99-903P (Fisher) First Stage LP Gas Regulator | 44.275M Million BTU | 10–65 PSI | 2 Inch FNPT

Fisher 99-903P Commercial / Industrial First Stage LP Gas Regulator

The Fisher 99-903P is a high-capacity, pilot-operated LP gas pressure regulator designed for commercial and industrial propane applications requiring precise pressure control and dependable performance under varying inlet pressures and flow demands.

Part of the Fisher Type 99 Series, this regulator delivers a rated propane capacity of 44,275,000 BTU per hour and features 2-inch FNPT inlet and outlet connections for integration into large commercial and industrial gas distribution systems.

The regulator is factory-set at 30 PSI and offers an adjustable outlet pressure range of 10–65 PSI, providing flexibility for high-pressure propane distribution and equipment supply applications.

Featuring a pilot-operated design with a Type 61 pilot, the Fisher 99-903P provides accurate downstream pressure regulation, excellent low-flow control, and tight shutoff. Its durable cast iron construction makes it suitable for demanding commercial and industrial service.

Key Features

• High-Capacity Performance: Rated for up to 44.275 million BTU/hr of propane flow under specified conditions.
• First-Stage Pressure Regulation: Designed for high-pressure propane distribution and pressure reduction applications.
• Adjustable Outlet Pressure: 10–65 PSI, with a 30 PSI factory setting.
• Large Pipe Connections: 2-inch female NPT inlet and outlet connections.
• Pilot-Operated Design: Provides accurate pressure regulation under changing inlet pressure and flow conditions.
• High Inlet Pressure Capability: Maximum operating inlet pressure of 250 PSIG for this configuration.
• Excellent Low-Flow Control: Maintains stable regulation across varying gas demands.
• Tight Shutoff: Designed to minimize downstream pressure buildup during low-flow or no-flow conditions.
• No Atmospheric Bleed: Pilot system operates without continuous atmospheric gas bleed.
• Durable Construction: Cast iron regulator body with a protective gray finish.
• Serviceable Design: Pilot and internal components can be serviced or configured for applicable operating requirements.

Technical Specifications

Typical Applications

The Fisher 99-903P is suitable for properly engineered high-capacity commercial and industrial propane systems, including:

• Commercial and industrial LP gas distribution
• First-stage propane pressure reduction
• Industrial heating and process equipment
• Large commercial boiler and burner systems
• Agricultural and greenhouse heating installations
• Manufacturing and processing facilities
• High-demand multi-appliance propane systems
• Industrial gas pressure control systems

Installation and Application Notes

The Fisher 99-903P is designed for high-pressure LP gas regulation and may be used in first-stage, intermediate-stage, or other appropriately engineered pressure-reduction applications.

Capacity Note: The published capacity of 44,275,000 BTU/hr is based on an inlet pressure 20 PSI above the outlet pressure setting and 20% pressure droop. Actual regulator capacity depends on inlet pressure, outlet pressure, gas characteristics, and system operating conditions.

Overpressure Protection: This regulator does not incorporate an internal relief valve. Appropriate external overpressure protection or pressure-limiting devices must be provided as required by the application and applicable codes.

Important: The regulator's 10–65 PSI outlet pressure range is intended for high-pressure gas distribution. It is not a direct replacement for low-pressure appliance regulators operating at inches of water column.

Regulator sizing, selection, installation, adjustment, and servicing should be performed by qualified LP gas professionals in accordance with Fisher installation instructions, NFPA 58, and applicable local regulations.