Streamlined hydrant sampler redesign: smaller, lighter, and less expensive

The TSC optimization team has successfully piloted a redesigned hydrant sampler for distribution system investigative sampling. The new design reduces the number of necessary parts, thereby making for a smaller, lighter, and less expensive device. The new design keeps the flow control valve (20 gpm) to enable easy calculation of the appropriate flushing time prior to sample collection. The pressure gage also remains in the design. However, the sampling arm has been eliminated and the same part of the sampler is now used for both flushing and sampling. Cam and groove fittings, similar to what firefighters use to connect their hoses, are used to easily attach and detach the flushing hose for an easy transition from flushing to sampling. The gate valve is used to reduce the flow rate from the 20 gpm flushing rate to a lower flow rate for filling a sampling container. Eliminating the sampling arm of the hydrant sampler cuts down on overall size and weight, and makes it easier to thread the sampler onto the hydrant, especially if the hydrant port is close to the ground. The TSC optimization team piloted the new design and concluded that it works just as well as, if not better than, the original version. See below for more information, including an example parts list. Contact Matt Alexander (alexander.matthew@epa.gov, 513-569-7380) or Tom Waters (waters.tom@epa.gov, 513-569-7611) for further information.

Redesigned Hydrant Sampler

Pilot testing the new hydrant sampler design

 

Hydrant Sampler Parts List.png

 

Example parts list for redesigned hydrant sampler:

Section of Sampler Item Photo Letter Quantity Per Sampler Average Unit Price Total Cost
Main Brass hydrant reducer (2.5″ FNST inlet by 1″ MNPT outlet) A 1 $31.49 $31.49
Main 1″ MNPT red brass nipple, closed threaded E 3 $5.70 $17.10
Main 1″ FNPT red brass tee B 1 $21.40 $21.40
Main 1″ FNPT brass gate valve F 1 $16.35 $16.35
Main Dole flow control valve, 20.0 gpm, 1″ FNPT inlet/outlet G 1 $32.47 $32.47
Main 1″ MNPT x 1″ ID red brass hose adapter J 1 $20.90 $20.90
Main #16 hose clamp for 1″ ID hose K 1 $0.99 $0.99
Main Thread sealant tape, PTFE, 3/4″ x 520″ 1 $1.44 $1.44
Main 1″ ID hose (reinforced PVC), per ft L 4 $1.54 $6.16
Main 1″ cam and groove fitting, polypropylene coupler, coupling type D, female coupler x FNPT connection type I 1 $6.94 $6.94
Main 1″ cam and groove fitting, polypropylene adapter, coupling type A, male adapter x FNPT connection type H 1 $2.64 $2.64
Pressure Gauge 1″ MNPT x 1/4″ FNPT chrome plated brass reducing bushing C 1 $5.70 $31.30
Pressure Gauge Pressure gauge, filled, 2.5″, 300 psi, SS D 1 $54.50 $54.50
Total estimated cost (w/out PRV): $244

 

If the static pressure in the distribution system exceeds 150 psi at a particular sampling site, a pressure-reducing valve (PRV) is recommended, as many of the parts in the sampler are rated to 150 psi or less. Here is an example parts list for the PRV and associated fittings:

Section of Sampler Item Photo Letter Quantity Per Sampler Average Unit Price Total Cost
PRV adapter Brass hydrant reducer (2.5″ FNST inlet by 1″ MNPT outlet) A 1 $31.49 $62.98
PRV adapter 1″ FNPT brass, water pressure reducing valve (PRV) M 1 $134.50 $134.50
PRV adapter 1″ FNPT brass union N 1 $36.70 $36.70
Main 1″ MNPT red brass nipple, closed threaded E 2 $5.70 $11.40
Total estimated cost (with PRV): $458
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