• Author / Uploaded
• Tom Borkowski

Citation preview

NEBRASKA BOILER D-Type, A-Type and O-Type Boilers

D-Type

A-Type

O-Type

i 4-03

Nebraska Boiler SECTION 1 — INTRODUCTION CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FACTS ABOUT NEBRASKA BOILER COMPANY STEAM GENERATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FEATURES AND BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PRODUCT OFFERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DIMENSIONS AND RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ENGINEERING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1 1-1 1-1 1-2 1-3 1-3 1-4 1-5

SECTION 2 — D-TYPE BOILERS CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NS-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NS-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NS-C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NS-D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NS-E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NS-F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NSX-G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIFICATIONS FOR D-TYPE SHOP ASSEMBLED WATERTUBE STEAM GENERATING EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1 2-1 2-2 2-3 2-8 2-13 2-18 2-23 2-31 2-39 2-49

SECTION 3 — A-TYPE BOILERS CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL N2S-4A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL N2S-7S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL N2S-8S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIFICATIONS FOR A-TYPE SHOP ASSEMBLED WATERTUBE STEAM GENERATING EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1 3-1 3-1 3-2 3-7 3-12 3-20

SECTION 4 — O-TYPE BOILERS CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NOS-1A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MODEL NOS-2A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPECIFICATIONS FOR O-TYPE SHOP ASSEMBLED WATERTUBE STEAM GENERATING EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ii 4-03

4-1 4-1 4-1 4-2 4-7 4-13

Nebraska Boiler SECTION 5 — STANDARD BURNER SELECTION FOR IWT NEBRASKA CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SIZE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 1 — DESIGN CONDITIONS AND TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 2 — EQUIPMENT SUPPLY SPECIFICATIONS < 80 PPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 3 — ADDITIONAL COMPONENTS SUPPLY SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 4 — ADDITIONAL COMPONENTS SUPPLY SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SECTION 5 — EXCLUSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1 5-2 5-7 5-11 5-15 5-16 5-16

SECTION 6 — CONTROL GUIDELINES CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BASIC BOILER CONTROL GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-1 6-1 6-2

iii 4-03

Nebraska Boiler

NOTES

iv 4-03

Introduction CONTENTS FACTS ABOUT NEBRASKA BOILER COMPANY STEAM GENERATORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FEATURES AND BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PRODUCT OFFERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O-Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Auxiliary Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Basic Model Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DIMENSIONS AND RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-Type Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-Type Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O-Type Boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . All Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ENGINEERING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steam Drum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lower Drum (Mud Drum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steam Separator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ABMA Specifications — Watertube Boilers Recommended Boiler Water Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ASME Specifications — Industrial Watertube Boilers Recommended Water Quality Limits . . . . . . . . . . . . . . . . . . . . Stack Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drum Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Casing, Setting and Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Structural Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-2 1-3 1-3 1-3 1-3 1-3 1-3 1-3 1-3 1-4 1-4 1-4 1-4 1-4 1-5 1-5 1-6 1-6 1-7 1-7 1-8 1-12 1-12 1-12 1-12 1-12

Figure 1-1. Figure 1-2. Figure 1-3. Figure 1-4. Figure 1-5. Figure 1-6.

FIGURES D-Type Drum Internals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-Type Drum Internals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O-Type Drum Internals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-Type Boiler Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-Type Boiler Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O-Type Boiler Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-9 1-10 1-11 1-13 1-15 1-17

Table 1-1. Table 1-2. Table 1-3. Table 1-4. Table 1-5. Table 1-6. Table 1-7. Table 1-8.

TABLES D-Type, Nominal Boiler Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-Type, Nominal Boiler Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O-Type, Nominal Boiler Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Drum Size and Thickness (Based on 250 PSIG Design) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ABMA Specifications — Watertube Boilers Recommended Boiler Water Limits . . . . . . . . . . . . . . . . . . . . . . . . ASME Specifications — Industrial Watertube Boilers Recommended Water Quality Limits . . . . . . . . . . . . . . . . Stack Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Altitude Correction Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-4 1-5 1-5 1-5 1-7 1-7 1-8 1-8

