There are nine types of custom pressure vessel components manufacturing that have proved the best. These types are the ones most relied upon: 1. LONG WELD NECK “LWN”. The “LWN” connection is the least expensive and most lightweight FCI standard connection. 2. HEAVY BARREL “HB”. More reinforced than “LWN” with thicker barrel. 3. INTERMEDIATE BARREL “I”. There are 3 standard …