5.9.1(f) Joints. The number of mechanical joints in systems conveying flammable fluids is to be kept to a minimum. In general, flanged joints conforming to recognized standards are to be used. 5.9.1
(g) Support and Alignment. Piping in which a mechanical joint is fitted is to be adequately adjusted, aligned and supported. Supports or hangers are not to be used to force alignment of piping at the point of connection. 5.9.1
(h) Slip-on Joints. Slip-on joints are to be accessible for inspection. Accordingly, slip-on joints are not to be used in pipelines in cargo holds, tanks and other spaces that are not easily accessible, unless approved by ABS. Application of these joints inside tanks may be permitted only for the same media that is in the tanks. Unrestrained slip-on joints are to be used only in cases where compensation of lateral pipe deformation is necessary. Usage of these joints as the main means of pipe connection is not permitted. 5.9.1
(i) Application. Application of mechanical joints and their acceptable use for each service is indicated in 4-6-2/Table 10. Dependence upon the Class of piping, pipe dimensions, working pressure and temperature is indicated in 4-6-2/Table 11. In particular cases, sizes in excess of those mentioned above may be accepted by ABS if in compliance with a recognized national or international standard.