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Gas bottles are stored on racks, usually eight (8) bottles of the same gas on one metal rack. If it can’t be avoided bottles filled with different gases are on one rack. The gas bottles are strapped to the rack with metal banding. The racks get shipped back and forth between shore and ship, usually to have them refilled, when empty, and/or pressure tested every 5 years. The shipment from SHORE to SHIP is a HAZARDOUS SHIPMENT because the gases are under 22 psi pressure, from SHIP to SHORE they are a regular shipment because they are empty.
In AMS, gas bottles assigned to a rack as well as single gas bottle information can be checked/edit under Shipping/Gas Bottle (top row item).
This document summarizes all necessary steps as well as knowledge that was acquired over time.
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The gas bottle cylinders have to be hydro tested (pressure tested) every 5 years. The hydrostatic test date will be stamped into the collar of the cylinder (for more information, see SAFETY paragraph).
AMS/warehousing process to refill gas cylinders that are used on the ship:
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How do I know if a gas rack is in the shipment back to shore?
Also:
Hydro testing
Numbering racks
Ensuring that in AMS the GR number correctly reflects the GB numbers