How To Cut Cast Iron Pipe With An Angle Grinder. (cast iron is quieter than plastic). A decent pair of work gloves with basic impact protection
A diamond wheel in an angle grinder is another possibility. A sawzall with a long diamond tip blade might work for you.
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After using the angle grinder to cut cast iron i have some key takeaways. Allow the grinding wheel to penetrate a single point of the pipe and finish by cutting around that point.