TABLE OF CONTENTS Daniel A. Van Duyne, P.E.
Senior Design Engineer, Northeast Utilities
Millstone Nuclear Power Station, Waterford, Connecticut
Formerly Assistant Chief Engineer, Mechanical Division
Stone & Webster Engineering Corporation
Boston, Massachusetts
In this chapter we will first review the basics of piping system design for steam systems applications; we will then consider specifics for underground steam piping and steam piping used in power plants.
Condensate. Condensed steam.
Trunk line distribution system. Distribution system with a large-diameter line leaving the boiler plant; as lateral branches are installed off it for service, the trunk line gradually diminishes in diameter.
Main and feeder network distribution system. Distribution system that receives its supply of steam through a high-pressure feeder main leading from the plant through the network; the size of the feeder main required in this case is not as large as in a trunk-line system with the same boiler-plant steam pressure.
Protective conduits (typically for underground steam lines). Enclosures for underground steam mains and services to (1) protect the pipe and insulation from damage due to earth pressure and impact loadings, (2) allow free longitudinal expansion and contraction while held in proper alignment, and (3) prevent groundwater seepage or flooding by providing either drains or a completely waterproof structure.
Light water reactors (LWR). Nuclear power reactors of either the pressurized water reactor (PWR) or boiling water reactor (BWR) type.
ASME Class 1 1 piping. Includes main steam piping up to and including the first stop...
