HIP'ing of High Presssure Valve Bodies 1

[Angsi2]

Has anyone heard of High Pressure Isostatic Pressing being used a method of manufacturing valve bodies especially in duplex construction?

If so:
- names of reputable valve mnaufactuers capable of it will be appreciated, based on previous experience
- does HIP'ing take a longer manufacturing time compared to castings
- Does it cost more compared to castings, though I suspect it does.

Thanks in advance

 

[ione]

Perhaps you meant Hot Isostatic Pressing.

I have heard it was used for lining of valve bodies to face wear or corrosion issues, just applying a layer of corrosion-resistant material only where it was really required.

Do not know whether they have experiences with valve bodies, but I would give a shot to this.

http://www.bodycote.com/

 

[Angsi2]

ione, yes Hot Isostatic Pressing I meant. Thanks.

 

[bcd]

HIP is more epensive than casting as it involves both high temperature and high pressure during the cladding process. Casting valve bodies is just high temperature.

Pay close attention to the base material properties. The temperatures used in HIP will normally ruin any heat treatment or desired phase of the base material.

 

[SJones]

HIP is used for valve bodies, as evidenced by ASTM A988, but it will not be valve manufacturers undertaking the process, it will generally be subcontracted. For duplex SS, there are several schools of thought, for example, BP prefer HIP for duplex, an Australian operator prohibits HIP for duplex. BP reckon it is superior to castings and forgings, the Australian operator reckons that deleterious phases are more prevalent.

Who is right and how to prove it?



Steve Jones
Materials & Corrosion Engineer

http://www.oilandgaspeople.com/cv/11499664

http://www.linkedin.com/pub/8/83b/b04

 

[hsbcn]

You may find this thread useful:

http://www.eng-tips.com/viewthread.cfm?qid=268929&page=1

We've worked with Kitz on these, with good results.

Heather's focus: Alloy Valves Duplex Valves Super Duplex Valves Monel Valves Inconel Valves [link titanium-valves.com]Titanium Valves[/url] & 6 Moly Valves

 

[valveguru]

We regularly produce valve using the hipping process. It gives us very high quality parts, and forged equivalent materials properties. Often you will find that the mechanical strength of castings are are lower than that of forgings.

We buy components from Sadvik and BodyCote.

Lead time is a question of new/existing design, factory loads and designs. If you have a new part, castings require a pattern which needs to be made and qualified which can add months to a delivery cycle. Hipping uses air conditioning style ducting and no pattern. Lead times for hipping are based upon loads at the various shops. The largers diameter we have seen (autoclave diameter) is about 30".