March Process Industry Practices Structural. PIP STE05535 Vessel Circular Platform Detail Guidelines

Transcription

1 Structural

2 PURPOSE AND USE OF PROCESS INDUSTRY PRACTICES In an effort to minimize the cost of process industry facilities, this Practice has been prepared from the technical requirements in the existing standards of major industrial users, contractors, or standards organizations. By harmonizing these technical requirements into a single set of Practices, administrative, application, and engineering costs to both the purchaser and the manufacturer should be reduced. While this Practice is expected to incorporate the majority of requirements of most users, individual applications may involve requirements that will be appended to and take precedence over this Practice. Determinations concerning fitness for purpose and particular matters or application of the Practice to particular project or engineering situations should not be made solely on information contained in these materials. The use of trade names from time to time should not be viewed as an expression of preference but rather recognized as normal usage in the trade. Other brands having the same specifications are equally correct and may be substituted for those named. All Practices or guidelines are intended to be consistent with applicable laws and regulations including OSHA requirements. To the extent these Practices or guidelines should conflict with OSHA or other applicable laws or regulations, such laws or regulations must be followed. Consult an appropriate professional before applying or acting on any material contained in or suggested by the Practice. This Practice is subject to revision at any time by the responsible Function Team and will be reviewed every 5 years. This Practice will be revised, reaffirmed, or withdrawn. Information on whether this Practice has been revised may be found at (PIP), Construction Industry Institute, The University of Texas at Austin, 3925 West Braker Lane (R4500), Austin, Texas PIP member companies and subscribers may copy this Practice for their internal use. Changes, overlays, addenda, or modifications of any kind are not permitted within any PIP Practice without the express written authorization of PIP. PIP will not consider requests for interpretations (inquiries) for this Practice. Not printed with State funds

3 Structural Table of Contents 1. Introduction Purpose Scope References Platform Design Loads Additional Platform Design Considerations...3 Page 1 of 3

4 March Introduction 1.1 Purpose This Practice provides guidance for the engineers who are designing circular platforms in accordance with PIP STF05535, Vessel Circular Platform Details, and for the engineers who design the vessels to support these vessel platforms. 1.2 Scope This Practice describes the design basis for the platforms detailed in PIP STF05535 and circumstances that should be considered before using PIP STF A table showing the platform design loads for the vessel clips is provided. The table should be used to check whether a vessel requires reinforcement to receive the platform loads. 2. References Applicable parts of the following Practices shall be considered an integral part of this Practice. The edition in effect on the date of contract award shall be used, except as otherwise noted. Short titles will be used herein where appropriate. 2.1 (PIP) PIP STC Structural Design Criteria PIP STF Vessel Circular Platform Details 3. Platform Design Loads 3.1 The platform design loads provided in Table 1 are based on a 6-ft (1,830-mm) arc length of outside platform perimeter between the supporting brackets for the platform detailed in PIP STF The platform design loads provided in Table 1 are based upon a live load of 75 psf (3.6 kn/m2) as required by PIP STC01015 and the dead load of the actual material weight. 3.3 The concentrated load of 1,000 lb (4.5 kn) on an area of 2 ft - 6 inches x 2 ft - 6 inches (750 mm x 750 mm) required by PIP STC01015 will normally not govern the clip design and is not used for the platform detailed in PIP STF However, the engineer should consider specific cases to verify the governing case. Page 2 of 3

5 Table 1. Platform Design Loads Platform Width V M 1 M 2 mm Kips kn Kip-Ft kn-m Kip-Ft kn-m up to 3'-0" up to '-6" '-0" '-6" '-0" '-6" '-0" Where: V = Shear at centerline of bolts M 1= Moment at face of haunch for beam design M 2= Moment at centerline of bolts for bolt and bracket design ( Bracket refers to the section of the combined beam channel and gusset plate.) Note: Moment for vessel clip design is equal to M 2 + (V) (X), where X is the distance from the centerline of bolts to the face of the vessel. 4. Additional Platform Design Considerations 4.1 The beam, bolt, and haunch design should be checked if either of the following conditions applies: a. Additional loading from pipe supports, maintenance loads, etc., exists b. The temperature of the vessel attachment (i.e., clip, bolts, bracket) is above 350 F (175 C) 4.2 Modification of the design and/or the addition of personnel protection may be required for the circumstances described in paragraph If serrated grating is used in lieu of plain grating, the serrated grating capacity should be verified for platform width. Page 3 of 3