Rule 1 covers multiple fixture branch lines which do not exceed
20 feet length.
Sizing and Placement
Series 15M2
Explanation - Fixture unit sizing and selection table is used to
select the required PDI unit (water hammer arrestor).
Water
Hammer Arrestor
For Commercial/Residential Systems
Riser
Up to 20'
Rule 1
Typical Branch Line
As shown above, it has been established that the preferred location
for the water hammer arrestor is at the end of the branch line between
the last two fixtures served.
The location of the water hammer arrestor shown above applies to
branch lines that do not exceed 20 feet in length, from the start of the
horizontal branch line to the last fixture supply on this branch line.
When the branch line exceeds the 20 foot length, an additional water
hammer arrestor should be used. This practice is best defined by two
rules which have been established to cover the placement of water
hammer arrestors.
Features
• NPT solid hex brass adapter or solder end connection
for easy installation
• Approved for installation with no access panel required
• May be installed in new or existing plumbing systems with
a standard pipe tee vertically, horizontally or at any angle
• PDI Listed (PDI WH201)
• Maintenance free – unit piston is the only moving part
• Air pre-load is 60 psi (4.2 bar)
• Factory air charged and permanently sealed
15M2
Pre-charged
Air Chamber
Permanently
Sealed from
Water System
Operating Pressure: Designed to operate on all domestic and
commercial lines @150psi (10.6 bar) working pressure.
B
Materials
Bodies: Copper tubing
Pistons: Polypropylene
O-Ring: EPDM
Adapter: Brass
NPT Brass
Adapter
for Easy
Installation
Standards
Listed by IAPMO, ASSE 1010 approved, ANSI A112.261M
approved, PDI WH201 approved and certified.
A
Dimensions — Weight
DIMENSIONS
WEIGHT (lbs.)
A
Selection for Long Piping Runs
Sizing Table
The majority of sizing and selection applications will involve single and
multiple fixture branch lines. These are easily handled with the sizing
and selection table. The remainder of the applications involve individual runs of piping to a remote item of equipment. The properly sized
water hammer arrestor for such applications can be determined by
the tables below.
For Water Pressures up to 65psi
All sizing data in this section is based on flow velocities of 10 fps or
less. The certification testing was conducted with a velocity of 10 fps
to offer assurance that PDI approved units were capable of handling
shock of maximum intensity that may be encountered.
⁄2"
⁄4"
1"
1"
1"
1"
3
25'
50'
75'
100'
125'
150'
mm
in.
15M2-A
15M2-B
15M2-C
15M2-D
15M2-E
15M2-F
11⁄8
13⁄8
15⁄8
21⁄8
21⁄8
25⁄8
28.5
34.9
41.3
54.0
54.0
66.7
515⁄16
89⁄16
813⁄16
915⁄16
1211⁄16
115⁄32
150.9
218.0
223.5
252.5
322.5
283.5
0.5
0.9
1.3
2.0
2.3
2.7
0.2
0.4
0.6
0.9
1.1
1.2
15M2-AS
15M2-BS
15M2-CS
15M2-DS
15M2-ES
15M2-FS
11⁄8
11⁄8
13⁄8
21⁄8
21⁄8
21⁄8
210.0
254.0
317.5
280.0
343.0
406.5
81⁄4
10
121⁄2
11
131⁄2
16
28.5
28.5
34.9
54.0
54.0
54.0
0.44
0.54
0.92
1.63
1.98
2.32
0.2
0.2
0.4
0.7
0.9
1.1
mm
Water Hammer Arrestor
5
⁄2"
A
A
B
C
C
D
3
⁄4"
1"
11⁄4"
11⁄2"
2"
A
B
C
D
D
E
B
C
D
E
F
F
C
D
AE
F
AF
DF
D
E
F
CF
EF
FF
E
F
EF
FF
EFF
FFF
Water Hammer Arrestors
Over 65 psi and up to 85psi
LENGTH OF PIPE (ft)
NOMINAL PIPE DIAMETER - IN.
1
of Pipe
25'
50'
75'
100'
125'
150'
B
in.
NOMINAL PIPE DIAMETER - IN.
1
⁄2"
B
B
C
D
D
E
3
⁄4"
1"
11⁄4"
11⁄2"
2"
B
C
D
E
E
F
C
D
E
F
CF
CF
D
E
F
CF
DF
FF
E
F
CF
EF
FF
DFF
F
CF
FF
EFF
BFFF
FFFF
Sizing and Selection Table
Shock
SIZE
(DN)
Quick
Closure
Valve
in.
Long Run of Piping
1
Outlet
Solder
1
LENGTH OF PIPE (ft)
When long runs of piping are employed to serve a remote item of
equipment, the water hammer arrestor should be located as close as
possible to the point of quick closure. At this location, the water hammer arrestor will control the developed energy and prevent the shock
wave from surging through the piping system. A typical example of
placement is as shown.
(kgs.)
Threaded
⁄2"
3
⁄4"
1"
1"
1"
1"
Over 20'
Rule 2
Ideally, the flow pressure in branch lines serving fixtures should never
exceed 55psi. Pressure reducing valves should be installed to maintain
proper pressure. When flow pressures are 65 to 85psi the next size
water hammer arrestor should be selected. Refer to sizing table for
water pressure over 65psi.
Temperature Range: 33°F to 180°F (0.5°C to 82°C).
1
Explanation - Fixture unit sizing and selection table is used to
select the required PDI unit (water hammer arrestor). The sum of
the fixture unit rating of units X and Y shall be equal to or greater
than the demand of the branches.
15M2S
Pressure — Temperature
SIZE (DN)
Rule 2 covers multiple fixture branch lines which exceed 20 feet
in length.
