Good drive, useable for RAID.
Got total of 4x Raptor X's, which I set up in RAID 0 (striping) array.
Since I use the array for video material capture, drive/array reliability is less of a question, thus I bought 3x used drives (the first one I've bought new) on cheap and gradually built the array with top speed of 320 MB/sec read/write speeds. This speed is blazing fast and allows me to capture high quality video without single dropped frame.
Doesn't have to be Raptor X's, any Raptor will work well, due to high speed and very good reliability. Velociraptors are slightly faster, but are too expensive for RAID. Read full review.
this is an excellent hard drive I wish it was bigger but I like it
The 10000 rpm is awsome really fast im glad that I bought this one im using it for my operating system with everything else on another hard drive.
Man is this thing fast like start windows 7 from o ff to desktop in about 15 seconds before it was about 35 seconds fast. Read full review.
Western Digital Raptor X 150GB SATA Hard Drive = "B+"
First and foremost, this drive is FAST. 10,000rpms. This is exactly why I bought it. Seriuously, I installed Vista x64 in less than 15 minutes. The viewable lens on it gives it the edge t hat will make you feel better about shelling out a few extra bucks for it. With a couple more hooked up in a RAID config, you will have the fastest rig possible. The drive is relatively quiet.
The specs on the drive says it is 150GB, but only 139GB is available to use. That is a serious FAIL to me. They should market it as a 140GB drive. Also, the jumper settings are virtually non existent on the physical drive, I had to run a search for the user's manual to figure them out.
Good drive for the money if you are looking for performance. As far as capacity goes, it doesn't have much to offer. With the 10,000rpm drives you seem to pay about $1/GB of space, which is a bit pricey compared to 1Terrabyte drives which sell for about $120 @ 7,200rpm. Built for performance junkies. B+! Read full review.
This drive is great! Very fast! This drive decreased the time it takes to load applications by around 15%. Applications tend to "pop right up". A solid state drive would be faster than this, however t his was so much cheaper. My OS Drive fully loaded is large. I could go a lot smaller, but now I do not need to. If you don't have a whole lot of money to sink into storage, I would suggest getting one or two of these for your OS/game drive.
The drive is loud, I could hear it over everything in my old case (Antec 900) but since I've upgraded to the Cosmos 1000 by Cooler Master, I have to really listen for it to be able to hear it. Read full review.
The only one with a window!
Circa 2010, platter hard drives have been completely eclipsed in performance by Solid State Drives. Prior to the revolution, however, the Veliciraptor was always the fastest hard drive around. Now, the Raptor X isn't one of the latest versions (and therefore isn't quite as quick) but that's not why you buy one. This drive remains to this day the only drive with a plexiglass window that allows you to see the platter spin and the arm swing as it works. Yeah, it's noisy and gets a little warm. But you can watch it working! Nuff said! Read full review.
WD Raptor X 150GB SATA Hard Drive
I have to say the differance between my old WD 150GB 7,200rpm Hard Drive and this Raptor X 10,000rps Hard Drive are night and day! I can load apps and games in half the time I use to be able too. The only draw back of the Raptor X is it's louder than my old 7,200rpm Hard Drive, but for the diffenance in speed I would gladly buy it again! As a matter a fact I'm looking for another on to use with this one for Raid 0. A+ Western Digital you've made a great Hard Drive! I would recommend this HArd Drive to anyone. Read full review.
These are known to be high performance drives. Nobody else even makes a 10k rpm drive for a desktop system.
$90 would be nice, you could go buy a 74gb version for around $90 and that would do fine for a boot drive.
It looks like WD is pushing the Velociraptor though, I tried to pull this drive up on newegg to see what their price was and they no longer have it listed.
As far as the see-through side. it doesn't add any price in comparison to the regular 150gb model, it just looks cool and is marketed toward hardware enthusiasts and not so much toward your avg joe computer user who just checks their email and surfs the internet. Read full review.
