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  1. Milkboy

    Carbon Graphite Chemical Compatibility

    Hello Group I can find much data on the compatibility of pumped product with Silicon Carbides (Sintered or Reaction Bonded) and Tungsten Carbide (Nickel or Cobalt bound) and the pH ranges of each. I'm having trouble sourcing similar data for 'Carbon' Do resin and antimony carbons have pH...
  2. Milkboy

    Pumping a fluid that is under vacuum?

    Hello group Im looking a repeat seal problem where the shaft sleeve has contacted with the bore of the seal plate. The contact area is at about "2 oclock" So it seems the shaft has move up and over a touch. I have been told that the pumps operate at vacuum. This is where Im getting a bit lost...
  3. Milkboy

    Sealing Brine at 80¦C (176¦F)

    Hello there Group Im looking for advice, suggestions, URLs on material of contruction selection for a pump and mechanical seal which will see Brine (25% w/w) at 80°C (176°F) I have a rule of thumb in my head that says >30°C (86°F) on seawater then Titanium is used. However, I dont know where I...
  4. Milkboy

    Cartridge Seal and Seal System (pot) to ATEX

    Hey group I'm trying to nail down the application of ATEX to mechanical seal so I would appreciate some thoughts. Cartridge Seal on pump in Zone 1 Plan 53 Thermosyphon Seal system Now, to comply with ATEX I have heard much conflicting information. Source W says to monitor the fluid in the...
  5. Milkboy

    Fines in the Barrier System

    Hey Group I have a plan 54 system using 'reclaimed' condensate Temp is <40°C so we have seen no trouble there The question is, it is thought the condensate could have solid/fines in it so a 12 micron filter is used on each system to protect the seal barrier seeing any solids. These filters...
  6. Milkboy

    Sealing Condensate / Condensate Barrier

    Hey Group As I understand it hot water / condensate has a low lubricity and therefore we usually see Carbon v SiC faces in a Mechanical seal. Now then, if you were to use cooled 'recliamed' condensate and a barrier fluid and was sealing against a product which required SiC v SiC, would a...
  7. Milkboy

    Sintered v Reaction (SiC Seal Faces)

    Hey group I'm looking for the lowdown on Sintered and Reaction Bonded SiC Mechanical Seal Faces. Typical Performance differences (temp, pressure, resistance to chemicals etc, strength) Ballpark cost comparisons Can one be shrink fitted and the other not??? Any advice or URLs appreciated...
  8. Milkboy

    Boiler Feed Pump and a Worn Out Seal Face

    Hello Group I have got a cartridge seal from a boiler feed application. 356°F (180°C) at 246 Psi (17 BarG) with a cooled chamber and the seal also has a cooled seat. What I have is an Antimony impregnated Carbon versus a Sintered Silcon Carbide equiped mechanical seal. The Carbon face has...
  9. Milkboy

    L10 Bearing Life and Mech Seals

    Hey Group Bearing manfs have L10 for bearings Why would mech seal manfs not do the same? TIA - Milkboy
  10. Milkboy

    Boiler Feed Pump

    Hey there Group In boiler feed apps the metal of the mech seal often get a red/brown coating on it. Is this Ferrite? Im looking for info on the source of the ferrite in these apps and how it can be dealt with (mag filters? and the like) Is the ferrite suspended in the water or is it...
  11. Milkboy

    Safety Integrity Level of Mech Seals?

    Do Safety Integrity Levels apply to mech seals ? AFAIK it usually electro, instruments etc Unless someone can advise me differently Thanks - Milkboy
  12. Milkboy

    Tweedy Bread Mixer Seal

    Hi group Bread Mixer seal 80mm shaft SiC v Rulon Faces FDA Viton Component Pusher Type Any experience anyone. Is it an 'off the shelf' seal made by one of the majors then supplied by Tweedy Tweedy can seal to help me as I have no serial number for the machine as it was damaged long ago...
  13. Milkboy

    Seal Faces and Scale

    Hey Group If you are sealing a fluid with a quantity of disolved solids and the Calcium Carbonate has a tendancy to scale, would you expect scale to form on the actual sliding area of the seal faces OR Is hang up more of concern when it comes to scaling? TIA - Milkboy
  14. Milkboy

    Elbows and Suction

    Hi Group I was recently searching for info on Suction Lift pumping aswell as getting good advice from engtips :o) One bit of Info I found was regarding the suction line and I cant find it again. I would like to know the recommended min distance of straight pipe at a pump suction before there...
  15. Milkboy

    Suction Lift Pumping

    Hello Group I have a query regarding suction lift pumping The pump is a Double Suction Centrifugal with 2x Mech seals. The Pump is primed with a system which fills the pump casing with water ready for pump start up. So the pump is full and it beings to lift the water from the reservoir. Where...
  16. Milkboy

    Venting the Stuffing Box

    Hey Group If you have a suction lift pump or a pump which has a vac during start up, you would expect to get some air trapped in the box. Am I correct with this? Now if the pump was vertical, you could use a Plan 13 to keep the seal faces wetted and remove any trapped air. If the pump with...
  17. Milkboy

    Mech Seal Life Guarantees?

    If you are asked for a Mech Seal to have a guaranteed 2 year life what would you say? What would you cover in the guarantee? Dry running would not be covered surely. Any experience of a 'guaranteed' seal failing and having trouble with the end user with regards to root causes? TIA - Milkboy
  18. Milkboy

    Carbon Faces on Abrasives

    Hello Group Any thoughts / experiences on running Carbon v SiC on seawater with 'abrasives' Are there guidelines/limits of, say, soilds size, percentage, SG etc where you use a carbon face below those limits ? I have seen a seawater seal selected as being Antimony Carbon v SiC, but the job in...
  19. Milkboy

    Water Economiser (AES Flowtru)

    Hey Any experiences of the AES Flowtru out there ? How does it work? Does it reduce water consumption? How is the seal protected when using less water? TIA - Milkboy
  20. Milkboy

    Double Seal Piping Plan Query

    Hey there Double (Dual) Pressurised Mechanical Seal which the Barrier Fluid is supplied by another Centrifugal Pump which goes to Barrier In connection. Barrier Out connection has a needle valve and a gauge to throttle the pressure to get a Barrier of 2 Bar above box. The barrier fluid then...

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