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From P to P

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Chad Merritt
Chad Merritt

Brandon Iron

We describe the structural and variable temperature magnetic susceptibility properties of an unusual homoleptic bimetallic iron(III) thiocyanate tetraanion. This work represents the first structurally characterized bis(μ-1,3-thiocyanato) dimer of iron(III). A weak antiferromagnetic exchange interaction is observed between the two iron(III) ions, which is supported by broken symmetry density functional theory (DFT) calculations.

brandon iron

Gravity and magnetic data in conjunction with available drill hole data were used to decipher the nature of the volcanic lithologies and their relationship to iron oxide ore deposits within the northwest portion of the Mesoproterozoic St. Francois Terrane in southeast Missouri. Analyses of the data included creating a deep-seated gravity anomaly map by removing the gravitational effect of the Paleozoic sedimentary units, residual gravity and magnetic anomaly maps, and two and one-half dimensional gravity and magnetic models. The residual gravity and magnetic anomaly maps highlighted a series of short-wavelength maxima and minima anomalies that could be interpreted to be granitic within collapsed caldera systems surrounded later by ring intrusions. The gravity and magnetic models illustrate that the sources of the anomalies are situated mainly within the upper 5 km of the crust and help to constrain the location of suspected calderas. The iron oxide deposits, some of which contain significant quantities of REE minerals, are rarely associated with both residual gravity and magnetic maxima but may be on the edge of these maxima and/or occur over gravity minima. The REE-rich Pea Ridge deposit is located over a gravity minimum where modeling shows the main ore body extending down to 1.5 km with a low-density region extending to 5 km below the ore body. The cause of this low-density body is unknown but may be associated with the formation of the ore deposit. Potential iron oxide deposits may occur to the south and southwest of Pea Ridge based on our analysis while to the northeast of the Pea Ridge deposit an anomaly pattern similar to that over Pea Ridge was found.

Four 48-inch diameter cast iron outfall pipelines were inspected and rehabilitated in the San Francisco Bay. The inspections included internal and external inspections, pipe structural supports and the ductile iron diffusers. Visual and ultrasonic thickness inspections were conducted on the pipe exterior. Internal inspection was conducted by divers. Rehabilitation included removal of the existing mortar lining and relining of the pipe with an epoxy system and implementation of cathodic protection on the pipe external surfaces. This case study describes the testing and inspection procedures utilized and challenges faced during ultrasonic thickness measurements of old cast iron pipe.

The NPO originates downstream of the NPF 500 Dechlorination Building (NPF 500). Effluent discharges over a weir, then, successively, through a closed channel conduit before transitioning to an 8-ft (2.4 meter) diameter reinforced concrete sewer, sending primary effluent flow eastward under Bay Street. The 8-ft (2.4 meter) sewer then splits into two 6 ft. (1.8 meter) diameter reinforced concrete sewers under the intersection of Bay Street and The Embarcadero. One of the 72-in (6 ft.) diameter reinforced concrete sewers conveys effluent toward Pier 33; the other one conveys effluent toward Pier 35. Prior to reaching the bulkhead wall (seawall), each 6 ft. (1.8 meter) diameter reinforced concrete sewer subsequently divides into two (2) 4 ft. 1.2 meter) diameter reinforced concrete sewers under The Embarcadero. The four 4 ft. (1.2 meter) diameter reinforced concrete sewers transition to 4 ft. (1.2 meter) diameter cast iron pipes (CIPs) near the seawall under Piers 33 and 35. The CIPs, which hang below the pier decks, extend approximately 1000 feet (300 meter) into San Francisco Bay toward the end of its respective Pier. In the 1970s, four diffuser pipes, approximately 85 ft. (25 meter) long, were added to meet regulatory discharge requirements. Each diffuser pipe includes eighteen ports with staggered centers to promote dilution. The diffuser pipes are aligned under both piers and supported by steel beams fastened to pier structural piles. See Figures 1 & 2 below for NPO alignment and schematic. 041b061a72


Think tank for dissolvable PP bag evolution.
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