A Watts Water Technologies Company
F-WHA 1050
/2"
/4"
1"
1"
1"
1"
3
MODEL
mm
Threaded
15
20
25
25
25
25
15M2-A
15M2-B
15M2-C
15M2-D
15M2-E
15M2-F
ORDER
CODE
MODEL
ORDER
CODE
CROSS
FIXTURE
UNITS
REF. PDI
STANDARD
0750150
0750151
0750152
0750153
0750154
0750155
1-11
12-32
33-60
61-113
114-154
155-330
A
B
C
D
E
F
Solder
0750140
0750141
0750142
0750143
0750144
0750145
15M2-AS
15M2-BS
15M2-CS
15M2-DS
15M2-ES
15M2-FS
USA: No. Andover, MA • Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ONT. • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
© 2010 Watts
watts.com
What is
Water Hammer?
Series 05
Series 150A
For Light Commercial/Residential Systems
For Residential Systems Only
Model 05H-M1
⁄4" (20mm) Hose Type
specially designed for
in-line use with
washing machines
3
3
⁄4" 05-QC
Dishwashers, clothes washers, fast closing positive shutoff
valves incorporated in the system, all contribute to creating
water shock which is not only annoying but damaging to
pipes and appliances. Watts Water Hammer Arrestors
incorporate a permanent pre-charged sealed air chamber to
absorb the shock. The sealed chamber prevents the loss of
air to the water and ensures long and trouble-free life. All
potential leak points are permanently sealed.
he noise from banging pipes is caused by shocks of
high speed water flowing in the piping system when
a fixture is suddenly closed. Sudden stoppage of the
water (a non-compressible liquid) flowing at a given pressure and velocity causes a surge or spike of pressure and
is called water hammer. When this occurs a pressure wave
travels back through the piping until it finds a point of relief.
T
Features
Features
5
⁄8" 05-C
• Economical and effective single fixture protection
against water pressure shock
• Pre-charged air chamber
• May be installed in concealed locations without access
panels
• Rechargeable
• Sealed in diaphragm
• Stainless steel chamber construction
• Factory air charged and not rechargeable
• May be installed in new or existing plumbing systems
vertically, horizontally or at any angle
5
Sizing and Placement
The fixture unit valve shown in the cold and hot water columns of Table A below are utilized in the sizing of water hammer arrestors.
Once the total number of fixture units has been calculated for the hot and cold water branch lines serving a group of fixtures, this number can
be applied to the sizing and selection Table B below to determine the appropriate size water hammer arrestor for the hot and cold branch lines.
Table B — Series 15M2 Sizing and Selection
Table A — Fixture Units Sizing Information
SIZE (DN)
WEIGHT IN FIXTURE-UNITS
TYPE OF SUPPLY
FIXTURE
Water Closet 1.66 PF
Water Closet 1.66 PF
Pedestal Urinal 1.06 PF
Stall or Wall Urinal
Stall or Wall Urinal
Lavatory
Bathtub
Shower Head
Bathroom Group
Bathroom Group
Separate Shower
Service Sink
Laundry Tubs (1-3)
Combination Fixture
CONTROL
Flush Valve
Flush Tank
Flush Valve
Flush Valve 1.06 PF
Flush Tank 1.06 PF
Faucet
Faucet
Mixing Valve
Flush Valve Closet
Flush Tank Closet
Mixing Valve
Faucet
Faucet
Faucet
PUBLIC
TOTAL C.W.
8
5
4
4
2
2
4
4
–
–
–
3
–
–
8
5
4
4
2
11⁄2
2
2
–
–
–
3
–
–
PRIVATE
H.W.
–
–
–
–
–
11⁄2
3
3
–
–
–
3
–
–
TOTAL C.W.
5
2.5
–
–
–
1
2
2
8
6
2
–
3
3
5
2.5
–
–
–
1
11⁄2
1
8
6
1
–
3
3
H.W.
–
–
–
–
–
1
11⁄2
2
3
3
2
–
3
3
CROSS FIXTURE UNITS
In.
mm
1
15
20
25
32
40
50
⁄2
3
⁄4
1
11⁄4
11⁄2
2
1-11
12-32
33-60
61-113
114-154
155-330
REF. PDI STANDARD
A
B
C
D
E
F
⁄8" 05-CXT
Pressure & Temperature
Operating Pressure: Designed especially for use in light
commercial or residential applications on lines up to 150psi
(10.6 bar) working pressure.
⁄8" 05-PEX-T
Temperature Range: 33°F to 180°F (0.5°C-82°C)
05-C For compression installation on ⁄2" CTS new or retrofit
Temperature Range: 33°F to 180°F (0.5°C - 82°C)
05-QC Arrestor offered with Quick-Connect Tee
Air Preload: 60psi (4.2 bar)
05H-M1 For inline use with washing machines
Standards
05-C-T For either 1⁄4" icemaker or 3⁄8" lav supply tube installation
Dimensions - Weight
in
05
05
05-CPVC
05-H
05H-M1
05-S
05-S
05-C
3
⁄8
1
⁄2
1
⁄2
3
⁄4
3
⁄4
1
⁄2
3
⁄4
5
⁄8
MODEL
1
05-PEX-T For either ⁄8" or ⁄2" inline PEX installation
For complete list of models, send for ES-05.
Straight Models
SIZE (DN)
Models
05-CXT For direct installation on supply stop either between stub out
and stop or between stop and supply tube
3
MODEL
Maximum Shock Pressure: 200psi (13.8 bar)
1
Certified to ASSE 1010 and listed by IAPMO.
CONNECTION TYPE
DIMENSION
mm
in.
10
15
15
20
20
15
20
16
1
NPT
NPT
CPVC
Hose
Hose
Sweat
Sweat
OD Comp.
1 ⁄4
11⁄4
11⁄8
2
33⁄16
1
1
11⁄4
MODEL
SIZE (DN)
CONNECTION TYPE
IPC-International Plumbing Code
609.10 Water Hammer. All building water supply systems in which
quick-acting valves are installed shall be provided with devices to
absorb the hammer caused by high pressures resulting from the
quick closing of these valves. These pressure-absorbing devices
shall be approved mechanical devices. Water pressure-absorbing
devices shall be installed as close as possible to quick-acting valves.
