Which of the following materials is NOT typically used for field joints in pipeline coatings?

Pipeline coatings are designed to protect the integrity of the pipe from environmental factors, corrosion, and other forms of degradation. When it comes to field joints specifically, certain materials are preferred due to their properties and ease of application.

Heat shrink sleeves, liquid epoxies, and cold-applied tapes are all commonly used in the field for joint protection. Heat shrink sleeves provide a strong, water-resistant seal and adapt to the pipe's contours. Liquid epoxies allow for thorough coverage and bonding, filling any gaps that may exist in the joint. Cold-applied tapes offer flexibility and can be applied easily without heating, making them ideal for field applications.

On the other hand, paint is generally not utilized for field joints in pipeline coatings due to its limited protective capabilities in a joint configuration. Paint lacks the necessary thickness and adhesive properties required to manage the stresses and potential moisture ingress that can occur at joints. Instead, it is more typically used as a topcoat over other protective measures, rather than as a primary solution in the field joint area.

In summary, the correct choice is based on the specific applications and protective characteristics of materials designed for field joints, where durable and bonding solutions are required, making paint an unsuitable option.