Spherical and bullet-type pressure vessels engineered to store LPG, LNG, and NGL products safely under pressure — fabricated to ASME Section VIII and NFPA 58/59 with redundant relief protection.
An LPG storage tank holds propane, LNG, or NGL products in liquid form under enough pressure to keep them from vaporizing at ambient temperature. Unlike an atmospheric storage tank, it's a full pressure vessel — the design pressure is set by the equilibrium vapor pressure of the stored product at its maximum design temperature, not by an arbitrary safety margin. Get that number wrong and either the tank is underdesigned for a hot day, or overbuilt and needlessly expensive.
Fintelius selects spherical or bullet (horizontal cylindrical) geometry against the storage volume and site constraints, then engineers the shell, supports, and dual relief-valve system to NFPA equilibrium-pressure criteria and ASME Code, whether the tank ships aboveground, mounded, or for underground installation.
Every LPG tank follows the same disciplined path through design and fabrication.
Stored product's equilibrium vapor pressure at maximum design temperature (ambient plus solar radiation) sets the governing design pressure.
Spherical or bullet geometry, and aboveground, mounded, or underground installation, are selected against volume and site constraints.
Plate is rolled and formed to the design diameter and wall thickness, welded to spherical or cylindrical shell geometry.
All welds are radiographed and ultrasonically tested; thick sections undergo post-weld heat treatment per code.
The complete tank is hydrostatically tested, coated, and prepared for shipment or field erection with full documentation.
The most economical shell geometry for storage volumes above roughly 500 m³ — a sphere minimizes shell surface area, and therefore material and cost, for a given volume under pressure.
Typically used under 100 m³ and common in the 100–500 m³ range where total weight and installation logistics favor a cylindrical shape over a sphere.
Horizontal configuration by default regardless of capacity — buried or mounded on a concrete platform for space-limited or safety-driven site layouts.
These parameters are set by code and equilibrium physics, not estimated.
Design pressure is set to the stored product's equilibrium vapor pressure at maximum design temperature — per NFPA, roughly 41°C (underground), 46°C (>4.5 m³), or 54°C (≤4.5 m³).
Two pressure relief valves, each rated to 100% capacity, are mandated so one can be serviced or isolated without taking the tank out of service.
Excess-flow check valves limit release rate in the event of downstream piping failure, working alongside the primary relief system.
Integrated leak-detection instrumentation for early warning ahead of a release reaching hazardous concentration.
Optional temperature-control systems maintain product state and pressure within design limits across ambient extremes.
Legs, lugs, skirts, or saddles engineered for the tank's geometry, seismic zone, and foundation type.
Rolled shell and formed heads (or welded spherical segments) to the design diameter and wall thickness.
Fill, withdrawal, vapor equalization, relief, drain, and instrumentation nozzles with reinforcement pads; manways for internal access.
Legs, lugs, skirts, or saddles fabricated and welded to the vessel per site foundation and orientation requirements.
Protective coating options for above-ground weathering resistance and, where specified, corrosion protection for buried installations.
Stress-relief heat treatment for thick-walled shell and head sections per ASME code requirements.
Weld integrity verification across all shell, head, and nozzle welds before hydrostatic test.
Full-vessel pressure testing to design specification prior to dispatch.
Level, pressure, and temperature instrumentation supporting safe operation and inventory management.
Fabrication and safety features engineered to the NFPA 58 stationary LPG storage code alongside ASME pressure vessel requirements.
Bulk LPG and NGL storage at production, gathering, and processing facilities.
Feedstock and product storage for downstream petrochemical and chemical manufacturing operations.
Fuel storage supporting LPG and NGL-fired power generation facilities.
Bulk storage supporting marine terminal loading, unloading, and distribution operations.
Bulk storage feeding downstream cylinder-filling and distribution operations.
Aboveground and underground tanks serving industrial facilities and residential bulk propane supply.