Coverage. This document presents recommendations for designing@ fabricating@ and operating through flowiine (TFL) equipment. a. The procedures and guidelines herein presented have evolved through application of successful past experience. b. TFL systems@ described herein should not be confused with pumpdown systems which use only vertical entry and tool movement. c. This document addresses TFL pumpdown primarily as an offshore system. however@ onshore applications do exist and the same guidelines and procedures can apply. d. This tentative recommended practiceis not to be construed as a specification nor is it intended to be used as fixed rules without regard to sound engineering judgment TFL technology must be recognized to be in its early stages Companies are trying new techniques@ evaluating their results and modifying designs. materials@ and operating schemes. Policy. This API tentative recommended practice may be used by anyone desiring to do so@ and every effort has been made by the Institute to assure the accuracy and reliability of the data contained in it However@ the Institute makes no representation@ warranty or guarantee in connection with the publication of any .API specification or recommended practice and hereby expressly disclaims any liability or responsibility for loss or damage resulting from their use for any violation of any federal@ stale or municipal regulation with which an API specification or recommended practice may conflict or for the infringement of any patent resulting from the use of an API specification or recommended practice