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  • Users: garfio
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  1. garfio

    Definition of "user" under code

    Hi I am trying to understand the responsibility of my EPC firm with respect to the obligations in the code. I found the use of the word "user" to define obligations, and looking at appendix NN, there is a sort of definition and even examples of how to interpret the obligations. However, it...
  2. garfio

    Discharge pipe for relief valves

    A relief valve is installed at the discharge of an amine pump (set at approx. 1,000 psig) and the valve discharges to the pump suction line (approx. 50 psig). The discharge piping has been assembled in such a way that the line raises a few feet before connecting to the suction line on the top...
  3. garfio

    Waste heat recovery from turbine exhaust - multiple turbines

    A client wants to recover heat from the exhaust of two turbines to heat oil. The units drive compressors and will be normally running at a high load rate, although there are chances that only 1 turbine be running. Normally I've seen one WHRU per turbine, but there is a suggestion to use a...
  4. garfio

    Solution for turbine nozzle load restrictions

    Turbine nozzles per NEMA SM-23 have very low allowable loads. Although the preferred solution is to obtain enough flexibility with the piping, I believe that there are cases where this solution is not possible, and expansion joints have to be used. I would like to here people's experience...
  5. garfio

    Allowable loads for turbines - NEMA SM-23

    In order to satisfy NEMA SM-23 requirements for maximum external loads on turbines, should the NEMA loads be compared to the piping loads under "normal" operating conditions, or should they be also satisfied under occasional loads scenario, for example, PSV relief? Thanks
  6. garfio

    Design conditions for pipe before PSV

    I am not sure that this is the right forum for my question, so direct me to the right one if its not. I have a steam pressure reducing stations that includes a block valve, an emergency valve a pressure control valve and a safety valve. The pipe segment between the discharge of the pressure...
  7. garfio

    Selection of low friction supports

    I would like some guidance regarding the selection of low friction supports: I need supports for a steam lines (800 F, from 6" to 20") to be mounted on a pipe rack, and I am looking at rollers and shoes with low-friction pads. I found that for both types, the manufacturers recommend friction...
  8. garfio

    Piping Loads on steam turbine

    I need to check the loads imposed by piping to a steam turbine. The turbine manufacturer has provided the allowable loads per NEMA SM-23. A quick look to these allowable loads shows that one of the constraints is that the resultant force at the turbine inlet shall not exceed 500 lbs. Being a...
  9. garfio

    Questions for Pipepak users

    Algor pipepak tables includes the flange width and valve length, but it seems that neither are used by the program: - Flanges are considered a weight applied in the node. - Valve lengths are drawn based on the length defined for the segment. Anybody knows if the program uses the tabulated...
  10. garfio

    Modeling anchor points in pipe racks

    I would like to know what is the common practice followed in modeling anchors located on pipe racks: Are the anchors normally model with a stiffness less than "rigid" to represent the deflection that the structural steel will suffer under the loads or they are modeled as "rigid"? What values of...
  11. garfio

    piping for superheated steam

    I have 3 interrelated questions about superheated steam piping: 1) Good piping practice for saturated steam is to connect the branches on top of the headers. However, considering that in superheated steam lines there is not condensate, is this also a recommended practice or connections can be...
  12. garfio

    When to do a dynamic stress analysis?

    I've seen many recommendations about when a formal stress analysis should be done (based on line size, temperature, etc), however, I still haven't seen any practical recommendations about when a dynamic analysis should be included. Could any of the many experienced engineers in this forum give...
  13. garfio

    Contradiction in the use of draft curtains (IBC, IFC) ?

    It seems to be a contradiction in the requirement of draft curtains between IBC and codes. IBC 2006 states the requirement of draft curtains in 910.3.5 and table 910.3. So, a high-piled Group S-1 with type III commodity, area =30,000 ft2 and no ESFR sprinklers (only normal ones)will require...
  14. garfio

    Occupancy Classfication for pellet storage

    I am back reviewing the occupancy classification of a building that will store bulk wood pellets. Pellets will be loaded to trucks, but the main purpose of the building (and a great part of its area), is for storage. I see as a first and obvious possibility of classification, Group S-1, which...
  15. garfio

    Sprinklers for storage building

    I am trying to do a preliminary sizing of a sprinkler system and need some assistance to clarify what seems to me unclear in NFPA standards. The area to sprinkler is a non-combustible storage building for bulk (loose) storage of wood pellets. The pile will be higher than 12 ft. The area is...
  16. garfio

    Bulk storage of wood pellets

    We want to store a large amount of wood pellets in bulk, inside a 30,000 sq ft building and would like some input about how to interpret IBC 2006: a) Is bulk storage at heights above 12 ft considered high-pile storage? This may be a dumb question but when reviewing the requirements in IBC...
  17. garfio

    Suggestion on how to handle bulk shredded paper

    I am working on a project that will use shredded paper and wood chips to make cubes/pellets. I have the following two questions that I hope people in the paper industry can answer. 1) The process requires shredding paper to sizes < 1/2". Paper comes in pre-shredded to sizes < 3". What would be...
  18. garfio

    API 650 Appendix P still with errors?

    I've been checking the last versions of API 650 Appendix P because I found some discrepancies with the stress factors used to calculate nozzle stresses on the alternative method (P.3). Even in Addenda 1 of the 11th edition (2008), I found that: a) The labels for lines in Figures P-8A to P-8F...
  19. garfio

    Pipe shoes for stainless steel piping

    I would like to have your opinion about the type of shoe that is more convenient/economic for stainless steel 304 hot pipe (2" to 12", up to 250°F, Sch 10S) with insulation. I have been presented with the following options: a) SS "wear plate" plus CS shoe welded to wear plate b) SS "T" shoe...
  20. garfio

    Pressure relieving devices, ASME and API-ASME codes

    While reviewing the requirements for pressure relieving devices for pressure vessels in LPG service, I came across NFPA N° 58-Liquefied Petroleum Gas Code, that in 5.2.1.1 allows tanks under DOT regulations, ASME BPVC Section VIII or API-ASME Code for Unfired Pressure Vessels for Petroleum...

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