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Comments, Questions & Answers
Click on any Question for the full text.

Question # 5001:   What are the goods and bads of being a mechanical engineer?
Response 1:
The good points and the bad points of anything are based purely on .....

Question # 5002: How can a Mechanical Engineer (Estimation Department) reflect his .....
Response 1:
Estimators for Mechanical Contractors in the Petroleum Refinery and .....

Response 2: You are a very lucky young man. Starting off in the estimating department ...

Question # 5003: When is the piping community going to let those that have PDMS .....
Response 1: There are a number of opportunities for new graduates of PDMS .....
Response 2: The piping community does not disallow people with a PDMS course....
Response 3: hi,piping people it is my first contribution here.I'm a piping designer for ...

Question #5004:I am taking a physics course in highschool. For a project I am doing I need a mechanical engineer to answer a few questions...
Response 1: Following are the above repeated questions and their corresponding response in capitals:

Question #5005: Back a few years ago there was a rash of counterfit ANSI flanges ....
Response 1: The issue I believe you are referring to was reported in the October 12...
Response 2: Protect yourself or your company by requiring the chemical reports...
Response 3:
Over the past two years I have found three 6” 150# weld neck flanges...
Response 4: Hi, I am a Sales Engineer working in a company distributing pipes, flanges ...

Question #5006: We are having a problem with copper tubing failure ...
Response 1: Has the system been properly isolated from any possible electrolysis ...
Response 2: Have you checked the chemical composition of the water supply ? Even ...

Question #5007: Lisa writes -I am looking for a few good books on pipe fabrication...
Response 1:
Visit the Piping News Bookshelf Page. There are seven categories...
Response 2: Contact me (michael.c.warren@xcelenergy.com) and I can point you ...

Question #5008: How does a steam trap function?
Response 1: Go to http://www.pipingnews.com/memberpipingne/steam_traps.htm, ...
Response 2: Check out http://www.steamlink.com It has plenty of sites to visit to ...
Response 3:
Steam traps fall into 3 major categories:

Question #5009: Why do we provide 3mm steel rod on sleepers/piping resting supports?
Response 1: Could you provide a description of how the 3mm rod is used in ...
Response 2: The main reasons for providing the 3mm dia. rod for pipe supports ...
Response 3: Rod between pipe shoe and sleeper results in point/line ...
Response 4: People are getting way too deep into this friction thing. Since the ...
Response 5: I work in a Refinery near the Gulf and laying any piping directly on ...

Question #5010: I have seen the letters "NBS" stated in a particular specification ...
Response 1: What "Codes & Standards" are you referring to? And what is the ...
Response 2: Anand Chordia-India: Are u sure that u have seen this under "codes ...

Question #5011: What has happened to all of the petrochem/refinery piping jobs?
Response 1: They are not in Baton Rouge. It is slow here. FB&D and Jacobs are ...
Response 2: I don't know. It's been slow here in Western Australia as well. There ...
Response 3: Slow in Michigan.
Response 4: Slowest that I have seen it here in Houston since 1982-1986.
Response 5: Also the slowest I've seen in years.Heard there is lots of piping design ...
Response 6: Been slow here in Alberta Canada to, but with freeze up just around ...
Response 7: Anand,India- I can not say that it is totally lean or dry but not very ...
Response 8: Yall have said it all ! I just came from a semiconductor job in China ...
Response 9: I hear that there some of the large A&E power Engineering Co. are ...
Response 10: you only need 1 job fellows... DAVIN
Response 11: Slow to dead in Jersey & surrounding N.Y., Phila area. Some small ...
Response 12: Just got done doing a job for Tech-nip USA in Cordova, IL. Friends ...
Response 13: I have been a piping designer for 30 years and have never seen the ...
Response 14: All of our jobs have been exported to Eastern Europe, The Philippines and India.
Response 15: In talking to the heads of different departments, about sending jobs...

Question #5012: Does anyone have pressure temperature ratings for backing ...
Response 1: If the backing flanges, aka: lap joint flanges, lapped flanges and van ...
Response 2: There is NOT any pressure/temp. chart for Van-Stone (lap joint) type ...

Question #5013: For a university in the Netherlands, I have to carry out a technical ...
Response 1:

Question #5014: Does anyone know of any industry standards for coke oven gas ...
Response 1:

Question #5015: In a refinery plant ,which is preferrable location for air coolers : top ...
Response 1:
Depending on the overall layout and design scheme, and not being sure ...
Response 2: From Anand-India: It can be either on Pipe rack or technical structure. Generally ...