Why is this review inappropriate
Compare any two graphics cards:What do the numbers all mean?
Memory Bandwidth. Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transported past the external memory interface within a second. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate. Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF).
Pixel Rate. Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the higher the memory bandwidth is, the more likely the card is to actually get to its maximum fill rate.
Texel Fill Rate
Pixel Fill Rate
Do someone can show me a good internet site where it is possibe to get a detailed and comprehensive CHECK LIST to be follwed during the DESIGN & CONSTRUCTION of a Pressure Vessel?
We get an order for a Pressure VEssel for China Market, but we do not know the GB-150 and we do not know if the simple use of ASME VIII1- or VII-2 is enough to get the approval from the China Authorities.
Exampe: if the requirements stated in the following Par. of ASME VIII-1 are accepted withount any problems or if there are other additional constraints to be followed:
Materials that can be used to Manufacture a Pressure
Vessel (Ex. UCS-5 to UCS-12,UNF-5 to UNF-15 and
UHA-11 to UHA-13) + any constraints on teh Raw Material
UG-23 + UCS-23 + UNF-23 + UHA-23
(Which Allowable Stresses to use to Design a Vessel)
UW-11 to UW-20 + UCS-19 + UNF-19 + UHA-21
(Regarding the Joint Efficencies to be used in conjunction
with the Inspection Level Phylosophy [ Ex. RT-1 to RT4 or
NO RX Check ]and which Weld Joint Details are allowed
or not allowed)
(Minimum Thickness of Pressure Retaining Components)
UG-11 + UG-44 + UW-21 for Standard Flanges
(Use of the Standard Rating without performing
any other additional Code Calc.)
UG-84 + UCS-66/67/68 + UNF-56 + UHA51
(For Impact Tests Requirements)
UW-10 + UW-40 + UCS-56 + UNF-56 + UHA-32
(For PWHT Requirements)
UG-99 or UG-100
(Final Equipment Testing)
Any other ASME Par. tied to the FABRICATION and INSPECTION
activities to be performed on teh Vessel during the DESIGN
Many thanks in advance.
gr2vessels (Mechanical) 17 Apr 08 18:54
Is the order you got written or verbal? It is a bad business practice to fabricate a pressure vessel for someone who is unable to specify the code you have to use. Don't try to guess your way out, Murphy says that you'll fail the whole project.
You must ask the Client for a clear specification of what you are expected to fabricate and supply. If your scope is to design to the Chinese code, buy the code and read it carefuly. The Chinese approval for imports is not your problem, is your Client's duty to obtain their legal approvals for the vessel, including the compliance with their code. Otherwise the Client should clearly specify what is he expecting you to provide.
I know, you are trying to give a cheap product to someone asking for the cheapest product, but in this business where safety is involved, if anything goes wrong, they will dig you up from your deepest hole to get you.
We are on finalization of the Purchase Order.
The problem is that our Client (Not Chinese) want the ASME Code but at the same time compliance with Chinese Regulamentation (The Client has no long time experience and has no a clear pictures of what he has to do an want we have to do).
We do not know GB-150 Code. We have take a look inside but. finding the differences respect to the ASME Codes (even if it is similar) is a high time consuming activity!
Essentially the problem is an problem of interpretation of the GB-150 requirements? There is no INTERPRETATION VOLUME as that of the ASME CODE Collection where it is possible to take a look inside and to try to find a clarification on GB Requirement.
Discussing with other peoples, sometime seem that a design FULLY COMPLIANCE with ASME VIII-1 or VIII-2 is accepted "AS IT IS" without any changes or additional requirements coming out from the Chinese Authorities (CSEI/SELO).
Some times seem that there are additional constraints on Type of NDE and on their Extension (Ex: "No RX check" seem that is not acceptable for Chian Authorities even if allowed by ASME Code), sometime on the value of Allowable Stresses (Ex. Safety Factor on Carbon Steel Material is 1.6 in lieu of 1.5 sated by ASME applied to Sy @ Design Temperature) and Joint Efficencies (if RT3 or RT4 Level, E are different from that of ASME).
