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Wilkins WK1250-B 3/4 in. Water Hammer Arrestor

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Product Code: WK1250-B

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Description

Wilkins 1250-B 3/4 inch Water Hammer Arrestor

	Specifications Instructions Sizing
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WILKINS WK1250-B 3/4 INCH WATER HAMMER ARRESTOR:

Reduces pipe banging caused by water hammer. All copper and brass external construction. Air chamber is permanently sealed. Designed to protect residential, commercial and industrial water lines during pressure surges following quick valve closure. This excessive pressure surge is absorbed by the pre-charged cushion of air permanently sealed within the water hammer arrester. The water hammer arrester may be installed within a stud bay without the need for an access panel.

Features & Benefits

Temperature range: 33° F to 180° F
End connections: Threaded ANSI/ASME B1.20.1

Materials

Body: Copper Tube (seamless, Type "L")
Tailpiece: Brass, ASTM B 16
Piston: Acetal (NSF Listed), Polycarbonate or Brass
O-rings: Buna nitrile or EPDM (FDA approved)
Solder: Lead Free

Specifications

The Water Hammer Arrester shall consist of a copper body with a brass hexagonal male pipe threaded inlet, an acetal, polycarbonate or brass piston with Buna Nitrile or EPDM o-rings and lead free solder. The device shall be pre-charged and sealed at the factory. The Water Hammer Arrester shall be a WILKINS Model 1250.

Pressure

Maximum transient pressure surge, with arrester properly sized and placed in the water supply system, will not rise above 150 psi following quick valve closure. Maximum static pressure: 150 psi. For best performance, static line pressure should not exceed 85 psi; contact the factory for proper sizing if static pressure is greater.

Standards Compliance

ASSE® Listed 1010
ANSI A112.26.1

Wilkins 1250 Water Hammer Arrestor Dimensions and Weights

Wilkins 1250 Water Hammer Arrestor Sizing and Placing Chart

MULTI-FIXTURE BRANCH LINES

Rule 1 - Branch lines of 20 feet or less.
Water Hammer Arrester should be placed at the end of the branch line between the last two fixtures served, as shown at right. Select required model using fixture unit sizing.

Rule 2 - Branch lines exceeding 20 feet.
An additional Water Hammer Arrester should be placed as shown at right. Select required models using fixture unit sizing. The sum of the fixture unit ratings of units X and Y shall be equal to or greater than the demand of the branches.

Wilkins 1250 Water Hammer Arrestor Figure 2

LONG RUNS OF PIPING TO REMOTE EQUIPMENT
When long runs of piping are employed to serve a remote item of equipment, the Water Hammer Arrester should be located as close as possible to the point of quick closure (see Fig. 4). The size and quantity of Water Hammer Arrester to be installed in branch lines is shown in Table III. Ideally, the flow pressure in branch lines serving fixtures should never exceed 55 PSIG. Pressure reducing valves should be installed to maintain proper pressure. When, however, flow pressures of 65 to 85 PSIG are used, the next larger size Water Hammer Arrester should be selected (see Table III).