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.