With an emphasis on design and installation for optimum performance, the 2015 INTERNATIONAL PLUMBING CODE SOFT COVER sets forth established requirements for plumbing systems. This important reference guide includes provisions for fixtures, piping, fittings, and devices, as well as design and installation methods for water supply, sanitary drainage, and storm drainage. The 2015 edition of the code includes information on public toilet facilities, as well as water temperature limiting devices, and replacement water heater installation. Using both prescriptive- and performance-related specifications, this code provides comprehensive minimum regulations for a variety of plumbing facilities, facilitating the design and acceptance of new and innovative products, materials, and systems.

One of the performance requirements of great importance in relation to plumbing is hydraulic adequacy or hydraulic performance, which is related primarily to the general attribute of health and safety.The scope of the presentation is limited to certain aspects of the hydraulic performance of sanitary drain-waste-vent (DWV) systems. Considerable savings in material and labor costs have been reported to be possible through the use of a single-stack drainage system in place of a conventional system.The development of the experimental work reported herein came about as the result of a request to make technical recommendations concerning the suitability of such a system in a particular installation.Described is a test program developed looking toward the evaluation of the system against the essential criteria.

A summary is presented of a research program aimed at the improvement of high-temperature strain gages of the electrical resistance type. Potential ceramic and metal components were evaluated and a gage was devised that was based on these evaluations. This gage (NBS 5B) was flexible and easy to install; however, it lacked resistance stability at higher temperatures. In an attempt to minimize this deficiency, ceramic cements were developed that showed greater electrical resistivity than had been previously observed in the range 800 to 1800 degrees Fahrenheit; also, a technique was devised for increasing the resistance to ground by applying a fired-on ceramic coating to the grid of a specifically developed unbacked gage. A study was made of the cause of the erratic response of cemented gages that had not been preheated prior to use. There were strong indications that the erratic response was caused mostly by the rapid decrease in resistance that accompanied structural changes in the cement.