Abstract: A method and system are disclosed for providing electrical power from a utility electric grid to a fracturing operation, and an electrically powered fracturing system. A mobile substation includes at least two transformer units that are operatively coupled to the utility electric grid in a parallel orientation, wherein the transformer units are capable of receiving power from the utility electric grid and stepping down the power for delivery to a switchgear. An electric motor is operatively coupled to a hydraulic fracturing pump and operatively controlled by a variable frequency drive. At least one open air relay cable is operatively coupled between the switchgear and the electric motor and capable of delivering power to the electric motor.

Abstract: Apparatus for cleaning a tank's inner side includes a tank-mountable frame, a frame-mounted support drivable with respect to the frame about a first rotation axis, a support-mounted nozzle drivable with respect to the support about a second rotation axis transverse to the first axis. The nozzle's spraying direction faces away from the second axis. A controller of the apparatus drives the support and the nozzle, such that the nozzle is rotated about the second axis alternatingly from a start position to a stop position by a predefined cleaning angle smaller than one revolution and from the stop position to the start position. The nozzle angular velocity with respect to the support is smaller than the support angular velocity with respect to the frame within the cleaning angle and smaller than the nozzle angular velocity with respect to the support during movement from the stop position to the leaning start position.

Abstract: A method and system are disclosed for providing electrical power from a utility electric grid to a fracturing operation, and an electrically powered fracturing system. A mobile substation includes at least two transformer units that are operatively coupled to the utility electric grid in a parallel orientation, wherein the transformer units are capable of receiving power from the utility electric grid and stepping down the power for delivery to a switchgear. An electric motor is operatively coupled to a hydraulic fracturing pump and operatively controlled by a variable frequency drive. At least one open air relay cable is operatively coupled between the switchgear and the electric motor and capable of delivering power to the electric motor.

Abstract: A method of inspecting a label attached to a food pack comprising: determining the location of a plurality of target portions of the label; inspecting the target portions to identify at least the presence of text and/or graphic information within each target portion; and determining whether or not each target portion successfully compares with corresponding predetermined criteria; and determining that the label is unacceptable if the total number of successful comparisons is below a predetermined acceptance threshold.

Abstract: In one aspect, articles are described herein comprising composite claddings which, in some embodiments, demonstrate desirable properties including thermal conductivity, transverse rupture strength, fracture toughness, wear resistance and/or erosion resistance. Briefly, an article described herein comprises a metallic substrate, and a cladding adhered to the metallic substrate, the cladding comprising at least 10 weight percent of sintered cemented carbide pellets dispersed in matrix metal or matrix alloy, the sintered cemented carbide pellets having a spherical shape, spheroidal shape, or a mixture of spherical and spheroidal shapes.

Abstract: In one aspect, articles are described herein comprising composite claddings which, in some embodiments, demonstrate desirable properties including thermal conductivity, transverse rupture strength, fracture toughness, wear resistance and/or erosion resistance. Briefly, an article described herein comprises a metallic substrate, and a cladding adhered to the metallic substrate, the cladding comprising at least 10 weight percent of sintered cemented carbide pellets dispersed in matrix metal or matrix alloy, the sintered cemented carbide pellets having a spherical shape, spheroidal shape, or a mixture of spherical and spheroidal shapes.

Abstract: Apparatus for cleaning a tank's inner side includes a tank-mountable frame, a frame-mounted support drivable with respect to the frame about a first rotation axis, a support-mounted nozzle drivable with respect to the support about a second rotation axis transverse to the first axis. The nozzle's spraying direction faces away from the second axis. A controller of the apparatus drives the support and the nozzle, such that the nozzle is rotated about the second axis alternatingly from a start position to a stop position by a predefined cleaning angle smaller than one revolution and from the stop position to the start position. The nozzle angular velocity with respect to the support is smaller than the support angular velocity with respect to the frame within the cleaning angle and smaller than the nozzle angular velocity with respect to the support during movement from the stop position to the start position.

Abstract: A protractor for measuring and constructing angles includes a body having a base member and an arcuate member connecting opposed ends of the base member. A bottom surface of the base member and a bottom surface of the arcuate member are disposed in a substantially identical plane. A degree scale is engageable with a predetermined portion of the arcuate member and an elongated arm has a first end rotatably attached to the base member and has a second end disposed in close proximity to the degree scale. A laser is attached to the second end of the elongated arm and is capable of generating a light beam.

Abstract: A method and apparatus for orienting a flexible walled article, such as a pillow type bag. With the method and apparatus, the article is presented to a pattern detector which detects a pattern on the surface of the article. The detected pattern is compared with at least one of a number of predetermined patterns representing respective orientations of the article, to identify the orientation of the presented article. When the identified orientation is not a required orientation, the article is automatically turned in a manner dependent on the identified orientation so that the article takes up the required orientation.