catalogue spring hangers
Post on 13-Nov-2014
Embed Size (px)
SPRING HANGER S
CATALOGUE No . 2
E . MYATT S. CO .101 Brisbane Rd ., Toronto, Ontario M3J 2K5
TABLE OF CONTENT S
Item The RIGID SPRING Principle Installation instructions Features General information Typical applications Design details Selection procedure and Example Load-deflection table
s- 1 s- 1 s- 2 s- 2 s- 2 s- 3 s- 4 s-5
Fig . 805 RIGID Ar SPRING . . . s- 6 Fig . 810 RIGID SPRING . . . . s- 8 Fig . 820 RIGID *' SPRING s-1 0 Fig . 870 Light Duty Spring Hanger . . s- 1 3 Fig . 880 Spring Cushions s-1 3 Fig . 890 Sway Brace s-1 4 Constant Support Hangers s- 1 4
Wherever piping is subject to vertical movement, a simple rigid hange r can only provide proper support for the pipe in one position . Th e function of a spring hanger is to provide continuous support for th e pipe in all positions and relieve pipe stresses which could reach critica l proportions in the pipe itself or in connected equipment . The purpose of this catalog is to provide clearly detailed informatio n from which suitable spring units can be selected for the widest possibl e variety of applications . Our engineering staff will be pleased to review your pipe suspensio n problems with you, whether they apply to high temperature power plan t piping or to cryogenic applications with temperatures to -320 F .
SPRIN G PRINCIPLE THE RIGID AS RECEIVED IN FIEL D AND ERECTE D
INSTALLATIO N INSTRUCTION S
,Ar SPRING PRINCIPL EAFTER HYDROSTATI C PIPE LINE TES T
* side locking bolts
INSTALLE D as a RIGID HANGE RThe locked spring assembly support s and holds the erected pipe a t
OPERATE S as a SPRING HANGE RWith lock-bolts removed the spring i s free to support pipe as it expands t o
COLD POSITION SPRING PRINCIPL E
The RIGID ,00` SPRING employs a unique design which overcomes the many difficulties inherent i n the installation of variable spring hangers . The helical spring in each unit is pre-set in our shop to the pipe "cold load" position and is locke d against deflection UP or DOWN* until the pipe line is ready for operation, at which time the side locking bolts are removed . The RIGID
r SPRING therefore provides support to the pipe ;(1) In its installed (COLD) position . (2) During expansion from COLD to HOT position . (3) At its operating'(HOT) position .
INSTALLATION INSTRUCTION S SPRING as if it were a component part of a simple rigid pipe hanger . Take u p Install the RIGID all slack in the hanger rod, and then tighten the upper and lower hanger rod lock nuts . After the pipe line and all hangers are completely erected, and the hydrostatic test made, remove th e side-locking bolts from the housing and the spring is free to deflect . Without further adjustment the spring will accurately support the pipe as the pipe expands to it s operating (HOT) position . In event that the pipe line is required to be dismantled, replace the side-locking bolts in the RIGI D ~ SPRING housing and the spring unit can be easily removed and stpred for re-use . The sprin g locking feature eliminates the need for extra long hanger rod threads and their tendency to strip whe n being turned under heavy spring loads . *An exclusive patent of Piping Specialties, Inc . * PATENTED Manufactured in Canada under exclusive Canadian Licence from Piping Specialties Inc ., New York . s- l
NATURES MINERAL INFORMATION RIGID FEATURE S Springs are manufactured to requirements of th e Manufacturers Standardization Society MSS-SP-5 8
. TYPICAL APPLICATION S
SPRIN GTYPICAL APPLICATION S L--
Helical steel springs are pre-compressed to conserv e headroom . All springs are calibrated and pre- set to the pip e "COLD" load before shipment . Each unit is furnished with a metal load indicato r scale easily readable from a distance . A welded steel housing protects the spring and allows full view of the spring operation through its full rang e of movement . The turnbuckle affords ample adjustment for the R H threaded lower hanger rod . A heavy coat of high quality paint protects the uni t against corrosion and rust . The unit is installed as a simple rigid hanger . The spring is positively locked against UP or DOWN * movement until the pipe line is ready to operate .n
GENERAL INFORMATIO N RIGID SPRINGS are manufactured in three (3 ) major groups, identified as Figs . 805, 810 and 820 . Each spring Figure No . is available in eight (8 ) standard Types to satisfy various applications, an d in 21 different sizes to accommodate pipe load s ranging from 53 lb to 28,680 lb . Special designs are obtainable on application . Fig . No . 805 810 820 Recom maximu m vertical pipe mvm t in working range 1/2" 1" 2" Total availabl e spring deflection including reserv e 1-3/4 " 3-1/2 " 7"
RIGID SPRINGS are designed to allow approximately 20% load variability (standard for non-critica l pipe lines) between the COLD and HOT pipe positions .
