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. 

Application DataDuraSquirt Single Pass Flange System

DuraSquirt Single Pass Flange Washers are suitable for use with:
Stud Bolts Grades A193 B7 and A320 L7
Gaskets Spiral Wound Gaskets with Inner and Outer Rings, Camprofile Gaskets with Outer Rings, or Camprofile Gaskets with Inner and Outer Rings 
Flange Material A105 Carbon Steel
Flange Types Raised Face Flanges: Weld Neck, Socket Weld, Threaded, and Blind Flanges

DuraSquirt Single Pass Flange System
Each DTI is laser marked, detailing the flange diameter, class, and its position number, within the ring. There is a large number for installation crews to position all DTI's around the flange in numerical order, and smaller text along the OD for inspectors, to confirm proper placement.

Advantages

  1. 1. DTI system is significantly faster than the ASME PCC-1 Legacy method by 60 to 70 percent.
  2. 2. DTI system reliably produces a leak free connection upon startup.
  3. 3. DTI system requires 75% fewer movements by the bolting operators.
  4. 4. DTI system does not require the use of precision torques as compared to ASME PCC-1 Legacy technique.
  5. 5. DTI system reliably yield these results with operators who have received minimal training and have limited experience with bolted flange joint assemblies.
  6. Above data independently verified by the University of Houston.

DuraSquirt Single Pass Flange System

DuraSquirt Single Pass Flange System

DuraSquirt Single Pass Flange System

DuraSquirt Single Pass Flange System

DuraSquirt Single Pass Flange System

DuraSquirt Single Pass Flange System

Installation InstructionsDuraSquirt Single Pass Flange System

Each set of DuraSquirt Single Pass Flange Washers contains color installation instructions, printed on long lasting laminated stock. Shown here are the installation instructions as provided for the 10" 300# DuraSquirt Single Pass Flange System. Steps 1 and 2 can be more efficiently completed by utilizing a DuraSquirt DTI Single Pass Torque Snug Kit in place of a torque wrench. 

DuraSquirt Single Pass Flange System Installation Instructions Page 1

DuraSquirt Single Pass Flange System Installation Instructions Page 1

Dimensional DataDuraSquirt Single Pass Flange System

DuraSquirt DTI Single Pass Flange Washer Dimensions

Using a longer stud bolt to accomodate the DuraSquirt Washer may not be necessary. The uncompressed thickness of the DuraSquirt Flange Washer is 0.354", and should fall within tolerance to still allow acceptable thread protrusion from the nuts on either side of the stud bolt. However, if desired, a stud bolt 1/4" longer may be used to accommodate the added thickness of the washer. When an additional F436 washer is used on the flange opposite the DuraSquirt washer, a stud bolt 1/2" longer should be used.

Pipe Diameter Flange Rating Inside Diameter Outside Diameter Thickness Bolt Diameter Washers per Kit
3 300# 0.7900 1.4360 0.3540 3/4 8
4 300# 0.7900 1.4360 0.3540 3/4 8
6 300# 0.7900 1.4360 0.3540 3/4 12
8 300# 0.9210 1.7180 0.3540 7/8 12
10 300# 1.0520 1.9370 0.3540 1 16
12 300# 1.1830 2.1870 0.3540 1 1/8 16
14 300# 1.1830 2.1870 0.3540 1 1/8 20
16 300# 1.3150 2.4370 0.3540 1 1/4 20
18 300# 1.3150 2.4370 0.3540 1 1/4 24
20 300# 1.3150 2.4370 0.3540 1 1/4 24
3 600# 0.7900 1.4360 0.3540 3/4 8
4 600# 0.9210 1.7180 0.3540 7/8 8
6 600# 1.0520 1.9370 0.3540 1 12
8 600# 1.1830 2.1870 0.3540 1 1/8 12
10 600# 1.3150 2.4370 0.3540 1 1/4 16
12 600# 1.3150 2.4370 0.3540 1 1/4 20
16 600# 1.5770 2.9370 0.3540 1 1/2 20
  1. All dimensions in inches.
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