Question #5016: Which location is widely used to locate pumps in a A) Refinery, B) ...
Response 1:The first step in creating a layout for your facility is to develop a routing ...

Question #5017: What are the design parameters for location of flare towers in a ...
Response 1:

Question #5018: Does anyone have any information (Excel Spreadsheet mounted) ...
Response 1: Cherne Mechanical of Minnesota has a unbelievable detailed spreadsheet ...
Response 2:
estimation requires experience and every good estimator will have stored ...

Question #5019: I have a  question in regards to commissioning a fairly long underground ...
Response 1: You are asking an engineering question expecting cookie cutter answer ...
Response 2:
Call a company like Spirax Sarco. They would analize your system and ...

Question #5020: What is the difference between true north and plant north?
Response 1:A plant North is used much like a fictitious elevation ... for convenience. If a plant...
Response 2:
This note is prepared to explain the significance of GN (Geographical North) and ...

Question #5021: What is "Seal Pan" in Vertical Towers? What is the importance of the same?
Response 1: A seal pan is designed to provide a liquid seal at the bottom of a downcommer, preventing ...

Question #5022: From MLK, Baroda-India: What is the economical option as regards to fabrication ...
Response 1: You ask a hard question in a short sentence.  HDPE is of course very expensive ...

Question #5023: Amit Biniwale-Baroda,India:What is the meaning of term steam out ?
Response 1:The term "steam-out" refers to the process of using steam to clean out a piping system ...

Question #5024: From Vipul Desai, Baroda- India. "Can anybody recommend me any piping ...
Response 1: Sorry! Vipul, IIT course is not bull.... It is a very structured course. Prof. Moharir is doing ...
Response 2: In  India following institutes are conducting piping courses. you can visit their websites

Question #5025: What is water hammer?
Please click here to offer your response. Reference Question #5025
Response 1: Water hammer, also known as hydraulic transients, are actually surge waves that occur ...

Question #5026: Can anyone tell me where to find weights for mortar lined pipework?
Please click here to offer your response. Reference Question #5026
Response 1: Try contacting the Ductile Iron Pipe Reasearch Association (DIPRA) at http://www.dipra.org

Question #5027: Does anyone know where I can find one of those steam slide calculators that help you ...
Please click here to offer your response. Reference Question #5027
Response 1: Calculator, yea, I know where you can get that calculator. Go to Wal-Mart and pick up a TI scientific, then ...

Question #5028: Where is a good place to look for piping design training?  I have been in the chemical field...
Please click here to offer your response. Reference Question #5028
Response 1:   I don't know but when you find out let me know.
Response 2: Ask your company to send you to the ASME B31.3 or B31.1 course. Buy  or go the a large ...

Question #5029: Good morning fellow engineers, I am looking for how is the ASME 31.3 Code applied for NON-METALLIC piping...
Response 1: Depending on the scope of the project, either ASME B31.1, B31.3 or B31.9 would be the governing piping ...

Question #5030: What does "spot faced" mean when referring to the facing of a flange?
Please click here to offer your response. Reference Question #5030
Response 1: Spot-facing, or back-facing, in regard to pipe flanges, is a machined area on a rough surface to provide ...

Question #5031:  I have a situation where we are bolting new flow meters with a raised face flange to a flat
Please click here to offer your response. Reference Question #5031
Response 1: It basically depends on the governing Code for your project, or system. If B31.3 is the governing Code ...
Response 1: How about using a Straub coupling to make your connection? Let me know if you ...

Question #5032: Where can I get design tables for pipe riser clamps? I am looking for some design data for pipe ...
Please click here to offer your response. Reference Question #5032
Response 1: Check out http://www.fastenersandtools.com/shop/hang5.html

Question #5033: We are looking for a Japanese suppliers for Carbon Steel pipes & Fittings for Sour Natural Gas ...
Please click here to offer your response. Reference Question #5033
Response 1: I am in Japan.  If you can tell me a little more about what you need.  I can try to locate you a supplier...

Question #5034:  I have to do an "assessment" of a 30+ year old steam and condensate distribution system for a ...
Please click here to offer your response. Reference Question #5034
Response 1: There are actually three main components that should be checked when auditing a steam distribution, ...
Response 2: I really get kick out of many junior engineers asking the important design type questions. You see ...
Response 3: For the sender of response 2. The only thing worse than an arrogant engineer is an arrogant engineer ...
Response 4: Be sure you take stoppered samples of the condensate with the view to testing for oxygen.  Space ...
Response 5: There is some Steam surveys that will help you get the ball rolling so you do not ...

