Abstract: A fan wheel includes a hub having a passage extending along an axis, where the passage is configured to receive a shaft. The hub includes a first mounting surface positioned at a first location along the axis and a second mounting surface offset from the first mounting surface and positioned at a second location along the axis. The fan wheel also includes a fan blade having a first mounting tab and a second mounting tab, where first mounting tab is configured to engage with and couple to the first mounting surface and the second mounting tab is configured to engage with and couple to the second mounting surface.

Abstract: A fan wheel includes a hub having a passage extending along an axis, where the passage is configured to receive a shaft. The hub includes a first mounting surface positioned at a first location along the axis and a second mounting surface offset from the first mounting surface and positioned at a second location along the axis. The fan wheel also includes a fan blade having a first mounting tab and a second mounting tab, where first mounting tab is configured to engage with and couple to the first mounting surface and the second mounting tab is configured to engage with and couple to the second mounting surface.

Abstract: A system for exhausting hazardous stored energy from a pneumatic subsystem of a railcar, comprises: an air supply for delivering air to the pneumatic subsystem of the railcar; and an isolation valve interposed between the air supply and the pneumatic subsystem of the railcar. When the isolation valve is in a normal operating position, a supply port and a delivery port of the isolation valve are in fluid communication with one another, but when the sliding shoe is in the second position, the sliding shoe effectively closes access to the supply port, and the delivery port is in fluid communication with an exhaust port of the isolation valve. The isolation valve further includes a means for locking the sliding shoe in the second position.

Abstract: A method for monitoring the quality, stability, and potential deposition of process treatment fluids pumped into subsea umbilical systems includes monitoring a resonator sensor in the subsea umbilical system having a fluid flowing therethrough, where the resonator sensor can be a torsional resonator or a symmetrical sensor, and the method also includes detecting a change in resonance of the resonator sensor indicating the deposition of a chemical species on the resonator sensor or significant change in process treatment fluid physical viscosity and density properties. The resonator sensor can also measure the amount of chemical species deposited. The fluid may be an organic and/or aqueous based fluid. The method includes performing at least one action in response to detecting the change, which action prevents or inhibits blockage of the subsea umbilical system.

Abstract: A method for measuring chemical species deposition in a well, flow line, or processing equipment includes monitoring a resonator sensor in a well, flow line, or processing equipment having a fluid flowing therethrough, where the resonator sensor can be a torsional resonator or a symmetrical sensor, and the method also includes detecting a change in resonance of the resonator sensor indicating the deposition of a chemical species on the resonator sensor. The resonator sensor can also measure the amount of chemical species deposited. The fluid may be an organic and/or aqueous fluid that comprises petroleum and/or produced water and the deposition chemical species include, but are not necessarily limited to, asphaltenes, wax, scale, gas hydrates, naphthenic acid salts, and combinations thereof.

Abstract: A petroleum-based fluid sample may be centrifuged in a centrifuge vial where a light may be passed through the petroleum-based fluid sample to identify an amount of transmitted light at two or more time intervals. The stability of the foulant(s) and/or efficacy of the foulant inhibitors to prevent the destabilization of the foulants may be determined by comparing a change in the amounts of transmitted light through the petroleum-based fluid sample. The petroleum-based fluid sample may include a petroleum-based fluid, at least one foulant, and an optional additive for destabilizing the foulant(s). The additive may be or include a first component, such as but not limited to n-alkanes, iso-alkanes, alkenes, alkynes, cyclo-alkanes, natural gas, natural gas condensate, alcohols, ethers, ketones, organic acids, acetates, carbon dioxide, and combinations thereof.

Abstract: A petroleum-based fluid sample may be centrifuged in a centrifuge vial where a light may be passed through the petroleum-based fluid sample to identify an amount of transmitted light at two or more time intervals. The stability of the foulant(s) and/or efficacy of the foulant inhibitors to prevent the destabilization of the foulants may be determined by comparing a change in the amounts of transmitted light through the petroleum-based fluid sample. The petroleum-based fluid sample may include a petroleum-based fluid, at least one foulant, and an optional additive for destabilizing the foulant(s). The additive may be or include a first component, such as but not limited to n-alkanes, iso-alkanes, alkenes, alkynes, cyclo-alkanes, natural gas, natural gas condensate, alcohols, ethers, ketones, organic acids, acetates, carbon dioxide, and combinations thereof.

Abstract: Disclosed are paraffin inhibitors prepared by admixing a polymer having the characteristic of inhibiting paraffin crystalline growth in formation fluid from oil and gas wells with a first solvent selected from the weak to moderate wax solvents and a second solvent selected from the strong wax solvents. Exemplary weak to moderate wax solvents include benzene, toluene, xylene, ethyl benzene, propyl benzene, trimethyl benzene and mixtures thereof. Exemplary strong wax solvents include cyclopentane, cyclohexane, carbon disulfide, decalin and mixtures thereof. The solvent system disclosed has desirably better solubility with the polymers, even at reduced temperatures, than either solvent alone. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will be used to interpret or limit the scope or meaning of the claims.

Abstract: Disclosed are paraffin inhibitors prepared by admixing a polymer having the characteristic of inhibiting paraffin crystalline growth in formation fluid from oil and gas wells with a first solvent selected from the weak to moderate wax solvents and a second solvent selected from the strong wax solvents. Exemplary weak to moderate wax solvents include benzene, toluene, xylene, ethyl benzene, propyl benzene, trimethyl benzene and mixtures thereof. Exemplary strong wax solvents include cyclopentane, cyclohexane, carbon disulfide, decalin and mixtures thereof. The solvent system disclosed has desirably better solubility with the polymers, even at reduced temperatures, than either solvent alone.

Abstract: A concrete construction system enabling the construction of multi-storey buildings using single storey wall panels and elevated flat slabs is provided. The invention provides a plurality of concrete panels of a uniform thickness, the plurality of concrete panels including wall and floor panels, wherein the floor panels are interconnected with abutting floor panels with a tongue and channel system so as to properly support the floor panels on the supporting wall.