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Thread Sealing Tips Thread Sealing Tips Sealing N.P.T. threads can be an exasperating experience if certain techniques are not followed. The following tips will help alleviate many common problems in thread sealing: 1. Always use some type of sealant (tape or paste) and apply sealant to male thread only. If using a hydraulic Thread Seal Type sealant, allow sufficient curing time before system is � A seal is obtained by applying a sealant to the male pressurized. thread before engaging. 2. When using tape sealant, wrap the threads in a clock- � The sealant is used to prevent spiral leakage. wise motion starting at the first thread and, as layers are � Thread tape or paste is the preferred sealant in this applied, work towards the imperfect (vanishing) thread. type of application. If the system that the connection being made to cannot � Please refer to page 500 for thread tape options. tolerate foreign matter (i.e. air systems), leave the first thread exposed and apply the tape sealant as outlined above. 3. When using paste sealant, apply to threads with a brush, using the brush to work the sealant into the threads. Apply enough sealant to fill in all the threads all the way around. 4. When connecting one stainless steel part to another stainless steel part that will require future disassembly, use a thread sealant that is designed for stainless steel (see page 500). This stainless steel thread sealant is also useful when connecting aluminum to aluminum that needs to be disconnected in the future. These two materials gall easily, and if the correct sealant is not used, it can be next to impossible to disassemble. 5. When connecting parts made of dissimilar metals (i.e. Washer Seal Type steel and aluminum), standard tape or paste sealant per � A seal is obtained when the male thread is tightened forms satisfactory. down onto the washer of the female assembly. 6. For sizes 2" and below, tape or paste performs � The washer should be inspected regularly and satisfactory. When using thread tape, four wraps replaced as needed to prevent leakage. (covering all necessary threads) is usually sufficient. � Please refer to pages 223, 235 and 492 for 7. For sizes 2�" and above, thread paste is recom replacement washers. mended. If thread tape is used, eight wraps (covering all necessary threads) is usually sufficient. Apply more wraps if necessary. 8. For stubborn to seal threads, apply a normal coating of thread paste followed by a normal layer of thread tape. 9. For extremely stubborn to seal threads, apply a normal coating of thread paste followed by a single layer of gauze bandage followed by a normal layer of thread tape. Caution! When this procedure is done, the connection becomes permanent. Extreme measures will be necessary to disconnect these components. All other measures to seal the threads should be explored prior to use of this technique. Mechanical Seal Type � A seal is obtained through metal to metal contact or 10. Over-tightening threads can be just as detrimental as metal to seal contact, i.e. JIC couplings (page 311) insufficient tightening. For sizes 2" and below, hand have a metal to metal seal. EZ-Boss Ground Joint tighten the components and, with a wrench, tighten 3 couplings (pages 83, 86) have a metal to seal contact, full turns. For sizes 2�" and above, hand tighten the (shown above). components and, with a wrench, tighten 2 full turns. � The couplings should be retightened as needed to prevent leakage. 524 DPL108 pages518-554.pmd 524 10/5/2007, 10:29 AM
Goodyear Rubber Products
