Completed gas system, including pressure vessel, shall be pneumatically tested in place using a remote test  system comprising a gas cyl., regulator, gauge, test valve, and vent valve. The test system and operator shall be located a minimum of 8 ft. from the main pressure vessel, with no line of sight to system (behind a barrier; this can be a room wall or the existing wall of cabinets and workbenches presently on 70A-2263). This test will be done with pressure vessel set to an MAWP of 350  psig (250 initial). Test as follows:
	1. Procure:
		a. Gas cylinder of clean Ar, N2, CO2, or dry air with supply pressure above 2000 psig. 
		b. Calibrated test gauge(s) for reading 438 psig (313 initial),  563 psig, and 1875 psig to within 5% accuracy. Gauge maximum scale pressure should not be less that 1.2x or more than 4x the test pressure. Electronic gauges (calibrated) are permissible, and are not subject to the above range limitations.
		c. Regulator(s),  to provide above pressures in (b) to fit cyl. in (a).
		d. 10 ft. long high pressure clean gas service (e.g. McMaster P/N 5665K34 2-3 ea) or PTFE lined high pressure chemical hose (e.g McMaster P/N 5830K21,  or similar), 2000 psig rated (min.), and fittings to connect to gas system at T1, T3.
		e. Pressure relief valves set to 438 psig (313 initial), 563 psig, and 1875 psig (on calibrated gauge), to fit exhaust ports of  350 psig (250 initial), 450 psig, and 1500 psig relief valves. 
		f. Test pressure isolation valve, and fill vent valve rated for test gas maximum pressure.
		g. Test pressure release vent valve on Tee, both rated for test gas maximum pressure.
	2. Assemble remote gas cylinder/regulator(RT)/test gauge(GT)(for 563 psig test)/ test isolation valve(TV) /vent valve(VV)/fill vent valve (VF) as shown in fig. 17 below and locate around corner from experiment, out of line sight, and behind wall of cabinets. Survey for and remove any hazardous material (such as radioactive sources, flammable liquids, glassware, etc.) from line of sight to test area. Have fire extinguishers on hand. Note that the pressure relief valve shown in fig. 17 is optional, since test feed ports T1 and T3 cannot be isolated from the system pressure relief valves.	
	3. Install  438 psig (313 initial), 563 psig, and 1875 psig relief valves into exhaust ports of 350 psig (250initial), 450 psig , and 1500 psig relief valves, respectively.
	4. Check that gas system is depressurized,  then remove T1 plug and install hose end. 
	5. Barricade test area to prevent personnel ingress, notify building manager of impending test.  Clear area of all people except for pressure test operator and witness(es).
	7. We start by testing 450 psig MAWP subsystem as follows:
	8. Check that installed test gauge, GT, and regulator, RT,  are for 563 psig test pressure.
	9. Open valves V4-V9. Close valves V3, V11, V12, V16, V17. 
	10. Back off RT handle fully. 
	11. Open test gas cyl. valve 1-2 turns. 
	12. Screw in RT handle slowly, in steps of 20% MAWP, each time closing VT, and watching GT to see that stable pressures are achieved. Watch GT for 5 minutes minimum, each time. If leaks occur, back off pressure to 90 psig (20% MAWP) max. and inspect to find leak. See note on possible methods below fig. 17. Once found, back off RT fully, open test vent valve VV to depressurize fully, and fix leak. If no leaks occur, continue increasing pressure until 450 psi reads on GT. Record pressures on system gauges. If gas system pressure gauges cannot read higher than 450 psig, then hold for 5 minutes, then back off regulator, close test gas cyl. valve and release system pressure. Remove system gauges, plug and repressurize to 563 psig, as above.  Hold for 5 minutes, then back off regulator fully, close test gas cyl. valve, and release system pressure through VV. Replace gas system gauges, if removed. Note that it may be possible to tell when 450 psig relief valve opens, however this should not be regarded as accurate since 450 psig relief valve could leak during test. 
	13. Remove 563 psig relief valve from exhaust port of 450 psig relief valve.
	14. Close VV, and progressively repressurize system until 450 psig relief valve exhausts, but not past 475 psig. Depressurize  and vent pressure.  Adjust relief valve if needed and repeat test.
	15. Proceed to test main pressure vessel as follows:
	16. Open valves V11, V12, V13. Leave V4-V9 open. Close valves V10, V14, V15. Leave valves V3,     V16, V17 closed.
	17. Back off RT knob fully. 
	18. Open test gas cyl. valve 1-2 turns. 
	19. Screw in test regulator slowly, in steps of 20% MAWP, each time closing VT, and watching GT, to see that stable pressures are achieved. Watch GT for 5 minutes minimum, each time. If leaks occur, back off pressure to 50 psig (20% MAWP) max. and inspect to find leak. See note on possible methods below fig. 17. Once found, back off  RT fully, open  VV to depressurize fully, and fix leak. If no leaks occur, continue increasing pressure until 450 psi reads on GT. Record pressures on system gauges. If gas system pressure gauges cannot read higher than 450 psi, then hold for 5 minutes, then back off regulator, close test gas cyl. valve and release system pressure. Remove system gauges,plug and repressurize to 438 psig (313 initial) as above. Hold for 5 minutes, then back off regulator, close test gas cyl. valve and release system pressure. Replace gas system gauges, if removed. Note that it may be possible to tell when 350 (250 initial) psig relief valve opens, however this should not be regarded as accurate, since 350 (250 initial) psig relief valve could leak during test. 
	20. Remove 438 (313 initial) psig relief valve from exhaust port of 350 (250 initial) psig relief valve.
	21. Close VV, and progressively repressurize system until 350 (250 initial) psig relief valve exhausts, but not past 380 (275 initial) psig. Depressurize and vent pressure.  Adjust relief valve if needed and repeat test.
	22. Remove hose from T1, replace plug.
	23. Test 1500 psig MAWP  subsystem as follows:
	24. Change test gauge to 1875 psig gauge, if needed.  
	25. Unplug T3 and install test hose.
	26. Open valve V14. Close valve V13. Leave V15 closed. Screw in R3 all the way.
	27. Back off test gas cyl. regulator knob fully. 
	28. Open test gas cyl. valve 1-2 turns. 
	29. Screw in test regulator slowly, in steps in steps of 20% MAWP, each time closing VT, and watching GT to see that stable pressures are achieved. Watch GT for 5 minutes minimum, each time. If leaks occur, back off pressure to 300 psig (20% MAWP) max. and inspect to find leak. See note on possible methods below fig. 17. Once found, back off RT fully, open VV to depressurize fully, and fix leak. If no leaks occur, continue increasing pressure until 1500 psig reads on test gauge. Record pressures on system gauges. If gas system pressure gauges cannot read higher than 1500 psig, then hold for 5 minutes, then back off regulator, close test gas cyl. valve and release system pressure. Remove system gauges, plug and repressurize to 1875 psig as above. Hold for 5 minutes, then back off RT, close test gas cyl. valve and release system pressure. Replace gas system gauges, if removed. Note that it may be possible to tell when 1500 psig relief valve opens, however this should not be regarded as accurate since 1500 psig relief valve could leak during test. 
	30. Remove 1875 psig relief valve from exhaust port of 1500 psig relief valve.
	31. Close VV , and progressively repressurize system until relief valve exhausts, but not past 1600 psig. Depressurize and vent pressure. Adjust relief valve if needed and repeat test.
	32. Remove hose from T3, replace plug.
	33. Attach pressure test tags to pressure relief valves.