pressure calculations for pipe line components and equipment

Application Window

Outstanding Core Products and Services

  • 1

    Software Products

    The engineering software products are based on a solid framework. Its architecture is clean and simple for quick implementation & comes loaded with a powerful validation of engineering formula's and scaled drawings for dimension validation. We concentrate on ASME and EN pressure calculations.
  • 2

    Consultancy Services

    The technical issues or challenges are sometimes beyond the regular engineering scope. Our engineering consultancy will help you to overcome the possible hurdles. The consultancy includes handling of engineering information, alternative engineering solutions, up to and including end of life assessment according for example API 579.
  • 3

    Engineering Services

    The engineering performed at Red-Bag consist usually the more difficult items such as custom flange design or unusual openings in shells or heads. The FEM analysis is also part of the services. Other engineering services include bulk calculation such as 8000 different scenarios for branch connections.

Many of us have the impression that the bolt stress will go up when a flange pair in a pipe system is pressurized after assembly.

However the opposite is true. The video demonstrates

- first a fully rigid flange in which case the bolt load indeed will go up

- but the second part of the video show the real flange behavior: the flange facing will rotate around the gasket and the bolt load will go down.

In the video the left side is the medium or internal side of the flange. The top two horizontal pieces are only hinges. The bottom horizontal piece is the gasket. The vertical top and bottom part are the (weld)neck of the flanges. The smaller horizontal parts at the right (with my thumbs) are the flange rings. The blue elastic bands are the bolts and brown ones are attached to simulate the flexibility between the flange ring and neck.

This bolt unloading phenomena is frequently misunderstood. The bolted flange assembly does not only have a force balance but also a moment balance. The result is that many bolt assembly forces, calculated according the Taylor Forge method, are perhaps too low.