"

• Tested, approved and certified

• Keeps pressure surges below :1.50 PSI
• 500,000 cycles strong
• Lifetime guaranteed

Sioux
Arresters &
Trap Primers Chief
"

What is Water Hammer?

Although water hammer is a subject usually left up to plumbing engineers, the effects of water hammer
must be dealt with every day by plumbing contractors everywhere. Water hammer is easily recognized
by the banging or thumping noise that's heard when valves are shut off. Although this is an easy way
to recognize the problem, water hammer doesn't always
make these telltale noises. Water hammer occurs when the
flow of moving water is suddenly stopped by a closing
valve. This sudden stop results in a tremendous spike
of pressure behind the valve which acts like a tiny
explosion inside the pipe. This pressure spike reverberates
throughout the plumbing system, rattling and shaking pipes,
until it is absorbed. Normally, a sufficient pocket of air will absorb
such a pressure spike, but if no pocket of air is present, expensive fixtures and
appliances within the plumbing system will be damaged as they are left to absorb
this pressure spike.

Why Air Chambers Don't Work

It used to be thought that an air chamber, or
capped stand pipe, was an effective solution
to controlling water hammer. However, within
an air chamber, nothing separates the air from
the water. It only takes a few short weeks
before the air is absorbed into the water,
leaving the air chamber waterlogged and
completely ineffective. Laboratory tests
confirm that the air is depleted by simple air
permeation and by interaction between static
pressure and flow pressure. In the diagram
shown, (right) notice the difference in water
level between "Static Line Pressure" and Static line Flow ShockjTurbulence Post-cycle
pressure (air is depleted) (air is depleted) Static Level
"Post-cycle Static Level."

Controlling Water Hammer

The most effective means of controlling water hammer is a measured,
compressible cushion of air which is permanently separated from the
water system. Sioux Chief arresters employ a pressurized cushion of air
and a two o-ring piston, which permanently separates this air cushion
from the water system. When the valve closes and the water flow is
suddenly stopped, the pressure spike pushes the piston up the arrester
chamber against the pressurized cushion of air. The air cushion in the
arrester reacts instantly, absorbing the pressure spike that causes
water hammer. Although arresters are typically tested to 10,000 cycles,
Sioux Chief arresters have been independently lab tested to withstand
500,000 cycles without failure. All Sioux Chief arresters are guaranteed
to control water hammer for the lifetime of the plumbing system.

For more information about controlling water hammer see our Engineer
Report or our Water Hammer F.A.Q. brochure. Call or visit our web site
to request a copy.
 Sizing Be Placement
Fixture Units The fixture unit values shown in this table represent the standard
Type of ratings used by engineers to size water distribution systems as
FIxture
Supply Control Public Private
Total C.W. H.W. Total C.W. H.W. well as water hammer arresters. Match fixture units in the table to
Water Closet Aush Valve 10 10 - 6 6 - the Hydra-Rester with the corresponding fixture unit capacity.
Water Closet Rush Tank 5 5 - 3 3 -
Pedestal Urinal Rush Valve 10 10 - - - - Example
Stall or Wall Urinal Rush Valve 5 5 - - - -
Stall or Wall Urinal Rush Tank 3 3 - - - - Cold Water
Lavatory Faucet 2 1-1/2 1-1/2 1 1 1 Equal to 26 Fixture Units
Bathtub Faucet 4 2 3 2 1-1/2 1-1/2 Requires - B Unit
Shower Head Mixing Valve 4 2 3 2 1 2 Sioux Chief's 653-8 or 653-8S
Bathroom Group Rush Valve Closet - - - 8 8 3
Bathroom Group Aush Tank Closet - - - 6 6 3 Hot Water
Separate Shower Mixing Valve - - - 2 1 2 Equal to 6 Fixture Units
Service Sink Faucet 3 3 3 - - - Needs - A Unit
Laundry Tubs (1-3) Faucet - - - 3 3 3 Sioux Chief's 652-A or 652-AS
Combination Fixture Faucet - - - 3 3 3

Multi-fixture Branch Lines

Rule :1: Branch Lines of 20 Feet or Less

The Hydra-Rester should be placed at the end of
the branch line between the last two fixtures
served, as shown. (right) Select required model
using fixture unit sizing (above).

Rule 2: Branch lines over 20 feet Hydra·Resters

An additional Hydra-Rester (V) should be placed
as shown. (right) The additional unit should be
placed at the midpoint of the run longer than 20
feet. Select required model(s) using fixture unit
sizing (above). The sum ofthe fixture unit ratings
of units X and V combined, shall be equal to or
greater than the demand of all branches.

Water Hammer Arrester Cross Reference

MANUFACTURER ARRESTER SIZE
(Trade Name) AA A 8 C D E F
SIOUX CHIEF
660 Series 652·A 653·8 654-C 655-D 656·E 657·F
(Mini-Rester, Hydra-Rester)
JOSAM (Absorbotron) -NA- 75001 75002 75003 75004 75005 75006
J.R. SMITH (Hydrotrol) -NA- 5005 5010 5020 5030 5040 5050
P P P (MM, SC Series) MM-500 Series SC500 SC750 SC1000 SC1250 SC1500 SC2000
WADE (Shokstop) -NA- W-5 W-10 W-20 W-50 W-75 W-100
WATTS (05, 15 Series) 05 Series 15- i h" 15-%" 15 -1" 15-1%" 15 _11h" 15- 2"
WILKINS (1250 Series) -NA- 1250-A 1250-8 125O-C 1250-D 1250-E 1250-F
ZURN (Shoktrol) -NA- 100 200 300 400 500 600
 Hydra-Rester®
Engineered Water Hammer Arrester

9 1010
Certified by the American Society
of Sanitary Engineering to the
ANSIjASSE 1010-2004 Standard.

Lifetime cycle tested at U.S. Testing Laboratories

in Fairfield, NJ, to withstand 10,000 shock cycles.
Factory tested to withstand 500,000 cycles,
without failure. (#654-C tested)

All Hydra·Resters~

Compact Size
Allows for installation
in a 2x4 wall cavity.
feature:
Cold rolled and
spin closed
chamber
I
Installation Angle
Install upright, horizontally,
or any angle in between. Dual O-ring, -
polypro piston

Sealed Wall Installation Seamless cold J

Approved for installation with formed reduction
no access panel required.

I-- B ---j - -Cold rolled and spin closed f-B--1

seamless chamber end--

--11--- Pressurized air cushion ----lI-

Type L copper tub.e---/I

Polypro piston with two EPDM O-rings

.---H--lullric'3ted with Dow-Corning, 111
FDA approved silicone compound.

Seamless cold
reduction
"\\--//._f,um.prl Heat sink
length
Lead-free
solder joint
~tandard copper Seamless cold
MIP adapter formed reduction

Maximum working temp .......... _. 250 of

Maximum working pressure ... 350 PSIG
Burst tested to .................. 2,900 PSIG

DISTRIBUTED BY

tel: 1-800-821-3944
fax: 1-800-758-5950
www.siouxchief.com Sioux
SCv1-4/04 HYORA-RESTER © 2004 SIOUX CHIEF MFG.
P.O. Box 397
24110 South Peculiar Drive
Peculiar, Missouri 64078 U.S.A. .Chief