Further more, it is not clear which are the LATEST ISSUES and any recent or superseeded AMENDMENTS.
The sumamry is: confusion + last sentence is at charge of CSEI/SELO at the end of the Project.
This is the reason why I'm looking for a GUIDE: to start inteh good way and to avoid discussion at the end of teh project.
gr2vessels (Mechanical) 18 Apr 08 07:11
Sorry Ganfoss2, but I don't know well enough the Chinese code, to give you specific advice on the differences between ASME and the GB-150 codes.
I think however, that it will be very hard if possible at all to find someone in this forum, versatile in both Chinese and American code, more likely you'll find someone in China, expert in GB 150 and good enough in ASME code to explain you those differences.
I suggest to complete the design in accordance with ASME code, print out the calculations, then take the GB-150 and run the calculations again in "chinese", the differences will pop-up instantly. You should then be able to evaluate the differences and adjust the "ASME" design accordingly. As far as fabrication, NDE and inspection concerns, if you inspect in accordance with ASME code, I'm sure you will do more than the typical gate guard does in China.
etsen (Mechanical) 18 Apr 08 07:36
Maybe you will have some ideas from the post titled 'Special Equipment Manufacturing Licence for China'
(http://www .eng-tips. com/viewth read.cfm?q id=214570& amp;page=1 ).
Design and fabrication of pressure vessel according to ASME construction code are accepted in China. And the manufacturer must also follow the regulations:
1.Supervision Administration Regulation for Manufacture
of Boiler and Pressure Vessel
2.Requirements for Boiler and Pressure Vessel Manufacture Licensing
3.Procedures for Manufacture licensing of Boiler and Pressure Vessel
4.Supervisory Inspection Rule for Safety Performance of Boiler and Pressure Vessel Products
5.Revised Regulation for Boiler and Pressure Vessel Manufacture Licensing
You can get them from the link 'http://www.cnisn.com.cn/IRC/EIRC/special1_1.html '. Thank eeromatti for providing this link.
Many thanks to all.
I have found a lot of constraints regarding NDE Inspections during Manufacturing. Constraints on RX Check level, definition of the Allowable Stress and on Joint Efficencies.
The best way is to proceed is to directly submit the Proget directly to the China Authorities for any of their comments.RE: Export into China: GB-150 Code & ASME
cmsvessel (Mechanical) 19 Apr 08 15:59
For your questions, you have the follwoing options:
1. You get your company registered with China vessel regualtion authority. They will issue your company a cert of authorization. But this takes time and you must have somebody within your comapny who knows Chinese Code-GB150 and other related code;
2. It is possible that your Chinese customer can accept AMSE designed and fabricated vessel;
3. I have an engineering company in China, and if you want, I can have my people design your vessel in accordance with Chinese code; or
4. you can even contract us for these vessels which can be made per Chinese code.
I see no possibility that you can satisfy both ASME and GB-150.
GenB (Mechanical) 28 Apr 08 12:59
It is best to contact your A.I. agency who can help you
get the certifications TUV and others inspect in China so they are best advisors.
if the customer wants just ASME, send them ASME cert vessels
be sure you get your money in advance so if the gov. gets them it is their problem.
Just as they ship all their stuff here w/o any certifications and the importer has to eat any problems.
I am quoting some vessels to china right now, any other than ASME is their problem.-
TomBarsh (Structural) 30 Apr 08 09:27
For what it's worth, a Google search turned up this comparison between ASME and GB 150 Code (Chinese Code):
"Comparison of GB and ASME Standards" presented by an ASME subgroup in Singapore
It looks pretty informative.RE: Export into China: GB-150 Code & ASME
Many thanks to all! Now the picture star to be clear.
