Using Malleable Cast Iron Pipe Fittings For Plumbing

by | Jun 8, 2023 | News

For more than a century, malleable cast iron pipe fittings have been utilized in plumbing, drainage, and steam systems. The fittings are produced from cast iron that undergoes processing to increase its ductility, hence the name “malleable” cast iron.

Feature Of Malleable Cast Iron Fittings

Malleable cast iron fittings feature threaded connections that mate with both cast iron pipe and threaded black iron pipe. They are often used in combination with threaded cast iron drainage pipe and threaded steel pipe for water lines and gas lines.

Main Types Of Malleable Cast Iron Fitting

Malleable cast iron fittings include elbows, tees, couplings, nipples, street elbows, unions and caps. They are typically galvanized or black, with black being more common for drainage applications and galvanized used for potable water lines.

Malleable Cast Iron Fittings Offer Several Advantages

Malleable cast iron fittings offer several advantages over other pipe fitting materials. They are:

  • Corrosion resistant – The zinc galvanizing on fittings protects against corrosion from water, soil and chemicals.
  • Durable – Malleable cast iron fittings can last 50 years or longer with proper use and care.
  • Easy to repair – Malleable cast iron fittings can be re-threaded if needed to repair leaks.
    •Good seal – When installed correctly with pipe thread sealant, malleable fittings form a leak-proof seal.
  • Sturdy – The threaded connections provide a strong, reliable joint.

When installing malleable cast iron fittings, it is important to use the correct type of pipe thread sealant, properly lubricate the threads and tighten fittings to the recommended torque specifications. Inspect threaded joints regularly for leaks and retighten if needed.

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