PIPE MARKING Clause Samples

PIPE MARKING. The Contractor shall mark all piping in the vessel to indicate its service and usage in accordance with the contract drawing. The pipes shall be marked at each termination and at each watertight bulkhead penetration to indicate service and flow direction. Piping shall also be marked at the midpoint of long compartment runs. Standard markers, color bands and flow arrows, similar to those available from Graphic Products DuraLabel system, may be used. The size of the legend letters and the length of the marker color field shall be as follows: OUTSIDE DIAMETER OF PIPE OR COVERING IN INCHES MINIMUM LENGTH OF COLOR FIELD IN INCHES SIZE OFLEGEND LETTERS IN INCHES ¾ to 1¼ 8 ½ 1½ to 2 8 ¾ 2½ to 6 12 1¼ 8 to 10 24 2½ over 10 32 3½ For identification of materials in pipes of less than ¾ inch in diameter, and for valve and fitting identification, the use of permanently legible tag is required. When the piping layout creates or occurs in a limited area of inaccessibility or of extreme complexity, such segments of layouts may require substitute techniques to achieve positive identification. Use of substitute techniques shall be limited to such segments and shall not deviate from the concept of identification described above. Attention shall be given to visibility with reference to pipe markings. Where pipe lines are located above or below the normal line of vision, the lettering shall be placed below or above the horizontal centerline of the pipe. Label plates shall be attached to all valves and pumps to indicate the system and function of the equipment. For valves, the label plates shall be installed over the stem of the hand wheel, where possible, and shall indicate the direction of opening (or closing). The nameplate shall be 14 gauge (or heavier) brass with ¼ inch high engraved letters filled with black paint. A laminated pipe color legend shall be installed in the admin office, machine shop, and machinery space. A. CONTRACT DRAWINGS B. REFERENCE DOCUMENT