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 0.7900 1.4360 0.3540 WLOD3000300 5-7 Working Days $88.58459/SET SET
4 300# 8 3/4 0.7900 1.4360 0.3540 WLOD3000400 5-7 Working Days $83.75209/SET SET
6 300# 12 3/4 0.7900 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 0.7900 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