MIL-STD-2042-2B(SH)
NOTE: Before assembling the tube coupler onto the tube, clean the end of each BOF tube with a wipe dampened with alcohol and blow dry as necessary.
NOTE: Refer to the connection chart or other approved drawing to determine where to use straight tube couplers and where to use tee tube couplers.
NOTE: When a tee tube coupler is used, the tee connection is end sealed in accordance with Method 2J1 of this standard after conduct of the tube sealing integrity test.
Step 9 - For all locations where a tee tube coupler is used, one of the following optional steps may be performed:
option a. Using the tube cutter, cut a short piece of BOF tubing (length as necessary to allow easy access). Visually verify that the ends
of the tube are cut perpendicular to the tube length. Clean the ends of the BOF tube with a wipe dampened with alcohol and blow dry as necessary. Slide the short tube into the tee position of the tee tube coupler. Firmly seat the short BOF tube into the tee tube coupler. Apply an axial load of approximately 22 N (5
lbs) between the BOF tube and the tee tube coupler to verify that it is properly engaged into the tube coupler.
option b. Clean the pressure valve assembly with a wipe dampened with alcohol and blow dry as necessary. Slide the pressure valve assembly into the tee position of the tee tube coupler. Firmly seat the pressure valve assembly into the tee tube coupler. Apply an axial load of approximately 22 N (5 lbs) between the pressure valve assembly and the tee tube coupler to verify that it is properly engaged into the tube coupler.
option c. Clean a tube fitting plug with a wipe dampened with alcohol and blow dry as necessary. Slide the tube fitting plug into the tee position of the tee tube coupler. Apply an axial load of approximately 22 N (5 lbs) between the tube fitting plug and the tee tube coupler to verify that it is properly engaged into the tube coupler.
Step 10 -Identify two BOF tubes to be interconnected, plan the path of the interconnecting jumper tube (see figure 2I1-2), and determine the length of the required jumper tube. Using the tube cutter, cut a piece of BOF tubing to the required length. Visually verify that the end of the tube is cut perpendicular to the tube length. Clean each end of the BOF tube with a wipe dampened with alcohol and blow dry as necessary.
NOTE: The path of the jumper tube should follow the exterior of the tube routing box to the greatest extent possible.
NOTE: When the two tubes to be interconnected are located on the same side of the tube routing box, a figure-eight type of path should be used (see figure 2I1-2).
Step 11 -CAUTION: Do not exceed a bend diameter of 13 cm (5 in) for the BOF
tubes. BOF tubes may collapse at diameters less than 13 cm (5 in).
Form the jumper tube along the planned path. Slide the jumper tube into the tube coupler of each of the two BOF tubes to be interconnected. Firmly seat the jumper tube into each tube coupler. Apply an axial load of approximately 22 N (5 lbs) between the BOF tubes and the jumper tube to verify that they are properly engaged into the tube couplers. Secure the jumper tube to the box mounting brackets (if available) using self-clinching straps.
2I1-4 METHOD 2I1
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