604.9 Water Hammer. The flow velocity of the water distribution
system shall be controlled to reduce the possibility of water hammer. A water hammer arrestor shall be installed where quick-closing
valves are utilized. Water hammer arrestors shall be installed in
accordance with the manufacturer's specifications. Water hammer
arrestors shall conform to ASSE 1010.
2
05-C-T
05-C-T
05-CXT
05-CXT
05-PEX-T
05-PEX-T
05-QC
05-QC
in
mm
1
8
10
10
16
10
15
15
20
⁄4
3
⁄8
3
⁄8
5
⁄8
3
⁄8
1
⁄2
1
⁄2
3
⁄4
OD Comp.
OD Comp.
OD Comp. x Reverse Comp. Nut
OD Comp. x Reverse Comp. Nut
PEX
PEX
Quick-Connect
Quick-Connect
SIZE
in.
150A
Water Hammer Arrestor Only
150A-HA Water Hammer Arrestor and Fitting
150HA
Fitting Only
1
⁄2"
⁄4"
3
⁄4"
3
CONNECTION TYPE
mm
15
20
20
NPT
Hose
Hose
WEIGHT
mm
in.
mm
lbs.
kgs.
32
32
29
50
81
25
25
32
1
133
140
118
162
170
140
124
143
0.34
0.36
0.10
0.48
0.60
0.30
0.08
0.40
0.15
0.16
0.05
0.20
0.27
0.14
0.04
0.18
5 ⁄4
51⁄2
411⁄16
63⁄8
611⁄16
51⁄2
47⁄8
55⁄8
DIMENSION
A
UPC-Uniform Plumbing Code
DESCRIPTION
B
Dimensions
NOMINAL
A
Pipe
Size
in.
mm
WEIGHT
1
15
3
⁄4
20
1
25
11⁄4
32
⁄2
B
in.
mm
in.
mm
lbs.
kgs.
23⁄4
3
213⁄16
31⁄16
21⁄4
21⁄4
35⁄8
33⁄32
70
77
72
78
58
58
93
104
413⁄16
413⁄16
413⁄16
413⁄16
411⁄16
411⁄16
73⁄8
93⁄4
122
122
122
122
119
119
187
247
0.17
0.17
0.17
0.18
0.12
0.12
0.4
0.57
0.07
0.07
0.07
0.08
0.05
0.05
0.18
0.26
3
150A-HA
B
Tee Models
2006 Plumbing Code Requirements
150A
Maximum Velocity: 10 fps (.93 mps)
05 For NPT threaded applications
A
For additional information, send for ES-15M2.
3
Models
Operating Pressure: Designed for residential/domestic
water systems on lines up to 150psi (10.6 bar) working
pressure.
B
A
LENGTH
Pipe
Up to
ft.
m
50
75
100
25
50
75
25
50
75
25
15.2
22.9
30.5
7.6
15.2
22.9
7.6
15.2
22.9
7.6
FLOW PRESSURE - PSI
psi
30
bar
2.11
150A
150A
150A
150A
150A
150A
150A
2-150A
2-150A
2-150A
psi
40
bar
2.81
›
›
›
›
›
›
›
›
—
›
psi
50
bar
3.52
›
›
2-150A
›
2-150A
›
›
›
—
›
For additional information, send for ES-150A.
4
and Number of 150A valves to install
psi
bar
psi
bar
60
4.22
70
4.92
›
›
›
›
›
›
›
›
—
›
›
2-150A
›
›
›
—
2-150A
—
—
›
psi
80
bar
5.62
›
›
›
›
›
—
›
—
—
—
psi
90
bar
6.33
2-150A
›
—
2-150A
—
—
›
—
—
—
psi bar
100 7.03
›
—
—
›✟
—
—
—
—
—
—
What is
Water Hammer?
Series 05
Series 150A
For Light Commercial/Residential Systems
For Residential Systems Only
Model 05H-M1
⁄4" (20mm) Hose Type
specially designed for
in-line use with
washing machines
3
3
⁄4" 05-QC
Dishwashers, clothes washers, fast closing positive shutoff
valves incorporated in the system, all contribute to creating
water shock which is not only annoying but damaging to
pipes and appliances. Watts Water Hammer Arrestors
incorporate a permanent pre-charged sealed air chamber to
absorb the shock. The sealed chamber prevents the loss of
air to the water and ensures long and trouble-free life. All
potential leak points are permanently sealed.
he noise from banging pipes is caused by shocks of
high speed water flowing in the piping system when
a fixture is suddenly closed. Sudden stoppage of the
water (a non-compressible liquid) flowing at a given pressure and velocity causes a surge or spike of pressure and
is called water hammer. When this occurs a pressure wave
travels back through the piping until it finds a point of relief.
T
Features
Features
5
⁄8" 05-C
• Economical and effective single fixture protection
against water pressure shock
• Pre-charged air chamber
• May be installed in concealed locations without access
panels
• Rechargeable
• Sealed in diaphragm
• Stainless steel chamber construction
• Factory air charged and not rechargeable
• May be installed in new or existing plumbing systems
vertically, horizontally or at any angle
5
Sizing and Placement
The fixture unit valve shown in the cold and hot water columns of Table A below are utilized in the sizing of water hammer arrestors.
Once the total number of fixture units has been calculated for the hot and cold water branch lines serving a group of fixtures, this number can
be applied to the sizing and selection Table B below to determine the appropriate size water hammer arrestor for the hot and cold branch lines.
