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In one embodiment, a system includes a sight tube configured to optically communicate with an interior of a rotary machine via insertion within an inspection port. The sight tube includes a window and multiple openings configured to direct purge air across the window. The system also includes a curt

In one embodiment, a system includes a sight tube configured to optically communicate with an interior of a rotary machine via insertion within an inspection port. The sight tube includes a window and multiple openings configured to direct purge air across the window. The system also includes a curtain tube disposed about the sight tube and configured to direct purge air from a first air source to the openings via a first passage formed between an inner surface of the curtain tube and an outer surface of the sight tube. The curtain tube includes multiple outlets configured to direct curtain air around the window, and the curtain tube is configured to direct the curtain air from a second air source to the outlets via a second passage formed between an outer surface of the curtain tube and an inner surface of the inspection port.

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1. A system comprising: a sight tube configured to optically communicate with an interior of a rotary machine via insertion within an inspection port;a first interchangeable nozzle tip removably secured to the sight tube, wherein the first interchangeable nozzle tip comprises a window and a pluralit

1. A system comprising: a sight tube configured to optically communicate with an interior of a rotary machine via insertion within an inspection port;a first interchangeable nozzle tip removably secured to the sight tube, wherein the first interchangeable nozzle tip comprises a window and a plurality of openings configured to direct purge air across the window;a curtain tube disposed about the sight tube and configured to direct the purge air from a first air source to the plurality of openings via a first passage formed between an inner surface of the curtain tube and an outer surface of the sight tube; anda second interchangeable nozzle tip removably secured to the curtain tube, wherein the second interchangeable nozzle tip comprises a plurality of outlets configured to direct curtain air around the window;wherein the curtain tube is configured to direct the curtain air from a second air source to the plurality of outlets via a second passage formed between an outer surface of the curtain tube and an inner surface of the inspection port. 2. The system of claim 1, wherein the first air source comprises an air flow from a compressor powered independently from the rotary machine. 3. The system of claim 1, wherein the first air source comprises a discharge air flow from a compressor rotatably coupled to the rotary machine via a shaft, wherein the discharge air flow is cooled, filtered, or a combination thereof, prior to flowing into the first passage. 4. The system of claim 1, wherein the second air source comprises a discharge air flow from a compressor rotatably coupled to the rotary machine via a shaft. 5. The system of claim 1, wherein the plurality of openings is configured to direct the purge air radially inward across the window. 6. The system of claim 5, wherein the plurality of openings comprises a first row of openings configured to direct the purge air substantially perpendicular to the window, and a second row of openings configured to direct the purge air axially outward from the window. 7. The system of claim 1, wherein the first interchangeable nozzle tip is removably secured to the sight tube via a threaded connection. 8. The system of claim 1, wherein at least one of the plurality of outlets comprises a recess extending between the second passage and the interior of the rotary machine. 9. The system of claim 1, wherein the first interchangeable nozzle tip comprises an annular protrusion configured to block movement of the window toward the interior of the rotary machine. 10. The system of claim 1, wherein the second interchangeable nozzle tip comprises an annular protrusion configured to block movement of the first interchangeable nozzle tip toward the interior of the rotary machine. 11. A system comprising: a sight tube configured to optically communicate with an interior of a rotary machine via insertion within an inspection port, wherein the sight tube comprises a window and a plurality of openings configured to direct purge air across the window; anda curtain tube disposed about the sight tube and configured to direct purge air from a first air source to the plurality of openings via a first passage formed between an inner surface of the curtain tube and an outer surface of the sight tube;wherein the curtain tube comprises a plurality of outlets configured to direct curtain air around the window, and the curtain tube is configured to direct the curtain air from a second air source to the plurality of outlets via a second passage formed between an outer surface of the curtain tube and an inner surface of the inspection port. 12. The system of claim 11, comprising: a first interchangeable nozzle tip removably secured to the sight tube, wherein the first interchangeable nozzle tip includes the window and the plurality of openings; anda second interchangeable nozzle tip removably secured to the curtain tube, wherein the second interchangeable nozzle tip includes the plurality of outlets. 13. The system of claim 11, wherein the first air source comprises an air flow from a compressor powered independently from the rotary machine. 14. The system of claim 11, wherein the first air source comprises a discharge air flow from a compressor rotatably coupled to the rotary machine via a shaft, wherein the discharge air flow is cooled, filtered, or a combination thereof, prior to flowing into the first passage. 15. The system of claim 11, wherein the second air source comprises a discharge air flow from a compressor rotatably coupled to the rotary machine via a shaft. 16. A system comprising: a sight tube configured to optically communicate with an interior of a rotary machine via insertion within an inspection port; andan interchangeable nozzle tip removably secured to the sight tube, wherein the interchangeable nozzle tip comprises a window and a plurality of openings configured to direct purge air across the window. 17. The system of claim 16, comprising: a curtain tube disposed about the sight tube and configured to direct the purge air from a first air source to the plurality of openings via a first passage formed between an inner surface of the curtain tube and an outer surface of the sight tube; anda second interchangeable nozzle tip removably secured to the curtain tube, wherein the second interchangeable nozzle tip comprises a plurality of outlets configured to direct curtain air around the window;wherein the curtain tube is configured to direct the curtain air from a second air source to the plurality of outlets via a second passage formed between an outer surface of the curtain tube and an inner surface of the inspection port. 18. The system of claim 16, wherein the interchangeable nozzle tip is removably secured to the sight tube via a threaded connection. 19. The system of claim 16, wherein the plurality of openings is configured to direct the purge air radially inward across the window. 20. The system of claim 19, wherein the plurality of openings comprises a first row of openings configured to direct the purge air substantially perpendicular to the window, and a second row of openings configured to direct the purge air axially outward from the window.