MSS SP-109-2018 covers factory-made, weld-fabricated, copper pressure fittings in nominalsizes 1/4 through 12. Included in this Standard Practice are: a) Pressure-temperature ratings b) Abbreviations for end connections c) Size and method of designating openings of fittings d) Marking e) Material f) Weld specifications g) Laying lengths h) Inspection tolerance i) Alignment j) Testing k) Gauging