1-1 4-03

Introduction

Nebraska Boiler

FACTS ABOUT NEBRASKA BOILER COMPANY STEAM GENERATORS • Steam capacities from 10,000 to 275,000 Lbs./Hr. are available shop assembled. • Design pressures to 1,500 psig with steam temperatures to 1,050ºF are available. Complete boiler package designs can include economizers or air preheaters for increased efficiency. • Units are available for a wide variety of fuels including gases, liquids and solids. • Burners and controls are selected on a per job basis to incorporate the best available technology. • Years of experience and customer preferences determine selection of valves and trim for each application. • Conservatively designed tube layouts, coupled with large drums, provide superior natural circulation and operational characteristics. • Large, water cooled, gas-tight furnace areas are utilized to yield optimum emissions performance and boiler reliability and longevity. • Furnace construction utilizes a proven welded-membrane wall design backed by more than 40 years of experience. • Convection or radiant superheaters with proven designs are selected for your final required steam temperature and desired operating characteristics. • Fully-welded gas seals are used throughout to ensure gas-tight operation. • Heavy gauge outer casing is suitable for indoor or outdoor installations. • Boiler endwall constructions are available as either refractory, high-duty ceramic fiber, or water cooled membrane to meet your specific application.

1-2 4-03

Nebraska Boiler

Introduction

FEATURES AND BENEFITS

O-Type

The following features and benefits apply to Nebraska Industrial Watertube Boiler Products.

Nebraska Boiler O-Type Boilers are designed for capacities from 10,000 to 80,000 Lbs./Hr. Consult staff engineering on the availability and requirements of larger sizes. Units are symmetrical in load, and designed to comply with over-theroad height, width and weight requirements for ease of shipment.

Boilers Membrane Boiler Wall: • Maximizes heat transfer and minimizes refractory maintenance with a proven membrane wall or ceramic fiber construction. Convection Section Design: • Provides low draft loss proper gas side tube cleaning with inline tube spacing. • Maximizes heat transfer and even distribution of the flue gases through the utilization of vertical baffles when needed. Drum Internals: • Nebraska’s proven drum internals, designed in conjunction with larger drum diameters, ensure stable water levels and low carryover under dynamic load conditions.

Auxiliary Equipment Engineered packages are available including the following auxiliaries: • Steam trim • Feedwater trim • Low NOx burners • Burner Management System • Combustion and feedwater controls • Forced draft fans • Economizers

Boiler Settings: • 10 Gauge outer casing provides protection suitable for indoor or outdoor installations. • A welded heavy beam and channel boiler base results in uniform distribution over the entire foundation area. • Provides maximum support for the boiler vessel.

PRODUCT OFFERING D-Type Nebraska Boiler shop assembled D-Type Boilers are designed for capacities from 10,000 to 225,000 Lbs./Hr., 200 to 1,500 psig design pressure, and steam temperatures to 1,050ºF. Larger capacities are available with modular designs.

• Ducts and breeching • Exhaust stacks • Access platforms and ladders • Deaerators • Chemical feed systems • Blowdown systems

Basic Model Numbering NS . . . . . . . . . . . . . . D-Type Boiler N2S . . . . . . . . . . . . . A-Type Boiler NOS . . . . . . . . . . . . O-Type Boiler

A-Type Nebraska Boiler A-Type Boilers are designed for capacities from 10,000 to 275,000 Lbs./Hr. Symmetrical design increases shipping ease for larger capacities. The top outlet provides vertical flue-gas ducting. Lower draft losses result in smaller fans and lower operating cost.

1-3 4-03

Introduction

Nebraska Boiler

DIMENSIONS AND RATINGS

Table 1-1. D-Type, Nominal Boiler Capacities MODELS

D-Type Boilers

NS-A

The following illustrations (Figures 2-1 to 2-7) show dimensions for the Industrial Watertube Product offering.

NS-B

• Table 2-2. Model NS-A Dimensions • Table 2-6. Model NS-B Dimensions • Table 2-10. Model NS-C Dimensions

NS-C

• Table 2-14. Model NS-D Dimensions • Table 2-18. Model NS-E Dimensions • Table 2-22. Model NS-F Dimensions NS-D

CAPACITY (LBS./HR.)

