143 YEARS OF TOP QUALITY BOILER MANUFACTURING!
IV. A. INSTALLATION RECOMMENDATIONS


The following are general recommendations for installing a Johnston Packaged Boiler. Project Plans and State and Local Code requirements must also be followed. These legal requirements take precedence over information contained in this manual..

The boiler should be set on a raised concrete pad. The boiler should be level and its base frame should be grouted to the raised concrete pad. A 36" aisle space at the sides and to the rear of the boiler is recommended. Adequate space for boiler tube removal and replacement should be provided to the front of the boiler. Refer to the specified boiler size requirements, in this regard.

The flue gas outlet connection on a Johnston Boiler is only intended to support a limited boiler stack, or breaching. The minimum stack diameter for the size boiler should be adhered to. Where a breaching is used, a round breaching is preferred. If a rectangular breaching is used, stiffeners should be provided in large flat areas of the breaching, not only for strength, but to minimize the possible vibration and noise that may be experienced from using a rectangular breaching. If two (2) or more boilers are installed in a common breaching, the breaching size should get progressively larger from the end boiler (farthest from the stack), so to accommodate the additional volume of flue gas from one boiler to the next.

A rain cap is recommended on a stack connected directly to the boiler. The rain cap should be mounted no less than the diameter of the stack above the end of the stack.

- Warning -
All blowoff and blowdown valves, including any Johnston supplied piping, whether water column, surface/continuous or bottom, should be piped, or further piped, properly and to a safe point of discharge. If they are piped into a blowdown separator, the blowdown line should be properly valved, so the boiler is capable of being completely drained.

- Warning -
Very often boiler safety relief valves are removed from the boiler, following factory testing of the boiler, just prior to shipment. These safety relief valves must be reinstalled on the boiler, using on a safety relief valve wrench. Using a conventional pipe wrench often damages the safety relief valves. This type of damage is not covered under the boiler warranty. All safety relief valves should be piped to a safe point of discharge. Safety relief valve discharge piping should have an internal area equal to or greater than the internal area of the valve outlet. The discharge piping should be arranged and installed so that no strain is imposed on the safety relief valve. The discharge piping should be braced or supported to prevent any strain on the safety relief valve during operation.

Boiler feedwater and fuel piping and electrical supply lines should be properly installed to the boiler. It is recommended that feedwater and fuel supply lines be properly valved, so the supply lines to the boiler can be shutoff when it is not in use or when preventative maintenance or repairs to the boiler are being made. A Adirt trap@ should be installed in the gas supply line, just prior to entering the main gas train of the boiler. A means to disconnect and lockout the power supply to the boiler control panel should also be provided. Installation of boiler feedwater, fuel and electrical power supply piping and lines should be checked, so as not to interfere with operation of any component part of the boiler, or interfere with the ability to perform preventative maintenance or make a repair. Special attention should be given to making sure that no piping or lines interfere with the boiler smokebox doors.

An adequate, proper and consistent supply of fresh air must be supplied into the boiler room for burner combustion air. A rule of thumb is to provide four to six square inches, of open, unrestricted area, for every boiler horsepower. Example: 75 Horsepower Boiler X 5 Square Inches - 375 Square Inches of open, unrestricted area.

The illustrations shown on the following pages are meant to aid in the proper installation of a Johnston Packaged Boiler.

NOTE: Only qualified and experienced personnel should install boilers and boiler room equipment.