After grounding and bonding, what should an ohmmeter read during preparation for tank transfer?

When preparing for tank transfer operations involving flammable or hazardous materials, grounding and bonding are critical safety steps to prevent static discharge. The correct reading on an ohmmeter after completing these steps should ideally indicate a resistance of 25 ohms or less. This low resistance means that any static electricity generated can safely dissipate to ground without accumulating to a level that could create a spark or ignition source.

The rationale behind this specific threshold—25 ohms or less—is grounded in ensuring a safe environment during the transfer of volatile substances. This ensures both the equipment and personnel are adequately protected from the risks associated with static electricity, which can ignite flammable vapors.

Having a reading higher than 25 ohms increases the risk of static discharge, making it less safe for performing transfers of hazardous materials. Regulations and guidelines established for hazardous material handling emphasize maintaining readings ideally at or below this benchmark to ensure a controlled and safe operation.