Underground Propane Tank in Puerto Rico

What is an underground propane tank, and is it a good option for your property in Puerto Rico? An underground propane tank is a specially coated ASME pressure vessel buried below grade, with only a dome collar and service valve cover visible at the surface. Underground tanks offer a clean, hidden installation that preserves the visual appearance of the property while providing the same reliable propane supply as an aboveground tank. This guide explains underground propane tank options, installation requirements, pros and cons, and code requirements for Puerto Rico properties.

For underground propane tank service in Puerto Rico, call Tropigas at 787-641-8002.

What Is an Underground Propane Tank

An underground propane tank is an ASME-certified steel pressure vessel specially coated for below-grade installation to resist corrosion from soil contact. It is buried in an excavated pit with a concrete dome collar extending to grade level, providing access to the service valve, regulator, and gauge. From the surface, only the dome collar is visible, making underground tanks the most discreet propane storage option.

Underground tanks are available in sizes from 250 gallons to 1000 gallons and are common in residential and light commercial properties where aesthetics matter. Call 787-641-8002 to discuss underground tank options for your property.

Advantages of Underground Propane Tanks

Underground propane tanks offer several advantages over aboveground installations: no visible tank on the property preserving curb appeal, protection from temperature extremes (soil provides insulation), protection from vehicle impact and physical damage, no clearance conflicts with landscaping or structures in the same way as aboveground tanks, and no tank maintenance concerns related to exterior weathering.

For properties where appearance matters, an underground tank eliminates the visual presence of a large aboveground cylinder. Call 787-641-8002 to discuss whether underground is right for your property.

Disadvantages of Underground Propane Tanks

Underground propane tanks also come with disadvantages that property owners should consider: higher installation cost due to excavation, concrete work, and cathodic protection requirements, more complex inspection procedures requiring specialized equipment, cathodic protection system that must be maintained and tested periodically, more difficult and expensive relocation if property needs change, and any leak detection requires specialized equipment since the tank is not visible.

Underground tanks are not right for every property. Call 787-641-8002 for a full assessment.

Underground Tank Installation Requirements

Installing an underground propane tank in Puerto Rico requires compliance with NFPA 58 and the Puerto Rico Fuel Gas Code 2018, plus additional requirements specific to underground installations. Requirements include a properly excavated pit with adequate depth and clearance, an ASME tank rated for underground service with factory-applied corrosion-resistant coating, a cathodic protection system to prevent electrochemical corrosion, a concrete dome collar at grade level, gas piping from the dome to appliances installed in a protective conduit, NTSP authorization before installation, and inspection and certification before first fill.

Call 787-641-8002 for underground tank installation guidance.

Underground vs Aboveground Comparison

The choice between underground and aboveground depends on your priorities. Aboveground tanks are less expensive to install, easier to inspect, simpler to relocate, and easier to monitor for leaks. Underground tanks are more discreet, better protected from physical damage, and eliminate the visual impact of a tank on the property. For most residential properties in Puerto Rico, aboveground tanks are the practical choice. Underground tanks are best for properties where appearance is a primary concern and the higher installation cost is acceptable.

Call 787-641-8002 to discuss which option is right for your property.

NFPA 58 Requirements for Underground Tanks

NFPA 58 establishes specific clearance requirements for underground propane tanks that differ from aboveground requirements. Underground tanks must be buried with a minimum of 6 inches of compacted earth or sand cover over the top of the tank. The dome collar must be at grade level and accessible. The tank must not be installed under a building or structure. The fill connection must be accessible to the delivery truck. Cathodic protection must meet applicable standards and be tested periodically.

All underground installations must be approved by the NTSP before the first fill. Call 787-641-8002.