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Point Counterpoint: single-stack systems for high-rise buildings: why select the Philadelphia single stack.

Publication: PM Engineer
Publication Date: 01-APR-09 		Format: Online
Delivery: Immediate Online Access

Article Excerpt
While researching the Philadelphia Single Stack system for this article, I frequently came upon the name of Joseph Smaul, P.E. Who was Joseph Smaul? In the ASPE Chapter/Philadelphia engineering world, Joe was the "Philly Single Stack" guy. He designed, built and taught the single stack for more than 50 years. Unfortunately, Joe passed away suddenly this past summer and is greatly missed by the ASPE community.

For the technical content of this article, I've decided to remember Joe by presenting some edited segments from an Aug. 2003 article he wrote for pine titled, "Hotel/Motel Plumbing Utilizing the Philadelphia Single Stack System."

Overview. The single stack, also commonly known as a wet vent system, is based on the theory that the drain lines will be of sufficient size to accommodate the three factors involved in any drainage system: solids, liquids and air. The single stack system used in Philadelphia was developed based on this theory.

Plumbing Engineer Benefits & Basic Design

What is the main benefit that this system offers plumbing engineers? Without a doubt, the answer is cost-effective installation. Let me explain why.

[ILLUSTRATION OMITTED]

First, the Philadelphia single stack...

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