SERVICE AND SHELF LIFE OF SEV 44B EXPLOSIVE VALVE - IM99A
Abstract
The SEV 44B explosive valve is used to control the flow of ammonia from the IM99A nose cooling unit storage tank to the heat exchanger. The purpose of this test was to determine if the shelf and service life could be extended. The current shelf life and service life of the SEV 44B valve are 3 years and 2 years, respectively. Because of this limitation, it was necessary to replace these valves when this time was reached or to determine if their service life could be extended. Twenty-nine samples were tested. These specimens were visually inspected, radio graphed and temperature conditioned prior to testing. During testing, the valves were pressurized to 200 psig with nitrogen to simulate the pressure of the ammonia tank. All valves functioned satisfactorily. The minimum firing voltage (6.5 - 10 v) was well above specifi cation maximum no fire voltage of 3 v. The minimum operating current (0.27 - 0. 40 amps) was less than that called out by the specification (0.5 amp) but was within the calculated value. Demonstrated reliability was 90.2% at a confi dence limit of 95%. The valves were between 3.5 years and 4 years old when functioned. It is recommended that the service life of the SEV 44B valve be extended to four years and the shelf life to five years.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1963
- Accession Number
- AD0406768
Entities
People
- Don F. Woods
Organizations
- Ogden Air Logistics Complex