EDS 6E - Page 1 Careful calculation of the total dynamic head (TDH) is one of the most important factors in selecting the proper size of a Chempump
DETERMINING TOTAL DYNAMIC HEAD The total dynamic head of a water system must be considered when determining the size of pumping equipment to be installed
TOTAL HEAD, N.P.S.H. AND OTHER CALCULATION EXAMPLES Jacques Chaurette p. eng., www.lightmypump.com June 2003 Situation Water at 150 °F is to be pumped from a
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Mole Calculation Practice Worksheet. Answer the following questions: 1). How many moles are in 25 grams of water? 2). How many grams are in 4.5 moles of Li2O? 3). How many molecules are in 23 moles of oxygen? 4). How many moles are in 3.4 x 1023 mole
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Mole Calculation Worksheet. W 340. Everett Community College Tutoring Center. Student Support Services Program. 1). How many moles are in 40.0 grams of water? 2). How many grams are in 3.7 moles of Na2O? 3). How many atoms are in 14 moles of cadmium?
THE COMPONENTS OF TOTAL HEAD This chapter will introduce some of the terminology used in pumping systems. The components of Total Head will be examined one by one
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SimplifiedTotalDynamicHead(TDH)CalculationWorksheet ! Determine(Maximum ... (Ft of head/1 ft of Pipe) ... revised&plan&and&TDH&calculation&worksheet&for
Pump technology terms Depending on the Reynolds number, the flow passing through a pipe shows specific, typical flow patterns with different physical properties
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ANSI/ASP-7 2006 Specifies three methods for determining the maximum system flow rate. The following simplified TDH calculation is one of the methods specified.
Simplified Total Dynamic Head (TDH) Calculation Worksheet Determine Maximum System Flow Rate:
Minimum Flow Rate Required: 35 gpm per skimmer
1. Calculate Pool Volume: _____________ x _____________ x 7.48 (gal./cubic foot) = ______________ (Surface Area)
(Average Depth)
(Volume in gallons)
2. Determine preferred Turnover Time in hours: ____________ x 60 (minutes / hour) = ______________ (Hours)
(Turnover in Minutes)
3. Determine Max Flow Rate: __________ / __________ = __________ + __________ = ____________ (Volume in gallons) (Turnover Minutes)
(Pool Flow Rate) (Feature Flow Rate)
(System Flow Rate)
4. Spa Jets: __________ x __________ gpm per jet = ___________ flow rate. (Number of jets)
(Jet Flow)
(Total Jet flow Rate)
(For single pump pool/spa combo, use the higher of No. 3 or No. 4 in the following calculations for the pool & spa)
Determine Pipe Sizes: Branch Piping to be ______ inch to keep velocity @ 6 fps max. at ______ gpm Maximum System Flow Rate. Trunk Piping to be ______ inch to keep velocity @ 8 fps max. at ______ gpm Maximum System Flow Rate. Return Piping to be ______ inch to keep velocity @10 fps max. at ______ gpm Maximum System Flow Rate. Determine Simplified TDH: 1. Distance from pool to pump in feet: ___________ 2. Friction loss (in suction pipe) in ____ inch pipe per 1 ft. @ ____ gpm = ____ (from pipe flow/friction loss chart) 3. Friction loss (in return pipe) in ____ inch pipe per 1 ft. @ ____ gpm = ____ (from pipe flow/friction loss chart) 4. Length of suction pipe ______ x ft. of head/1 ft of pipe ______ = TDH suction pipe ______ 5. Length of return pipe ______ x ft. of head/1 ft of pipe ______ = TDH return pipe ______ TDH in Piping:__________ Filter loss in TDH (from filter data sheet): __________ Heater loss in TDH (from heater data sheet): __________ Total all other loss: __________ Total Simplified TDH: __________ Selected Pump and Main Drain Cover: Pump selection _______________________ using pump curve for Simplified TDH & System Flow Rate (Pump model and size in Horsepower)
Main Drain Cover _____________________ (System Flow Rate must not exceed approved cover flow rate) (Make and Model)
Notes: Minimum system flow based on minimum flow per skimmer of 35 gpm. Determine the Number and Type of Required In-Floor Suction Outlets: Check all that apply.
Simplified Total Dynamic Head (STDH) Complete STDH Worksheet – Fill in all blanks Total Dynamic Head (TDH) Complete Program or other calcs. Fill in required blanks on worksheet & attached calculations.
Notes: 1. If a variable speed pump is used, use the maximum pump flow in calculations. 2. For side wall drains, use appropriate side wall drain flow as published by the manufacturer. 3. Insert the manufacturer’s name and approved maximum flow. 4. See installation instructions for number of ports to be used. 5. In-floor suction outlet cover/grate must conform to most recent edition of ASME/ANSI A112.12.8 and be embossed with that edition approval. 6. Pump & Filter make, model and location can not change without submitting revised plans and TDH worksheet.
