Boiler Blog | Nationwide Boiler Inc.

Nationwide Boiler news and events, industry updates, technical resources and more. You hear it first on The Nationwide Boiler Blog!

New 110,000 lb/hr Superheat Boiler Provides Increased Steam Capacity

With short summers and weather as unpredictable as it is charming, much of Newfoundland and Labrador relies on NARL Refining’s ability to provide warmth and clean fuel. We were able to assist with the refinery’s needs by providing them with one of our new in-stock 110,000 lb/hr trailer-mounted superheat boilers. The 750 psig design watertube boiler was manufactured by Babcock & Wilcox, who recommended Nationwide Boiler for the job per our stock boiler program.

To learn more about the boiler sale and how we were able to accommodate the customer’s need for an immediately available unit, read our latest case study. (PDF will download in a new window.)
  1348 Hits
  0 Comment
1348 Hits
0 Comment

Protect Your Boiler From Freezing Conditions!

We are well into the winter season, which calls for a quick reminder on freeze protection for any boiler equipment installed outdoors, whether it is a temporary rental boiler or your facility equipment. Taking the proper preventative measures will avoid operational difficulties and major damage to your system. During freezing weather conditions, Nationwide Boiler recommends the following:

1. Enclose both the front and rear of the boiler area and use an external heat source to minimize freezing conditions.

2. Install heat tracing with insulation to protect exposed stagnant water lines.

3. Utilize an appropriate heat tracing method (electric or steam tracing) to all of your main lines and piping components. This includes the following lines, which should be heat traced regardless of whether the boiler is in operation or not (in freezing conditions):

a. Sensing lines (steam drum to CRM, high steam, and steam gauge)
b. Auxiliary low-water cut-off
c. Water column
d. Level control blowdown
e. Main and continuous blowdown (depending on length of piping runs)

4. In addition to heat tracing on stagnant sensing lines, drain the lines and fill them with a 50/50 (water/glycol) solution, making sure to re-connect the line.

5. When an extended boiler down time is expected, completely drain the boiler and stagnant water lines.

The above are recommendations, however, be sure to use sound engineering judgement calls when there are concerns of possible freeze damage to the equipment. And remember, with most rental companies, any freeze damage that requires repairs or replacement of boiler components will be the responsibility of the customer, so it is imperative that you take the correct steps to freeze protect your temporary equipment.

For further details on our freeze protection recommendations, feel free to give us a call at 1-800-227-1966.

  1197 Hits
  0 Comment
1197 Hits
0 Comment

Non-Return Valves: What, Why and How

You may not know this, but all Nationwide Boiler rental boiler systems come standard with a non-return valve. These valves are vital to protect the boiler and other plant equipment and are required by the ASME. Let’s review the basics.

What is a non-return valve?
The main function of a non-return valve (NRV), otherwise known as stop or check valve, is to allow steam flow in one direction, and automatically prevent backflow. In other words, they prevent steam from flowing back to the main header of the boiler, or back to a boiler that has failed or is off-line.

An NRV can also be used to isolate a boiler during blowdown and shutdown, and to assist in returning a boiler to operation after any planned or unplanned maintenance.

Why are they needed?
The non-return valve is really just another safety device. Although the NRV should not be relied upon for primary shut-off, it does restrict the flow of steam back from the header into the boiler, which could be disastrous.

Per ASME standards, one NRV is required for one-boiler, high pressure applications (above 15 psig). For high-pressure applications involving multiple steam boilers with manholes that are connected to a common steam main, the steam connection from each boiler must be fitted with two stop valves. The first valve must be automatic and the second should be outside-screw-and-yoke (OS&Y).

How do they prevent backflow?
Non-return valves are flow sensitive, and rely on the steam flow to open and close. The internal disc opens and allows the flow of steam through the valve. The disc will begin to close as forward steam flow decreases or is reversed, depending on the design.

As you can see, non-return valves are critical for any steam boiler system, temporary or permanent. Be sure to check with your temporary equipment supplier to ensure that they include an NRV with their boiler rental package.
Continue reading
  15630 Hits
  3 Comments
Recent Comments
Guest — Tarun bag
Dismantleing process of the valve.
Friday, 11 January 2019 09:44
Guest — Tarun ag
Dismantleing process of the valve?
Friday, 11 January 2019 09:45
Guest — Joe Haber..
How often should a High Pressure NRV be rebuilt or replaced?
Thursday, 21 March 2019 12:12
15630 Hits
3 Comments

Refresher on Freeze Protection Guidelines for Boilers

Once winter arrives it is a good time to remind our customers about how to properly prepare for freezing temperatures.  This not only applies to when a boiler is in operation, but also when a boiler is down or in transport.  The guidelines below will help get you started, but contact Nationwide Boiler if you have any further questions: 1-800-227-1967.

Freeze Protection Guidelines

Freezing conditions pose a huge risk to boiler equipment if it is not properly protected from the harsh elements. In order to ensure that your unit continues to operate while facing freezing conditions, Nationwide Boiler recommends the following:

  1. Enclose both the front and rear of the boiler area and use an external heat source to minimize freezing conditions.

  2. Install heat tracing with insulation to protect exposed stagnant water lines.

  3. Utilize an appropriate heat tracing method (electric or steam tracing) to all of your main lines and piping components.
      This includes the following lines which should be heat traced regardless if the boiler is in operation or not
      (in freezing conditions): sensing lines (steam drum to CMR, high steam and steam gauge), auxiliary
      low-water-cut-off, water column and level control blowdown. Depending on the length of piping runs,
      the main and continuous blowdown should also be heat traced.

  4. In addition to heat tracing on stagnant sensing lines, drain the lines and fill them with a 50/50 (water/glycol) solution,
      making sure to re-connect the line.

  5. When an extended boiler down time is expected, completely drain the boiler and stagnant water lines.

    • Standard Enclosure

NOTE: The above lines are considered stagnant lines and should be heat traced
regardless if the boiler is in operation or not (freezing conditions).

Nationwide has also done the following in addition to heat tracing on the stagnant sensing lines: 
Drain line, fill with 50/50 (water/glycol) solution, re-connect line. Depending on the length of piping runs, the main and continuous blowdown should also be heat traced. For extended boiler down time, drain boiler and stagnant water lines completely.

    • The above are recommendations; however, use sound engineering judgment calls when there are concerns of possible freeze damage to the equipment. 

  4068 Hits
  0 Comment
4068 Hits
0 Comment