TORQ N’ SEAL® Heat Exchanger Tube Sheet Plug
A solid one piece plug that can be inserted into the tube sheet of a leaking tube and expanded with a standard 3/8″ drive torque wrench. The plug will expand approximately 35 mils (.035″) to provide a positive mechanical contact seal. The TORQ N’ SEAL® Heat Exchanger Plug can be used in high or low pressure applications such as feedwater heaters, moisture separator reheaters, preheaters, condensers, coolers, or any other tubed heat exchanger. For Fin Fan cooler we offer a special design called the Top Hat Torq N’ Seal plug.
Positive sealing in excess of 6500 PSI is achieved without special tooling or personnel training.
Plug can be inserted to any depth of the tube sheet in order to avoid severely corroded areas on the tube sheet face.
Design enables rapid implantation and fit into tight areas adjacent to the tube sheet/shell joint interface, baffle plates and internal dividers.
One piece design enhances sealing characteristics by eliminating second potential leak path common to design found in two piece plugs.
Wide sealing area contact zone ensures a positive seal while the gradual and symmetrical torque expansion eliminates thermal and mechanical shock to the tube sheet, commonly found with welding, impact due to hammering of tapered pins, and explosive insertion methods.
Exclusive design allows installation of plugs at the face and back side of the tube sheet in order to prevent intrusion of shell side corrosives. With single plugging techniques accomplished on the face of the tube sheet, corrosives can enter the void created in the tube sheet, thereby exacerbating erosion and corrosion of the tube sheet ligaments
1) A careful measurement of the tube I.D. should be taken with an inside tube micrometer or a gauging block to determine the actual bore diameter. Select a TORQ N’ SEAL® Plug that is sized within the range of the measured tube ID: i.e., for a 0.518″ ID tube: use a TNS/510-530 (expansion range: 0.510″ – 0.530″).
2) Clean the tube of any loose scale or corrosive oxide formation. If the tube is out of round, extremely eccentric, or cracked, a straight spiral drill reamer should be used to resize the bore of the tube or remove the tube completely.
3) After the correct size TORQ N’ SEAL® Plug is chosen and the tube is prepped, affix the plug onto the Hex Capture Driver. Insert the plug into the tube in the tube sheet area of the heat exchanger.
4) Using a ratcheting (in. lb.) torque wrench, begin slowly tightening to the right until you feel the anti-spin eccentric cam lock in place. If the cam does not lock, then the plug is too small for the ID of tube and cannot expand enough for this particular application. After the cam locks it will feel as if there is an even resistance of about 100 in. lbs. Continue applying torque to expand the plug body until you reach the desired torque listed in the chart below. The recommended installation torque will also be listed on the label of the plug box
BE CAREFUL TO AVOID THE FOLLOWING:
A) DO NOT MEASURE TUBE AT ROLL JOINT SEAL WELD (Not true tube I.D.).
B) DO NOT USE IN A TUBE THAT IS MORE THAN .020″ LARGER IN DIAMETER THAN THE TORQ N’ SEAL PLUG.
C) DO NOT PUSH THE DRIVE ADAPTER AGAINST THE TUBE SHEET FACE.
The expanding screw threads into the plug body and may slip off the drive prior to sealing.
D) DO NOT place plug in an internal tube area near a step roll transition or a tube with severe pitting, corrosion or crack.