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  1. rothrock

    304L coated pipe buried in tidal water zone

    Water test results: Chlorides per EPA300.0 = 605 mg/L pH = 7.0 Conductivity = 0.31S/m If the exterior, i.e. anodes outide of pipe, CP system has brought the pipe potential up to the protective criteria of -850 mV relative to Cu/CuS04, does that also mean that the interior surface of the pipe...
  2. rothrock

    304L coated pipe buried in tidal water zone

    Thanks Metalguy and Stanweld, The system will be cathodically protected. We are waiting for some analysis of the chloride content of the water. It appears the water is mostly freshwater from the surface. For what its worth the field guys did a taste test and could not taste any salt. I'll post...
  3. rothrock

    304L Passivation

    I once read that stainless steel naturally passivates and that chemical passivation is more cosmetic than necessay to develop a passive layer. Is this true? If a 304L pipe has been exposed internally to salt water and then the saltwater removed and the pipe is refilled with jet fuel, will any...
  4. rothrock

    SS Anchor Bolts and Galvanized Base Plates

    A piping system design in a near marine tropical environment uses galvanized steel supports bolted to concrete foundations with stainless steel anchor bolts (ASTM A192 gr. B8). The engineer is now concerned about dissimilar metal corrosion and wants the contact areas between the two metals...
  5. rothrock

    304L coated pipe buried in tidal water zone

    We are installing 14" diameter fuel distribution pipe with a PE coating for an air base. The trenches are dug deep enough that prior to back fill tide influenced brackish groundwater can submerge the pipe. The owner has told us that allowing the brackish water to come in to contact with...
  6. rothrock

    Stainless Steel Pipe

    If the pipe was specified as ASTM A312, the specification may be at fault. Here is a link to a very informative court decision: http://www.uscfc.uscourts.gov/Opinions/Horn/98/Mortenson.htm In the decision it states: "ASTM A312 does not expressly state or specify requirements for the...
  7. rothrock

    psv's, drains, vents-common outlet piping system

    Collection of most fuel discharges from drains and thermal relief valves is standard in Military Type III Hydrant Fueling Systems. The fuel is collected in a common line and sent to a Product Recovery Tank. It can then be pumped back to the pumphouse for filtering and returned to fuel storage...
  8. rothrock

    DFM Fuel Oil Viscosity Chart Needed

    I don't have an internet site, but I purchased a copy of "Handbook of Aviation Fuel Properties" Document No. 530, by Coordinating Research Council. I got my copy from Gammon Techinical Products, Inc., 732-223-4600.
  9. rothrock

    Any comments on Piping Stress Analysis Software?

    I have used Caepipe since it first came out. It has served us well and is easy to use. They used to have a training course taught by a B31 code committee member and the Caepipe staff. I assume they still offer that. I also have used Autopipe for a couple of projects. I found Caepipe easier and...
  10. rothrock

    Fluid Bulk Modulus

    You might try to get a copy of "Handbook of Aviation Fuel Properties"; published by Coordinating Research Council, Inc. I got my copy thru Gammon Technical Products Inc. (732)-223-1600 Includes Bulk Modulus for JP-4, Jet A, Jet A-1, Jet B JP-5 and JP-8 over the range of 0 to 100 deg...
  11. rothrock

    Hot Allowable

    I use Caepipe from SST (www.sstusa.com)and A335 Gr. P11 properties are included in their library of materials for B31.1 code. It is a simple matter to select the Pipe material from the library and all the code properties for that material are automatically used in the stress analysis. (A...
  12. rothrock

    QUICKPEN PIPING DESIGNER 3D

    Frank, QP3D comes with a quik menu to insert structural shapes. They are ture 3D solids in AutoCAD. You can edit them just like any other solid. The program is not a structural program, so no other structural aids are provided. Since QP3D is an add in to AutoCAD, anything AutoCAD can do is...
  13. rothrock

    QUICKPEN PIPING DESIGNER 3D

    I have been using PD3D for the last 18 months (in it's various forms). It works great and is very customizable. File sizes are smaller, but a detailed 6 pump pumphouse will still take time to regen in AutoCAD. I haven't found a better alternative. I still have problems with their BOM feature...

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