Abstract: Apparatus for the monitoring of the fluid environment in a pipeline (14) is described comprising a pigging vehicle (1), within which are contained sensing means (5, 6 and 7) and a data logging device (3). The dimensions of the pigging vehicle (1) are such that its movement is not forced in a conventional manner along the pipeline (14), but instead the pigging vehicle (1) simply travels along under the influence of the production fluid (100). The pigging vehicle (1) further comprises a weight changing mechanism (9) that moves between a first and second condition. After a predetermined time, or after travelling a predetermined distance, the weight changing mechanism (9) may be activated so as to adjust the floatability of the device. By employing this monitoring apparatus advanced warnings of areas of a pipeline that are vulnerable to corrosion can be detected along with areas which have already degraded due to corrosion.

Abstract: A truck box comprises a front wall, back wall, bottom wall, top lid and a pair of opposed end walls each of which is fabricated from a one-piece, continuous section of aluminum plate which undergoes bending operations to form a one-piece end wall construction.

Abstract: An oxygen sensor which exhibits a change in electrical resistance as a function of oxygen partial pressure, comprises at least one of strontium ferrate (SrFeO.sub.3-x), barium ferrate (BaFeO.sub.3-x), and strontium barium ferrate (Sr.sub.1-b Ba.sub.b FeO.sub.3-x), where x is a variable and determines the degree of oxygen deficiency of the oxide, and b is 0 to 1, in which part of the iron in the ferrate lattice has been replaced by at least one element selected from the group consisting of zirconium, hafnium and tin.