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LPG – LIQUIFIED PETROLEUM GAS SUPPLY CHAIN ENABLERS)

(LPG Process Flow Diagram - 1)

Refinery Distillation Tower

Refinery Distillation Tower

LPG Supply Chain – Schematic Diagram 1

FIGURE 1 – LPG DISTILLATION TOWER

VARIOUS LPG FILLING TANKS

FIGURE (2). VARIOUS LPG FILLING TANKS

CMechanical , Piping Design Basics, Piping Interface, Process Flow Diagram

Spherical or horizontal cylindrical type (bullet type) storage tanks are used to store LPG. The horizontal cylindrical types are usually used for small-capacity or underground installations and Spherical ones are used for higher capacities. The design of high-pressure LPG storage tanks is critical. Many parameters need to be considered during design. This article will provide basic information about the same.

Notes: Types of Pipes, Classification of Pipes made from Non-Ferrous materials. Pipe Class & Piping Specifications.

Types of Pipes | Classification of Pipes (PDF)

Selection of LPG Storage Tank Types

A tank type will usually be selected considering the cost or the size of transportation. The spherical type is usually employed for sizes greater than 500 m3. The horizontal cylindrical type is usually used for sizes smaller than 100 m3. Both types will be applicable for volumes ranging from 100 to 500 m3. The type of this capacity range will be decided by the total weight. Where the tank is installed underground, the horizontal type shall be selected, even if the vessel capacity exceeds 100 m3.

LPG Storage Capacity

Definition of Capacity

• Nominal capacity- All this capacity can be used, defined as below in the Name Plate Capacity Fig. 1. This capacity is usually used as a tank name
• Geometrical capacity- Volume inside a vessel which is called “a water volume” in NFPA.
• Storage capacity- The volume from the tank bottom to the maximum design level. This volume varies depending on the operating temperature.
• Net Working capacity- Volume between HLL and LLL or HHLL and LLLL

Fig. 2: Figure explaining the storage tank capacity

LPG Liquid Level

1) Maximum liquid level (maximum Storage Capacity)

Many countries specify a maximum LPG liquid level (max. storage capacity) in their regulations. In countries that have no such regulations, NFPA shall be applied. NFPA-58 and 59 specify details of the maximum liquid level including liquid volume correction factors and equations concerning capacity and temperature (Refer to NFPA 58 Para. 4-4 and Appendix-F)

(Notes: You can also view LPG Tanks, Nominal Capacity, Geometrical Capacity, Storage Capacity, Net Working Capacity . Video and Visual search images Websites/Internet)