return mains

return mains

Pipes or conduits which return a heating or cooling medium from the heat transfer unit to the source of heat or refrigeration.
References in periodicals archive ?
The PAC shall be connected to the central chilled water system by extending 6-inch HDPE chilled water supply and return mains between the existing chilled water piping at Bard Hall and the PAC, crossing over the Stone Arch Bridge.
100 mm) supply and return mains from Science Center to Academic Center (850 ft [259 m] total) were estimated to cost $53,600; and
Ductwork may also benefit from an Internal fiberglass lining (which serves as thermal insulation and absorbs sound) or a canvas collar between the equipment and the supply and return mains, which would limit vibrations that resonate through the duct, says Tony Mori, senior HVAC estimator and planner for Crockett Facilities Services.
Project scope The project will be divided into three main areas of Qatar:* The project comprises a conveyance system consisting of 40 km of deep main trunk sewer and over 70 km of lateral interceptor sewers;* One large and approximately 60 m deep terminal pump station; and * New Doha South advanced sewage treatment works with an initial capacity of 500 million litres per day and more than 70 km of treated sewage effluent return mains and pump station.
Thus, the value of end loops is quite significant during a main pipeline failure as they help with flow redistribution to the open supply and/or return mains.
RJN will evaluate the feasibility of combining these pipes together into a single sewer main, which would cross State Highway 303 and several 12-inch high pressure gas and salt water return mains.
The project's highlights include a more than 70km long treated sewage effluent return mains, a deep terminal pump station of approximately 60m, advanced sewage treatment works with an initial capacity of 500mn liters per day, a conveyance system consisting of over 30km of deep main trunk sewerage and 70km of lateral interceptor sewers.
With roof-mounted boilers, the water supply and return mains could be run inside the warm buildings to manifolds mounted at the street level.
Contract Award Notice: The Scope of the Works provides for the replacement of the existing underfloor (in a service trench) heating flow and return mains and the mains water, tank water and hot water flow and return pipework together with its associated insulation / cladding and all supports etc.
In July's "Big Plant in a Small Space" by Blake Ellis, in Figure 4 the chilled water expansion tanks (and makeup) are shown connected to the upper and lower return mains.
Contract Notice: The Scope of the Works provides for the replacement of the existing underfloor (in a service trench) heating flow and return mains and the mains water, tank water and hot water flow and return pipework together with its associated insulation / cladding and all supports etc.
Control is entirely governed by the pressure difference between the supply and return mains.