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Recent content by rpeng

  1. rpeng

    Wood Piling to Continuous Footing Connection

    I am building a two story coastal home on timber 8x8 pilings. The blow count was inconsistent, between 6 and 20. A local engineer recommended using an extended concrete footing (width of 12", depth of 16" between the pilings with (4) x #5 rebar passing through the pilings. I have read on this...
  2. rpeng

    High Sodium Sulfate Pilot Test with Various Materials

    The system will treat process water from a diesel scrubber system. The process water will contain diesel PM, copious oxygen, ammonia nitrate, Sodium Sulfate Na2SO4, and Sodium Bisulfate NaHSO3. There should be minimum chlorides present.
  3. rpeng

    High Sodium Sulfate Pilot Test with Various Materials

    We are being asked to perform a 3 month pilot test to treat process water with 15% sodium sulfate, pH around 6, temperature around 95-110 deg F. The only equipment we have (to meet the deadline) has epoxy-coated, 1/4" plate, carbon-steel tanks, with 304L nozzles (flanged and threaded). There...
  4. rpeng

    HELISEP ULTRA 1000 model OWS

    I have heard the same complaint from many vessel operators. The only recommendation that seems to help is removing as much particulate matter from the bilge water prior to entering the membranes. Several stages of filtration may be required (perhaps a 20 um bag followed by a 5 um filter)...
  5. rpeng

    SS Coating to be Applied in the Field

    We don't plan on painting the exterior. We can probably power wash the surfaces, but sand-blasting is simply not going to happen. I spoke with Carboline and they recommend sand-blasting all surfaces to get an effective coating. I'm not sure that silane is effective on steel. Have you heard...
  6. rpeng

    SS Coating to be Applied in the Field

    I am looking to apply a coating/protectang on a 304L SS tank that is used to hold oily water in a 0-2% saline solution. There is some pitting present on the plate and welds after about 3 years usage. The temperature is approximately 10-30 deg C with atmospheric pressure and a pH between 6 and...
  7. rpeng

    How to get study grants?

    I have been the principal investigator on several SBIR's, I don't have a PhD, and our company has only 5 full time employees. It is possible, but you must be prepared for a ton of background work for a good chance at receiving a grant. I would start by finding a champion in the applicable...
  8. rpeng

    15 ppm bilge alarm / oil content monitor type

    I have not used the NAG Marine monitor, but I have extensive experience with Turner Designs monitors. I have evaluated and used many manufacturers and models and have found that fluorescence technology, while not perfect, is superior to scattering light equipment. You will pay several...
  9. rpeng

    Sealing metal before painting

    I am trying to determine the proper way to seal carbon steel members that are joined by intermittent welds. The steel is cold-rolled ASTM A36 and the final product is epoxy coated with a chemical resistant tank lining (2 coats no primer, 5-6 mils DFT). The final product will be used in an...
  10. rpeng

    AFFF Storage tanks

    Ledon, The material specifications for each class of ship can be different; however AFFF piping for all ship classes I am familiar with must be 90-10 (MIL-T-16420). Different tank materials can be approved depending on the size of tank and ship class. I would consult NAVSEA directly, and...
  11. rpeng

    Sea water organism that disposed of human waste?

    Certain natural strains of bacteria will degrade fecal matter to non-hazardous end-products (primarily CO2, water, and bacterial cells). These cultures are more plentiful in warmer waters and are less prevelant in colder climates (such as the Great Lakes). I would caution your Chief that fecal...
  12. rpeng

    Software Piracy

    I must confess that I am potentially guilty of, or at least complacent in, violating software property rights. After reading the ethical reasoning in this thread have forced me to evaluate my responsibility, and have decided to attempt bringing the company I work for into compliance (as I am in...
  13. rpeng

    The saga of Ed Turner

    MintJulep "His mistake was resigning. Had he stuck it out he might have had a shot at getting fired, in which case he would have had a much stronger case." I don't think that your assumption that sticking with the job would make a better legal case. If he had stayed, it could easily be argued...
  14. rpeng

    Repair of Leaking Fuel Oil Pipe

    My experience is for Marine environments, so vibration and accidental environmental spills are a major concern. All fuel piping is welded or flanged (with appropriate containment). As noted in threads above vibration isolators / expansion joints are a must.
  15. rpeng

    Going out on my own.

    I am contemplating the starting on my own as well. I am moonlighting with new clients to gain experience and highly recommend it. Try reading "Inside the Technical Consulting Business" by Harvey Kaye. The book is about 20 years old, but the advise is from an engineer and written in easy to...
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