We have shifted the problem of the DESIGN APPRAISAL to our Client. We are a Registered Manufacturer for the China Authorities so Ok with the export.
I have made the entire design calculations in full accordance with ASME. I was obliged to "optimize" reducing the thk of the main components as much as possible (P.Des very very close to MAWP) for. "cost saving" otherwise. no chance!
But now. seem that I have to take in account the allowable stress modified by SELO/CSEI that are different from that stated inside ASME plus all the requirements stated inside the "Regulation for Boiler and Pressure Vessel Manufacture Licensing" Document + its successive revision (Constraints on: Equip. Design + Raw Material Certification + Equip. Construction Inspection).
I have to redo the Equipment Design another time (I hope for the last time!)
It seem so strange for me: I heard form other of my collegues working in other Companies that they have exported into CHINA in full accordance with ASME without any amendment to the Code.RE: Export into China: GB-150 Code & ASME Here there is an extraction from the GB Code. This also reflect the requirements stated inside "Regulation for Boiler and Pressure Vessel Manufacture Licensing" of SELO/CESI (if you do not know GB-150,the scripture stated inside the Document of SELO/CESI is. acriptical!)
cmsvessel (Mechanical) 30 Apr 08 18:55
"It seem so strange for me: I heard form other of my collegues working in other Companies that they have exported into CHINA in full accordance with ASME without any amendment to the Code. "
Not strange at all. I told you in my reply. It is possible for your China customer to accept ASME stamped vessel.
Now that you are exporting to China, why do not you out source the fabrication to China.RE: Export into China: GB-150 Code & ASME
My company is planning to outsourcing in India (concrete scenario). The "China Option" is a. "commercial experiment" (we arrived in that market later!)
My local market (in my country) do not offer too much opportunities (too many and to feew jobs): It is not more the "gold age" like 10 or 20 years ago (I was too young at that time!).
In any cases. I prefer that everthing will be manufactured and designed in my country, otherwise. It shall be difficult for me (and my collegues) to reach the age at which I can retire from work (I have to wait for at least other 20 year!) But. the "commercial war" with our Worldwide Competitors (expecially that from the far east) is not so "easy to win"!
At the end shall be: "if you can't win against your enemy then maybe try making an alliance with him". That is your suggestion at the end.
Other solutions? Difficult to find! Invent something of "new" that nobody do not do? Now it is not so easy to make something of "new" expecially in the Steel Pressure Vessel Manufacturing "Systemm". Even new theard of "use new/innovative materials". it is a bet for the future that should be win by a FINAL USER before and by any Potential Engineering Companies later.
For "new" the problem is to have the "courage" to propose a new solution.
NOTE: Courage, also known as bravery, will and fortitude, is the ability to confront fear, pain, risk/danger, uncertainty, or intimidation. In the "Pressure Vessel Manufacturing Market" it is the OPPOSITE (from FINAL USERS & ENGINEERING COMPANIES).
But I'm shifting out of the main argument of this thread. Sorry.
Again, many thanks to alls for your replies.RE: Export into China: GB-150 Code & ASME
vida23 (Mechanical) 10 Jun 08 21:30
That's a wanderful argument! I am a designer in MORIMATSU GROUP (CHINA). We often do the CASE USING BOTH ASME AND GB150-1998 for the clients all over the world. www.morimatsu.com.cn
I think the main differences between ASME VIII-1 & GB150 are the following:
allowance stress(safy factor ASME is 3.5, GB is 3.0)
NDE(RT >=20% PER WELD LINE, IN ASME THAT'S SPOT RT, ONE SPOT shall be examined on each vessel for each 50ft.)
Joint Efficencies for some materials(FULL EXAMINATION) is not allways 1.0(for example,AL, CU, Ni, Ti, Zr)
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The ASME Y14.5-2009 standard on dimensioning and tolerancing was published in April 2009 and is a revision of the ASME Y14.5M-1994 standard. According to the American Society of Mechanical Engineers (ASME), "a consensus committee of experts revised Y14.5 for 21st-century applications."
