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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 hrough 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.

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At Nationwide Boiler, we have designed and packaged our entire inventory of boilers and steam plants so they can be delivered to customers by any practical means. We call it our STAR delivery service: by Sea, Truck, Air or Rail. Our STAR delivery options provide customers with the convenience and assurance that equipment will be delivered by any practical way possible. 

Most of our inventory can be shipped by truck throughout North America from one of our many storage locations throughout the US. This saves time versus the alternative rail shipment, and can be very convenient for emergency rentals. Our trailer-mounted boilers (up to 125,000 lb/hr) and mobile boiler rooms (up to 1,000 hp) are both built on dedicated highway-legal trailers and are easily transported by truck. Skid-mounted boilers are shop-assembled package boilers and depending on the size of the boiler, units can be transported on a flat-bed or by rail. A crane is required for on- and off-loading of skid-mounted boilers. 

If the jobsite is not accessible exclusively by road, Nationwide Boiler can provide alternate delivery options. Our equipment has traveled on a container ship over the Pacific Ocean and has been loaded onto a plane for quick delivery to jobsites across the country. Nationwide Boiler has supplied equipment by sea, truck, air, and rail to 6 out of the 7 continents in the world.

In addition, Nationwide Boiler has a five point program for delivery success, which means that you can depend on us to deliver quality equipment and cost effective solutions, anywhere in the world! 

1.Our experienced project manager will help prepare the quickest and most convenient delivery to meet your unique requirements.

2.Prior to shipment, all of Nationwide Boiler’s equipment is carefully prepared, packaged, and documented, so it is ready when it arrives on site.

3.We have had years of worldwide delivery success due to our long-standing quality and reliable logistical partners. 

4.We provide proper drawings and documentation to support a successful installation.

5.Nationwide Boiler has 24/7 customer support, providing customers with peace of mind knowing that we are here to help, anytime and when you need it most. 

 

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By Sea ...

A 200,000 lb/hr boiler being loaded on a container ship for trans-Pacific deliery.

By Truck ...

A 70,000 lb/hr trailer-mounted boiler being shipped by road.

 

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By Air ...

A 70,000 lb/hr trailer-mounted boiler being loaded onto an Antonov, AN-124 aircraft for a delivery to the Middle East.

By Rail ...

An 180,000 lb/hr skid-mounted boiler ready for shipment by rail.

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Check out our latest article in the August issue of Process Heating Magazine, written by Nationwide Boiler Sales Engineer Brett Barnes! 

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In our latest video, Nationwide Boiler's Jim Lieskovan offers an inside view of one of our fully enclosed, 350 hp mobile boiler rooms. Jim also points out the primary equipment, how the unit is assembled, and how it is piped to offer ease of installation at the customer's site.

The mobile boiler room was hooked up and test fired during the video at Nationwide Boiler's shop in Fremont, CA. From assembly to turnaround and test firing each unit, we do our best to make sure our equipment is in pristine condition prior to any rental or sale.

Check out this informative video for a tour of our mobile boiler rooms, and like it on our YouTube page today!

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