A primer on sump/sewage pumps and why we use them. The terminology varies to describe these pumps, but typical names include sewage pump, sump pump, sewage ejector, lift station pump, effluent pump, bilge pump, nonclog pump, drain water pump, solids-handling sewage pump, grinder pump, dewatering pump and wastewater pump.
There are many equations for determining the flow in natural gas pipes and the pressure drops associated with those flows, or vice versa. Our intent is to determine the validity of each equation with respect to flow rates that might be encountered by a plumbing engineer.
In the September 2019 Plumbing Engineer article on “Natural Gas Pipeline Systems on Site Distribution – Pipeline Materials and Installation Requirements,” the discussion centered on using carbon steel piping for above-ground installations and polyethylene (PE) piping for below-grade installations.
Purposes of this article, discussion will be limited to pipelines installed in Location Classes 3 and 4 (suburban and urban environments) and in low pressure distribution systems and service lines (downstream of transmission systems) and for pipelines NPS 12 (DN 300) and smaller.
The codes covering higher-pressure natural gas distribution systems are CFR-2011 Title 49, Volume 3, Part 192, Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards and ASME B31.8, Gas Transmission and Distribution Piping Systems.