Tightening processes, specific cases
Figure 210
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Tightening processes, specific cases
Figure 211
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Tightening processes, specific cases
Figure 212
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ABAA
 
TUBES AND HOSES
MAINTENANCE PRACTICES
1. SERVICING
None
2. REMOVAL / INSTALLATION - TUBES AND HOSES (Figure 201 and Table 201)
A. Tools and consumable materials
- Blanking caps and plugs
- Red paint
- Clean lintfree cloths
- Cleaning agent (TB 11-003)
B. Typical removal of a tube or a hose
1) To prevent contamination, blank off all tubes and hoses and all fittings as soon as they are disconnected from the installation.
2) When several tubes / hoses are disconnected within the same work area, tag all the hoses / tubes to ease their identification during installation.
C. Typical installation of a hose
1) Prior to installation, visually inspect the hose and the fittings for cleanliness. A hose whose protective caps are missing must be thouroughly cleaned before it is installed.
2) Prior to installation, inspect for chafing and twisting marks and cracks.
3) Prior to installation, make sure the fittings are correctly aligned and fully tightened.
4) Do not lubricate the fittings unless otherwise specified.
5) Remove the old red paint marks.
6) Position the hose onto the fitting and tighten the nuts to the specified torque - refer to Table 201.
7) Hose assemblies installed on stationary fittings must not exhibit any twists once the securing nut is tightened. Hoses must not be over-tensioned or generate distortion of connected tubes when they are submitted to system maximum pressure.
8) Check that hose assemblies installed on moving fittings are not subject to twisting or tensile stresses within their entire travel range when they are submitted to system maximum pressure.
9) Check that the hose has enough slack to provide for changes in length and make sure it does not chafe against the structure. When the clearance between the hose and the structure is insufficient, a protection must be provided to prevent hose deterioration due to chafing.
　
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