THIRD STAGE NOZZLE

PART CHARACTERISTICS
Ansaldo Thomassen P/N:
76BXT300-G002

Interchangeable with GE P/N:
112E6642G003

Kit includes:
7x standard nozzle segments
4x split line nozzle segments
2x instrumented nozzle segments
3x borescope nozzle segments
assembled with diaphragms
Installation hardware

Base alloy:
Similar to GTD-222

Coating:
Optional

Firing temperatures:
Up to 1140°C (2084°F)

Inspection intervals:
24.000 EOH

COMPONENT HIGHLIGHTS
Operating conditions
Due to the specific design the ANSALDO THOMASSEN 6B third stage nozzle is suitable for:

• Suitable for PG6581 configuration
• Firing temperatures up to 1140°C (2084°F)
• Suitable for all gas turbine fuels

Design
The nozzles are fabricated with the investment casting process and are made of an advanced nickel base alloy. This weldable superalloy naturally has a high resistance to corrosion combined with a good creep rupture strength.

In the standard configuration, the nozzles are not coated. Ansaldo Thomassen can advice on coating solutions for specific operating conditions.
A typical coating option consists of a chromide diffusion coating applied to the gas path surfaces by means of chemical vapor deposition. This type of coating is specifically designed for resistance against hot corrosion.

The third stage diaphragms are made of alloy Ni-resist. This casting alloy maintains good corrosion properties at high operating temperatures. The nozzle/diaphragm assemblies are delivered with dog bone type seal strips.
Before delivery a harmonic analysis is conducted on all nozzles to determine the assembly sequence. The delivery includes all applicable installation hardware.

The nozzles are fully interchangeable with GE P/N 112E6642G003, without any modification to the gas turbine.

DESIGN LIFE
The estimated life is 72.000 EOH based on standard operating conditions and after standard inspection and repair intervals.