Underground fuel tank installation guide (PEI RP100)

Underground tank installation quality is determined long before the excavation is covered. Design, manufacturer instructions, actual soil conditions and control of each stage must remain connected in one file. PEI RP100-22 (2022 edition) is a recommended practice used as a reference for installing underground storage systems; it does not replace approved drawings, manufacturer instructions or requirements from Panamanian authorities.

1. Freeze the design basis

Before mobilization, confirm each tank’s capacity, material and configuration; intended products; piping; secondary containment; detection; venting; overfill prevention; traffic over the slab; groundwater; drainage and existing utilities. Record each drawing revision and who authorized changes. If soil information or observed groundwater conflicts with the design, stop the affected stage and recalculate. A verbal field decision is not sufficient.

2. Receiving, storage and lifting

At delivery, compare the nameplate, order and drawings; document impacts, abrasions, fittings and plugs; and retain manufacturer instructions. Unloading and lifting should use the manufacturer’s intended points under a lift plan that controls capacity, radius and the work area. Figures from one RP100 edition or another tank model should not become universal rules: geometry, material and manufacturer determine the limits for the installed tank.

3. Excavation, bedding and water control

The excavation must allow work and compaction without damaging the system. Before entry, control stability, access, underground utilities, rain and groundwater. Bedding and backfill are accepted against the manufacturer’s specification and design, not merely a commercial material name. Record source, applicable grading or certificate, placed depths and stage photographs. This preserves evidence of work that will become inaccessible.

4. Buoyancy, anchoring and corrosion protection

The flotation calculation should address the design condition established by the responsible professional and the possibility of an empty tank. Slabs, straps, deadmen or other anchoring are installed to the drawings and manufacturer instructions without concentrating loads or damaging the shell. For metallic components, corrosion-protection systems and test points should be identified, accessible and verified. A component that is physically installed but lacks closeout continuity, isolation or measurement records remains open.

5. Piping, containment and monitoring

Routes, slopes, joints, penetrations and bend radii should be inspected before backfill. Sumps and spill buckets require sealing and access for inspection; see our guide to station containment components. Probes, sensors and the ATG console must match the documented configuration. Our ATG alarm guide explains why a system is useful only when its channels, labels and response workflow are configured.

6. Testing and hold points

The inspection plan defines what is checked at receiving, before lowering the tank, before concealing joints, before final backfill and before commissioning. Pressure, duration, test medium and acceptance criteria come from the manufacturer, design and applicable practice. Never improvise a pneumatic test: unsuitable pressure can create a severe hazard and damage equipment. The safety lead must authorize the method, isolation and exclusion area.

7. Closeout and the Panama procedure

The final file should include as-built drawings, nameplates, data sheets, stage photographs, approved changes, test results, initial monitoring configuration, warranties, training and open items. Panamá Digital identifies BCBRP/DINASEPI as the authority that inspects fuel-storage facilities. The PEI recommended-practices page helps identify the current RP100 edition; using it does not equal local approval.

Master Services can support planning, installation and documentation within a contracted scope. Designer, manufacturer, installer and authority retain different responsibilities. To organize a project, also review our fuel-station construction service and the Master University tanks learning path.

Frequently asked questions

Is PEI RP100 a Panamanian law?

It should not be presented as one. It is a recommended practice used as a reference. Contractual application and local requirements must be confirmed for the project.

Can backfill be changed in the field?

Only through a documented review against the manufacturer, design and soil conditions. An informal substitution can affect support, drainage and warranty.

Which evidence cannot be reconstructed later?

The condition of the excavation, bedding, anchors, penetrations, joints and backfill before concealment. Hold points and photographs are therefore essential.

Before covering a stage

Retain the current drawing, photographs and the relevant inspection or test record. Identify who reviews acceptance and list any open items. If soil conditions, equipment or design change, record the change before continuing.