Spring variability is conveniently expressed in percent, and is determined by the formulas : Variability (%) *Patenteds 2
Difference between HOT and COLD load (or) Pipe movement x Spring Scale Calculated (HOT) load Calculated (HOT) load
E . MYATT & CO .
, TORONTO ONTARIO
DESIG N DETAILS
Design details of our eight (8) standard Type s of RIGID SPRING assemblies are illustrated here . Type A is equipped with a RH tapped connectio n for the upper hanger rod . The turnbuckle permits ample adjustment for the RH threaded lower hanger rod at all deflection positions of th e spring . Type B and Type C are furnished with one and tw o upper plates welded to the top of the spring housing to permit bolted assembly to our standard Fig 530 or Fig 128 upper attachments . Type B may also be used with a Beam Clamp . Type D and Type E are adaptations of the standar d design for installation on structural channel s spaced back to back to allow clearance for th e hanger rod. Type F is an adjustable base mounted spring fo r the support of base elbows or horizontal pipe s from beneath . The assembly is available wit h any form of modified upper connection . Type G and Type H trapeze spring hangers ar e for suspension of horizontal pipe lines . Turn buckles provide adjustment for RH threade d hanger rods . All RIGID ,V SPRING assemblies are furnishe d with our patented load-locking device which prevent s spring deflection UP or DOWN until the side-lockin g bolts are withdrawn .
II Load column L-, guide availab l if specifie d
,. 4, 1 Type D Type E Type F
MYATT & CO .
, TORONTO ONTARIO
SELECTIO N PROCEDURE RIGID
SPRING SELECTION PROCEDUR EThe Selection Procedure and a typical Example are outlined here for your use . PROCEDUR E 1 . Calculate the actual pipe weight to be sup ported and tabulate as the pipe operatin g (HOT) load . 2. Calculate amount and direction of pipe vertical movement from COLD to HOT position . 3. Select Spring Figure No ., applying movement within limitations as recommended hereo n for approximate spring variability of 20% ; Recom max pipe vertical mvmt 1/2" 1" 2" Use Spring Fig . No . 80 5 81 0 82 0EXAMPL E
1 . Data : Calculated (HOT) load = 600 lb s
2 . Data : Pipe movemen t (COLD to HOT) = 7/8" U P 3 . Select Fig 810 Spring (since pipe movemen t is less than 1") .
Or determine permissible hanger load variation between COLD and HOT condition to sui t particular specifications . 4. Locate suitable HOT spring load in Table o n page s-5 and select corresponding Sprin g Size Number . 5. To find COLD load, read from the Table o n page s-5 by reversing the direction of pip e movement . 4. 600 lb load is in column headed Spring Siz e No . 8 .
5. From Table on page s-5 , SP G SIZE 8 600 DEF L Fl( ; . 81 0 1" 7/8" REVERSE D pipe mvmt
(HOT) (COLD) 6. Both COLD and HOT load must be in sam e vertical column headed Spring Size . Note that Spring No . 7 would no t satisfy this condition . 7 . Determine Spring Type . See page s-2 fo r Typical Applications . 8 . Specifications are now complete and read y for ordering .
6. Select Spring Size No . 8 . 600 lb HOT loa d 731 lb COLD loa d 7. Assume ample headroom is available fo r Type A Spring . 8. Specify : Size No . 8 Fig . 810 RIGID .' SPRIN G Type A HOT load 600 l b COLD load 731 l b Pipe mvmt 7/8" U P
E . MYATT & CO . LTD ., TORONTO ONTARI O s-4
LOAD-DEFLECTIO N TABL E
RIGID .~` SPRINGThe RIGID .' SPRING Load-Deflection tabl e shown on this page is a graphic chart of sprin g deflections from minimum load to maximu m load positions . RESERVED AREA (gray) A portion of the total available deflection at each end of the sprin g movement is reserved to provide for some unde r or over-loading due to insulation, fittings o r valves which may be lighter or heavier tha n anticipated . WORKING RANGE (white) The white area in th e central portion of the chart represents the sprin g working range . Both HOT and COLD load positions must be in the same vertical column unde r Spring Size, and within the actual working range . RATED LOAD We recommend that every spring which is selected operate as closely as passibl e to its RATED LOAD shown in boldface type an d located in the middle of the working range . SPRING DEFLECTION The actual spring deflection s in inches and fractions for the three groups o f RIGID ,.' SPRINGS are listed ver