Valves lining

Piping, valves, lines, particularly in cold weather (below 40°F/5°C approx.)... 

The vapor vent valves are connected to the tank vapor control valve, and ultimately to the carbon canister by tubing that is resistant to swelling in the presence of fuel vapors. The tubing material must also have a low HC permeation rate, so that the evaporative emissions are not increased due to release of HC molecules. The tank vapor control valve connects the carbon canister to two fuel tank vapor sources the vapor vent valve lines and a refueling vent tube. 

Interactions refers to any jobs, tasks, or operations carried out by people who could directly or indirectly cause the hazard to be released. Direct interactions with the plant might involve breaking open pipework, opening reactors, etc. Indirect interactions would include remote activation of valves from a control room, or the performance of maintenance on critical plant items. Errors that might occur during these interactions could allow the harm potential to be released. This could occur directly (for example, a worker could be overcome by a chlorine release if an incorrect valve line-up was made) or indirectly (for example, if a pump bearing in a critical cooling circuit was not lubricated, as in the example in Chapter 1). The procedure as described above... 

Liquid polyhydric alcohol from supply tank 11 via valved line 12 is fed through metering pump 13 in predetermined proportions via line 14 to tubular reactor 15. Simultaneously, ni-... 

Control diagrams should be drawn in P ID format and should show all coil piping, including all valves, line numbers, and so on. A separate P ID should be developed for each air-handling unit and should show all devices individually. Control diagrams should supplemented with sequences of operation either on the drawing or as part of the specifications. Control diagrams should include a control valve schedule that supplies the size and specifications for each valve. 

Pacification is a technique for removing organics and buffers from HPLC metal and Teflon surfaces and protecting them from salt corrosion with 6 N nitric acid (see Chapter 4). First, remove the HPLC column and replace it with a column bridge. Do not flush this wash into the mass spectrometer. Wash the system with water. Remove the column and replace it with a column blank. Flush with 6 N nitric acid for at least 30min, then overnight with water. Ensure the effluent pH is back to that of lab water. Replace the column and flush with mobile phase. This should be done at least once a month to clean check valves, line, and injectors. Under no circumstances should this wash be done with an HPLC column in place or into the mass spectrometer ... 

Tenax TA (Chrompack, Bridgewater, NJ). The trap was preheated at 175 C and then desorbed at 180 C for 4 min. The trap was baked at 225 C for 10 min. between runs. All valve lines and sampler mounts were continuously heated to 100 C. The Capillary Interface was cooled with liquid nitrogen for cryotrapping the desorbed sample and heated for 10 seconds for GC injection. 

The sample to be loaded onto the HPLC system must be free of the particulates susceptible to clog its valves, lines, and columns. The particulates may be removed either by filtration with 0.22-0.45-pm membrane or by centrifugation. Yeast crude cell lysate solution can be difficult to filter due to the presence of glass beads so centrifugation is the method of choice. 

Relief valve lines too small to relieve pressure fast enough This is in effect a single point of failure for the emergency relief system... 

Soft rubber is used for cable insulation, flexible hose, shock ab> sorbers, as a gasket material, and as a lining for iron and steel vessels and pipelines. When used as a lining, rubber is applied to the vessel with a special adhesive. Hard ebonites may be used for pump or valve linings and, without metal support, for smaller vessels. 

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