Top Loading Arms


Top loading arms permit the transfer of liquid or liquefied gas from one tank to another through the manhole on the top of a road or rail tanker.

Depending on whether the product is ‘dangerous’ or not, this connection may be open (manhole not sealed), semi-closed (via a cone to the top of the tanker) or closed. A closed connection indicates that the product is dangerous or toxic and made by a flange to the top of the tanker, sometimes equipped with a cone and vapor hose to prevent the vapors from being released into the atmosphere.

When one is top loading, one will have to put operator safety as a number priority as the operator will be on top of the tanker.

Basic characteristics:

  • Nominal diameter: DN50-DN200 (2″-8″)
  • Pipeline material: carbon steel, stainless steel, aluminum, PTFE lined, heating tracing, etc
  • Product seal: PTFE or other material on request
  • Vapor cone seal: PTFE, nitrile rubber, EPDM, etc or other material on request
  • Balancing: Spring cylinder
  • Design pressure: -0.06Mpa-6.0Mpa
  • Design temperature: -196°C-300°C
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