Rev. Date:
30-Oct-96
Rev.:
C
Document No.
RayBlock 105
Sheet:
3 of 3
If this document is printed it becomes uncontrolled. Check for the latest revision.
Note 1: Pressure Test
Prepare 3 test assemblies, in accordance with the RayBlock 105 Installation Guidelines,
using cross-linked polyethylene wires about 12 inches long. After sufficient cooling time,
shrink one end of a 12-inch piece of Raychem TAT tubing around one end of the installed
RayBlock Tubing. Shrink the other end of the TAT around a pressurized air supply fitting.
Apply a pressure of 7.5 psi for 1 minute while submersing the assembly under water. After
the required time, bubbles of air emerging from the end of the RayBlock Tubing shall
constitute a failure. Bubbles emerging from the ends of the wires shall not constitute a
failure.
Note 2: Heat Aging
Prepare assemblies in accordance with Note 1, and hold in air circulating oven for the
required time. After allowing the assemblies to cool to room temperature for 2 hours, perform
the pressure test in accordance with Note 1.
Note 3: Low Temperature Impact
Prepare 3 test assemblies, in accordance with Note 1. Center each test assembly under a
falling weight impact tester located in a -40°C cold chamber. Drop a cylindrically shaped 2.2
pound weight, with a radius of 12 inches, on the face impacting the assembly, from a height
of 4 inches.
Note 4: Fluid Resistance
Prepare assemblies in accordance with Note 1. Immerse samples in the indicated fluids for
the prescribed time and temperature. Remove assemblies from the fluids. After allowing the
assemblies to cool to room temperature for 2 hours, perform the pressure test in accordance
with Note 1.
Note 5: Sequential Testing
Thermal Shock
Prepare 3 test assemblies, in accordance with Note 1 and subject them to 25 thermal cycles
as follows:
30 minutes at -40°C
30 minutes at 120°C
5 minutes maximum between temperatures
Mechanical Vibration
Attach the assemblies to a suitable vibrator and vibrate for a minimum of 24 hours in a simple
harmonic motion having an amplitude of 0.03 inch (0.06 inches total excursion) the frequency
being varied uniformly between the limits of 10 and 55 hertz (hz) reference: MIL-STD-202,
Method 201A. The axis of vibration shall be perpendicular to the axis of the assembly.
Assemblies are to be clamped 3 to 4 inches away from the end of the tubing on both sides of
the blocked wire bundle.
Temperature Humidity Cycling
Subject the assemblies to the following cycle five (5) times:
1) 95% relative humidity at 40 ± 3°C for 16 hours (hang assembly vertically)
2) -40 ± 3°C for 3 hours
3) 105 ± 3°C for 3 hours (hang assembly vertically)
4) 23 ± 3°C for 2 hours