Many thanks to Paul Stahl Jr, for sending us this modification manual for the C-109 fuel transport, an modified verison of the B-24 bomber. His father, Paul Stahl Sr, was the project engineer for the C-109.
Consolidated C-109 Gallery
Page 8 - Section 3 - Installation Vapor Dilution System C-109 Tanker & Section 4 - Oxygen System C-109 Tanker
INSTALLATION VAPOR DILUTION SYSTEM C-109 TANKER
A bottle rack containing four CO2 bottles is installed under the flight deck between Stations 3.0 and 3.2, left-hand side. These bottles are tubed so as to discharge through 4 discharge ports installed betwteen Stations 3.0 and 3.1, left-hand side. The release handles for the CO2 bottles are installed just aft of Station 3.0 on the flight deck floor, left-hand side. Through a series of cables and corner poles the release handles are connected to the bottles. The 1.4 pound cylinder is connected through a series of 5/16" tubing to the nose tank. The 5.0 pound cylinder is connected through 5/16" tubing to the 3 tnks on the command deck. One 9.5 pound cylinder is connected through 5/16" tubing to both forward bomb bay tanks. Each bottle has a pressure regulator installed between the bottles and respective tanks.
Generally speaking, the CO2 system should only be operated when the cargo tanks are empty; usually on the return trip of the airplane.
Since the above system is a ONE TIME system, that is, the complete contents of a bottle will be used with one pull of the release handle; it is recommended that once the tanks are filled with CO2 vapors, the airplane be flown at a CONSTANT ALTUTIDE. By flying at a constant altitude "breathing" of the tanks is minimized, thereby, assuring maximum effectiveness of the system.
OXYGEN SYSTEM C-109 TANKER
All but 10 of the G-1 oxygen bottles are removed from the B-24 Airplane. 3 of these bottles are left installed in the Sperry Ball Turret Well. 3 are left installed on the stringers overhead of the turret. The remaining 4 bottles are left installed in and around the waist gunner's compartment. All but 4 of the oxygen outlet stations are deleted from the airplane. The stations remaining installed are pilot, co-pilot, left-hand radio and right-hand radio compartments. The pilot and co-pilot's panel are supplied by a 3 line system, while the left and right-hand radio panels are supplied by a 2 line system. The pilot and co-pilot are allotted approximately 3 bottles apiece. The left and right-hand radio stations are allotted approximately 2 bottles apiece. The system is filled through a filler valve in the Sperry Ball Turret Well at approximately Station 6.2. There are no shut-off valves or single line check valves installed in this sytem. The left and right-hand radio panels have a style "D" check valve installed and the pilot and co-pilot's panels have a style "E" check valve instlled. The tubing is clipped approximately 15", using Adel clips.