Table B — Series 15M2 Sizing and Selection
Table A — Fixture Units Sizing Information
SIZE (DN)
WEIGHT IN FIXTURE-UNITS
TYPE OF SUPPLY
FIXTURE
Water Closet 1.66 PF
Water Closet 1.66 PF
Pedestal Urinal 1.06 PF
Stall or Wall Urinal
Stall or Wall Urinal
Lavatory
Bathtub
Shower Head
Bathroom Group
Bathroom Group
Separate Shower
Service Sink
Laundry Tubs (1-3)
Combination Fixture
CONTROL
Flush Valve
Flush Tank
Flush Valve
Flush Valve 1.06 PF
Flush Tank 1.06 PF
Faucet
Faucet
Mixing Valve
Flush Valve Closet
Flush Tank Closet
Mixing Valve
Faucet
Faucet
Faucet
PUBLIC
TOTAL C.W.
8
5
4
4
2
2
4
4
–
–
–
3
–
–
8
5
4
4
2
11⁄2
2
2
–
–
–
3
–
–
PRIVATE
H.W.
–
–
–
–
–
11⁄2
3
3
–
–
–
3
–
–
TOTAL C.W.
5
2.5
–
–
–
1
2
2
8
6
2
–
3
3
5
2.5
–
–
–
1
11⁄2
1
8
6
1
–
3
3
H.W.
–
–
–
–
–
1
11⁄2
2
3
3
2
–
3
3
CROSS FIXTURE UNITS
In.
mm
1
15
20
25
32
40
50
⁄2
3
⁄4
1
11⁄4
11⁄2
2
1-11
12-32
33-60
61-113
114-154
155-330
REF. PDI STANDARD
A
B
C
D
E
F
⁄8" 05-CXT
Pressure & Temperature
Operating Pressure: Designed especially for use in light
commercial or residential applications on lines up to 150psi
(10.6 bar) working pressure.
⁄8" 05-PEX-T
Temperature Range: 33°F to 180°F (0.5°C-82°C)
05-C For compression installation on ⁄2" CTS new or retrofit
Temperature Range: 33°F to 180°F (0.5°C - 82°C)
05-QC Arrestor offered with Quick-Connect Tee
Air Preload: 60psi (4.2 bar)
05H-M1 For inline use with washing machines
Standards
05-C-T For either 1⁄4" icemaker or 3⁄8" lav supply tube installation
Dimensions - Weight
in
05
05
05-CPVC
05-H
05H-M1
05-S
05-S
05-C
3
⁄8
1
⁄2
1
⁄2
3
⁄4
3
⁄4
1
⁄2
3
⁄4
5
⁄8
MODEL
1
05-PEX-T For either ⁄8" or ⁄2" inline PEX installation
For complete list of models, send for ES-05.
Straight Models
SIZE (DN)
Models
05-CXT For direct installation on supply stop either between stub out
and stop or between stop and supply tube
3
MODEL
Maximum Shock Pressure: 200psi (13.8 bar)
1
Certified to ASSE 1010 and listed by IAPMO.
CONNECTION TYPE
DIMENSION
mm
in.
10
15
15
20
20
15
20
16
1
NPT
NPT
CPVC
Hose
Hose
Sweat
Sweat
OD Comp.
1 ⁄4
11⁄4
11⁄8
2
33⁄16
1
1
11⁄4
MODEL
SIZE (DN)
CONNECTION TYPE
IPC-International Plumbing Code
609.10 Water Hammer. All building water supply systems in which
quick-acting valves are installed shall be provided with devices to
absorb the hammer caused by high pressures resulting from the
quick closing of these valves. These pressure-absorbing devices
shall be approved mechanical devices. Water pressure-absorbing
devices shall be installed as close as possible to quick-acting valves.
604.9 Water Hammer. The flow velocity of the water distribution
system shall be controlled to reduce the possibility of water hammer. A water hammer arrestor shall be installed where quick-closing
valves are utilized. Water hammer arrestors shall be installed in
accordance with the manufacturer's specifications. Water hammer
arrestors shall conform to ASSE 1010.
2
05-C-T
05-C-T
05-CXT
05-CXT
05-PEX-T
05-PEX-T
05-QC
05-QC
in
mm
1
8
10
10
16
10
15
15
20
⁄4
3
⁄8
3
⁄8
5
⁄8
3
⁄8
1
⁄2
1
⁄2
3
⁄4
OD Comp.
OD Comp.
OD Comp. x Reverse Comp. Nut
OD Comp. x Reverse Comp. Nut
PEX
PEX
Quick-Connect
Quick-Connect
SIZE
in.
150A
Water Hammer Arrestor Only
150A-HA Water Hammer Arrestor and Fitting
150HA
Fitting Only
1
⁄2"
⁄4"
3
⁄4"
3
CONNECTION TYPE
mm
15
20
20
NPT
Hose
Hose
WEIGHT
mm
in.
mm
lbs.
kgs.
32
32
29
50
81
25
25
32
1
133
140
118
162
170
140
124
143
0.34
0.36
0.10
0.48
0.60
0.30
0.08
0.40
0.15
0.16
0.05
0.20
0.27
0.14
0.04
0.18
5 ⁄4
51⁄2
411⁄16
63⁄8
611⁄16
51⁄2
47⁄8
55⁄8
DIMENSION
A
UPC-Uniform Plumbing Code
DESCRIPTION
B
Dimensions
NOMINAL
A
Pipe
Size
in.
mm
WEIGHT
1
15
3
⁄4
20
1
25
11⁄4
32
⁄2
B
in.
mm
in.
mm
lbs.
kgs.
23⁄4
3
213⁄16
31⁄16
21⁄4
21⁄4
35⁄8
33⁄32
70
77
72
78
58
58
93
104
413⁄16
413⁄16
413⁄16
413⁄16
411⁄16
411⁄16
73⁄8
93⁄4
122
122
122
122
119
119
187
247
0.17
0.17
0.17
0.18
0.12
0.12
0.4
0.57
0.07
0.07
0.07
0.08
0.05
0.05
0.18
0.26
3
150A-HA
B
Tee Models
2006 Plumbing Code Requirements
150A
Maximum Velocity: 10 fps (.93 mps)
05 For NPT threaded applications
A
For additional information, send for ES-15M2.
