Portable apparatus and method for venting a storage vessel

A method for venting vapors from a storage vessel, comprising the steps of:

• (i) connecting a fill line to a liquid storage vessel containing volatile organic vapors;
• (ii) connecting a vapor recovery line to said vessel
• (iii) releasing a gas into said fill line;
• (iv) heating said gas in said fill line;
• (v) reducing the pressure on said gas in said fill line to a predetermined pressure;
• (vi) introducing said gas in said fill line at a controlled flow rate and temperature to said
• vessel to establish a uniform interface between said gas and said vapors in said vessel;
• and
• (vii) displacing said vapors into said vapor recovery line.

Apparatus for venting volatile organic vapors from a liquid storage vessel, comprising:

• (i) a fill line;
• (ii) a vapor recovery line;
• (iii) a purge medium to displace volatile organic vapors from a liquid storage vessel and into said vapor recovery line;
• and
• (iv) means for introducing said purge medium to said liquid storage vessel through said fill line at a predetermined pressure, and at a controlled flow rate and temperature to maintain a substantially laminar flow of said purge medium and establish a stratification between said volatile organic vapors and said purge medium.

Apparatus for venting vapors from a storage vessel, comprising:

• (i) a fill line;
• (ii) a vapor recovery line;
• (iii) means for releasing a purge medium into said fill line;
• (iv) means for heating said purge medium in said fill line;
• (v) means for reducing the pressure on said purge medium in said fill line to a predetermined pressure;
• and
• (vi) means for introducing said purge medium in said fill line at a desired temperature and pressure into a liquid storage vessel containing vapors to establish a uniform interface between said purge medium and said vapors.