The revised standard includes changes to:
As the foremost expert on GD&T, ETI founder Alex Krulikowski was involved in creating this new version of ASME Y14.5. He has developed several products to help with the transition from the 1994 to 2009 standard:
ASME Y14.5-2009 Products and Workshops
Full-color textbook containing more than 400 pages with several new features that aid in the understanding of GD&T; focuses on critical thinking skills that help the reader when applying newly learned GD&T concepts on the job
More than 1000 full-color projectable slides, a printable 3-day course agenda, handouts, and answers to the textbook exercises—all accessible with the click of a mouse.
Complete training in GD&T fundamentals
The Ultimate GD&T Pocket Guide
Spiral-bound pocket guide, 120-pages, contains charts, detailed drawings, full definitions of major concepts, and more
A set of 2 illustrated, 2-sided, 11"x17" charts
A comprehensive 8-hour workshop
ASME Y14.5 Standard Comparison:
1994 - 2009 Web-Based Course
Web-based version of the workshop, available in 30-, 60-, or 90-day access
Fundamentals of Geometric Dimensioning and Tolerancing, Using Critical Thinking Skills by Alex Krulikowski
The Fundamentals of Geometric Dimensioning and TolerancingUsing Critical Thinking Skills textbook has been completely updated to reflect the changes in the ASME Y14.5-2009 Standard. This third edition preserves the best features of the first two editions while adding new material that reflects the changes in the field of geometric tolerancing.
Our new full-color textbook contains more than 400 pages with several new features that aid in the the understanding of geometric tolerancing. It also focuses on critical thinking skills that help the reader when applying newly learned GD&T concepts on the job. It's the most practical and easy-to-use GD&T textbook on the market.
Each of the textbook's 27 chapter focuses on a major topics that must be mastered to be fluent in the fundamentals of geometric tolerancing. Each goal is defined and supported by a set of performance objectives. There are more than 260 performance objectives that describe specific, observable, measurable actions that the student must accomplish to demonstrate mastery of each goal and are a key to success for both the student and the instructor.
Material that builds and develops critical thinking skills is contained within each topic, with questions that utilize those skills at the end of each chapter.
Fundamentals of Geometric Dimensioning and Tolerancing, Using Critical Thinking Skills Digital Instructor's Kit by Alex Krulikowski
The Fundamentals of GD&T Instructor's Kit is a start-to-finish, performance-based training package that saves hours of course preparation time. The course was developed by GD&T expert Alex Krulikowski and is cross-referenced with his textbook, The Fundamentals of Geometric Dimensioning & Tolerancing, Using Critical Thinking Skills . The program is designed for use with a computer and a multi-media projector and allows keyboard or mouse navigation.
Based on ASME Y14.5-2009, the course covers the terms, symbols, rules, and concepts of GD&T. It includes an indepth explanation of geometric symbols, including each symbols requirements, tolerance zones, and limitations. It's the most thorough and comprehensive training on the market.
The Fundamentals of GD&T Digital Instructor’s Kit contains more than 1000 full-color digital slides that aid in teaching geometric dimensioning and tolerancing.
Fundamentals of Geometric Dimensioning and Tolerancing, Using Critical Thinking Skills Workshop
If you have a basic understanding of mechanical drawings, we can teach you the terms, rules, symbols, and concepts of GD&T as prescribed in the ASME Y14.5-2009 Standard.
The course focuses on a major topics that must be mastered to be fluent in the fundamentals of geometric tolerancing. You'll receive an in-depth explanation of geometric symbols, including each symbols requirements, tolerance zones, and limitations. The class includes a comparison of GD&T to coordinate tolerancing; an explanation of tolerance zones; Rules #1 and #2; form and orientation controls; tolerance of position; runout and profile controls.