3
Models
Operating Pressure: Designed for residential/domestic
water systems on lines up to 150psi (10.6 bar) working
pressure.
B
A
LENGTH
Pipe
Up to
ft.
m
50
75
100
25
50
75
25
50
75
25
15.2
22.9
30.5
7.6
15.2
22.9
7.6
15.2
22.9
7.6
FLOW PRESSURE - PSI
psi
30
bar
2.11
150A
150A
150A
150A
150A
150A
150A
2-150A
2-150A
2-150A
psi
40
bar
2.81
›
›
›
›
›
›
›
›
—
›
psi
50
bar
3.52
›
›
2-150A
›
2-150A
›
›
›
—
›
For additional information, send for ES-150A.
4
and Number of 150A valves to install
psi
bar
psi
bar
60
4.22
70
4.92
›
›
›
›
›
›
›
›
—
›
›
2-150A
›
›
›
—
2-150A
—
—
›
psi
80
bar
5.62
›
›
›
›
›
—
›
—
—
—
psi
90
bar
6.33
2-150A
›
—
2-150A
—
—
›
—
—
—
psi bar
100 7.03
›
—
—
›✟
—
—
—
—
—
—
What is
Water Hammer?
Series 05
Series 150A
For Light Commercial/Residential Systems
For Residential Systems Only
Model 05H-M1
⁄4" (20mm) Hose Type
specially designed for
in-line use with
washing machines
3
3
⁄4" 05-QC
Dishwashers, clothes washers, fast closing positive shutoff
valves incorporated in the system, all contribute to creating
water shock which is not only annoying but damaging to
pipes and appliances. Watts Water Hammer Arrestors
incorporate a permanent pre-charged sealed air chamber to
absorb the shock. The sealed chamber prevents the loss of
air to the water and ensures long and trouble-free life. All
potential leak points are permanently sealed.
he noise from banging pipes is caused by shocks of
high speed water flowing in the piping system when
a fixture is suddenly closed. Sudden stoppage of the
water (a non-compressible liquid) flowing at a given pressure and velocity causes a surge or spike of pressure and
is called water hammer. When this occurs a pressure wave
travels back through the piping until it finds a point of relief.
T
Features
Features
5
⁄8" 05-C
• Economical and effective single fixture protection
against water pressure shock
• Pre-charged air chamber
• May be installed in concealed locations without access
panels
• Rechargeable
• Sealed in diaphragm
• Stainless steel chamber construction
• Factory air charged and not rechargeable
• May be installed in new or existing plumbing systems
vertically, horizontally or at any angle
5
Sizing and Placement
The fixture unit valve shown in the cold and hot water columns of Table A below are utilized in the sizing of water hammer arrestors.
Once the total number of fixture units has been calculated for the hot and cold water branch lines serving a group of fixtures, this number can
be applied to the sizing and selection Table B below to determine the appropriate size water hammer arrestor for the hot and cold branch lines.
Table B — Series 15M2 Sizing and Selection
Table A — Fixture Units Sizing Information
SIZE (DN)
WEIGHT IN FIXTURE-UNITS
TYPE OF SUPPLY
FIXTURE
Water Closet 1.66 PF
Water Closet 1.66 PF
Pedestal Urinal 1.06 PF
Stall or Wall Urinal
Stall or Wall Urinal
Lavatory
Bathtub
Shower Head
Bathroom Group
Bathroom Group
Separate Shower
Service Sink
Laundry Tubs (1-3)
Combination Fixture
CONTROL
Flush Valve
Flush Tank
Flush Valve
Flush Valve 1.06 PF
Flush Tank 1.06 PF
Faucet
Faucet
Mixing Valve
Flush Valve Closet
Flush Tank Closet
Mixing Valve
Faucet
Faucet
Faucet
PUBLIC
TOTAL C.W.
8
5
4
4
2
2
4
4
–
–
–
3
–
–
8
5
4
4
2
11⁄2
2
2
–
–
–
3
–
–
PRIVATE
H.W.
–
–
–
–
–
11⁄2
3
3
–
–
–
3
–
–
TOTAL C.W.
5
2.5
–
–
–
1
2
2
8
6
2
–
3
3
5
2.5
–
–
–
1
11⁄2
1
8
6
1
–
3
3
H.W.
–
–
–
–
–
1
11⁄2
2
3
3
2
–
3
3
CROSS FIXTURE UNITS
In.
mm
1
15
20
25
32
40
50
⁄2
3
⁄4
1
11⁄4
11⁄2
2
1-11
12-32
33-60
61-113
114-154
155-330
REF. PDI STANDARD
A
B
C
D
E
F
⁄8" 05-CXT
Pressure & Temperature
Operating Pressure: Designed especially for use in light
commercial or residential applications on lines up to 150psi
(10.6 bar) working pressure.
⁄8" 05-PEX-T
Temperature Range: 33°F to 180°F (0.5°C-82°C)
05-C For compression installation on ⁄2" CTS new or retrofit
Temperature Range: 33°F to 180°F (0.5°C - 82°C)
05-QC Arrestor offered with Quick-Connect Tee
Air Preload: 60psi (4.2 bar)
05H-M1 For inline use with washing machines
Standards
05-C-T For either 1⁄4" icemaker or 3⁄8" lav supply tube installation
Dimensions - Weight
in
05
05
05-CPVC
05-H
05H-M1
05-S
05-S
05-C
3
⁄8
1
⁄2
1
⁄2
3
⁄4
3
⁄4
1
⁄2
3
⁄4
5
⁄8
MODEL
1
05-PEX-T For either ⁄8" or ⁄2" inline PEX installation
For complete list of models, send for ES-05.