NO. OF ROWS

10,000

28

15,000

42

15,000

26

20,000

32

25,000

40

30,000

46

35,000

52

30,000

40

35,000

46

40,000

52

45,000

56

50,000

58

40,000

43

45,000

49

A-Type Boilers

50,000

53

55,000

57

The following illustrations (Figures 3-1 to 3-3) show dimensions for the Industrial Watertube Product offering.

60,000

61

• Table 2-26. Model NSX-G Dimensions

NS-E

50,000

49

• Table 3-2. Model N2S-4A Dimensions

55,000

51

60,000

53

• Table 3-6. Model N2S-7S Dimensions

65,000

56

• Table 3-10. Model N2S-8S Dimensions

70,000

60

75,000

62

O-Type Boilers

80,000

64

85,000

66

90,000

68

95,000

70

The following illustrations (Figures 4-1 and 4-2) show dimensions for the Industrial Watertube Product offering. NS-F

70,000

56

75,000

58

80,000

60

All Types

85,000

62

90,000

66

• Tables 1-1 to 1-3 show the basic product configuration and capacities.

95,000

70

100,000

72

110,000

78

120,000

82

• Table 4-2. Model NOS-1A Dimensions • Table 4-6. Model NOS-2A Dimensions

NSX-G

1-4 4-03

100,000

72

125,000

88

150,000

98

175,000

110

200,000

116

225,000

120

Nebraska Boiler

Introduction

Table 1-2. A-Type, Nominal Boiler Capacities MODELS N2S-4A

N2S-7S

N2S-8S

NOS-1A

NOS-2A

The following engineering data will assist in selecting and specifying Nebraska Industrial Watertube Boilers.

NO. OF ROWS

10,000

20

20,000

29

30,000

39

40,000

49

Table 1-4. Drum Size and Thickness (Based on 250 PSIG Design)

50,000

59

STEAM DRUM

WATER DRUM

55,000

63

60,000

55

NS-A

30" ID x 5/8"

24" OD Sch 30

75,000

62

NS-B

36" ID x 5/8"

24" OD Sch 30

100,000

75

NS-C

36" ID x 5/8"

24" OD Sch 30

125,000

88

NS-D

36" ID x 5/8"

30" ID x 5/8"

150,000

95

NS-E

42" ID x 5/8"

30" ID x 5/8"

175,000

106

NS-F

48" ID x 3/4"

30" ID x 5/8"

150,000

85

NSX-G

54" ID x 3/4"

32" ID x 5/8"

175,000

92

200,000

100

225,000

110

250,000

118

275,000

126

Table 1-3. O-Type, Nominal Boiler Capacities MODELS

ENGINEERING DATA

CAPACITY (LBS./HR.)

CAPACITY (LBS./HR.)

NO. OF ROWS

D-TYPE

A-TYPE N2S-4A

36" ID x 5/8"

(2) 24" Sch 30

N2S-6

42" ID x 5/8"

(2) 24" Sch 30

N2S-75

48" ID x 3/4"

(2) 24" Sch 30

N2S-85

54" ID x 3/4"

(2) 24" Sch 30

NOS-1A

36" ID x 5/8"

24" Sch 30

NOS-2A

36" ID x 5/8"

24" Sch 30

O-TYPE

10,000

24

20,000

40

30,000

55

40,000

70

See Table 1-4.

40,000

48

50,000

53

60,000

61

70,000

67

80,000

75

All drums are of welded construction in strict conformance with the ASME Power Boiler Code. All drums are stress relieved and welded seams are radiographed and hydrostatically tested at 1-1/2 times design pressure. The drum incorporates elliptical dished heads with 12" x 16" manholes on each end, and is wholly supported by the tubes so no extra supporting steel is required. All tubes are expanded into serrated drum tube holes.

Above sizing selections are based on an operating pressure of 150 psig with a 227ºF feedwater supply temperature to the boiler (no economizer). Natural gas and oil fuels assumed. All of the above boilers are available with superheaters. These units must be selected by your factory sales representative. Selections may vary with each specific job. The addition of an economizer adds heating surface, which may reduce the number of rows.

