Pressure vessel

A pressure vessel comprising:

• a center column defining a first inner volume and comprising a first part and a second part, wherein
• the first part comprises a first surface, and
• the second part comprises a second surface abutting and securing to the first surface;
• and
• a wall defining a second inner volume and encircling the center column, wherein the wall comprises a first segment and a second segment, wherein
• the first segment comprises a third surface, and
• the second segment comprises a fourth surface abutting and securing to the third surface, wherein the center column and the wall are formed of a polymeric material and are configured to maintain structural integrity when internal pressure exceeds external pressure such that the first inner volume and the second inner volume each retain shape and are each fixed.

A method of assembling a pressure vessel comprising:

• obtaining a body having a first end and a second end, the body comprising a center column defining a first inner volume extending between the first end and the second end, and a wall coupled to the center column, wherein the wall surrounds the center column and defines a second inner volume therebetween, and wherein the second inner volume is disposed annularly around, and fluidly separate from, the first inner volume, wherein the body is formed of a polymeric material and is configured to maintain structural integrity when internal pressure exceeds external pressure such that the first inner volume and the second inner volume each retain shape and are each fixed;
• coupling a first end cap to the center column at the first end to close off the first inner volume at the first end;
• and
• coupling a second end cap to the center column at the second end to close off the first inner volume at the second end.