I have noticed you had not yet received any response to your post. While of course there could be more applicable references given your arguably more rigorous service, I know some general guidance/wording for handling mortar-coated steel pipes is contained in AWWA C205, CEMENT–MORTAR PROTECTIVE LINING AND COATING FOR STEEL WATER PIPE—4 IN. (100 mm) AND LARGER—SHOP APPLIED. Sec. 4.1.3 Manufacture of this standard states, “During the entire period of the application of the lining and coating and the curing thereof, the pipe section shall be carefully supported and handled to avoid damage to the cement mortar. If a pipe section must be moved, this procedure shall be done to protect against damage. Any damaged portion of the lining or coating shall be cut out and replaced.” Also, Sec. 6.1 General of this specification states, “Care shall be exercised during loading, hauling, and unloading to prevent damage to any of the components of the completed pipe. Pipe and specials shall be suitably braced, supported to provide sufficient bearing area to prevent damage to the coating, and tied to prevent shifting or distortion of the pipe during transportation.”
Though this guidance re water pipes might give you some ideas, there certainly might be more applicable specifications or guidance documents, as I would think offshore oil/gas pipe installations are likely/particularly challenging, and as mortar coating systems might vary some more per other specifications/between applicators, and for that matter pipes themselves differ in diameter, length, thickness, weight, internal bracing schemes etc. It thus might also do well to obtain any more specific advice from the specific mortar coating applicator and/or installers etc. experienced in dealing with such pipes in the field (as one would think they might have the most experience in at least the handling of the coated pipes).