Straight Models
SIZE (DN)
Models
05-CXT For direct installation on supply stop either between stub out
and stop or between stop and supply tube
3
MODEL
Maximum Shock Pressure: 200psi (13.8 bar)
1
Certified to ASSE 1010 and listed by IAPMO.
CONNECTION TYPE
DIMENSION
mm
in.
10
15
15
20
20
15
20
16
1
NPT
NPT
CPVC
Hose
Hose
Sweat
Sweat
OD Comp.
1 ⁄4
11⁄4
11⁄8
2
33⁄16
1
1
11⁄4
MODEL
SIZE (DN)
CONNECTION TYPE
IPC-International Plumbing Code
609.10 Water Hammer. All building water supply systems in which
quick-acting valves are installed shall be provided with devices to
absorb the hammer caused by high pressures resulting from the
quick closing of these valves. These pressure-absorbing devices
shall be approved mechanical devices. Water pressure-absorbing
devices shall be installed as close as possible to quick-acting valves.
604.9 Water Hammer. The flow velocity of the water distribution
system shall be controlled to reduce the possibility of water hammer. A water hammer arrestor shall be installed where quick-closing
valves are utilized. Water hammer arrestors shall be installed in
accordance with the manufacturer's specifications. Water hammer
arrestors shall conform to ASSE 1010.
2
05-C-T
05-C-T
05-CXT
05-CXT
05-PEX-T
05-PEX-T
05-QC
05-QC
in
mm
1
8
10
10
16
10
15
15
20
⁄4
3
⁄8
3
⁄8
5
⁄8
3
⁄8
1
⁄2
1
⁄2
3
⁄4
OD Comp.
OD Comp.
OD Comp. x Reverse Comp. Nut
OD Comp. x Reverse Comp. Nut
PEX
PEX
Quick-Connect
Quick-Connect
SIZE
in.
150A
Water Hammer Arrestor Only
150A-HA Water Hammer Arrestor and Fitting
150HA
Fitting Only
1
⁄2"
⁄4"
3
⁄4"
3
CONNECTION TYPE
mm
15
20
20
NPT
Hose
Hose
WEIGHT
mm
in.
mm
lbs.
kgs.
32
32
29
50
81
25
25
32
1
133
140
118
162
170
140
124
143
0.34
0.36
0.10
0.48
0.60
0.30
0.08
0.40
0.15
0.16
0.05
0.20
0.27
0.14
0.04
0.18
5 ⁄4
51⁄2
411⁄16
63⁄8
611⁄16
51⁄2
47⁄8
55⁄8
DIMENSION
A
UPC-Uniform Plumbing Code
DESCRIPTION
B
Dimensions
NOMINAL
A
Pipe
Size
in.
mm
WEIGHT
1
15
3
⁄4
20
1
25
11⁄4
32
⁄2
B
in.
mm
in.
mm
lbs.
kgs.
23⁄4
3
213⁄16
31⁄16
21⁄4
21⁄4
35⁄8
33⁄32
70
77
72
78
58
58
93
104
413⁄16
413⁄16
413⁄16
413⁄16
411⁄16
411⁄16
73⁄8
93⁄4
122
122
122
122
119
119
187
247
0.17
0.17
0.17
0.18
0.12
0.12
0.4
0.57
0.07
0.07
0.07
0.08
0.05
0.05
0.18
0.26
3
150A-HA
B
Tee Models
2006 Plumbing Code Requirements
150A
Maximum Velocity: 10 fps (.93 mps)
05 For NPT threaded applications
A
For additional information, send for ES-15M2.
3
Models
Operating Pressure: Designed for residential/domestic
water systems on lines up to 150psi (10.6 bar) working
pressure.
B
A
LENGTH
Pipe
Up to
ft.
m
50
75
100
25
50
75
25
50
75
25
15.2
22.9
30.5
7.6
15.2
22.9
7.6
15.2
22.9
7.6
FLOW PRESSURE - PSI
psi
30
bar
2.11
150A
150A
150A
150A
150A
150A
150A
2-150A
2-150A
2-150A
psi
40
bar
2.81
›
›
›
›
›
›
›
›
—
›
psi
50
bar
3.52
›
›
2-150A
›
2-150A
›
›
›
—
›
For additional information, send for ES-150A.
4
and Number of 150A valves to install
psi
bar
psi
bar
60
4.22
70
4.92
›
›
›
›
›
›
›
›
—
›
›
2-150A
›
›
›
—
2-150A
—
—
›
psi
80
bar
5.62
›
›
›
›
›
—
›
—
—
—
psi
90
bar
6.33
2-150A
›
—
2-150A
—
—
›
—
—
—
psi bar
100 7.03
›
—
—
›✟
—
—
—
—
—
—
Rule 1 covers multiple fixture branch lines which do not exceed
20 feet length.
Sizing and Placement
Series 15M2
Explanation - Fixture unit sizing and selection table is used to
select the required PDI unit (water hammer arrestor).
Water
Hammer Arrestor
For Commercial/Residential Systems
Riser
Up to 20'
Rule 1
Typical Branch Line
As shown above, it has been established that the preferred location
for the water hammer arrestor is at the end of the branch line between
the last two fixtures served.
The location of the water hammer arrestor shown above applies to
branch lines that do not exceed 20 feet in length, from the start of the
horizontal branch line to the last fixture supply on this branch line.
When the branch line exceeds the 20 foot length, an additional water
hammer arrestor should be used. This practice is best defined by two
rules which have been established to cover the placement of water
hammer arrestors.
Features
• NPT solid hex brass adapter or solder end connection
for easy installation
• Approved for installation with no access panel required
• May be installed in new or existing plumbing systems with
a standard pipe tee vertically, horizontally or at any angle
• PDI Listed (PDI WH201)
• Maintenance free – unit piston is the only moving part
• Air pre-load is 60 psi (4.2 bar)
• Factory air charged and permanently sealed
15M2
Pre-charged
Air Chamber
Permanently
Sealed from
Water System
Operating Pressure: Designed to operate on all domestic and
commercial lines @150psi (10.6 bar) working pressure.
