How do you determine the correct exhaust rain cap size to order?
Standard rain caps for exhaust system protection. The precision-balanced vane, welded lid and a lubricated metal bushing are combined into one assembly for durability.The size of the rain cap is determined by the outside diameter of the exhaust stack. Simply apply a tape measure, ruler or caliper to the opening of the exhaust stack and measure the width of the pipe at its furthest points. Make sure to measure the outside of the exhaust pipe, not the inside. The size is usually from 1″ to 8.0″
How do you select the material or finish of the rain cap?
There are several deciding factors on the type of rain cap finish you should select.
Durability: Will the rain cap be exposed to a corrosive environment such as a chemical plant? Or be see operation on a continuous basis such as a primary gen set?Consider a stainless steel rain cap as its base construction of 304 or 316 stainless steel can withstand a large degree of chemicals and operating conditions.
Price: If you're looking for the most economical type of rain flapper, choose the painted rain caps. The base material is carbon steel and paint is relatively inexpensive.
Exhaust temperatures: Natural gas engines can have exhaust temperatures exceeding 1200 degrees Fahrenheit. In these applications, consider using a stainless steel rain cap made of 304 or 316. Aluminum rain caps can also be used on higher temperature exhaust systems of 1000 degrees Fahrenheit intermittent. Carbon steel, painted rain caps can operate at exhaust temperature up to 800 degrees Fahrenheit intermittently. The paint on these exhaust flappers are designed for higher operating temperatures. The chrome plating on the chrome rain caps can burn off at higher exhaust temperatures (i.e. above 500 degree Fahrenheit).
Physical properties: Have an application that requires light weight material? Or need a rain cap that has a short counter weight dimension? Aluminum rain caps are lighter weight than their steel counterparts. And because of the lighter weight, the amount of material required for counter balance the lid is also smaller, leading to a shorter overall foot print.
Aesthetics: Rain cap going onto a show tractor? Go with a high luster finish such as chrome. A stainless steel rain cap can also be eye pleasing, but doesn't have the high luster finish of a chrome rain cap.
Prevent dirt, dust, rain, and other debris from falling into exposed stack pipes and prevent damaging your power genset with our rain caps for exhaust pipes with options rated for temperatures up to 800°We manufacture protective exhaust rain cap coverings in a variety of dimensions and materials.
YuedingExhaust.com Development Group specializes in automotive exhaust system R&D, with a core engineering team experienced in aftermarket exhaust pipe design and manufacturing. Our R&D department holds multiple patents for exhaust structure and performance optimization, developed through practical collaborations with automotive workshops worldwide. Custom exhaust solutions are available via our contact portal for tailored specifications.
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