Bolt Length Calculation for Standard Flange-Gasket-Flange

The calculation of bolts will be triggered by the presence of a connection type starting with F (flange face) or L (lap joint), and will be completed by a second occurrence of such a connection type.

The calculation steps are:

1. At the first component, go to the CATREF, and find the BTSE name assigned in the BLRF for the appropriate p-point of the component. Store this reference (BTSE1).

2. Go to the second component. If its connection type starts with G (a gasket), get its P1 - P2 distance, and go to the next component.

3. If its connection type starts with F or L, go to the CATREF, and find the BTSE name assigned in the BLRF for the appropriate p-point of the component. Store this reference (BTSE2).

4. Check for matching member counts of BTSE1 and BTSE2 (excluding jacking bolts, that is with BTYP JACK).

5. For each bolt in the set, get the Bolt Points with corresponding NUMBer.

6. Check for matching BDIA values.

7. Add the two values of BTHK (bolted flange thickness) together.

8. Add the gasket thickness (if found).

9. Select the bolt from the Specification and obtain its standard (rounded up) length. Refer to Bolts SHOP Flag.

The following error conditions generate an error message, output a material description of ‘‘Bolts undefined" for that joint (with zero item code, size and quantity), and continue detailing.

• No valid BOLTREF of CATREF for the second flange

• Unequal number of members for BTSE1 and BTSE2, excluding jacking bolts

• Mismatch in BDIA attributes between equivalent members of BTSE1 and BTSE2