The course contains more than 260 performance objectives that describe specific, observable, measurable actions that the student must accomplish to demonstrate mastery of each goal. Material that builds and develops critical thinking skills is contained within each topic, with questions that utilize those skills at the end of each chapter.
The Ultimate GD&T Pocket Guide is the perfect on-the-job pocket reference for your geometric dimensioning and tolerancing needs. The new ASME Y14.5-2009 pocket guide includes all the topics from the 1994 version with updates to the 2009 ASME Standard and 50% more content. Click on the graphic for a larger view.
Spiral-bound, more content, includes index tabs for on-the-job functionality
The 2009 GD&T pocket guide is now spiral bound so it lays flat. It also has se veral new organizational features, like index tabs, a topical index, and a glossary. We've added references to clauses within the standard and cross-references to other pages within the pocket guide that contain application examples or other related information.
The Ultimate GD&T Pocket Guide is a handy reference tool in one convenient pocket-sized package. Carry it with you on the job and have a resource to all your GD&T questions at your fingertips.
This product is a valuable tool for: designers; product, manufacturing, and quality engineers; CMM operators; checkers; quality personnel; engineers; students; and anyone else who uses GD&T on the job. See sample pages. Order the pocket guide .
ASME Y14.5M-1994 to ASME Y14.5-2009 New Features Comparison Chart Set
Compare the features of ASME Y14.5M-1994 and ASME Y14.5-2009 quickly and easily with the New Features Comparison Chart Set. This set of two, 2-sided charts illustrates the itemized changes in the standard for quick, on-the-job drawing interpretation. An ideal tool for the working designer, engineer or design manager, this pair of fully illustrated, 11" x 17" charts fits in a 3-ring binder.
Order enough for your entire department. Contact ETI for quantity and educational discounts. Order the chart set.
ASME Y14.5 1994 - 2009 One-Day GD&T Update
Understand the fundamental differences between ASME Y14.5M-1994 and ASME Y14.5-2009. The one-day ASME Y14.5-2009 Update Workshop will teach you about the pertinent changes made to the Y14.5 standard. You learn how the subject matter has been reorganized, and about new sections that have been created for profile, orientation, and form.
The workshop covers these major changes to the standard:
ASME Y14.5 Standard Comparison: 1994 - 2009 Web-Based Course
The new ASME standard contains numerous changes that affect the specification and interpretation of geometric tolerancing. This course covers over sixty significant revisions, additions, and deletions to the new standard. You'll learn how t he subject matter has been reorganized, and about new sections that have been created for profile, orientation, and form.
This course contains an introduction section and nine lessons with quizzes. It takes approximately 8 hours to complete. The course can be purchased for 30-, 60-, or 90-day access.
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PN is the rating designator followed by a designation number indicating the approximate pressure rating in bars .
PN ratings do not provide a proportional relationship between different PN numbers, whereas class numbers do.Australian Standard
AS2129 originates from BS10 and has been metricated. In some cases slightly larger bolt holes provide better clearance as metric bolts are specified in lieu of UNC bolts used by BS10. AS4087 is an update of AS2129, however AS2129 is still widely used so it has not been deleted as a standard, however, it now only covers AS table D to H.