Steam Drum

The steam drum has the following external connections: Qty. One (1) Two (2) As required One (1) One (1) or Two (2) Two (2) One (1) Two (2) One (1) One (1) Two (2)

Item Description Main Steam Outlet, flanged 12" x 16" Manways Safety Valve Connections, flanged Blowdown Connection, screwed Sootblower Connections, screwed Water Column Connections, screwed ALWCO Connections, screwed Drum Level Connections, screwed Chemical Feed Connection, screwed Vent Valve, screwed Lifting Lugs

1-5 4-03

Introduction

Nebraska Boiler

The steam drum is fitted with an internal feed pipe, chemical feed pipe and blowdown piping. Water level control baffling is installed to ensure that all steam released from the generating tubes is released behind the baffles and not through the water level. Steam drum internals consist of steam separators or dryers that are installed to ensure the steam concentrations are maintained in accordance with ABMA recommendations. Special drum internals for more stringent moisture content are available. See Figures 1-1 to 1-3 for illustration of drum internals.

Steam Separator STEAM SEPARATOR SELECTION Dry Pipe Separators:

The standard dry pipe separator shall be used on all units which meet the following criteria: 1. Boiler rated capacity less than 40,000 Lbs./Hr. 2. Saturated steam (no superheater on unit). 3. 0.5% moisture in steam allowed.

Lower Drum (Mud Drum)

Labyrinth Separators:

See Table 1-4. The lower drum(s) is stressed relieved, seams are radiographed and hydrostatically tested at 1-1/2 times design pressure. The drum(s) incorporates two (2) 12" x 16" manways, one at each end and one or two 1-1/2" or 2" flanged blowdown connection(s). Internally, the drum(s) has a blowdown guide baffle to ensure effective blowdown of the lower drum(s) without disturbing water circulation in the unit. The drum(s) is supported by the structural steel frame and has welded guide lugs that fit into the base frame.

1-6 4-03

The standard Labyrinth Separator shall be used to meet the following criteria: 1. Boiler capacity higher than 40,000 Lbs./Hr. 2. Superheated unit. 3. 1 ppm steam purity required. NOTICE Consult staff engineering for special separator requirements.

Nebraska Boiler

Introduction

ABMA Specifications — Watertube Boilers Recommended Boiler Water Limits Recommended Boiler Water Limits and Associated Steam Purity at Steady State Full Load Operation Table 1-5. ABMA Specifications — Watertube Boilers Recommended Boiler Water Limits DRUM TYPE BOILERS RANGE TOTAL DISSOLVED SOLIDS BOILER WATER PPM (MAX)

RANGE TOTAL ALKALINITY BOILER WATER PPM

SUSPENDED SOLIDS BOILER PPM (MAX)

RANGE TOTAL DISSOLVED SOLIDS STEAM PPM (MAX EXPECTED)

0 – 300 301 – 450 451 – 600

700 – 3,500 600 – 3,000 500 – 2,500

140 – 700 120 – 600 100 – 500

15 10 8

0.2 – 1.0 0.2 – 1.0 0.2 – 1.0

601 – 750 751 – 900 901 – 1,000

200 – 1,000 150 – 750 125 – 625

40 – 200 30 – 150 25 – 125

3 2 1

0.1 – 0.5 0.1 – 0.5 0.1 – 0.5

1 N/A N/A N/A

0.1 0.1 0.05 0.05

N/A

0.05

DRUM PRESSURE PSIG

1,001 – 1,800 1,801 – 2,350 2,351 – 2,600 2,601 – 2,900

100 50 25 15

1,400 and Above

0.05

ONCE THROUGH BOILERS N/A

ASME Specifications — Industrial Watertube Boilers Recommended Water Quality Limits Industrial Watertube Boilers — Suggested Water Quality Limits Makeup Water Percentage: Up to 100% of Feedwater Conditions: No superheater, turbine drives or process restriction on steam purity Steam Purity (7): 1.0 mg/l (ppm) TDS maximum Table 1-6. ASME Specifications — Industrial Watertube Boilers Recommended Water Quality Limits FEEDWATER LIMITS Drum Operating MPa Pressure (psig)

0 – 2.07 (0 – 300)

2.08 – 3.10 (301 – 450)

3.11 – 4.14 (451 – 600)

4.15 – 5.17 (601 – 750)

5.18 – 6.21 (751 – 900)

6.22 – 6.89 (901 – 1,000)

6.90 – 10.34 (1,001 – 1,500)

10.35 – 13.79 (1,501 – 2,000)

Dissolved Oxygen