Explosion Proof Jet Pump Motors

Explosion Proof Jet Pump Motors

If you're using a pump in a place where there are hazardous gases or chemicals, you should consider using an explosion proof jet pump motor to protect against accidents. This tutorial will help you choose the right explosion proof motor for your application.

An explosion proof jet pump motor will often be classified as Class 1, Division 2. This means that there are ignitable amounts of flammable gases, vapors, or liquids that are not normally present in an explosive concentration, but may exist because of a leak. Some examples of Class 1 location would be a petroleum refinery, a gasoline storage facility, and a gas plant. If a motor fails in a class 1, division 2 area, it can cause a fire. Explosion proof jet pump motors are constructed to both contain a fire if it occurs within the motor, and prevent the ignition of explosive gases or vapors to the surrounding environment.

Explosion Proof Jet Pump Motor

How to select an Explosion Proof Jet Pump Motor

Nameplate

Find the nameplate on your explosion proof jet pump motor. This will tell you the frame size (FR), rotations per minute (RPM), voltage (VOLTS), enclosure (ENCL), frequency (Hz), horsepower (HP). service factor (SF or FS), and phase (PH). These specifications must all be matched to make sure that you are purchasing the correct pump motor for you.

Frame Size

The most important thing to know when choosing your new motor is the frame size.

The frame size of your old motor can be found on the nameplate; you must be absolutely sure to choose a replacement motor with the frame size of your old motor. The frame size of the motor is indicated on the nameplate as a series of numbers and letters. When matching the frame size of the old motor to the new motor all the numbers and letters must match. This includes all numbers and letters, as there are numerous suffixes that will appear on the frame size, which can indicate both the mount of the motor and the style of the motor's shaft. Explosion proof jet pump motors will end with either J, or T.

J is used for jet pump motors that have a C-face mounts on the shaft end of the motor and a threaded, stainless steel shaft. T indicates that the motor is of the 1964 and newer "T" frame.

Frame size is meant to indicate the physical size of the motor, not the electrical characteristics such as horsepower or voltage. In general, though, the horsepower will increase with larger frame sizes, since larger motors are usually more powerful. There are many motors of the same horsepower built in different frame sizes.

The dimensions of the motor flange face can also help indicate the frame size.

The bolt circle diameter, also known as the AJ dimension in NEMA standards, is the distance between the bolt holes on the face of the motor. The bolts holes will be less than 4 inches apart for a 48 frame, and more than 4 inches apart on a 56 frame. The bolt circle diameter can be as large as 14 inches.

You can also find the frame size by measuring the rabbet diameter or flange step, also known as the AK dimension. A rabbet is a groove cut into the edge of the flange for locating purposes. Like the bolt circle diameter, the rabbet diameter is the distance between the two rabbets on either end of the frame. The rabbet diameter can range be 3 inches, all the way up to 16 inches.

The shaft size of the motor, or the U dimension, is another important piece of information you might need to know before replacing your explosion proof jet pump motor. Larger shafts will generally go with larger frame sizes, though this is sometimes not the case. The U dimension can range from ⅜ inches to 3⅜ inches.

Single or Three Phase Power

Your explosion proof jet pump motor will be operate on single phase or three phase power. It is recommended that the original and replacement motors be the same phase. Your motor's nameplate will tell you what phase your motor is running on.

If you are unable to find the information that you need on the nameplate, then you may be able to determine the phase by the environment in which your motor is being used. Single phase will usually be found in a personal pool or spa that is privately owned. Three phase is used in commercial businesses or places that run heavy equipment which would not be found in a residence.


Enclosure

Explosion proof jet pump motors can either be called explosion-proof fan-cooled (XPFC) or totally enclosed explosion-proof (TEXP), but these are the same thing. They both come with an internal fan to prevent the motor from overheating and, in turn, exploding.

Explosion proof enclosures are bulkier and heavier than their non-explosion counterparts, and are designed to resist corrosion and overheating. They are manufactured to be flametight, which requires their joints and flanges be constructed with narrow tolerances so hot gases from an internal explosion will cool to the point that when they are released they are too cool to ignite an explosion. Explosion proof motors will either be rolled or stainless steel, which will give them a smooth body, or cast iron, which will give them a rough appearance. Cast iron motors will have fins that allow the motor to cool down more easily.

Rolled Steel Explosion Proof Jet Pump Motor

Rolled steel motor

Cast Iron Explosion Proof Jet Pump Motor

Cast iron motor


Horsepower

The service factor is the overload capacity built into a motor. When determining the service factor horsepower, it will mean the maximum horsepower your motor can handle, above the rated horsepower found on the nameplate, without overheating. The industry standard service factor is 1.0 for totally-enclosed motors, but the service factors can be higher.

To determine the service factor horsepower, multiply the total horsepower by the service factor, both of which can be found on the nameplate of the motor. Do this for both the original and replacement motor; the service factor horsepower of the new motor must be equal to or greater than that of the original.

It is highly recommended that your new motor have the same horsepower as the one you are replacing to avoid overheating and other damage to your pump. TEMCo's explosion proof jet pump motors range from 0.33 HP to 5 HP.

Voltage, RPM, Frequency

Most replacement motors will have dual voltage. For example, some of the explosion proof jet pump motors that TEMCo offers are 230/460V. If the voltage of your old motor was 460V, then you should not have a problem. If the voltage was 230V, you will need to connect the new motor for the lower voltage. The motor's nameplate will guide you on how to set up the new motor for the correct voltage if necessary.

The RPM of the motor will correlate with the frequency of the motor, which, in the case of an explosion proof jet pump motor, will most often 60 Hz. The shaft of a the explosion proof jet pump motor's that operates on 60 Hz will rotate at 3600 RPM.

Rotation

The rotation of your motor will be:

• Clockwise (CW)
• Counter-clockwise (CCW)
• Reversible (RS), meaning it is able to go CW or CCW. This is usually standard with three phase motors.

The direction of rotation will be found on the nameplate. It can also be determined by viewing the shaft end of the motor, though this will not always work, as sometimes there might be a different method for finding out the shaft rotation. If this is the case, the manufacturer will usually make a note of this.

Using a motor that rotates in the wrong direction can damage your pump.


Product Selection

Click on the part numbers for more detailed information (pricing, stock & availability, data sheets, dimensions, wiring diagrams, specifications, etc.)

Single Phase, XPFC, Face Mount

Baldor Explosion Proof Jet Pump Motor Manufacturer: Baldor
Part Number HP RPM Frame Size Enclosure Mounting Phase Voltage Frequency
(Hz)
Rotation
JL5003A 0.5 3600 56J XPFC Face Single 115/230 60 Reversible
JL5006A 0.75 3600 56J XPFC Face Single 115/230 60 Reversible
JL5009A 1 3600 56J XPFC Face Single 115/230 60 Reversible
JL5030 1.5 3600 56J XPFC Face Single 115/230 60 Reversible
JL5031 2 3600 56J XPFC Face Single 115/230 60 Reversible

Three Phase, XPFC, Face Mount

Baldor Explosion Proof Jet Pump Motor

Manufacturer: Baldor

Part Number HP RPM Frame Size Enclosure Mounting Phase Voltage Frequency
(Hz)
Rotation
EJM7018 1.5 3600 56J XPFC Face Three 208-230/460 60 Reversible
EJM7071 2 3600 56J XPFC Face Three 208-230/460 60 Reversible