisation) approval is required for LPG installations in commercial premises. The installation must include a pressure regulator, manual shutoff valve, excess flow valve, and pressure relief valve.

LPG Bank Sizing Formula (NFPA 54)

NFPA 54 / IGC

LPG Consumption Rate: Consumption (kg/hr) = Total Appliance Load (MJ/hr) / CV_LPG CV_LPG = 46 MJ/kg (calorific value) Daily Consumption: kg/day = kg/hr × operating hours per day Cylinders per Bank: N = (Daily_kg × standby_days) / cylinder_capacity (kg) Round up to next whole number Cylinder capacity: 14.2 kg (domestic), 19 kg (commercial), 47.5 kg (industrial) Vaporisation Rate Check: Each 19 kg cylinder: max 0.5 kg/hr continuous vaporisation If demand > N × 0.5 kg/hr: add more cylinders or use vaporiser

Worked Example

A hotel kitchen has a total LPG appliance load of 220 MJ/hr, operating 12 hours a day. Consumption rate = 220 / 46 ≈ 4.78 kg/hr, so daily use = 4.78 × 12 ≈ 57.4 kg/day.

For a 3-day standby using 19 kg commercial cylinders: N = (57.4 × 3) / 19 ≈ 9.06, rounded up to 10 cylinders per bank (20 total with an equal standby bank). Vaporisation check: 10 cylinders can supply up to 10 × 0.5 = 5.0 kg/hr, comfortably above the 4.78 kg/hr demand, so natural vaporisation is sufficient and no forced vaporiser is required.

Frequently Asked Questions

How many LPG cylinders does a commercial kitchen need per day? +
A typical commercial restaurant using 150 MJ/hr total appliance load: consumption = 150/46 = 3.26 kg/hr × 10 hours = 32.6 kg/day. With 19 kg commercial cylinders: 32.6/19 = 1.7 cylinders/day → approximately 2 cylinders per day. For a 3-day standby bank: 6 cylinders per bank, with an equal standby bank = 12 cylinders total on site.
What is the maximum flow rate from a single LPG cylinder? +
A 19 kg commercial LPG cylinder can vaporise approximately 0.3–0.5 kg/hr by natural vaporisation at 20°C ambient. At lower temperatures or when the cylinder is nearly empty, vaporisation rate drops further. For higher demand: connect multiple cylinders in parallel. For sustained flows above 5 kg/hr, a forced vaporiser (electric or hot water heated) is recommended to ensure consistent gas supply.
Do I need PESO approval for a commercial LPG installation? +
Yes. PESO (Petroleum and Explosives Safety Organisation) under the Ministry of Commerce and Industry regulates LPG storage and distribution. For installations with more than 2 cylinders connected simultaneously, or with any bulk storage, PESO licensing is required. The installation must be done by a licensed PESO contractor and inspected before commissioning.
What is an auto-changeover regulator and how does it work? +
An auto-changeover regulator connects two cylinder banks and automatically switches to the standby bank when the duty bank pressure drops below a set point (indicating the bank is nearly empty). A visual indicator shows which bank is duty and which is standby. The changeover is seamless - no gas supply interruption. This is the standard setup for commercial kitchens and industrial gas users who cannot tolerate supply interruption.
Can I mix 14.2 kg and 19 kg cylinders in the same bank? +
No - all cylinders in a manifolded bank must be the same type and capacity. Mixing different cylinder sizes creates unequal draw rates, leading to some cylinders running empty while others still have gas - this can cause liquid LPG to enter the manifold from the heavier cylinders when they empty. Always use identical cylinders in each bank.

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