Towers calculation program

Towers calculation program
This is part of the spreadsheet developed by us that we used in our beginnings for the design and calculation of this equipment. Today we do it with internationally recognized programs.
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1 - Constructive dates and vessel sketch

Sec	Component	Pr dis	T dis	Sa	ID	E	CA
		[psi]	[°F]	[psi]	[ft]	------	[plg]
1	Head	220		13800	5,5	1	0,0625
	Course1	220	100	13800		1	0,0625
2					5,5
	Course2	220	100	13800		1	0,0625
3					5,5
	Course3	220	100	13800		1	0,0625
4					5,5
	Course4	220	100	13800		1	0,0625
5					5,5
	Course5	220	100	13800		1	0,0625
6					5,5
	Course6	231,9	100	13800		1	0,0625
7					5,5
	Head	231,9	100	13800		1	0,0625
8	Skirt	0	0	13800	11,05	0,8	0,0625

2 - Design data

		P, Design Pressure, [psi]=	400
		Td, Design Temperature, [°F]=	700
		Head & shell materials	SA515,55
		Sd, allowable stress, [psi]	13800		ASME II Sec. D
		Sa, amb. allowable stress, [psi]	13800		ASME II Sec. D

2.1 - Minimun design temperature

	The following ones are the minimum design temperatures accepted for
	the Code (for which it is not necessary to carry out impact test).
	They are obtained with the calculated thickness values and the calculate
	stress.

		For the shell:				T [in]	Stress [psi]
		Min temp.at Sa (Fig UCS-66), [° F]		-20		0,875
		Min. temp. at P(Fig UCS-66.1), [° F]		-20			10744

		First head:
		Min temp.at Sa (Fig UCS-66), [° F]		-20		0,875
		Min. temp. at P(Fig UCS-66.1), [° F]		-20			10509

		Second head:
		Min temp.at Sa (Fig UCS-66), [° F]		-20		0,875
		Min. temp. at P(Fig UCS-66.1), [° F]		-20			10509

3 - Shell calculation

			E, Joint efficiency= 0,85
			T', suggested thickness, [in.]= 0,875
			T, adopted thickness, [in.]= 0,875

	3.1 - Thickness calculation (internal pressure):

		=(P(D/2+CA)/(SE-0.6*P)) por UG-27 (c)(1)
		=(400,0(36,000/2+0,063)/(117000,85-0.6*400,0))

		Required thickness by design pressure, [in] = 0,7445
		Required thickness with corrosion, [in] = 0,8070

	3.2 - M.A.W.P. calculation:

		=(SE(T-CA))/((D/2+CA)+0.6*(T-CA)) por UG-27 (c)(1)
		=(117000,85(0,875-0,063))/((36,000/2+0,063)+0.6*(0,875-0,063))
		M.A.W.P, corrosion condition, [psi] = 435,50
		Input design pressure, [psi] = 400,00

		M.A.W.P., new and cold condition:
		=(SAET)/((D/2)+0.6*(T)) por UG-27 (c)(1)
		=(120000,850,875)/((36,000/2)+0.6*(0,875))
		M.A.W.P., new and cold (70 °F), [psi] = 481,70
		Hydrotest Pressure Based on MAWP, per UG-99 (b), [psi] = 670,00
		Stress at corroded thickness and design pressure, [psi] = 10744

3.5-Thickness calculation (wind)

All the thickness in [in]:

tr1=q1/Sa/E+CA= windward required thickness

tr2=q2/Sa/E+CA= leeward required thickness

tr3=required thickness by pressure (See equation 3.1)

tr= required thickness (the bigger of tr1, tr2 or tr3)

ta= adopted thickness

			tr1	tr2	tr3	tr	ta
Section	Component
1	Head		--------	--------	0,5894	0,5894	5/8
	Course1				0,5937	0,5936	5/8
2			0,3383	0,1013
	Course2				0,5937	0,5936	5/8
3			0,3998	0,1870
	Course3				0,5937	0,5936	5/8
4			0,5104	0,3217
	Course4				0,5937	0,6647	3/4
5			0,6648	0,5019
	Course5				0,5937	0,8583	7/8
6			0,8584	0,7230
	Course6				0,6228	1,0948	1 1/8
7			1,0949	0,9870
	Head		--------	--------	0,6288	0,6288	1 1/8
			1=	1,2181			*
8	Skirt	3=	0,2945	0,4125	=2	1,2180	1 1/4

Skirt required thickness:			* It not equal to adopted int. pres. thickness=0,6250
1=(lw+ld)/Sa/E+CA) in skirt-shell union
2=(lw+ld)/Sa/E+CA) at base
3=(lw-ld)/Sa/E+CA) at base

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