DMA De-Superheater Instruction Manual

Page 1

Instruction Manual Form 5296 April 2001

Design DMA and DMA/AF

Design DMA and DMA/AF Mechanically Atomized Desuperheaters Contents Introduction

............................... Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Principle of Operation Installation

1 1 1 2

.................... 2

................................. 3

Maintenance

............................... 6 Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 W6298 / IL

Introduction

Figure 1. Design DMA/AF Mechanically Atomized Desuperheater

Scope of Manual This instruction manual includes installation, maintenance, and operation information for the Design DMA and DMA/AF mechanically atomized desuperheaters.

nozzle and 10:1 with the AF nozzle). These ruggedly constructed devices are capable of maintaining final temperatures to within 6 to 8_C (10 to 15_F) of saturation.

Only personnel qualified through training or experience should install, operate, and maintain a Design DMA and DMA/AF desuperheater. If you have any questions about these instructions, contact your Fisher sales office before proceeding.

The desuperheaters come with either a standard fixed orifice type spray nozzle or the AF nozzle, which can give greater turndown with its variable geometry design. Multiple nozzle units are available with the AF nozzle for higher spraywater quantity applications.

Desuperheaters of the mechanical-atomizing type are generally used for applications with near-constant loads. The Design DMA and DMA/AF mechanically atomized desuperheaters (figure 1) were designed for these applications as well as those requiring moderate turndown ratios (that is, up to 3:1 with the standard

D101617X012

Description

The Design DMA and DMA/AF desuperheaters can be installed in pipe headers, elbows, tees, and other similar pipe fittings. They can be installed directly into the header through an opening as small as a standard 3-inch ANSI raised-face flange connection. Installation causes no appreciable pressure loss due to obstruction of flow. The use of multiple AF nozzles allows for optimum turndown ratio, spraywater quantity, and serviceability.


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.