API STD 1529:2005 pdf download

API STD 1529:2005 pdf download.AVIATION FUELLING HOSE AND HOSE ASSEMBLIES.
4.4.5 Adhesion
The adhesion between the hose components shall be a minimum of 3 Newton/mm (17,1 pounds force/inch) of width for dry components and 2 Newton/mm (11,4 pounds force/inch) of width after contact with fuel.
4.4.6 Vacuum resistance
Type C and Type CT hose assemblies having internal
diameters of 63 mm (2,5 inches) or less shall withstand
a suction of 5 inches of mercury (2,5 psi) and retain
80 % of the original internal diameter when tested at
20 °C ± 5 °C (68 °F ± 9 °F).
Hose Type C and Type CT shall withstand a suction of 25,5 inches of mercury (12,5 pounds per square inch) for 10 minutes at 20 °C ± 5 °C (68 °F ± 9 °F) without suf’fering visual collapse of the tube, reinforcement, or outer cover. Hose Types E and F shall withstand a suction of 20 inches of mercury (10 pounds per square inch) for 10 minutes at 20 °C ± 5 °C (68 °F ±9 °F) and retain 80 % of the original internal diameter without suffering visual collapse of the tube, reinforcement, or outer cover.
4.4.7 Flexibility
The flexibility of the hose at 20 °C ± 5 °C (68 °F ±9 °F) shall be such that, when empty, it may be coiled around a test drum having an external diameter as specified in section 6.5.6 without suffering structural damage or kinking. After the hose is uncoiled, it shall show no signs of fatigue or permanent deformation (including length change) and, for Types C, CT and F hoses, no increase in electrical resistance outside the limits specified in 4.4.8.
The hose shall be flexible and retain pressure capabilities at temperatures ranging down to -30 °C ± I °C (-22 °F ± 2 °F) for normal hose and -40 °C
± I °C (-40 °F ± 2 °F) for CT hose. The manufacturer shall submit hose testing results indicating the maximum registered torque required to bend the hose around the test drum at a temperature of -30 °C (-22 °F) for normal hose and -40 °C (-40 °F) for CT hose. The test hose specimen shall be pre-conditioned in a cold chamber at the test temperature for 24 hours prior to testing. The test drum and specimen for hoses with inside diameters of 75 mm (3 inches) and smaller shall be kept in the cold box/bath during the test to ensure the test temperature is maintained. For hoses with inside diameters larger than 75 mm (3 inches), the test drum and specimen must be at the test temperature but may be removed from the cold box/bath for the test procedure. In this case the test must be initiated within 30 seconds of removal from the cold box/bath. The test drum must be rotated 180 degrees within a maximum time of 10 seconds. Test results shall be recorded in Newton-metres (N-rn) or foot-pounds force (lb-fl).
4.4.8 Electrical resistance
The electrical resistance for Types C. CT and F hoses shall be between 1 x i03 (minimum) to 1 x 10 (maximum) ohms/metre for an unpressurised hose after the proof pressure and flexibility tests.
The electrical resistance for Type E hose shall be not more than 100 ohms/metre.
Two electrical resistance tests shall be performed; one on the outer cover along the whole length of the hose and one to confirm continuity of the whole assembly.
4.4.9 Kink resistance
There shall be no observable permanent deformation or structural damage and no increase in electrical resistance outside the limits specified per 4.4.8 after the kink resistance test.
Note: When hose is bent at too sharp an angle it may kink and shorten the effective hose life, and any such kinking is not an acceptable or safe practice. The requirement for a kink resistance test is included to prevent potential problems with hose kinking in actual field use.
4.4.10 Fuel contamination
Fuel contamination shall not exceed 10 mg/l00 ml of test fluid (reference Fuel B, as described in ASTM D471).
4.4.11 Fuel discolouration
The colour of the effluent fuel following the fuel contamination test shall not be less than + 15 saybolt for normal hose and +10 saybolt for CT hose.
4.4.12 Ozone resistance
The cover material shall not show signs of cracking when subjected to the ozone test.
4.4.13 Concentricity
The concentricity shall not be more than I ,0 mm (0,039 inch). For hoses of spiral-wrapped construction (Type E) with inside diameters of 50 mm (2 inches) or more, the concentricity shall be no more than 1,5 mm (0,059 inch).