HDTW, Heavy Duty Torque Washer.

HDTWhttp://sfsb.be/home/hdtw/
PROBLEM Leakage due to loss preload

Embedment relaxation

Gasket Creep

Bolt creep/Stress Relaxation

Vibration

Differential Thermal Expansion

Elastic Interaction
SOLUTION HDTW
1
Create a more reliable assembly

Even load distribution,

Maintains residual gasket/bolt load

Longer gasket life
2
Simplified Installation

Can be used with any bolting technique
(torque wrench, tensioners, slug wrench)

No need to hot tighten

Lower fugitive emissions
3
Less down time

No leaks

HEAVY DUTY TORQUE WASHERS
are used to maintain a designed bolt load or torque or bolt stress.

TECHNICAL INFORMATION
• The H-13 HDTW are designed to fit ASME/ANSI b16.5 flanges
• They are manufactured to match 30, 45 and 60.000 lb bolt stress
• The ID of the washer is determined by the bolt size
• The OD of the washer is determined by the area between the edge of the flanges and the hub
• The thickness is determined by the design criteria to match 30, 45 and 60.000 bolt stress
• All H-13 HDTW are totally machined
On a valve, the HDTW are used on the gland follower studs
and/or the bonnet bolts to maintain the load on the packing or gasket.
INSTALLATION
Typical installation Recommended with
bolt tensioner
Additional load or
movement needed