Reporting the Bolt and Nut Quantity for Fittings
The Bolt Nut Selection file, piping_bolt_nut_select.csv, specifies the total number of bolts and nuts required for the main fitting and for the flanges mated to the main fitting. A summary of all bolts and nuts required for the pipeline appears at the end of the Pipeline Network report.
• In a fitting with two mated flanges, the quantity of bolts and nuts that appears in the report depends on only the bolt nut code assigned to the main fitting. A typical valve fitting with mated flanges is shown in the next figure.
1. Flange fitting
2. Main fitting
3. Flange fitting
• For 2 mated flanges, the total quantity of bolts and nuts in the report is the sum of half the quantity from both the flanges. For example, in a mated flange, 1 flange requires 6 bolts and the other flange requires 8 bolts. The total quantity reported in this case is 7. A typical pair of mated flanges is shown in the next figure.
1. Flange fitting
2. Flange fitting
• In a group fitting, the quantity of bolts and nuts in the report is based on the following rules:
◦ For the two main fittings, which are located at each end of the group, the quantity in the Bolt Nut Master Catalog file (bolt_nut_mcat.ptd) is multiplied by a factor of 0.75.
◦ For the main fittings, which are not located at the ends of the group, the quantity in the Bolt Nut Master Catalog file (bolt_nut_mcat.ptd) is multiplied by a factor of 0.50.
◦ The end flanges of the group fitting are not considered to be main fittings. They have lower priority, and the quantity of bolts and nuts is not included in the report.
A group fitting with three main fittings (globe valves) and two flanges at the ends of the group is shown in the next figure
1. Flange fitting
2. Main fitting
3. Main fitting
4. Main fitting
5. Flange fitting
Bolt nut codes for the group fitting in the figure above are assigned as shown in the following table:
Fitting | Bolt_Nut_Code | Actual Quantity | Reported Quantity |
|---|---|---|---|
Main Fitting (2) (End1 of group) | CFA | 16 | 0.75 X 16 = 12 |
Main Fitting (3) (Middle of group) | CFA | 16 | 0.50 X 16 = 8 |
Main Fitting (4) (End2 of group) | CFB | 12 | 0.75 x 12 = 8 |
Flange Fitting (1) (End1) | CFF | 8 | 0 |
Flange Fitting (5) (End2) | CFF | 6 | 0 |
In the Bolt Nut Summary report, the quantities reported in the Material Information area follow.
QTY | SIZE | STOCKNO | MCCS | DESCRIPTION |
|---|---|---|---|---|
20 | CFA | |||
8 | CFB |