Piping Specialty Item Design Guide

PROCEDURE NO.

PTD-DGS-127 PREPARED BY

PROCESS TECHNOLOGY PROCEDURES

Edited from existing doc by J.R. Barnhart

PAGE

1

OF

3

DATE

April 30, 2000

APPROVED BY DEPARTMENT: SUBJECT:

PROCESS ENGINEERING

PIPING SPECIALTY ITEM DESIGN GUIDE

JRB REVISION DATE

11/08/02

1.0

REV.

1

SCOPE

This design guide defines the method for establishing the requirements for items specified by the piping materials group that are not included in the piping material specification. These items are called piping specialty (SP) items. 2.0

RESPONSIBILITY

The process engineer identifies and describes items on the piping and instrumentation diagram (P&ID) that are not in the piping material specifications. The piping materials engineer numbers, tracks, and completes information about an item and writes the specification. Some routine items are completely specified by the piping materials engineer; however, most items shall have the process information described by the mechanical process section. 3.0

PROCEDURE

The process engineer reviews the P&IDs to identify items that are not shown in the piping material specifications. If the item can be added to the specification, the process engineer will check with the piping materials group; otherwise, the Piping Specialty Item Process Data Sheet, should be filled out as follows: 1. Required information describes where the item appears on the drawings, the person originating the request, and other relevant information. This section should be completely filled out by the originator. 2. The body of the form contains typical data for SP items, but it is not comprehensive. Additional information should be added under notes at the bottom of the form. 3. The "notes" space on the form should contain information not shown in the table body. Items might include bore size, locking device, operator type, applicable code, actuator fluid pressure, firesafe, tight shutoff, contaminant size/condition, design differential pressure, gasket type, or seal type. The completed form should be transmitted to the piping materials group for completion of the SP items specification.

5.0

EXHIBITS

The following exhibit is referenced in this design guide: Exhibit 1

Title PTD-DA-122 - Piping Specialty Item Process Data Sheet

PROCEDURE NO.

REV.

DATE

PTD-DGS-127

1

11/08/02

PAGE OF

2

4

PIPING SPECIALTY ITEM DESIGN GUIDE

P&ID Number/Location

Piping Specialty Item Request Description

Line Number/Specification

Design Temperature

A

Operating Pressure

Operating Temperature

B

Fluid

Requested By

Specialty Item Manufacturer Model Size End connections Body material Trim material Lining material Fact-to-face dimension Length Right or left hand Bypass size Capacity Sizing Flow Pressure drop Design flow Minimum flow Cv Backpressure

Specific Gravity

Notes

A – Information that is a process requirement B – Information needed as to how the item will be supplied

Exhibit 1 - Piping Specialty Item Request (PTD-FRM-____)

Design Pressure

Requested Date