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SAFETY DEVICES

Main Features

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Proven safe design

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High flow capacity

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Compact

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Reverse acting, non-fragmenting disc

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2X 1/8 NPT gauge ports

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Helium leak tested

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Non-standard pressure settings available on request

The function of a Rupture Disc is to protect against accidental over-

pressure of a pressure vessel due to system malfunction or fire. A

Rupture Disc is generally used in combination with a Henry

Technologies’Pressure Relief Valve.

RUPTURE DISCS

Applications

A Rupture Disc protects against any leakage or weeping of refrigerant

through a relief valve. A rupture disc can also be used in combination with a

pressure gauge and/or pressure switch to detect if a relief valve has

discharged.

Henry Technologies’ Rupture Discs are designed to operate with gases and

should not be used to prevent liquid over-pressure.

It is recommended that all high side Rupture Discs should be replaced at

least every 2 years. All low side discs should be replaced at least every 5

years. These intervals may have to be reduced if other regulations apply.

The 55 Series brass Rupture Discs are suitable for use with HCFC and HFC

refrigerants and their associated oils, as well as other industrial fluids non-

corrosive to brass, silver and nickel.

The 56 Series stainless steel Rupture Discs are suitable for use with

Ammonia, HCFC and HFC refrigerants and their associated oils, as well as

other industrial fluids non-corrosive to steel, silver and nickel.

How it works

A foil disc is clamped in a holder. The disc is designed to burst at a pre-

determined pressure - the set pressure. A reverse acting disc is used. This

means that the disc is domed against the direction of the fluid pressure and

designed to buckle due to compression forces, prior to bursting. Advantages

of a reverse acting disc include being less sensitive to temperature, high

operating pressures and improved fatigue life. Each disc is manufactured

with a precision score mark. This score mark in combination with the

buckling action causes the disc to burst. At burst, the disc is designed to

hinge resulting in a large available flow area. The disc is designed to be non-

fragmenting after rupturing.

Technical Specifications

Allowable operating temperature = -40°F to +225°F (

Set pressure range (Brass) = 150 to 675 PSI (10.3 Bar to 46.5 Bar)

Set pressure range (Steel) = 150 to 450 PSI (10.3 Bar to 31.0 Bar)

-40°C to +107°C)

Henry Technologies’ Rupture Discs are CE marked in accordance with PED.

Additionally, all Rupture Discs are tested, certified and “UD” stamped to

ASME Section VIII Div I.

Materials of Construction

For 55 and 56 series, the main bodies are made from brass and stainless

steel respectively. For both series, the foil disc is made from either silver or

nickel depending on pressure setting.

Installation - Notes

1. Connect the Rupture Disc either directly to the pressure vessel or to a

three-way valve above the liquid refrigerant level in the vapor space.

2. The Rupture Disc is comprised of a two-piece body design. To avoid

damage during assembly or removal, the product Installation Instructions

must be followed.

3. The pipework must not impose loads on the rupture disc. Loads can

occur due to misalignment, thermal expansion, discharge gas thrust, etc.

UD

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