AS4087 is the latest standard for BS table D to H, the same drilling is used but the new PN pressure rating system has been adopted. As the new pressure ratings are slightly higher the flange thicknesses have slightly increased. Also the raised face dimensions (although rarely specified, flat face is mostly used) are slightly larger. Table C, J to R, no longer exist, PN16 is the same drilling as Table D, PN21 is the same as Table E, PN35 is the same as Table H. AS4331 covers PN2.5 to PN420 and the sizing and drilling used is a replication of ISO 7500-1 which in turn is a metricated equivalent of ASME B16.5 class 150 to 2500.API6A
API6A flanging is used in Australia in oil drilling and wellhead systems. (see our oilfield slide rule click here. API ratings range from 2,000 to 20,000 psi (cold working pressure). ANSI was originally born from API, consequently in class 600 to 900 and 1500 ANSI the flanges are dimensionally equivalent to API 2,000, 3,000 and 5,000 in most sizes to ANSI 300NB (12”) API 13 5/8” but ANSI flanges being manufactured from lower yield strength carbon steel are rated to lower working pressure. However GSL stocks high yield carbon steel API6A 45K weld neck flanges which are compatible with ASME A234 WPB fittings and A106B/API5LB pipe. Click here to find out more.ANSI/ASME
ASME (American Society of Mechanical Engineers, of which Australian Pipeline Valve is a member company) is a group of standards, which are in turn covered within the American Standards Institute (ANSI), hence their flanges can be referred to as ANSI or ASME class. Class is also traditionally abbreviated CL or LB (verbally spoken as pound) or cross hash (#) but not psi as this can be misconstrued as the cold working pressure (CWP). Since ANSI 150 for instance has a CWP of 285 psi, so unlike the PN system the class is not related to CWP. AS4331 has adaptor ANSI drilling and sizes but uses PN rating classes! Consequently in some sizes flanges are thicker to bring the rating up to the required PN rating.ASME Pressure Classes of Flanges
Forged steel flanges, ASME B16.5, are made in seven primary ratings:150Lbs – 300Lbs – 400Lbs – 600Lbs – 900Lbs – 1500Lbs – 2500Lbs
A Class 300 flange is rated to a higher pressure than a Class 150 flange, because a Class 300 flange is constructed with more metal and therefore can withstand more pressure. However there are a number of factors that can impact the pressure capability of a flange.
The Pressure Class for flanges is often expressed in ‘pounds’. Different names are used to indicate a Pressure Class. For example: 150 Lb or 150 Lbs or 150# or Class 150, all mean the same.ASME Pressure Rating
Flanges can withstand different pressures at different temperatures. (Refer to pressure/temperature charts at this website for various material types). As temperature increases, the pressure rating of the flange decreases. For example a Class 150 A105 flange is rated to approximately 270 PSIG (1861 KPA) at ambient temperature, 180 PSIG (1241 KPA) at approximately 400ºF (204ºC) 150 PSIG (1034 KPA) at approximately 600ºF (315ºC), and 75 PSIG (517 KPA) at approximately 800ºF (426ºC). Consequently when the pressure goes down, the temperature goes up and vice versa. Additional factors are that flanges can be constructed from different materials, such as stainless steel, cast and ductile iron, alloy steel, carbon steel, etc. Each material has a different pressure rating.
Below is an example of a flange NPS 12 (300NB) in all main pressure classes. This example demonstrates that diameter of the raised face are all the same; but outside diameter, bolt circle and diameter of bolt holes become larger in each higher pressure class. The bore is subject to the required schedule. Refer to our Flange Chart – ‘Online Slide Rule’ above for flange dimensions. The number and diameter (mm) of the bolt holes for the example below of 300NB is: 12 x 25.4mm Class 150, 16 x 32mm Class 300, 16 x 34.9 Class 400, 20 x 34.9mm Class 600, 20 x 38.1mm Class 900, 16 x 54mm Class 1500 and 12 x 73mm Class 2500.
Pressure/temperature ratings are maximum allowable working pressures allowed as per ASME B16.5 (published in metric and imperial). For intermediate temperatures, linear interpolation is calculated by manufacturers.
Pressure-temperature ratings apply to flanged joints which may be reduced by gaskets or studs used.
The temperature shown for a corresponding pressure rating is the temperature of the pressure-containing shell of the valve or flange. In general, this temperature is the same as that of the media in line and the external environment, whichever is greatest (but also lowest temperature of each must be factored for low temperature service). For any temperature below -29ºC, the rating shall be no greater than the rating shown for -29ºC, depending on materials the rating can be lower.
The below two tables are examples of two material groups according to ASTM, flange pressure-temperature ratings to ASME B16.5 – 2009.
ASTM Group 2-1.1 Materials