ANSI v/s PN Rating flange - Comparision table

[Darji Nilesh (Mumbai - Machinery)]

Can any one provide me a subject table.

 

Nilesh.

[Agrawal Sunil (Mumbai -Stequ)]

Please find below the comparision:

 

PN         ANSI rating

20                             150 #

50                             300 #

68                             400 #

100                          600 #

150                          900 #

250                          1500 #

420             2500 #             

 

Source: Handbook of TC

 

I am not sure about reliability of above data and hence I request other member to contribute.

 

 

Best regards,

 

Sunil S. Agrawal

Static Equipment Dept. (STEQU)

Engineering & Design Tecnimont ICB

101/102, Interface-11, Link Road, Malad (w), Mumbai - 400 064 ( +91.22.6777.7237 * s.ag...@ticb.com

---

[Desai Jignesh (Mumbai - Piping)]

Dear Nilesh,

 

PN20 = 150 LB

PN50 = 300 LB

PN68 = 400 LB

PN100 = 600 LB

PN150 = 900 LB

PN250 = 1500 LB

PN420 = 2500 LB

 

I got the above details for DIN PN rating to ANSI #  from one of the specification. it may be helpful to you.

 

Regds/Jignesh

[Agrawal Sunil (Mumbai -Stequ)]

Can any one guide me what is the ANSI equivalent rating for PN below 20 (PN 2.5, PN 6, PN 10, PN 16)?

Thank you…

 

Best regards,

 

Sunil S. Agrawal

Static Equipment Dept. (STEQU)

Engineering & Design Tecnimont ICB

101/102, Interface-11, Link Road, Malad (w), Mumbai - 400 064 ( +91.22.6777.7237 * s.ag...@ticb.com

[Kannan....@linde-le.com]

To be precise, we cannot really equate the two different standards, even above 150# of ANSI. The best reliable action will be to look into EN 1092 part 1 to 4 , and look at the pressure / temp limitation table. Take note of the name diff. Working pressure vs. Allowable pressure. And the special note on agreement between manuf. and purchaser.

The above is due to the reason that to my awareness, I have not found any official standard stating the equivalent of each other. All equivalent tables are provided by only manufacturers who may or may not guarantee what they write in thier catalog explicitly. Just to have a general idea such tables can help but not for practical technical solutions.

It would be interesting to just have a look at the dimension variation of a choosen flange between EN and BS and ASME.

I like to make a reference here of a case I came across. A butterfly valve manufacturer who supplied sizes of 36", 48", 56", 64" ANSI double flanged ends. I found the flanged end OD and thickness was reduced by 40mm on an average, just around 6 to 7 mm near the bolt hole....!   When asked he says the flange will not fail even at full rating condition. By which he simply violates the ANSI and says still he can satisfy the PT limits of ANSI and it is his standard practise to follow the reduced dimension. The valves are ready for dispatch and now considering the big cost involved in cancelling the order and time delay, it had to be approved with the gaurantee letter.  In practice it does not have any problems because the operating conditions are below the rating limits, but not a safe design. Moreover it is a big cost saving for the manufacturers considering such big material, weight, machining cost reduction. The vendor is Tyco.

So take caution while considering such equivalent ones and even the ones where even the ANSI is violated as we tend to overlook the standard dimensions on the drawings.

Regards,
Kannan
Germany.

"Agrawal Sunil \(Mumbai -Stequ\)" <s.ag...@ticb.com> Sent by: piping...@yahoogroups.com 15/10/2008 06:33 Please respond to piping...@yahoogroups.com

To <material...@googlegroups.com> cc <piping...@yahoogroups.com> Subject [piping_valves] RE: 934] RE: 932] ANSI v/s PN Rating flange  - Comparision table

[alireza alavi]

Dear my freinds ,   Could you please help me to undrestand how is heat transfer & boil off rate of Nitrogen or Oxygen liquids in cryogenic tanks .   any experience or reference would be so appreciated   Best regards Alavi

[CKPurohit]

Dear Group,

 

I need help to find out how to reduce the exposure time for heavy wall thickness RT (above 4" thickness and ID of vessels 4 meter) .

 

Composite film is one of the option. Any other idea ?

 

I heard from my client that there are accelerators available which can be used for developing the film to compensate the reduce time of exposure.

 

We are using Co-60.

 

Regards.

CK

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[raghavendra pemmaraju]

Dear CKP, you can use combination of two sources together ( unsharpness is not an issue since the thickness is 100mm and SFD 2m) this will increase the Curie strength of the source. Also while developing you may increase the Temperature of the developer to 2 deg.C sothat an imporvement of 0.2 H&D of optical density can be had, proportionately you can reduce the exposure time. When you use Combination of films ( double film with minimum optical density of 1.3H&D per film), you are in tern effectively reducing the exposure time by 40% when compared to that of a single film with 2.0H&D optical density.   you can even try to use high speed films such as AGFA D8 provided you are achieving the required sensitivity. This will reduce further 30% of exposure time. Try the above remedies, all the best !   regards,   RPE --- On Thu, 10/16/08, CKPurohit <c...@knm-group.com> wrote:

[CKPurohit]

Dear RP,

 

We are using 75 Ci source Co-60. Another thing is vessel can not kept in enclosure and barricading area will be too large if we combine the source.

 

We are using the fast films.

 

I want to know on this accelerators for developing….

 

If somebody have some info pl come up…

 

Regards.

CK

[raghavendra pemmaraju]

Dear Raghuram and CK, usage of Copper screens will further double the exposure time since the intensification factor of Cu is less. Coming to composite screens, it depends on the Code based on which the RT is being done. ASME allows only metallic screens to be used.   There are no accelerators for development of films. Yes, there are linear accelerators and betatrons which produce high energy radiation interms of 4 to 12 MeV energy thus the exposure time being very less. As suggested, you may want to use Automatic film processor with developer temperature set at 28 to 30Deg.Celcius sothat the over all exposure time is reduced by 10 to 15%.   In case of panoramic exposures of Circ.seams where the source is being kept at the centre of the shell section, pl.note that the shell thickness of 100mm also need to be considered as shielding for calculating cordon off distances thus the optimisation can be achieved in barricading the vicinity of radiation zone.   I can suggest that during the circ.seam RT by panoramic technique, try to cover the adjacent long seams of either shells also thus in one exposure you are covering maximum weld. Do not forget to keep the IQIs at required positions as per the code requirements.     thanks and regards, RPE

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[pinakin jani]

Dear Chaitanya,   One more option is there to reduce your exposure time if you go for D8 faster than D7 film. Before using this film you should take RT on Plate and demonstrate the film which is having required sensitivity and contrast and for same you have to take approval from your client.   This will also reduce your exp. time nearly 35-40%. Regards,   Jani Pinakin

--- On Thu, 16/10/08, CKPurohit <c...@knm-group.com> wrote:

From: CKPurohit <c...@knm-group.com> Subject: [MW:1215] How to reduce the exposure time for RT To: material...@googlegroups.com

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