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SPRING HANGER S
CATALOGUE No . 2
E. MYATT S. CO .101 Brisbane Rd ., Toronto, Ontario M3J 2K5
TABLE OF CONTENTS
The RIGID a SPRING Principle s- 1Installation instructions s- 1Features s- 2General information s-2Typical applications s- 2Design details s- 3Selection procedure and Example s-4Load-deflection table s-5
Fig. 805 RIGID Ar SPRING . . . s- 6Fig. 810 RIGID ,r SPRING . . . . s-8Fig. 820 RIGID *' SPRING s-10Fig. 870 Light Duty Spring Hanger . . s- 13Fig. 880 Spring Cushions s-13Fig. 890 Sway Brace s-14Constant Support Hangers s- 14
Wherever piping is subject to vertical movement, a simple rigid hangercan only provide proper support for the pipe in one position . Thefunction of a spring hanger is to provide continuous support for th epipe in all positions and relieve pipe stresses which could reach critica lproportions in the pipe itself or in connected equipment .
The purpose of this catalog is to provide clearly detailed informatio nfrom which suitable spring units can be selected for the widest possibl evariety of applications .
Our engineering staff will be pleased to review your pipe suspensio nproblems with you, whether they apply to high temperature power plan tpiping or to cryogenic applications with temperatures to -320 F .
INSTALLATIO NINSTRUCTION S
THE RIGID ,Ar SPRING PRINCIPL EAS RECEIVED IN FIEL D
AND ERECTE D
INSTALLE Das a
RIGID HANGE R
The locked spring assembly support sand holds the erected pipe a t
AFTER HYDROSTATI CPIPE LINE TEST
OPERATE Sas a
With lock-bolts removed the spring i sfree to support pipe as it expands t o
SPRING PRINCIPL E
The RIGID ,00` SPRING employs a unique design which overcomes the many difficulties inherent i nthe 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 lockedagainst 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 .
Install the RIGID ,r SPRING as if it were a component part of a simple rigid pipe hanger . Take upall 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 eside-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 soperating (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 springlocking feature eliminates the need for extra long hanger rod threads and their tendency to strip whe nbeing 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
RIGID Ar SPRIN G
Springs are manufactured to requirements of th eManufacturers Standardization Society MSS-SP-5 8
Helical steel springs are pre-compressed to conserveheadroom .
All springs are calibrated and pre- set to the pipe"COLD" load before shipment .
Each unit is furnished with a metal load indicatorscale easily readable from a distance .
A welded steel housing protects the spring and allowsfull view of the spring operation through its full rangeof movement .
The turnbuckle affords ample adjustment for the R Hthreaded lower hanger rod .
A heavy coat of high quality paint protects the uni tagainst 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 .
GENERAL INFORMATIO N
RIGID r 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, andin 21 different sizes to accommodate pipe load sranging from 53 lb to 28,680 lb .
Special designs are obtainable on application .
Recom maximu mvertical pipe mvmtin working range
Total availablespring deflectionincluding reserv e
805 1/2" 1-3/4 "810 1" 3-1/2 "820 2" 7"
RIGID SPRINGS are designed to allow approxi-mately 20% load variability (standard for non-criticalpipe lines) between the COLD and HOT pipe positions .
Spring variability is conveniently expressed in percent, and is determined by the formulas :
Variability (%)Difference between HOT and COLD load (or) Pipe movement x Spring Scale
Calculated (HOT) load
Calculated (HOT) load
E. MYATT & CO .
, TORONTO ONTARIO
TYPICAL APPLICATION S
Type C Type D Type E
Type F Type G
RIGID At' SPRING
Design details of our eight (8) standard Type sof RIGID SPRING assemblies are illustrat-ed here .
Type A is equipped with a RH tapped connectionfor the upper hanger rod . The turnbuckle per-mits ample adjustment for the RH threaded low-er hanger rod at all deflection positions of th espring .
Type B and Type C are furnished with one and tw oupper plates welded to the top of the springhousing to permit bolted assembly to our stand-ard 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 ddesign for installation on structural channel sspaced back to back to allow clearance for th ehanger rod.
Type F is an adjustable base mounted spring forthe support of base elbows or horizontal pipe sfrom beneath. The assembly is available wit hany form of modified upper connection .
Type G and Type H trapeze spring hangers arefor suspension of horizontal pipe lines . Turn -buckles provide adjustment for RH threade dhanger rods .
All RIGID ,V SPRING assemblies are furnishe dwith our patented load-locking device which prevent sspring deflection UP or DOWN until the side-lockin gbolts are withdrawn .
Load columnL-, guide availabl
I l i
E . MYATT & CO .
, TORONTO ONTARIOs-a
RIGID Ar SPRINGSPRING SELECTION PROCEDUR E
The Selection Procedure and a typical Example are outlined here for your use .
1 . Calculate the actual pipe weight to be sup -ported and tabulate as the pipe operating(HOT) load .
2. Calculate amount and direction of pipe verti-cal movement from COLD to HOT position .
3. Select Spring Figure No ., applying movementwithin limitations as recommended hereo nfor approximate spring variability of 20% ;
Recom max pipe
Use Springvertical mvmt
8051" 81 02" 82 0
Or determine permissible hanger load varia-tion between COLD and HOT condition to sui tparticular 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 npage s-5 by reversing the direction of pip emovement .
6. Both COLD and HOT load must be in sam evertical column headed Spring Size .
Note that Spring No . 7 would notsatisfy this condition .
1 . Data: Calculated (HOT) load = 600 lbs
3 . Select Fig 810 Spring (since pipe movementis less than 1") .
4. 600 lb load is in column headed Spring Siz eNo. 8 .
5. From Table on page s-5 ,
Fl( ; .8 81 0
(HOT) 6001" 7/8" REVERSE D
(COLD) 731 -.-1-7/8"pipe mvmt
6. Select Spring Size No . 8 .
600 lb HOT load731 lb COLD load
2 . Data : Pipe movement(COLD to HOT) = 7/8" UP
7. Assume ample headroom is available forType A Spring.
8. Specify :Size No . 8Fig . 810 RIGID .' SPRINGType AHOT load 600 l bCOLD load 731 l bPipe mvmt 7/8" UP
E . MYATT & CO . LTD., TORONTO ONTARIO
7 . Determine Spring Type. See page s-2 forTypical Applications .
8 . Specifications are now complete and read yfor ordering .
LOAD-DEFLECTIO NTABL E
RIGID .~` SPRING
The RIGID .' SPRING Load-Deflection tabl eshown on this page is a graphic chart of springdeflections from minimum load to maximu mload positions .
RESERVED AREA (gray) A portion of the totalavailable deflection at each end of the springmovement is reserved to provide for some underor over-loading due to insulation, fittings o rvalves which may be lighter or heavier thananticipated .
WORKING RANGE (white) The white area in th ecentral portion of the chart represents the springworking range . Both HOT and COLD load posi-tions must be in the same vertical column unde rSpring Size, and within the actual working range .
RATED LOAD We recommend that every springwhich is selected operate as closely as passibl eto its RATED LOAD shown in boldface type an dlocated in the middle of the working range .