Vacuum Assisted Boiler Feed

Input

Load

Usable Storage in Minutes

Calculations

GPM

Duplex Pumps

Single Pump

Auto Receiver Size Gallon Tank (autocalculated)

Input

Max. Boiler Operating Pressure in PSIG

Lift in Feet

Friction Loss in PSIG Use Our Calculator Manually Calculate

FOR MANUAL FRICTION LOSS CALCULATIONS (Based on Maximum Velocity of 6 ft/sec.)
Inputs:
L =	Linear length of pipe in feet
D =	Diameter of pipe in inches
F =	Friction factor from the table 1. (in feet per 100 feet of pipe, based on size to be used)
FL =	Friction Loss = (Equivilent Length of pipe for all fittings..... [from table: 2] _______+ L)(F/100)/2.31 = ____________ in PSIG
Example:
Screwed Fittings for Nominal 1 inch pipe: L = 175 feet. Fittings: (1) regular 90 Ell + (1) gate valve + (1) tee branch + (1) swing check = 5.2 + 0.84 + 6.6 + 11.0 = 23.64 equivelent feet FL = (23.64 + 175)(.165)/2.31 = 14.2 PSIG Now enter 14.2 PSIG in the Friction Loss in PSIG input box

Table 1: For F @ 6.0 Ft/Sec
Nominal Pipe Size	1/2	3/4	1	1-1/4	1-1/2	2	2-1/2	3	4
Pipe Diameter for Pump GPM	<6 pgpm	<10 pgpm	<16 pgpm	<28 pgpm	<38 pgpm	<60 pgpm	<90 pgpm	<140 pgpm	<240 pgpm
F in Ft/100 Ft of Pipe	30.9	23.0	16.5	11.9	9.78	6.90	5.82	4.51	3.21

Fitting	Attach	Mtl.	1/4	3/8	1/2	3/4	1	1-1/4	1-1/2	2	2-1/2	3	4
Table 2: Equivalent Length of Straight Pipe in Ft for Various Fittings for Turbulent Flow
Regular 90 Ell	Scrd	Stl	2.3	3.1	3.6	4.4	5.2	6.6	7.4	8.5	9.3	11	13
		CI										9.0	11.0
	Flgd	Stl			.92	1.2	1.6	2.1	2.4	3.1	3.6	4.4	5.9
		CI										3.6	4.8
Long Radius 90 Ell	Scrd	Stl	1.5	2.0	2.2	2.3	2.7	3.2	3.4	3.6	3.6	4.0	4.6
		CI										3.3	3.7
	Flgd	Stl			1.1	1.3	1.6	2.0	2.3	2.7	2.9	3.4	4.2
		CI										2.8	3.4
45 Ell	Scrd	Stl	.34	.52	.71	.92	1.3	1.7	2.1	2.7	3.2	4.0	5.5
		CI										3.3	4.5
	Flgd	Stl			.45	.59	.81	1.1	1.3	1.7	2.0	2.6	3.5
		CI										2.1	2.9
Tee Line	Scrd	Stl	.79	1.2	1.7	2.4	3.2	4.6	5.6	7.7	9.3	12.0	17.0
		CI										9.9	14.0
	Flgd	Stl			.69	.82	1.0	1.3	1.5	1.8	1.9	2.2	2.8
	CI											1.9	2.2
Tee Branch	Scrd	Stl	2.4	3.5	4.2	5.3	6.6	8.7	9.9	12.0	13.0	17.0	21.0
		CI										14.0	17.0
	Flgd	Stl			2.0	2.6	3.3	4.4	5.2	6.6	7.5	9.4	12.0
	CI											7.7	10.0
180 Return Bend	Scrd	Stl	2.3	3.1	3.6	4.4	5.2	6.6	7.4	8.5	9.3	11.0	13.0
		CI										9.0	11.0
	Flgd	Stl			.92	1.2	1.6	2.1	2.4	3.1	3.6	4.4	5.9
		CI										3.6	4.8
	Lg Rad	Stl			1.1	1.3	1.6	2.0	2.3	2.7	2.9	3.4	4.2
	Flgd	CI										2.8	3.4
Globe Valve	Scrd	Stl	21.0	22.0	22.0	24.0	29.0	37.0	42.0	54.0	62.0	79.0	110.0
		CI										65.5	86.0
	Flgd	Stl			38.0	40.0	45.0	54.0	59.0	70.0	77.0	94.0	120.0
	CI											77.0	99.0
Gate Valve	Scrd	Stl	.32	.45	.56	.67	.84	1.1	1.2	1.5	1.7	1.9	2.5
		CI										1.6	2.0
	Flgd	Stl								2.6	2.7	2.8	2.9
	CI											2.3	2.4
Angle Valve	Scrd	Stl	12.8	15.0	15.0	15.0	17.0	18.0	18.0	18.0	18.0	18.0	18.0
		CI										15.0	15.5
	Flgd	Stl			15.0	15.0	17.0	18.0	18.0	21.0	22.0	28.0	38.0
	CI											23.0	31.0
Swing Check Valve	Scrd	Stl	7.2	7.3	8.0	8.8	11.0	13.0	15.0	19.0	22.0	27.0	38.0
		CI										22.0	31.0
	Flgd	Stl			3.8	5.3	7.2	10.0	12.0	17.0	21.0	27.0	38.0
	CI											22.0	31.0
Coupling or Union	Scrd	Stl	.14	.18	.21	.24	.29	.36	.39	.45	.47	.53	.65
		CI										.44	.52


Bell Mouth Inlet		Stl	.04	.07	.10	.13	.18	.26	.31	.43	.52	.67	.95
		CI										.55	.77


Square Mouth Inlet		Stl	.44	.68	.96	1.3	1.8	2.6	3.1	4.3	5.2	6.7	9.5
		CI										5.5	7.7


Re-entrant Pipe		Stl	.88	1.4	1.9	2.6	3.6	5.1	6.2	8.5	10.0	13.0	19.0
Re-entrant Pipe		CI										11.5	15.5
Y Strainer				4.6	5.0	6.6	7.7	18.0	20.0	27.0	29.0	34.0	42.0

Calculations

Minimum Pump Discharge Pressure (PSIG)

Input

Vacuum Producer Sizing CFM

Calculations

New System

Old System

Skidmore Standard

FOR MANUAL FRICTION LOSS CALCULATIONS(Based on Maximum Velocity of 6 ft/sec.)

Table 1: For F @ 6.0 Ft/Sec

Table 2: Equivalent Length of Straight Pipe in Ft for Various Fittings for Turbulent Flow

FOR MANUAL FRICTION LOSS CALCULATIONS
(Based on Maximum Velocity of 6 ft/sec.)