ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure

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asd23789 Commentator Join Date: Jun 2011 Posts: 63	ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure 09/15/2011 2:45 AM
	Dear all, in ASME B16.5 non mandatory appendix A, there is a section A3 regarding ceiling pressure. There are some points which i dont understand? A) how the celiling pressure is determined? B) The ceiling pressure-temperature values set an upper bound for high-strength materials and are imposed to limit deflection. what are these high strength materials? C) The rules for establishing pressure-temperature ratings include consideration of ceiling pressures pc that effectively set limits on the selected stress. what are the selected stresses? is it referred from A2.2 or A2.3 or ? Please help. Regards ASD23789 __________________ The light of blindness of knowledge is yet to reach me, forget being clever.
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#1 "Re: ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure" by Abdel Halim Galala on 09/16/2011 11:56 AM (score 3)

Abdel Halim Galala

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Re: ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure

09/16/2011 11:56 AM

● From ASME B16.5-2009, Tables 2.1, 2.2 & 2.3; the following table with values are gathered as an example for Working Pressure by Class (bar) at Temp. 100 ^oC:

Group	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
1.1	17.7	46.6	62.1	93.2	139.8	233	388.3
1.2	17.7	51.5	68.7	103	154.6	257.6	429.4
1.3	17.4	45.3	60.5	90.7	136	226.7	377.8
1.4	14.9	38.8	51.8	77.7	116.5	194.2	323.6
1.5	17.7	47.9	63.9	95.9	143.8	239.7	399.5
1.7	17.7	51.5	68.7	103	154.6	257.6	429.4
1.9	17.7	51.5	68.6	103	154.4	257.4	429
. 1.10	17.7	51.5	68.7	103	154.6	257.6	429.4
1.11	17.7	51.5	68.7	103	154.6	257.6	429.4
1.13	17.7	51.5	68.7	103	154.6	257.6	429.4
1.14	17.7	51.5	68.7	103	154.6	257.6	429.4
1.15	17.7	51.5	68.7	103	154.6	257.6	429.4
1.17	17.7	50.4	67.3	100.9	151.3	252.2	420.4
1.18	17.7	51.5	68.7	103	155	258	429
2.1	15.7	40.9	54.5	81.7	122.6	204.3	340.4
2.2	16.2	42.2	56.3	84.4	126.6	211	351.6
2.3	13.3	34.8	46.4	69.6	104.4	173.9	289.9
2.4	17	44.2	59	88.5	132.7	221.2	368.7
2.5	17.4	45.3	60.4	90.6	135.9	226.5	377.4
2.6	16.5	43.1	57.5	86.2	129.3	215.5	359.2
2.7	16.6	43.4	57.9	86.8	130.2	217	361.6
2.8	17.7	50.7	48.9	101.3	152	253.3	422.2
2.9	16.5	43.1	57.5	86.2	129.3	215.5	359.2
. 2.10	14.4	37.5	50	75.1	112.6	187.7	312.8
2.11	17.4	45.3	60.4	90.6	135.9	226.5	377.4
2.12	14.4	37.5	50	75.1	112.6	187.7	312.8
3.1	17.7	50.9	67.8	101.7	152.6	254.4	423.9
3.2	12.7	33.1	44.1	66.2	99.3	165.5	275.8
3.3	6.1	15.8	21.1	31.7	47.5	79.2	132
3.4	13.8	35.9	47.9	71.9	107.8	179.7	299.5
3.5	17.7	51.5	68.7	103	154.6	257.6	429.4
3.6	17.5	45.6	60.8	91.2	136.9	228.1	380.1
3.7	17.7	51.5	68.7	103	154.6	257.6	429.4
3.8	17.7	51.5	68.7	103	154.6	257.6	429.4
3.9	17.7	51.5	68.7	103	154.6	257.6	429.4
. 3.10	17.7	51.5	68.7	103	154.6	257.6	429.4
3.11	15.7	41.1	54.7	82.1	123.2	205.3	342.1
3.12	16.3	42.5	56.7	85.1	127.6	212.7	354.5
3.13	17.7	48.2	64.2	96.3	144.5	240.8	401.4
3.14	17	44.3	59	88.6	132.8	221.4	369
3.15	14.5	37.8	50.4	75.6	113.4	189	315
3.16	16.7	43.5	58	87	130.5	217.5	362.4
3.17	13.5	35.3	47.1	70.6	105.9	176.5	294.2
3.19	17.7	51.5	68.7	103	154.6	257.6	429.4
Max. value	17.7	51.5	68.7	103	154.6	257.6	429.4

● Table A-1, Rating Ceiling Pressure Pc (bar), by Class (bar) at Temp. 100 ^oC:

………..……..	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
Pc	17.7	51.5	68.7	103	154.6	257.6	429.4

● By comparing the prescribed max. values at Temp. 100 oC (as an example) with values extracted from Table A-1 of Appendix A for Rating Ceiling Pressure pc, by Class (bar) at Temp. 100 oC, we find the both values are the same (reply to your question A. How the ceiling pressure is determined?)

● The high strength material are that belong to bold groups with rating ceiling pressure, pc (reply to your question B. What are these high strength materials?

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asd23789 Commentator Join Date: Jun 2011 Posts: 63	#2 In reply to #1 Re: ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure 09/17/2011 1:51 AM
	Thank you Sir Regards ASD23789 __________________ The light of blindness of knowledge is yet to reach me, forget being clever.
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stylee_eng Commentator Join Date: Jul 2011 Posts: 63	#3 In reply to #1 Re: ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure 09/24/2011 2:55 AM
	thank you Abdel halim for your support
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sachin_rastogi_in Power-User Join Date: Jul 2008 Location: India Posts: 111	#4 In reply to #1 Re: ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure 10/13/2014 3:28 AM
	Hello Abdel, Fully agreed with your good and specific approach just as your previous posts. This is what I expected. Is there any other practical significance of Ceiling Pressure in Piping. Regards Material Er. __________________ Be simple and specific for a great success in Life
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#1 "Re: ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure" by Abdel Halim Galala on 09/16/2011 11:56 AM (score 3)

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ASME-b16.5- Non Mand Append. A-sec A3- Ceiling Pressure

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