IHRG
MSN-99-789 / Pb-Alloy Corrosion Study
Procedures / Identifier:
Revision:
Page: / Pb Procedures
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Area 100 Procedure 1 / Gas Injection System / Effective Date: / 11/1/99
1.PURPOSE
Set up the gas supply system to provide either inert, oxidation, and reduction gases. This procedure prepares the gas injection system for experimental operation by connecting gas cylinders and performing valve line-up.
2.SCOPE AND APPLICABILITY
To set up the gas injection system by trained operators. This procedure also covers addition and removal of gas bottles.
3.PREREQUISITES
3.1Set-up
3.1.1Purge gas can be supplied from either compressed gas cylinders or cryogenic tanks. Cryogenic tanks will only be used in the gas removal mode, no cryogenic fluids will be used.
3.1.2Ensure H2 concentration in inert matrix does not exceed 4 vol.% by verifying vendor packing slip. Keep this packing slip with project files.
3.1.3Ensure O2 concentration in inert matrix does not exceed 22 vol.%, by verifying vendor packing slip. Keep this packing slip with project files.
3.1.4Have wrenches to attach and remove gas regulators and gas lines.
3.1.5Operators must be current on gas cylinder training.
3.2The following PPE is on hand:
-safety glasses
-safety shoes
3.3The following cleaning supplies are on hand:
-wet wipes
-paper towels
-glass cleaner
4.INSTRUCTIONS
4.1Cylinder connection.
4.1.1Move gas cylinders to gas cylinder station in a cart.
4.1.2Secure gas cylinders to stand.
4.1.3Remove gas cylinder caps and wipe down the threads and seating surface of the regulator attachment point.
4.1.4Attach regulators to gas cylinders.
4.1.5Connect reducing gas (H2 or CH4) line to regulator.
4.1.6Connect oxidation agent (O2 or CO2) gas line to regulator.
4.1.7Verify the shut-off valve downstream of all regulators is shut.
4.1.8Crack open the cylinder valve and immediately shut the valve. Verify proper pressure response on the gas regulator gauges. If proper response is observed, then proceed. If not then fix leaks and/or replace regulators.
NOTE: Proper response is the regulator high pressure gauge indicates bottle pressure and low pressure gauge indicates a pressure. Also no leaking gas can be heard.
4.1.9Pressure check (to 8 psig) the regulator and supply gas line by putting in a plug and Snoop-ing the joints looking for bubbles. Tighten the fittings as necessary to stop any gas leaks. Then unplug the gas line.
4.1.10Shut cylinder valves.
4.1.11Back out regulators
The gas injection system is now operational for experiments.
4.2Gas bottle replacement.
4.2.1Shut the gas throttle valve.
4.2.2Shut the gas isolation valve.
4.2.3Shut the cylinder valve.
4.2.4Back out the regulator valve.
4.2.5Loosen the regulator fitting out of the bottle. Once pressure has been bled off, remove the regulator.
4.2.6Replace the bottle and return to step 4.1.
4.3Steady state operation.
NOTE: This sub-procedure assumes that steps in part 4.1 are completed and the GHT is ready to receive gas. Complete the following steps to establish gas flow in the corrosion cell.
4.3.1Slowly open the gas throttle valves to adjust gas flow in the corrosion cell. Use the gas calibration curves to establish desired gas flow per the experimental run plan.
4.3.2Adjust oxidation/reduction potential as necessary to control the oxidation layer in the corrosion cell.
5.RECORDS
5.1Record all changes in gas flow in the operator logs. Maintain the logs in the run file for the project.
5.2Keep the vendor receipts and gas specification sheet in the project file.
6.DEFINITIONS
6.1Regulator: Reduces bottle pressure (can be as high as 3000 psig) to a range of 0 to 150 psig.
6.2Crack: The very slight movement of a valve off its seat (or one turn of the threads) to check system response. If there is a large leak, the valve can be quickly closed.
6.3PPE: Personal Protective Equipment.
7.REFERENCES
7.1Gas Cylinder Training either SMJS992G or 000T2N41
7.2MCP-2728 Compressed Gas
7.3MCP-2715 Hazard Communication
7.4MCP-153 Industrial Hygiene Exposure Assessment
7.5MCP-2716 Personal Protective Equipment
7.6MCP-2707 Compatible Chemical Storage
7.7MCP-3449 Safety and Health Inspections