Dry Barrel Fire Hydrant

Description

Dry barrel fire hydrants are primarily designed for areas with frost,where the water main is located below the ground frost zone.They are designed for high performance,easy repair and minimun end user costs for labour and inventory.

Drawing

Features

Norminal pressure:250psi

Design standard:AWWA C502

Inlet flange size:6''(DN150),Main valve size:133.4 mm / 5-1/4''

One pumper nozzle: 4.5-4NH thread. Two hose nozzles, 2.5-7.5NH threads

Other kinds of threads are available

Mechnical connector: AWWA/ANSI C153 / A21.536

Flange connector: ASME B16.5 CLASS 150/DIN 2501 PN16

Painting details: red Polyurethane paint & Bitumen Black or painting upon request

Note:Each hydrant is supplied with a hydrant wrench

Installation

Hydrants should be handled with care to avoid damage. It is recommended to keep hydrants closed unitl use.

If the hydrant is not to be used straight away then it is recommended to coat threads and other machined parts with anti-rust oil and the hydrant should be stored in a dry and ventlated area. For long-term storage,the hydrant should be checked regularly.

Before installation of hydrants,the connection should be free from dirt or other matter.

The positioning of the hydrant should be in accordance with local requirements.

Ideally the pumper should face the street and all connections should be away from any obstruction to connecting hoses.

The inlet elbow should be placed on a solid surface and if possible brace the side opposite the incoming flow to reduce reaction stresses 

The underground parts of the hydrant should be surrounded with coarse gravel for support and drainage.

After the hydrant has been installed and tested,it is recommended to fullyflush the hydrant before closing for service.Before replacing the nozzle caps, it is recommended to check for correct drainage of the hydrant on closing of the valve.This can be achieved by placing a hand over the nozzle opening, a suction should be felt.

Operation

Unscrew the nozzle caps and connect hoses

Open the hydrant using the hydrant key (included)to the fully open position by turning the operation nut in an anti-clockwise direction.Do not force the hydrant to open further past the full open position.Note that the hydrant valve is not intended to control the flow.It should be used in either the fully open or fully closed position.

To control flow,a pressure/flow control valve should be fitted to the nozzle outlets on the hydrant

To close,turn the operation nut into a clockwise direction again,do not over tighten.

Maintenance

Carry out a visual inspection for signs of significant corrosion which may impair performance

Where possible,carry out leakage tests by opening one of the nozzle caps slightly and then open the hydrant valve.

Once the air has escaped,tighten the hose cap and check for leaks.

Close hydrant and remove one nozzle cap so that the drainage can be checked

Flush the hydrant

Clean and lubricate all nozzle threads

Clean the exterior of the hydrant and repaint if required.

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