B
Materials
Bodies: Copper tubing
Pistons: Polypropylene
O-Ring: EPDM
Adapter: Brass
NPT Brass
Adapter
for Easy
Installation
Standards
Listed by IAPMO, ASSE 1010 approved, ANSI A112.261M
approved, PDI WH201 approved and certified.
A
Dimensions — Weight
DIMENSIONS
WEIGHT (lbs.)
A
Selection for Long Piping Runs
Sizing Table
The majority of sizing and selection applications will involve single and
multiple fixture branch lines. These are easily handled with the sizing
and selection table. The remainder of the applications involve individual runs of piping to a remote item of equipment. The properly sized
water hammer arrestor for such applications can be determined by
the tables below.
For Water Pressures up to 65psi
All sizing data in this section is based on flow velocities of 10 fps or
less. The certification testing was conducted with a velocity of 10 fps
to offer assurance that PDI approved units were capable of handling
shock of maximum intensity that may be encountered.
⁄2"
⁄4"
1"
1"
1"
1"
3
25'
50'
75'
100'
125'
150'
mm
in.
15M2-A
15M2-B
15M2-C
15M2-D
15M2-E
15M2-F
11⁄8
13⁄8
15⁄8
21⁄8
21⁄8
25⁄8
28.5
34.9
41.3
54.0
54.0
66.7
515⁄16
89⁄16
813⁄16
915⁄16
1211⁄16
115⁄32
150.9
218.0
223.5
252.5
322.5
283.5
0.5
0.9
1.3
2.0
2.3
2.7
0.2
0.4
0.6
0.9
1.1
1.2
15M2-AS
15M2-BS
15M2-CS
15M2-DS
15M2-ES
15M2-FS
11⁄8
11⁄8
13⁄8
21⁄8
21⁄8
21⁄8
210.0
254.0
317.5
280.0
343.0
406.5
81⁄4
10
121⁄2
11
131⁄2
16
28.5
28.5
34.9
54.0
54.0
54.0
0.44
0.54
0.92
1.63
1.98
2.32
0.2
0.2
0.4
0.7
0.9
1.1
mm
Water Hammer Arrestor
5
⁄2"
A
A
B
C
C
D
3
⁄4"
1"
11⁄4"
11⁄2"
2"
A
B
C
D
D
E
B
C
D
E
F
F
C
D
AE
F
AF
DF
D
E
F
CF
EF
FF
E
F
EF
FF
EFF
FFF
Water Hammer Arrestors
Over 65 psi and up to 85psi
LENGTH OF PIPE (ft)
NOMINAL PIPE DIAMETER - IN.
1
of Pipe
25'
50'
75'
100'
125'
150'
B
in.
NOMINAL PIPE DIAMETER - IN.
1
⁄2"
B
B
C
D
D
E
3
⁄4"
1"
11⁄4"
11⁄2"
2"
B
C
D
E
E
F
C
D
E
F
CF
CF
D
E
F
CF
DF
FF
E
F
CF
EF
FF
DFF
F
CF
FF
EFF
BFFF
FFFF
Sizing and Selection Table
Shock
SIZE
(DN)
Quick
Closure
Valve
in.
Long Run of Piping
1
Outlet
Solder
1
LENGTH OF PIPE (ft)
When long runs of piping are employed to serve a remote item of
equipment, the water hammer arrestor should be located as close as
possible to the point of quick closure. At this location, the water hammer arrestor will control the developed energy and prevent the shock
wave from surging through the piping system. A typical example of
placement is as shown.
(kgs.)
Threaded
⁄2"
3
⁄4"
1"
1"
1"
1"
Over 20'
Rule 2
Ideally, the flow pressure in branch lines serving fixtures should never
exceed 55psi. Pressure reducing valves should be installed to maintain
proper pressure. When flow pressures are 65 to 85psi the next size
water hammer arrestor should be selected. Refer to sizing table for
water pressure over 65psi.
Temperature Range: 33°F to 180°F (0.5°C to 82°C).
1
Explanation - Fixture unit sizing and selection table is used to
select the required PDI unit (water hammer arrestor). The sum of
the fixture unit rating of units X and Y shall be equal to or greater
than the demand of the branches.
15M2S
Pressure — Temperature
SIZE (DN)
Rule 2 covers multiple fixture branch lines which exceed 20 feet
in length.
A Watts Water Technologies Company
F-WHA 1050
/2"
/4"
1"
1"
1"
1"
3
MODEL
mm
Threaded
15
20
25
25
25
25
15M2-A
15M2-B
15M2-C
15M2-D
15M2-E
15M2-F
ORDER
CODE
MODEL
ORDER
CODE
CROSS
FIXTURE
UNITS
REF. PDI
STANDARD
0750150
0750151
0750152
0750153
0750154
0750155
1-11
12-32
33-60
61-113
114-154
155-330
A
B
C
D
E
F
Solder
0750140
0750141
0750142
0750143
0750144
0750145
15M2-AS
15M2-BS
15M2-CS
15M2-DS
15M2-ES
15M2-FS
USA: No. Andover, MA • Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ONT. • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
© 2010 Watts
watts.com
Rule 1 covers multiple fixture branch lines which do not exceed
20 feet length.
Sizing and Placement
Series 15M2
Explanation - Fixture unit sizing and selection table is used to
select the required PDI unit (water hammer arrestor).
Water
Hammer Arrestor
For Commercial/Residential Systems
Riser
Up to 20'
Rule 1
Typical Branch Line
As shown above, it has been established that the preferred location
for the water hammer arrestor is at the end of the branch line between
the last two fixtures served.
