Engine Exhaust Power Generation

HT1100A-MTFM (HT593C-A-MTFM)

INTRODUCTION

Shannon design HT1100A-MTFM is specific to a Petro Chemical Process High Temperature Environment, a non-wicking Design. Conditions are severe and problematic but most important, this design is non-porous at high temperature, producing a self-contained insulation system that is still removable and re-usable. Conditions of hot oil, hydrocarbon, chemical and most acidic and basic environments while at the same time, generating acoustic performance targets to meet the standard.

Common Applications and Markets
Shannon Acoustic Blanket Applications include: Steam Turbines, Gas Turbines, Exhaust Ducting, Exhaust Piping, Diffusers, Process Pumps, Turbines, Vessels, Heat Exchangers, Process Piping, Flanges, Fittings, Equipment & Equipment Heads.

Service Temperature
This design is a Thermal/Acoustic Noise Reduction Barrier with a service temperature to 1100˚F (593˚C).

Acoustic Performance
4 – 15 dBA Reduction Overall

Finished Surface Mass
1.7lb/ft² (8.3kg/m²) to 3.7lb/ft² (18.1kg/m²)

Blanket Components
The Outer Jacketing consists of a layer of Stainless Steel Type 304 Knitted Wire Mesh .011” Dia. @ 16ft²/LB (0.28 mm Dia. @ 3.3 m²/kg) and a layer an Outer Jacketing of 16.5oz/yd² (560g/m²) PTFE Teflon® Impregnated Fiberglass Cloth and Mass Loaded Vinyl “Reflector” – 1.0lb/ft² (4.9kg/m²)-2.0lb/ft² (9.8kg/m²). The inner jacketing consists of a layer of Stainless Steel Type 304 Sheet Foil .002” (.05mm) thickness and a layer of Stainless Steel Knitted Wire Mesh. The Insulation Core Material is an 11 lb/ft³ (176.2 kg/m³) Fiberglass Needled Mat-Type E Fiber and will act as an “Absorber” of noise energy. The Fiberglass Mat is encapsulated by the inner and outer layers of jacketing, then stapled together, producing a Self Contained Blanket System. The Blanket System includes an Integral Fastener for install & removal. The combination of reflection and absorption will generate given expectations of noise reduction with varying surface mass and varying blanket thickness.

Steam Inlet T&T Valve to Steam Turbine
Blanket Thickness Surface Temperature Reference
Operating Temp
Thickness
Surface Temp
Thickness
Surface Temp
Thickness
Surface Temp
371˚ C (700˚ F) 40 mm (1.5″) 69.2˚ C (156.5˚ F) 50 mm (2″) 59.8˚ C (139.6˚ F) 65 mm (2.5″) 53.6˚ C (128.4˚ F)
427˚ C (800˚ F) 40 mm (1.5″) 79.2˚ C (174.6˚ F) 50 mm (2″) 68.1˚ C (154.5˚ F) 65 mm (2.5″) 60.7˚ C (141.2˚ F)
482˚ C (900˚ F) 40 mm (1.5″) 90.3˚ C (194.5˚ F ) 50 mm (2″) 77.2˚ C (171.0˚ F ) 65 mm (2.5″) 68.6˚ C (155.4˚ F )
538˚ C (1000˚ F) 50 mm (2″) 87.4˚ C (189.4˚ F) 65 mm (2.5″) 77.3˚ C (171.2˚ F) 80 mm (3″) 70.1˚ C (158.1˚ F)
593˚ C (1100˚ F) 50 mm (2″) 98.7˚ C (209.7˚ F) 65 mm (2.5″) 87.1˚ C (188.8˚ F) 80 mm (3″) 78.7˚ C (173.7˚ F)

* The above referenced Cold Face Surface Temperatures should be used as guidelines for blanket insulation thickness design.
* The Cold Face Surface Temperature of the blanket should approach surrounding ambient temperature conditions.
* The economic thickness of the blanket should consider blanket cost, thermal performance and blanket design constraints.
* Heat loss calculations are based on a 21.1˚ C (70˚ F) ambient temperature using a flat surface condition.

THICKNESS
SURFACE MASS
Noise Reduction Range
1” (2.5CM) 1.8 lb/ft² to 2.8 lb/ ft² (8.8-13.7kg/m²) 1.5 DBA to 6 DBA Reduction
1 ½” (3.8CM) 2.2 lb/ ft² to 3.2 lb/ ft² (10.7-15.6kg/m²) 4 DBA to 8 DBA Reduction
2” (5CM) 2.6 lb/ ft² to 3.6 lb/ ft² (12.7-17.6kg/m²) 5 DBA to 10 DBA Reduction
2 ½” (6.4CM) 3.0 lb/ ft² to 4.0 lb/ ft² (14.7-19.5kg/m²) 7 DBA to 13 DBA Reduction

* The above referenced Acoustic Performance should be used as a guideline for blanket insulation thickness design.
* The Acoustic Performance of the blanket should be bench marked against the ambient noise condition.
* The economic thickness of the blanket should be considered in selection of a target reduction with consideration to blanket design constraints.
* Contact Shannon for guidance in selection, as the historical performance of each application varies significantly.

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