DuraSquirt DTI Single Pass Flange System
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DuraSquirt DTI Single Pass Flange System

The DuraSquirt DTI Single Pass Flange System consists of a numbered set of unique washers that allow the user to install flange bolting in a single pass. Using experimentally determined elastic interaction coefficients, the user fully torques a flange in a single tightening pass while achieving uniform bolt stresses around the flange. The groundbreaking procedure was made possible by determining and compensating for elastic interactions between all bolts within a flange. As bolts within a flange are tightened, the tightening of each individual bolt interacts with other bolts on the flange, causing them to tighten or loosen without nut rotation. By predicting these interactions, a numbered set of indicating washers can be designed such that each bolt is tightened to a defined tension depending upon its location in the tightening pass, resulting in all bolts tightened to the desired target stress after the single pass operation is complete.

Utilizing the DuraSquirt DTI Single Pass Flange System, repeatable and accurate flange bolt installation is achieved 70% faster than ASME PCC-1 Legacy multi-pass cross pattern tightening (results from independent U of H evaluation). With 75% fewer movements by the installers (leading to increased safety), repeatable and accurate tension is achieved with minimal training and limited experience, without relying on inaccurate torque measurements producing consistent, leak-free connections. 

DuraSquirt DTI Single Pass Flange System
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Pipe Diameter Flange Rating Quantity Per Kit Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
3 300# 8 3/4 0.79 1.4360 0.3540 WLOD3000300 5-7 Working Days $88.58459/SET SET
4 300# 8 3/4 0.79 1.4360 0.3540 WLOD3000400 5-7 Working Days $83.75209/SET SET
6 300# 12 3/4 0.79 1.4360 0.3540 WLOD3000600 5-7 Working Days $125.62814/SET SET
8 300# 12 7/8 0.9210 1.7180 0.3540 WLOD3000800 5-7 Working Days $159.12898/SET SET
10 300# 16 1 1.0520 1.9370 0.3540 WLOD3001000 5-7 Working Days $221.46566/SET SET
12 300# 16 1 1/8 1.1830 2.1870 0.3540 WLOD3001200 5-7 Working Days $234.50586/SET SET
14 300# 20 1 1/8 1.1830 2.1870 0.3540 WLOD3001400 5-7 Working Days $293.13233/SET SET
16 300# 20 1 1/4 1.3150 2.4370 0.3540 WLOD3001600 5-7 Working Days $326.63317/SET SET
18 300# 24 1 1/4 1.3150 2.4370 0.3540 WLOD3001800 5-7 Working Days $393.63484/SET SET
20 300# 24 1 1/4 1.3150 2.4370 0.3540 WLOD3002000 5-7 Working Days $393.63484/SET SET
3 600# 8 3/4 0.79 1.4360 0.3540 WLOD6000300 5-7 Working Days $83.75209/SET SET
4 600# 8 7/8 0.9210 1.7180 0.3540 WLOD6000400 5-7 Working Days $108.87772/SET SET
6 600# 12 1 1.0520 1.9370 0.3540 WLOD6000600 5-7 Working Days $159.12898/SET SET
8 600# 12 1 1/8 1.1830 2.1870 0.3540 WLOD6000800 5-7 Working Days $175.8794/SET SET
10 600# 16 1 1/4 1.3150 2.4370 0.3540 WLOD6001000 5-7 Working Days $326.63317/SET SET
12 600# 20 1 1/4 1.3150 2.4370 0.3540 WLOD6001200 5-7 Working Days $326.63317/SET SET
16 600# 20 1 1/2 1.5770 2.9370 0.3540 WLOD6001600 5-7 Working Days $385.25963/SET SET