Highlights

Our latest iteration of our Calculate software has included updates specified by ASME PCC-1 2022 as well as other general updates.

• Updates to pipe schedule data as per ASME B36.10, specifically some metric equivalent values have been updated to represent a better approximation of the imperial value. Minor changes also implemented as specified by ASME B16.5.
• Torque Tightening patterns have been updated and aligned with ASME PCC-1 2022.
• Tension Tightening patterns have been updated and aligned with ASME PCC-1 2022.
• An alternate Tension Tightening procedure has been implemented as specified by ASME PCC-1 2022 and is detailed below.

Changes implemented as part of the previous ASME PCC-1 2019 release are still valid and can be referenced here: ASME PCC-1 2019 Calculation Engine

ASME PCC-1 2022 Update

PCC-1 2022 Appendix Q Tightening Procedure

In ASME PCC-1 Appendix Q, section Q-4.5, details are provided with regards to tightening procedures for 100% and 50% tension cover and introduces two additional steps:

• Pass 1a, a first pass at 70% of assembly bolt load
• Pass 2, a final pass at the assembly load.

Thus, when selecting a tension coverage as per ‘PCC-1 2022 App Q’ option from the dropdown selection, these additional pass pressures will be generated as as shown in Figure 1:

Figure 1

Legacy Tightening Procedure

Traditionally, tensioning procedures give passes labelled A to D based on the selected coverage. 100% and 50% tensioning cover are most commonly used and when selected, pass pressures for the passes will be calculated and labelled accordingly, as shown in Figure 2:

Figure 2

ASME PCC-1 2022 Appendix Q Applied Load Multipliers

When a PCC-1 2022 App Q tightening procedure is selected, the additional steps Pass 1a and Pass 2 are available in the Calculate user interface as shown in Figure 1 and as part of the tightening procedure report.

ASME PCC-1 Appendix Q, section Q-4.4, makes reference to PVP Paper PVP2014-28685 for load loss factors. This paper presents Pass A and Pass B pressure multipliers to be used for calculating applied bolt loads which

have been renamed as ‘Pass 1b’ and ‘Pass 1c’ as stipulated in ASME PCC-1 Appendix Q.

Based on the workings in PVP2014-28685 – Tables 3&4 applied pressure multiplier calculations will only be available for:

• 100% and 50% tension cover only;
• ASME B16.5 & ASME B16.47 weld neck flanges from 3” to 48”;
• Flange materials with a Modulus of Elasticity between 195 GPa and 208 GPa. This range is based on ±3% of ASTM A105 Carbon Steel Modulus of Elasticity of 202 GPa;
• Imperial bolts
• Common bolt materials e.g. ASME A193-B7, ASME A320-L7;
• Spiral wound gaskets with inner and outer rings.

When a user selects a Tightening Procedure with PVP2014-28685 pressure multipliers, the PVPA and PVPB factors are sourced from Tables 3 and 4 of that paper.

The PVP2014-28685 – Tables 3&4 applied pressure multipliers can be used either with Legacy Tightening Procedure or PCC-1 2022 Appendix Q Tightening Procedure.

For extra information regarding the PVP2014-28685 – Tables 3&4 applied pressure multipliers and how they were determined, please review PVP2014-28685.

Legacy applied loads - multiplier

Tensioning loads can still be calculated using the ‘legacy’ method derived from the Length to Diameter ratio as given below:

This can be used in conjunction with the Appendix Q tensioning method where the additional passes will be incorporated as already highlighted or with the Legacy Tightening Procedure as previously shown in Figure 2. Please see Table 1 for 50% tension coverage example.

Table 1

Bug fixes and performance improvements

This release includes bug fixes and performance improvements intended to give you the best possible service and user experience.