Question #5035: In the case of ESD in sour gas compressor Stations with inlet pressure more than 120 bar , should ...
Please click here to offer your response. Reference Question #5035
Response 1:

Question #5036: I face a problem of removing  black HAZ after welding SS sheets. I have an equipment having 30 V AC ...
Please click here to offer your response. Reference Question #5036
Response 1: If the discoloration you have is with austenitic stainless steel it can be removed by pickeling with a solution ...

Question #5037: What makes the ASTM A105 as the universally adopted material for forgings?
Please click here to offer your response. Reference Question #5037
Response 1: Having been founded in 1898, ASTM currently has over 30,000 members in more than 100 countries. It has...

Question #5038: Does ASTM A105 comes in two grades, Gr I and Gr II? If yes then does A105 implies A105Gr I? Which metallurgical ...
Please click here to offer your response. Reference Question #5038
Response 1: ASTM A105 does not come in various Grades or Classes. When specifying ASTM A105 forged ...

Question #5039: Is there any thumb rule for guessing the Class rating(150lb, 300lb etc) of a piping component only by knowing the ...
Please click here to offer your response. Reference Question #5039
Response 1: There is no rule of thumb for determining a flange Class under ASME B16.5. ASME B16.5 ...

Question #5040: At what intervals shall we put steam trap assembly on the LP, MP or HP Steam lines? What are the engineering ...
Please click here to offer your response. Reference Question #5040
Response 1: Intervals, no such thing as intervals in steam piping systems, (were not running water piping Buddy)...
Response 2: I am Union Pipfitter with a great deal of experience in steam. As I think knowledge ...

Question #5041: Does anyone know of any technical papers or magazine articles written about the problem of attachments  to piping ...
Please click here to offer your response. Reference Question #5041
Response 1: See if you can find an “OLD” ITT Grinnell hard cover book. If I remember right ...

Question #5042: I am hoping someone out there can help me. I would like info, literature on API 1104 Overland Piping. Any HELP would ...
Please click here to offer your response. Reference Question #5042
Response 1: API Standard 1104 - Welding of Pipelines and Related Facilities covers gas and arc welding for the ...
Response 2: Thank you for your response. Having studied API 1104 8th Ed 1994, I would like to be able to go several...
Response 3: I guess the way forward is to look at he specific Design Code that your Overland Pipeline is...

Question #5043: What design criteria should be used in sizing a knockout drum for prevention of liquid carryover to a process flare?  What ...
Please click here to offer your response. Reference Question #5043
Response 1:

Question #5044: Is there anybody out there that can help me?? I am british and living in the Netherlands, in the Rotterdam area, and have a ...
Please click here to offer your response. Reference Question #5044
Response 1: All of us "oldtimers" learned from Process Piping Design by Rip Weaver. You can find this book on ...

Question #5045: What is the best way to make a super-heated steam chamber in a lab to be used by a college student?
Please click here to offer your response. Reference Question #5045
Response 1: The best resource for the information you need is the companies that actually utilize these lab systems on ...

Question #5046: Hello:
Can anyone tell me if the pipe from a once through boiler to a steam driven turbine with a temp of approx 1000 degrees F ...
Please click here to offer your response. Reference Question #5046
Response 1: You need to both slope the line in the direction of flow and install the proper steam traps in strategic ...

Question #5047: I need to determine the minimum input track dimensions (up to the point of the surge protection) for a board layout that ...
Please click here to offer your response. Reference Question #5047
Response 1:

Question #5048: Dear Sirs, I am a student and am currently doing two different projects for university and need some information ...
Please click here to offer your response. Reference Question #5048
Response 1: I can send you information on specifications, materials, piping design, and brewery process. I am not ...

Question #5049: Plant design Software : I would like to know the feedback on the Bentleys "PLANT SPACE" & CEA technologies ...
Please click here to offer your response. Reference Question #5049
Response 1: The "Bentley system" Intergraph MicroStation®, Power Draft Bentley, ®  are known for being a open ...

Question #5050: Could I know the cost for PWHT work of plant piping in US ?
Please click here to offer your response. Reference Question #5050
Response 1: Contact you local Heat Treating Vendor near you for estimates. They will probably be happy to give you ...

Question 5051: How do you calculate the quantity of steam flow through a slot in the steam pipe?
Please click here to offer your response. Reference Question #5051
Response 1:

Question 5052: I am an Engineering graduate from Nigeria. I want to know if there is any software I can ...
Please click here to offer your response. Reference Question #5052
Response 1:There are various Piping 3D softwares available like ..

Question 5053: Does anyone know where I can get a copy of "Design of Piping Systems" by...
Please click here to offer your response. Reference Question #5053
Response 1: Most of your larger University Libraries have the 1956 edition which is still as good as ...

