Downloaded from https://www.everyspec.com MIL-STD-2031(SH) b. A venting system at the top of the chiimbcr to enable reduction in pressure within the chamber d An inert gas (nitrogen) pressurization system to enable fire suppression when required e. Visual obscwation view ports to enable videotaping and test monitoring f. Instrumentation ports to provide feed-throughs for electric sensing and pressure measurements within the vessel A rupture disk assembly for Lhe chamber is recommended h. A chamber electronic control system, a gas sampling system, and closed-circuit television. 30.2 Liquid hd supply system.
A specialized liquid fuel supply system shall be used when available to provide for steady burning rates and measured fuel use rates. Such a system shall include an array of tapered-edge fire pans with various cross-seetional areas and a constant-level, liquid fuel supply system which allows the measure of fuel-loss (burning-rate) history. For test of materials a single mc=ured supply such as a S-gallon pan of sr-heptane shall be usd. 303 ‘llwrmocouplca. Temperatures in the chamber shall be monitored with ~+ arrays in each end of the chamber.
These thermocouples shall have chromel-alurnel wires with diameters of 0.2 mm and have ceramic insulation enclosed in 304 stainless steel jackets 1 mm in diameter. Thermocouple arrays for sensing temperatures in the vicinity of the test material application shall be included as required to properly record test results. 30.4 Radiometers. Wide and narrow angle radiometers installed on a tree stand shall be used to obtain radiation measurements in [he vicinity of the test material application. 30.5 Laser/detector sytem. A laser/deteetor system or systems shall be used to measure optical smoke density in various Ioeations and to correlate with the smoke particle analyzers.
30.6 Particle analyzer system. A filtration system shall be used to measure smoke particle mass concentration at 2 minute intervals. 30.7 Gas anntysis system. A continuous type gas analyzer system shall be used to monitor the eoneexnrations for 02, CO, and C02 A grab sampling system is used to eolleet and store for future analysis the concentr~tions for total hydrocarbons, 02, CO, C02, HCI, and HCN. 28