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Scuba Tank VIP & Hydro Reminder – Annual & 5‑Year Schedule

Diving Safety inspection scuba tank
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Scuba Tank VIP & Hydro Reminder

Track annual Visual Inspections (VIP) and 5‑year Hydrostatic Tests (Hydro) for all your scuba cylinders. Stay compliant with DOT standards.

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Frequently Asked Questions
What is a scuba tank VIP (Visual Inspection)?

A Visual Inspection (VIP) is an annual internal and external examination of a scuba cylinder performed by a trained technician. The inspector checks for corrosion, pitting, cracks, and other damage using a bright light and sometimes a borescope. A VIP sticker is placed on the tank with the inspection date. Most dive shops and fill stations require a current VIP sticker (within 12 months) before they will fill your tank.

What is a Hydrostatic Test (Hydro)?

A hydrostatic test is a DOT-mandated pressure test performed every 5 years. The cylinder is filled with water and pressurized to 5/3 of its working pressure inside a sealed chamber. The test measures permanent expansion of the cylinder walls. If the tank expands beyond allowable limits, it fails and must be condemned. Only DOT-authorized testing facilities can perform hydro tests. After passing, the test date is stamped into the tank's crown.

How often do scuba tanks need VIP and Hydro testing?

VIP: Required every 12 months (annually). Hydro: Required every 5 years per DOT regulations (49 CFR 180.205). Some special tanks or those used in commercial diving may require hydro every 3 years. Always check local regulations. If a tank sits empty for over 3 months, a new VIP is typically recommended before filling.

What is the difference between VIP and Hydro testing?

VIP is a visual check done annually at any dive shop—it's quick (15–20 minutes) and inexpensive ($15–$30). Hydro is a pressure test done every 5 years at specialized facilities—it takes several days and costs more ($40–$75+). VIP inspects for visible damage; Hydro verifies the structural integrity of the metal under extreme pressure. Both are essential for safe diving.

What happens if my scuba tank VIP or Hydro is overdue?

If your VIP is expired, most reputable dive shops and fill stations will refuse to fill your tank until a new inspection is completed. If your Hydro is expired, the tank is legally out of compliance with DOT regulations and cannot be transported or filled commercially. Using an overdue tank poses safety risks including catastrophic failure under pressure. Always maintain current inspections.

What are the DOT requirements for scuba tank hydro testing?

The U.S. Department of Transportation (DOT) under 49 CFR 180.205 requires that all compressed gas cylinders (including scuba tanks) undergo hydrostatic testing every 5 years. The test must be performed by a DOT-licensed retest facility. Tanks manufactured under DOT 3AL, 3AA, or E-series specifications all follow this 5-year cycle. Some special permit cylinders (e.g., SP 14157) may have different requirements.

Can I get my scuba tank filled without a current VIP or Hydro?

No. Dive shops and fill stations are legally and ethically bound to verify that tanks have a current VIP (within 12 months) and valid Hydro (within 5 years) before filling. This protects both the operator and the diver. Attempting to bypass these requirements is dangerous and could result in serious injury or death from tank failure.

How much do VIP and Hydro tests cost?

A VIP typically costs $15–$30 and takes about 15–30 minutes at most dive shops (sometimes free with an air fill package). A Hydrostatic test costs $40–$75+ and may take 3–10 business days depending on the facility. Some dive shops offer combined VIP + Hydro + fill packages for convenience. Prices vary by region and tank size.

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