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  1. Swedishrigpig

    Hazardous drain water on Clean Class Drillship. How to get rid of clean rain water?

    Just came out of the Shipyard with a brand new drillship and DNV has a Clean Class which basically means all rainwater goes into a tank with a 10m3/hr Oily Water Separator. This is of course not enough to handle the massive amount of rain and we are wondering if there is a legal way to deviate...
  2. Swedishrigpig

    Bearings. Can Outer Race rotatation in housing be acceptable?

    I am inspecting an Oilfield Triplex piston Mud pump and the Pinion shaft has two Self Aligning Roller Bearings (1 ea end). Approx. diam 460mm. Max clearance as per spec is 0,040-0,1092mm between housing and Bearing OD, I.E. no interference fit. Max Pinion speed 417 RPM During testing it was...
  3. Swedishrigpig

    ILO Rules for accommodation on newbuildt vessel

    Our brand new vessel just left the yard. According to ILO the bathrooms should have "Towel dryers". Our Client interprets this as the electrically heated version, while I interpret is as a Towel Rail where towels will dry without heat. I have never seen an electrical towel dryer on a ship or...
  4. Swedishrigpig

    Can I run an old Volvo truck (1947-1957) on palm oil

    Dear All Asked a few days ago on how to get a hold of Ethanol powered motorbike engines. Today I would like to know if I can run an old diesel engine on Palm oil (in Africa). It is my understanding that it might be difficult to do this in colder climates, but are there other challenges I might...
  5. Swedishrigpig

    Fuel Efficient Methanol 4 stroke engines (for quads)

    Dear all A friend of mine is looking for Motorbike engines that can be ran on methanol. Not sure what the biggest difference is between Petrol and Methanol four stroke engines. The guy is running a project in Africa and the people there can produce methanol whereas Petrol is horribly...
  6. Swedishrigpig

    Reverse Osmosis Water. Why so aggressive and what to do about it?

    Gents Our Ocean going vessel uses Reverse Osmosis to make drinking water out of Sea Water. Great machine, much less maintenance than the old Evaporator Distillers. However, although the water is very clean, it gets very aggressive and corrodes Steel Pipes, Aluminium coolers, Coffee machines...
  7. Swedishrigpig

    What thread for a 23000 psi pressure gauge?

    Gents I am about to order a new pressure gauge for our hydrailc bolt stretching tool. The thread is 14 TPI OD 0.82" (20.9mm) but at the end there is a smaller cylindrical bit with an o-ring around it measuring: OD 0.23" (6.0mm) Length 0.19" (4.8 mm) This to me is an G 1/2" or 1/2" BSPP, but...
  8. Swedishrigpig

    How to get Butterfly valves to match flange types

    Gents I am looking through my vessels pipe line drawings. The valve I need should be: VA BUTTERFLY 150 PSIG LUG TYPE DI-BODY ALUM BRZ. DISC. 316 STEM BUNA-N SEAT NOM SIZE 4” But when I look at the valve installed (original one) the data looks different: The sign says: Tag No: WSC 501 Fig: 2...
  9. Swedishrigpig

    When to replace my hydraulic fluid?

    Gents My hydraulic steering system for the Thruster (marine propulsion) is now 5 years old. The technical department tells me to replace the oil Mobil DTE 25. The oil analysis reports are always good and we use (apart from the designed filters) a CJC 3 micron offline filtering unit and a...
  10. Swedishrigpig

    Ball Bearings Sealed or open bearings 6313 C3

    I ordered 6313 C3 bearings (open ones) for our electric motor. The motor is vertically mounted and drives an hydraulic pump. The motor runs 24/7 but on very low loads. Our dear purchase department has supplied us with the 2Z verison, i.e shielded or "sealed" otherwise same specs. My questions...
  11. Swedishrigpig

    Good Engineering books (metric)

    I am looking for a good European Engineering book. I have a few good American ones, but they are not metric and most of the equipment we use are made in Europe. I could use (all metric or Europeean): Marine Engineering book. General Engineering/ Machinery book Piping Handbook Welding Handbook...
  12. Swedishrigpig

    Hydraulic oil Analysis, What is UCS? Thermal degradation?

    We have a case of thermal degradation on our offshore vessel. The oil is getting dark, it smells sour and foul, it eats the plastic plates of our Alfa Laval Emmie centrifugal purifier, the components inside have a golden lacquer layer on them. Yet our oil reports all come back as "fit for...
  13. Swedishrigpig

    Zink anodes in Seawater coolers: Will PTFE tape ruin the job?

    The old boys always say "Don't ever use PTFE tape (Teflon thread tape) on the threads of the bronze plug that holds the Zink anode pencil. It will isolate the contact between the Zink via the bronze holder to the casing of the cooler. But surely the Seawater is sufficiently conductive to do the...
  14. Swedishrigpig

    Crane and davit wire rope changing intervals

    Gents Our off shore vessel is aproaching five years since built. The deck crane wire ropes looks fine, the cranes have been load tested yearly. Do we still have to replace all the wire rope (that are five years old)? We use ABS class. I assume the same applies for lifeboat/ rescue boat davit...
  15. Swedishrigpig

    Oily waste water filters.

    Gents Not sure I am in the correct forum. We are an offshore vessel trying to clean our Oily bilge waste water. We are using a Hamworthy OWS HS 5 (Oily water Separator) and it does separate the oil from the water, but since there is no fine filter in this unit (like the old units) therefore...
  16. Swedishrigpig

    What CAD program is best for pipe drawings for amateurs

    Gents I would like to learn how to make 3D drawings for pipe work. What we usually use is Carbon steel pipe (150 Psi)for marine use. But we also started using FRP (Fibre Reinforced Plastic) by Conley. I am a beginner with Cad programs and I wonder what would be the best option. Auto CAD...
  17. Swedishrigpig

    How does a spring washer work?

    Is it the tension of the washer that nips the threads that stops the nut from unscrewing itself, or is it the sharp edge of the spring washer that digs into the underside of the nut and base surface that holds it? Is it then wrong to use a flat washer under the springwasher? It would then stop...
  18. Swedishrigpig

    Is painting over flash rust ok?

    On our ship we use a company that uses hydroblast (UHP) Ultra Hight Pressure guns. The result if fantastic, very fast and effective. However after just a few hours or less, the metal clean surface goes light brown, I believe it is called "flash rust" and the company says it is perfectly fine to...
  19. Swedishrigpig

    Oily Water Separator Fine Filter

    Gents We are using a Hamworthy OWS HS 5 and it does separate the oil from the water, but since there is no fine filter in this unit (like the old units) therefore, although there is no oil in the water, it is not clean enough to pass the 15 ppm sensor, due to rust or carbon particles. My...
  20. Swedishrigpig

    How to order v-belts

    Gents I need to order some Europeean V-belts in the USA. The purchase department cant locate these belts, in spite of pictures with the model and manufacturer clearly visible. Gates Super HC SPA 1450 and Pirelli Equi-Match SPA 865 How can I explain better what I need so that they can easily...

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