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TUBE ROUTING AND INSTALLATION
7.1 The contractor shall route tubing and locate supports in a manner that avoids obstructing operation, maintenance or removal of equipment, instruments, control panels, and overhead cranes. Walkways, platforms, ladders, and stairs shall not be obstructed in any manner. The contractor shall obtain approval from the Company representative before routing any instrument tubing. If dimensional locations or slope details are provided, however, they must be applied without modification while maintaining the guidelines set forth in paragraph 5.2.
7.2 Unless specifically indicated otherwise, the contractor shall furnish, fabricate, and install tubing and tubing support systems in accordance with the contract drawings and the construction specifications.
7.3 All tubing runs shall be installed and supported in accordance with Section 10 of this specification. The finished installation shall display a high quality of workmanship and shall be subject to a pre-acceptance final inspection by the Contractor representative. The requirements (in addition to those specified in the contract drawings and standards) are as follows:
7.3.1 Tubing runs shall be installed straight and parallel or perpendicular to equipment lines and shall be uniformly spaced. Rolled tubing must be stretched straight before installation. Tubing shall be stretched no more than 1% [150 mm (6 in) per 15.2 m (50 ft) coil].
7.3.2 Tube bends shall be made with industrial type tube benders and a minimum radius of four times the tube diameter. Bent tubing shall not display obvious flattening or distortion.
7.3.3 Unsupported runs of 6 mm (1/4 in) OD copper tubing shall not exceed 300 mm (12 in). Unsupported runs of 10 mm (3/8 in) OD or larger copper and stainless steel tubing shall not exceed 600 mm (24 in).
7.3.4 To minimize the quantity of tubing unions required, the maximum practical continuous lengths of tubing shall be used on all process and analyzer sample tubing.
7.3.5 All instrument tubing and supports shall be a minimum of 200 mm (8 in) from any cryogenic or process piping that has yet to be insulated.
7.4 Swagelok or Parker A-Lok tube fittings shall be installed in strict accordance with the manufacturer’s instructions. The contractor shall have at least one copy of Swagelok’s or Parker’s Tube Fitting and Installation Manual on-site and shall ensure that personnel installing tubing are familiar with the manual contents. Classes conducted by the selected manufacturer are the preferred procedure to ensure a quality installation. Conformance to the “1-1/4 turn” tightening procedure is of particular importance.
7.5 The contractor shall ensure that all personnel who install tubing are furnished with Swagelok’s or Parker’s “No-Go” inspection gauges and that each and every fitting is checked with a gauge by the installer upon completion.
7.6 All tubing shall be “bottomed out” into the fitting before ferrules are made up and the fitting is tightened.
7.7 The contractor shall refer to 3PI55005 for thread sealants used on all pipe connectors and shall not apply the selected material to the leading two threads of the fitting.
7.8 The contractor shall not cut or crimp capillary tubing. The tubing shall be supported and protected in channel with all excess tubing coiled at the related instrument.
7.9 The National Electrical Code (NEC) prohibits the installation of tubing and/or tube bundles by any means on, from, or in cable tray systems that contain electrical cables.
7.10 Unless otherwise specified on contract drawings, the contractor’s tubing installation responsibility stops at all panel bulkheads.
7.11 When tubing tees are used for bleeding or calibration, the compression fitting nut must be removed before installing the plug.