What should be considered when connecting malleable iron pipe fittings?

Malleable iron pipe fittings, also known as malleable cast iron pipe fittings, are typically installed using threaded connections. Below are the detailed installation steps:

Preparation

Before beginning installation, ensure the pipe fittings and pipe connection areas are clean, dust-free, and free of rust. Verify that the pipe length and angles comply with

design specifications to avoid installation difficulties due to dimensional issues.

Pipe Connection

Apply an appropriate amount of sealant to the joint interface. Insert the pipe smoothly into the fitting, typically to a depth of about one-third of the pipe diameter.

Excessive insertion may compromise sealing integrity. Ensure the contact surface between the pipe and fitting is flat, tight, and gap-free.

Fitting Securing

After connection, secure the fitting in place using bolts provided with the malleable iron fittings or other suitable materials. Avoid using steel fasteners to prevent corrosion.

Apply appropriate torque when tightening bolts—neither over- nor under-tighten.

Testing and Acceptance

After installation, test and verify the performance of malleable iron fittings, including critical parameters such as sealing integrity and pressure resistance. Acceptance

methods may include ultrasonic testing or pressure testing.

Common Issues and Solutions

Pipe Insertion Too Deep: Adjust insertion depth to ensure it is approximately one-third of the pipe diameter.

Uneven Sealant Application: Apply sealant evenly across the joint interface.

Improper Bolt Tightening: Adjust bolt torque to ensure neither over-tightening nor under-tightening occurs.

Abnormal Test Data: Adjust installation based on specific conditions or consider replacing components.

Precautions

The specific usage of malleable iron fittings may vary based on actual application scenarios and requirements. During installation and operation, adhere to relevant

standards and specifications, making reasonable adjustments according to practical conditions. Ensure the quality of malleable iron fittings meets requirements to

guarantee the safe and stable operation of the piping system. For any further questions regarding the use of malleable iron fittings, consult professional piping installers

or relevant technical experts.