Question 5054: I am trying to design a section of pipe which will be used instead of a restriction ...
Please click here to offer your response. Reference Question #5054
Response 1:

Question 5055: Dear friends: I have a water transfer pump with 7 liter/sec @ 4 bar head. According ...
Please click here to offer your response. Reference Question #5055
Response 1:

Question 5056: I need to calculate the anode wt for 8" piles supporting two platforms and a walkway ...
Please click here to offer your response. Reference Question #5056
Response 1:

Question 5057: I am trying to source the steam piping for the installation of 9 turbine generators in ...
Please click here to offer your response. Reference Question #5057
Response 1: I would suggest Benteller in Germany for Chrome Moly Tubing and Piping. Naturally...

Question 5058:  I want to take up PDMS Course. Can anyone provide me, the contacts, for doing this course, possibly in India.....
Please click here to offer your response. Reference Question #5058
Response 1: PDMS Course is available at MIT, Pune, India  of Approx 2 Months. You may visit...

Question 5059: Here is my question: I have pressure / flow taps in a pipe line 20” P22 [Approx. 4.5” wall, with Design Pressure...
Please click here to offer your response. Reference Question #5059
Response 1:

Question 5060: how to calculate the piping load in the rack?
Please click here to offer your response. Reference Question #5060
Response 1:

Question 5061: My fiance has recently accepted a PDS job here in SC. He has been to 2 short training courses
Please click here to offer your response. Reference Question #5061
Response 1:

Question 5062: What is flare knock out drum?

Please click here to offer your response. Reference Question #5062
Response 1
: The knock out drum is the final step before the gas reaches the flare stack in which ...

Question 5063: Which valve is better for on/off operation in process lines, whether gate valve or butterfly valve ...

Please click here to offer your response. Reference Question #5063
Response 1: Specifying the correct on/off valve is dependent upon the fluid service and the design ...

Question 5064: Is the diameter of butterfly valves governed by pipe schedule?

Please click here to offer your response. Reference Question #5064
Response 1: No.

Question 5064a: I heard that 3D distance should be maintained in upstream and downstream of swing check valve to avoid ...

Please click here to offer your response. Reference Question #5064a
Response 1: Valve chatter is not due to turbulent flow. It is indicative of an oversized valve, which ...

Question 5065: When a check valve is installed fitting to fitting down stream of gate valve will pressure drop ...

Please click here to offer your response. Reference Question #5065
Response 1: Valve chatter is not due to turbulent flow. It is indicative of an oversized valve, which ...

Question 5066: What’s the difference between variable spring support and constant spring support?

Please click here to offer your response. Reference Question #5066
Response 1:  A variable spring support is simply a pipe support that utilizes a spring to absorb movement ...

Question 5067: As per OISD118, aggregate capacity of tanks located in a dike wall enclosure shall not exceed ...

Please click here to offer your response. Reference Question #5067
Response 1:  Not aware of OISD118. For calculating the volume a secondary containment (dike) area is to ...

Question 5068: What is the difference between a drip leg and a steam trap?

Please click here to offer your response. Reference Question #5068
Response 1: A drip leg is a vertical section of pipe that provides a place for condensate to collect outside the ...

Question 5069: What is the difference between 2d and 3d expansion loops in piping? How do 3d loop works?

Please click here to offer your response. Reference Question #5069
Response 1:  We have never heard expansion loops referred to as 2d and 3d before, but what it most likely ...
Response 1: What would be the estimated Ratio difference between the 2d and 3d loop ?

Question 5070: What are the limitations of a fillet weld with respect to weld size. Can a 6mm fillet weld ...

Please click here to offer your response. Reference Question #5070
Response 1: For static loads the calculation for determining fillet weld size is .707 x minimum metal ...

Question 5071: Is it allowed to make fitting to fitting connection in process pipe line?

Please click here to offer your response. Reference Question #5071
Response 1: Yes.

Question 5072: Can a gate valve be mounted with hand wheel vertically facing down or horizontal in process lines?

Please click here to offer your response. Reference Question #5072
Response 1: It is recommended that a valve not be installed in an orientation that would place the handwheel ...

Question 5073: What is hammer blind valve? As far as my knowledge is concerned it is used in ATF service, why is this?

Please click here to offer your response. Reference Question #5073
Response 1: The name "hammer" blind valve actually comes from the Hamer Line blind series of blinds. The Hamer ...

Question 5074: What is IBR? When we will go for IBR approval for pipes and at what temperature and pressure.

Please click here to offer your response. Reference Question #5074
Response 1: If you are in India IBR stands for Indian Boiler Regulations. They regulate and certify boiler equipment ...

