OPUS

Chemical Waste Drainage: Polypropylene (PP) Pipe

Image provided by University Marelich Mechanical, Inc.

Chemical waste and vent systems are designed to convey chemical waste to a dilution tank or...
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Polypropylene (PP) is the lightest weight piping material with very good chemical resistance,...
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Benefit of Material to Systems Application

Polypropylene (PP) has been one of the most common materials specified for acid waste piping systems in North America for more than 30 years. Resistant to a wide range of acids and bases, polypropylene can withstand a pH range of less than 2 to more than 13. However, while polypropylene is an economical choice for chemical resistant piping, it is combustible and is often not allowed by building codes that do not permit combustible pipe to be exposed in certain areas including return air plenums. In situations where fire resistance is required, the newer PVDF piping is a useful alternative.

System Application and Material Usage

Most proprietary PP acid waste systems carry several approvals and are listed with industry governing bodies and specifying organizations including IAPMO, NSF and ASTM.

Acid waste drainage systems require several components, including acid-resistant floor drains, neutralization tanks and pH monitoring devices. In cases where chemical neutralization is required prior to discharge into the sewer, the waste flow is directed to and collected in neutralization tanks containing limestone. In some situations, a double containment system may be desired or required. Consult current ASME standards for assembling these systems.

Acid waste systems being routed through a return air plenum must meet the 20/50 flame spread and smoke development requirements of ASTM E84 or the more stringent flame propagation and smoke density requirements of UL910. Because of this requirement, glass piping has remained the traditional product of choice for acid waste piping with PVDF offered as an alternative. However, standard flame retardant PP acid waste systems can also meet these requirements if installed in fiberglass insulation or in a ceramic fiber plenum wrap. Although some additional material and labor is required, the substantial difference in material cost can make PP a viable cost effective alternative to glass or PVDF in a return air plenum.

PP acid waste drainage systems can be joined with either fusion joints or mechanical joints, depending on size, system requirement, and application. In acid waste systems, electrical coil welding is the preferred fusion joint method. When permanently bonded systems are not an option, several different kinds of 'mechanical joint' systems are available. Threads and flanges are the most common types of mechanical joints, though several PP acid waste systems feature a different kind of connection which is much quicker and less cumbersome than flanging. Threads are used mainly in conjunction with 'true-union' type fittings, allowing components or sections of the system to be quickly and efficiently assembled and disassembled repeatedly with no loss of system integrity. The same pipe is used for both fusion and mechanical joining methods.

Polypropylene high chemical resistance makes it inert to most solvents, so permanent bonding cannot be achieved through a solvent cement process.

Manufacturers and Suppliers Participating in OPUS

Aquatherm

Aquatherm is dedicated to providing the very best piping systems for anyone, from engineers to......
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Asahi/America, Inc.

Asahi/America pioneered the market for thermoplastic valves in the United States and Latin......
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Embassy Group LTD

Embassy Group LTD is a 100-percent member owned, 3.2 billion dollar corporation consisting of......
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F.W. Webb Company

F.W. Webb Company is a multi-faceted distributor of plumbing and heating, HVAC and controls,......
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Ferguson

Ferguson specializes in providing PVF, Plumbing, HVAC and Related Specialty Products and......
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Galloup Company

J.O. Galloup Company is a premier distributor of commercial and industrial piping products,......
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Hajoca Corporation

Founded in 1858, the Hajoca Corporation is the largest privately owned wholesale distributor of......
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Jomar Valve

Founded in 1966 by former Navy Commander Joseph Martin, Jomar Valve set out to change the way......
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MORSCO

MORSCO is a leading U.S. distributor of commercial and residential plumbing, HVAC, and PVF, with......
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Watts Water Technologies

Watts Water Technologies  designs and manufactures valves and related fluid handling......
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Weldbend Corporation

Weldbend Corporation is a manufacturer of carbon steel welding fittings and forged steel......
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Winsupply

WinWholesale, Inc. is comprised of over 525 wholesale distribution locations. Along with Noland......
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Zurn Industries, LLC

Zurn Industries markets and manufactures roof/floor drains, interceptors, cleanouts, water......
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Applicable Joining Methods

Heat Fusion Weld

Thermoplastic pipe which cannot be solvent cemented maybe joined using heat fusion.  Fusion...
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Mechanical

Used for ductile iron pipe, the mechanical joining method consists of a number of components...
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