The location of the water hammer arrestor shown above applies to
branch lines that do not exceed 20 feet in length, from the start of the
horizontal branch line to the last fixture supply on this branch line.
When the branch line exceeds the 20 foot length, an additional water
hammer arrestor should be used. This practice is best defined by two
rules which have been established to cover the placement of water
hammer arrestors.
Features
• NPT solid hex brass adapter or solder end connection
for easy installation
• Approved for installation with no access panel required
• May be installed in new or existing plumbing systems with
a standard pipe tee vertically, horizontally or at any angle
• PDI Listed (PDI WH201)
• Maintenance free – unit piston is the only moving part
• Air pre-load is 60 psi (4.2 bar)
• Factory air charged and permanently sealed
15M2
Pre-charged
Air Chamber
Permanently
Sealed from
Water System
Operating Pressure: Designed to operate on all domestic and
commercial lines @150psi (10.6 bar) working pressure.
B
Materials
Bodies: Copper tubing
Pistons: Polypropylene
O-Ring: EPDM
Adapter: Brass
NPT Brass
Adapter
for Easy
Installation
Standards
Listed by IAPMO, ASSE 1010 approved, ANSI A112.261M
approved, PDI WH201 approved and certified.
A
Dimensions — Weight
DIMENSIONS
WEIGHT (lbs.)
A
Selection for Long Piping Runs
Sizing Table
The majority of sizing and selection applications will involve single and
multiple fixture branch lines. These are easily handled with the sizing
and selection table. The remainder of the applications involve individual runs of piping to a remote item of equipment. The properly sized
water hammer arrestor for such applications can be determined by
the tables below.
For Water Pressures up to 65psi
All sizing data in this section is based on flow velocities of 10 fps or
less. The certification testing was conducted with a velocity of 10 fps
to offer assurance that PDI approved units were capable of handling
shock of maximum intensity that may be encountered.
⁄2"
⁄4"
1"
1"
1"
1"
3
25'
50'
75'
100'
125'
150'
mm
in.
15M2-A
15M2-B
15M2-C
15M2-D
15M2-E
15M2-F
11⁄8
13⁄8
15⁄8
21⁄8
21⁄8
25⁄8
28.5
34.9
41.3
54.0
54.0
66.7
515⁄16
89⁄16
813⁄16
915⁄16
1211⁄16
115⁄32
150.9
218.0
223.5
252.5
322.5
283.5
0.5
0.9
1.3
2.0
2.3
2.7
0.2
0.4
0.6
0.9
1.1
1.2
15M2-AS
15M2-BS
15M2-CS
15M2-DS
15M2-ES
15M2-FS
11⁄8
11⁄8
13⁄8
21⁄8
21⁄8
21⁄8
210.0
254.0
317.5
280.0
343.0
406.5
81⁄4
10
121⁄2
11
131⁄2
16
28.5
28.5
34.9
54.0
54.0
54.0
0.44
0.54
0.92
1.63
1.98
2.32
0.2
0.2
0.4
0.7
0.9
1.1
mm
Water Hammer Arrestor
5
⁄2"
A
A
B
C
C
D
3
⁄4"
1"
11⁄4"
11⁄2"
2"
A
B
C
D
D
E
B
C
D
E
F
F
C
D
AE
F
AF
DF
D
E
F
CF
EF
FF
E
F
EF
FF
EFF
FFF
Water Hammer Arrestors
Over 65 psi and up to 85psi
LENGTH OF PIPE (ft)
NOMINAL PIPE DIAMETER - IN.
1
of Pipe
25'
50'
75'
100'
125'
150'
B
in.
NOMINAL PIPE DIAMETER - IN.
1
⁄2"
B
B
C
D
D
E
3
⁄4"
1"
11⁄4"
11⁄2"
2"
B
C
D
E
E
F
C
D
E
F
CF
CF
D
E
F
CF
DF
FF
E
F
CF
EF
FF
DFF
F
CF
FF
EFF
BFFF
FFFF
Sizing and Selection Table
Shock
SIZE
(DN)
Quick
Closure
Valve
in.
Long Run of Piping
1
Outlet
Solder
1
LENGTH OF PIPE (ft)
When long runs of piping are employed to serve a remote item of
equipment, the water hammer arrestor should be located as close as
possible to the point of quick closure. At this location, the water hammer arrestor will control the developed energy and prevent the shock
wave from surging through the piping system. A typical example of
placement is as shown.
(kgs.)
Threaded
⁄2"
3
⁄4"
1"
1"
1"
1"
Over 20'
Rule 2
Ideally, the flow pressure in branch lines serving fixtures should never
exceed 55psi. Pressure reducing valves should be installed to maintain
proper pressure. When flow pressures are 65 to 85psi the next size
water hammer arrestor should be selected. Refer to sizing table for
water pressure over 65psi.
Temperature Range: 33°F to 180°F (0.5°C to 82°C).
1
Explanation - Fixture unit sizing and selection table is used to
select the required PDI unit (water hammer arrestor). The sum of
the fixture unit rating of units X and Y shall be equal to or greater
than the demand of the branches.
15M2S
Pressure — Temperature
SIZE (DN)
Rule 2 covers multiple fixture branch lines which exceed 20 feet
in length.
A Watts Water Technologies Company
F-WHA 1050
/2"
/4"
1"
1"
1"
1"
3
MODEL
mm
Threaded
15
20
25
25
25
25
15M2-A
15M2-B
15M2-C
15M2-D
15M2-E
15M2-F
ORDER
CODE
MODEL
ORDER
CODE
CROSS
FIXTURE
UNITS
REF. PDI
STANDARD
0750150
0750151
0750152
0750153
0750154
0750155
1-11
12-32
33-60
61-113
114-154
155-330
A
B
C
D
E
F
Solder
0750140
0750141
0750142
0750143
0750144
0750145
15M2-AS
15M2-BS
15M2-CS
15M2-DS
15M2-ES
15M2-FS
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