Question 5075: What is the difference between jacketed piping and steam or electrical traced piping? And when they are used.

Please click here to offer your response. Reference Question #5075
Response 1: Jacketed piping is where you fabricate a pipe inside a larger pipe. Spacers are mounted (welded) on to the OD of ...

Question 5076: What is the difference between metallic and non metallic gaskets? And where are they used.

Please click here to offer your response. Reference Question #5076
Response 1: ASME B-16.5 - Pipe Flanges and Flanged Fittings, lists 16 different types of gaskets. In this listing ...

Question 5077: How much should be the free run distance in upstream and down stream distance in orifice meter in case of ...

Please click here to offer your response. Reference Question #5077
Response 1: A high degree of turbulence, such as what would be detected immediately downstream of an elbow, will have an ...

Question 5078: What is NPSH in pumps?

Please click here to offer your response. Reference Question #5078
Response 1:NPSH is an acronym for Net Positive Suction Head. The Hydraulic Institute defines NPSH as the total suction ...

Question 5079: Why pipes are standardized based on outside dia instead of inside dia? For example if ...

Please click here to offer your response. Reference Question #5079
Response 1: Nominal Pipe Size (NPS) does not match the pipe OD until you get into sizes in excess of ...

Question 5080: Where I can get details of pump piping? Any websites plz.

Please click here to offer your response. Reference Question #5080
Response 1: One of the best sites for pump design info is http://www.gouldspumps.com/cat_pf_0001.html.

Question 5081: In pump suction pipe t-type strainer is provided, can it be kept in horizontal plane? If not, which ...

Please click here to offer your response. Reference Question #5081
Response 1: What you are most likely referring to is a suction diffuser. This isa device that acts to distribute ...

Question 5082: In pump discharge why check valve is kept in upstream of any valve?

Please click here to offer your response. Reference Question #5082
Response 1: In situations in which the pump might experience repeated back surges, a check valve is installed ...

Question 5083: Can a gate valve & butterfly valve be used for flow regulation purpose? If not why?. Which valve ...

Please click here to offer your response. Reference Question #5083
Response 1: While the globe valve and needle valve (for small tubing lines) are typically selected for flow ...

Question 5084: What is the reason for using rods on sleepers? I heard that it is to reduce friction, but friction ...

Please click here to offer your response. Reference Question #5084
Response 1: This comes from designers or engineers theorizing about friction load and/or corrosion issues ...

Question 5085: Then what is the use of rod on sleeper?

Please click here to offer your response. Reference Question #5085
Response 1: You do not need rods on sleeper supports. As stated above, if the determination is made that ...

Question 5086: Can stainless steel flange be mated with carbon steel flange? If not, why? And how it can ...

Please click here to offer your response. Reference Question #5086
Response 1: Bolting or threading dissimilar metals together can create galvanic corrosion of the lesser ...

Question 5087: What is static electricity in pipes? How to avoid it?

Please click here to offer your response. Reference Question #5087
Response 1: Static electricity, or charge accumulation, is the result of charge generation not able to ...

Question 5088: How static electricity is formed in process pipe lines?

Please click here to offer your response. Reference Question #5088
Response 1: As a fluid moves through a pipeline it creates friction against the pipe wall. This friction creates ...

Question 5089: what are the basic types of steam traps and were they are used?

Please click here to offer your response. Reference Question #5089
Response 1: Please read the article, by William (Bill) M. Huitt, on steam that we have posted at ...

Question 5090: What is stub in and stub on connection in process pipeline? What is the difference and in which ...

Please click here to offer your response. Reference Question #5090
Response 1: There is no such thing in piping as a "stub-on." You can sometimes make a stub-in connection when ...

Question 5091: Will turbulence in pipe affect butterfly valves disc?

Please click here to offer your response. Reference Question #5091
Response 1: In most cases fluid flow should be calculated to operate at a Reynolds number within the range of ...

Question 5092: Is it necessary to keep 1.5D free run distance in upstream and down stream of valves? It is ...

Please click here to offer your response. Reference Question #5092
Response 1: This is not a requirement for valves.

Question 5093: What is the difference between y-type and t-type strainer? Y-type is usually used in small ...

Please click here to offer your response. Reference Question #5093
Response 1: Size for size the T-type, or basket strainer, can accommodate more flow than a ...

Question 5094: A bout the cooling tower I have a question as below:

Please click here to offer your response. Reference Question #5094
Response 1: Refer to http://www.advantageengineering.com, http://www.coolingtechnology.com/, http://www.c...

 

 

 

 





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