ISO 23826:2021 certified valves can be incorporated in Hydrogen storage and transportation systems without compromising safety or performance over time.
The recently published October 2021, ISO 23826:2021 is a guideline for valve design, type testing, marking, manufacturing tests, and examination requirements for ball valves to be used for Hydrogen transportation as well as other gases.
As Hydrogen is evolving to be one of the main energy carriers of the near and distant future, there is a growing legal and regulatory need for transporting and storing Hydrogen in a safe manner.
Developers, designers, and operators of Hydrogen gas transportation and storage systems should be familiar with ISO 23826:2021 standard as one of the key considerations when selecting valves to be designed and used in these novel systems.
The new ball valve standard ISO 23826:2021 for gas cylinders covers ball valves in the function of:
With safe use and operation in mind, ISO 23826:2021 states tests protocols such as: mechanical strength, impact strength, burst pressure, endurance, external and internal leak tightness, flame impingement and visual examination to ensure valve integrity after having it undergo such rigorous testing.
When fitted, closed valves need to be internally leak tight during transport and storage at temperatures as low as -40°C (-40°F).
Ball valves used in liquefied gas service must have a cavity relief system (e.g., a vent through the ball) to prevent pressure accumulation within the ball cavity in the closed condition.
ISO 23826:2021 provide a few guidelines for materials selection when designing valves that perform at extreme cold temperatures and remind us to avoid brittleness-prone materials and to pay attention for materials compatibility with inline substances (gases).
Performing in so demanding applications, require rigorous testing to ensure valves resistance to hydraulic burst pressure to avoid deformation or rupture. The valves, according to ISO 23826:2021, should enable manual actuation for at least 2,000 cycles without sealing replacement at working temperatures and pressures – 1.2 times of the maximal working pressure, without aiding equipment and at acceptable torque values. Moreover, a hydraulic burst test is performed, using water and at a pressure of 2.25 times the maximal working pressure to ensure valves integrity even under extreme pressure conditions.
To comply with ISO 23826:2021 a ball valve must allow manual closing after exposure to flames, by hand or using a simple tool after cooling. Device actuated valves should either properly function or present a shut off mechanism after being exposed to flames.
In order to prevent an uncontrolled release of cylinder contents, every ball valve needs to offer a means to prevent inadvertent opening. This means the ball valve needs to have either a removable ball valve operating device or a locking mechanism.
• 2,000 Cycles test under 1.2 times the maximal working pressure (using Nitrogen, Helium, Hydrogen or inert mixture of these gases).
• Inline and Atmospheric leak test at -40°C (-40°F), -20°C (-4°F), 65°C (149°F) & ambient.
• Low pressure leak test.
• Sealing tested with Helium or Hydrogen media.
• Burst test under 2.25 times the maximal working pressure, with water.
• Flame impingement test.
• Excessive torque test.
HABONIM offers a full product line of ball valves to support the emerging Hydrogen-energy market. HABONIM offers Process-Ball-Valves for ultra-high pressures whilst the market traditionally uses instrumentation valves for ultra-high pressures.
HABONIM is 100%-ready with the most trusted high-end solutions for the Hydrogen world.
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