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  • Users: donf
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  1. donf

    Valve packing access

    I'm looking for an Industry standard/specification/guideline/practice (U.S.) that addresses access to valve packing adjustment for actuated quarter-turn valves. I seem to recall seeing such a standard some years ago (I think it was an ASTM Specification), but have been unable to find it. The...
  2. donf

    Hot Pig?

    I have an underground pipeline in which the contents may be frozen. Not at liberty to divulge the contents, but product starts to gel at 50F. Pipe size is NPS 3. Length in excess of two miles. I know very little about pigging. Does anyone know if there's such a thing as a heated pig? I could...
  3. donf

    Ball valve stem packing access

    A few months ago, I ran across an ASTM? spec that addresses ball valve stem packing access. Unfortunately, I misplaced the reference and can't seem to find it again. I searched this forum, and googled "ASTM packing access", with no luck. Not looking for a particular packing material. Any help...
  4. donf

    Replacement for Crane/Resistoflex Clamp Valve

    I have several Crane/Resistoflex clamp valves that may need replacing or rebuilding soon. I just found out that Crane is no longer providing these valves, and spare parts are not available either. The valves are NPS 4 class 150, and the application requires a PTFE sleeve. The Crane Clamp valve...
  5. donf

    Removing water after hydrotest

    I'm looking for experience, suggetions, advice on dehydrating a tubing system after a hydrostatic pressure test (I did search this forum. Found some quite spirited discussions on testing - but not what I'm looking for). Here are the particulars: Code in effect = ASME B31.3 Process Fluid =...
  6. donf

    Maximum socket weld gap?

    I'm looking for "rules" or a least guidelines for the maximum allowable gap between the end of a pipe and bottom of the socket in a socket weld connection. Another way of asking the question: What is the required MINIMUM insertion length? I've looked at ASME B16.11 and B31.3. If it's in there I...
  7. donf

    Special Characters Filter MS Access

    I have an Access 2000 database with a number of records with "xxx?" in one of the fields. I'm trying to filter for the records that contain only a ? at the end. Since "?" is a special character, how do I contruct the filter to treat the "?" as text? Many Thanks, Donf p.s. I did spend a half...
  8. donf

    Pressure Relieving Pipe Plug

    Some years ago, I saw a line of NPT pipe plugs and caps that had the ability to indicate stored pressure (via a small leak or hiss), before the plug or cap was fully disengaged. Sort of like the cap on a carbonated beverage bottle. As I remember, the plug had a groove machined on the face (small...
  9. donf

    Reusing "old" PP lined pipe?

    I’m replacing a chemical storage tank that has a number of polypropylene lined carbon steel pipe lines connected to it. The plan is to disconnect as much pipe as needed to allow removal of the old tank, erecting the new tank, then reconnecting the piping. I do anticipate providing a few new...
  10. donf

    Unusual shaped ball

    Greetings, I'm looking for a source for a ball valve (class 150 flanged, metal body, pTFE seats) with an unusual shaped ball. Instead of being a constant diameter sphere, the ball has two recessed circular areas located 90 degreees to the ball bore. In the closed position - the exposed...
  11. donf

    Low cracking pressure check valve

    I'm looking for a source for spring loaded check valves with a cracking pressure less than 5" WC (0.18 psi) for nitrogen service. 316SS/PTFE construction will suffice. Temperature is 0 - 40C. Sizes could range from 1/4" tubing to NPS 2 Cl 150 flanged. So far the lowest CP I've found is 1/3 psi...
  12. donf

    Multi-turn ball valve

    I'm looking for a source for an inline gear reducer that would enable me to convert a quarter turn ball valve into a multi-turn version. Right angle gear operators are common for this application, but I need the inline style (Input and output shafts on the same centerline) Valves are in the NPS...
  13. donf

    Black Iron?

    Frequently, I hear or see the misnomer "black iron" used to describe carbon steel pipe. Can anyone offer any insight, history or technical basis for this term? Thank you, Donf
  14. donf

    Relative cost of piping materials

    I'm looking for a website that lists the RELATIVE costs of piping materials typically used in a chemical plant. I was recently made aware of the volatilty of the metals market when I received a quote for a significant amount of AL6XN pipe/fittings - and the quote was good for only 24 hours...
  15. donf

    Malleable Iron vs. Forged Steel

    I'm asking for opinions, preferences, advice, esperience, etc. regarding the use of ASTM A197, B16.3 class 150 malleable iron versus ASTM A105, B16.11 class 2000/3000 forged steel threaded pipe fittings for NPS 2 and smaller, 150 psi and less saturated steam service with a desired life of 25...

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