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148-1 Series Twist & Seal High Pressure Heat Exchanger Tube Plugs Sizes: 0.410 to 0.960

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Specifications

These plugs come standard with Stainless Steel insert alloy.

A new, easy way to seal leaking tubes!

The Twist & Seal Heat Exchanger Tube Sheet Plug is a solidonepiece 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 30 mils (.030") to provide a positive mechanical contact seal. The Twist & Seal Heat Exchanger Plug can be used in high or low pressure applications such as feedwater heaters, moisture separator reheaters, preheaters, condensers, coolers, fin-fan coolers or any other tubed heat exchanger.
twist and seal desc

  • 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 shellside 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
  • Twist & Seal Plugs are available to meet Nuclear ASME Sec. III or ISO 9002 QA specifications.

Twist & Seal ...how it works!
The Twist & Seal plug is snapped onto the hex capture driver and inserted into the tube ID, ensuring that the serrated sealing area is within the tube sheet. Applying the initial torque to the driver engages the anti-spin eccentric cam, locking the plug into the tube ID, thereby providing a torsional resistive force. As additional torque (in. lb.) is exerted, the drive screw threads into the plug body, pressing the tapered expansion ferrule into the reverse taper of the plug. These tapered surfaces combine to generate an enormous radial expansion force, swaging the serrated sealing area into the tube wall. A positive mechanical contact seal in excess of 6,500 psi is created.

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Tube Diameter Shpg
Wt
lbs
Item
Number
Unit
Price
Each
Maximum

Minimum

in mm in mm
0.430 10.9 0.410 10.4 0.5 148-1410 US $87.00
0.450 11.4 0.430 10.9 0.5 148-1430 US $87.00
0.470 11.9 0.450 11.4 0.5 148-1450 US $87.00
0.490 12.5 0.470 11.9 0.5 148-1470 US $87.00
0.510 13.0 0.490 12.5 0.5 148-1490 US $87.00
0.530 13.5 0.510 13.0 0.5 148-1510 US $87.00
0.550 14.0 0.530 13.5 0.5 148-1530 US $87.00
0.570 14.5 0.550 14.0 0.5 148-1550 US $87.00
0.590 15.0 0.570 14.5 0.5 148-1570 US $87.00
0.630 16.0 0.610 15.5 0.5 148-1610 US $93.00
0.650 16.5 0.630 16.0 0.5 148-1630 US $93.00
0.670 17.0 0.650 16.5 0.5 148-1650 US $93.00
0.690 17.5 0.670 17.0 0.5 148-1670 US $93.00
0.710 18.0 0.690 17.5 0.5 148-1690 US $93.00
0.730 18.5 0.710 18.0 0.5 148-1710 US $93.00
0.750 19.1 0.730 18.5 0.5 148-1730 US $93.00
0.770 19.6 0.750 19.1 0.5 148-1750 US $93.00
0.800 20.3 0.780 19.8 0.5 148-1780 US $93.00
0.820 20.8 0.800 20.3 0.5 148-1800 US $93.00
0.840 21.3 0.820 20.8 0.5 148-1820 US $93.00
0.860 21.8 0.840 21.3 0.5 148-1840 US $93.00
0.880 22.4 0.860 21.8 0.5 148-1860 US $93.00
0.900 22.9 0.880 22.4 0.5 148-1880 US $93.00
0.920 23.3 0.900 22.9 0.5 148-1900 US $93.00
0.940 23.8 0.920 23.3 0.5 148-1920 US $93.00
0.960 24.3 0.940 23.8 0.5 148-1940 US $93.00

Other sizes available upon request.

These plugs come standard with Stainless Steel insert alloy and are approximately 2" long.

Add Suffix to item number for below alloys:

"1" for Brass

"2" for Carbon Steel

"3" for Cupra Nickel

Twist & Seal Hex Drive Capture Systems and Torque Wrench hex capture drivertorque wrench

Size

 

Shpg
Wt
lbs
Item
Number
Unit
Price
Each
in
mm
Description
0.330 - 0.350
8.38 - 8.89

3/16" Hex Capture Driver with Adapter

0.5

US $43.50
0.430 - 0.560
10.92 - 14.20
1/4" Hex Capture Driver with Adapter

0.5

US $43.50
0.570 - 0.710
14.50 - 18.00
5/16" Hex Capture Driver with Adapter

0.5

US $43.50
0.720 - 1.000
18.30 - 25.40
3/8" Hex Capture Driver with Adapter

0.5

US $43.50
0 - 960 in lbs
Ratchet Torque Wrench
1.0
US $123.00

Installation Instructions
1) A careful measurement of the tube ID should be taken with an inside tube micrometer or a gauging block to determine the actual bore diameter. Select a Twist & Seal Plug that is sized within the range of the measured tube ID. (Example: 0.518" ID tube: use a 148-1510 Twist & Seal Plug.)

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 Twist & Seal Plug is chosen, affix the plug onto the capture hex driver and insert it 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.

WARNING - BE CAREFUL TO AVOID THE FOLLOWING:

A) DO NOT MEASURE TUBE AT ROLL JOINT SEAL WELD (not true tube ID).

B) DO NOT USE IN A TUBE THAT IS MORE THAN .020" LARGER IN DIAMETER THAN THE Twist & 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.
Plug Drive & Torque Selection Chart
Carbon Steel
Stainless Steel / Monel
Brass / Cupra Nickel
Plug Size

Torque

(in lbs)

Plug Size

Torque

(in lbs)

Plug Size

Torque

(in lbs)

0.41 - 0.56"
250
0.41 - 0.56"
300
0.41 - 0.56"
200
0.57 - 0.71"
350
0.57 - 0.71"
500
0.57 - 0.71"
250
0.72 - 1.0"
450
0.72 - 1.0"
600
0.72 - 1.0"
350