M ETAL ET AL L I C SCI SCIS SSOR SHOE SHOE PRI PRI M ARY SEAL I NSTAL L ATI ON GU GUI DE
M ETAL ET AL L I C SCI SCI SSOR SHOE SHOE PRIM ARY SEAL I NSTAL L ATI ON GUI GUI DE
THI TH I S BOOKL BOOK L ET I S DESI DESI GNED AS A GUIDE GUI DE ONLY ONL Y AND DESCRI DESCRI BES AN I NSTAL NSTAL L ATI ON TECHNIQU TECHNI QUE E THAT HAS PROVEN TO BE EFFI CIENT. CI ENT. WE RECOMMEND THIS BOOKLET BE THROUGHLY REVIEWED BY THE CREW FOREMAN AND THE INFORMATION SHARED WITH THE ENTIRE CREW PRIOR TO SHOE SEA EAL L I NSTA NSTAL L L ATI AT I ON. HM T I S AVAI AV AI L ABL E TO ANSWER ANSWER QUESTI QUESTI ONS AND TO ASSI ASSI ST I N THE EXPL E XPL ANATI ON OF THES TH ESE E PROCEDURES. PROCEDURES. HMT SUPERVISORS ARE AVAILABLE FOR PERSONAL INSTRUCTION AT A DAI L Y RATE PL US EXPENSES EXPENSES..
SAFETY NOTE:…………………………………………………………………… PRIOR TO ENTERING THE FIREWALL, SECONDARY CONTAINMENT, OR CLIMBING/ENTERING THE TANK, ENSURE THAT THE TANK IS SAFE FOR ENTRY AND THAT AL L APP APPL L ICABL E PERMI TS HAVE HAVE BEEN OBTAINED OBTAINED (ENTRY, HOT WORK , CONFI NED SPACE SPACE,, ETC.) ET C.)..
SAFETY NOTE:…………………………………………………………………… ENSURE THAT ALL PIPING HAS BEEN PROPERLY BLINDED AND THAT ALL VAL VES ARE L OCKED OCK ED OR OR TAGGED OUT. OUT.
SAFETY NOTE:…………………………………………………………………… CHECK ALL INTERNAL TANK PIPING, VALVES, INCLUDING ROOF SUPPORT COLUMNS, FLOATING SUCTION LINES, GAUGE POLES, ETC. FOR PRODUCT CONTAI NMENT AND FOR PROPER BL BL OCK I NG AND BL BLII NDI NDI NG. DO NOT ASS ASSUME A TANK I S SAFE FOR ENTRY ENTRY UNTI UNTI L AL L ENTRAPMENT ENTRAPMENT AREAS ARE EXAMI NED. NED.
SAFETY AFE TY NOTE:……………………… NOTE:………………………………………… ………………………………… ………………………………… …………………
TAB LE OF CONTENTS
1.0 General Requirements ……………………………………………………………………………………………5
2.0 Unload Materials ……………………………………………………………………………………………5
3.0 Preparation for Shoe Installation ……………………………………………………………………………………………7
4.0 Shoe Installation ……………………………………………………………………………………………9
5.0 Installation of Primary Fabric …………………………………………………………………………………………..18
6.0 Finishing the Seal ………………………………………………………………………………………….29
METAL L I C SCI SSOR SHOE PRIM ARY SEAL INSTAL L ATI ON GUIDE 1.0
GENERAL REQUIREM ENTS 1.1
Required Tools and Equipment A tool and equipment list follows the text. The tool list represents only the minimum requirement. Ensure that all tools on the list are readily available.
1.2
Personal Safety Equipment (minimum) Hard hat (ANSI Z-89.1) Safety glasses (ANSI Z-87) Work gloves Work shoes Face shield for chip removal processes (ANSI Z-89.1) Hearing protection
2.0
UNLOAD MATERI AL S 2.1
Perform an inventory of the following major items: Number of:
2.2.2 Unpack the scissor hanger assemblies and distributearound the perimeter of the roof. There are three scissor hangers per shoe. Refer to Figure 1 for details. 2.2.3 While unpacking the scissor hanger assemblies, ensure the clevis pin that attaches the scissor mechanism to the rim clip is installed through the middle hole in the rim clip.
2.2.5 Placethe remaining seal parts at a location convenient to the work area of the roof.
3.0
PREPARAT ION FOR SHOE INSTAL L ATION 3.1
Determine the Type of Rim Extension 3.1.1 The type of rim extension will slightly alter the seal installation method when the primary seal fabric is attached to the rim. 3.1.2 Rim Extension Configurations 1. 2.
Vertical Rim. Horizontal Rim.
the top of the shoe). The neosponge tape is applied to the inside of the shoe. See Figure 3 for shoe orientation. 3.2.2 Use a small pieceof neosponge tape (approx. 5”) to cover the two bolt holes used to mount each shoe clip. 3.3
Preparing the Rim and Shoe Clips (See Figure 3) 3.3.1 Attach thepusher bars (P.M. No. 5) in Figure 3 to the scissor hanger assembly. Notice that the hole in the pusher bar is offcentered. During assembly, ensure that the bottom of the pusher bar extends below the rim clip (P.M. No. 7). 3.3.2 Using one 3/8” x 1” carriage bolt/washer/nut, attach the pusher bar to the front of the rim clip in the notched area. Tighten securely.
the shoes. Each shoe will receive three shoe clips. Tighten securely. 3.3.4 Using a 5” clevis pin, two 3/8” flat washers, and 1/8” hairpin, attach the scissor hanger/pusher bar assembly to the shoe clip. Assembly is accomplished by aligning the upper holes in the scissor hanger channel with the holes in the shoe clip and securing with the clevis pin. 3.3.5 Install thehairpin to prevent the clevis pin from backing out. 3.3.6 Repeat the steps above until all threehanger assemblies are attached to the shoe. 3.3.7 Attach all hanger assemblies to all shoes. PROCEDURAL NOTE…………………………………………………………….. DURING I N-SERVI CE I NSTAL L ATI ONS, EXTRA PRECAUTIONS ARE REQUIRED TO ENSURE THAT NO SEAL COMPONENTS ARE DROPPED INTO THE PRODUCT. 3.3.8 The shoes are now ready for installation. 4.0
SHOE I NSTAL L ATI ON
PROCEDURAL NOTE……………………………………………………………..
4.1.2.2
4.1.2.3
4.1.2.4
Assemble six scissor hanger/pusher bar assemblies as described above for use on the left-hand and right-hand guide shoes. Tighten securely. Do not attach the hanger/pusher bar assemblies to the shoes at this point. Two hanger assemblies without pusher bars are used to hang the guide shoe assembly. These hanger assemblies will be attached later. Install a 3/8” x 2” bolt/nut to mount a shoe hold-down channel to the center hole of both the left and right-hand guide shoe to allow the attachment of a block and tackle.
4.1.3 Guide Shoe Assembly 4.1.3.1
Stand the guide shoe assembly directly in front of the flat bar anti-rotation device so that the channel formed in the guide shoe will fit over the flat-bar attached to the tank.
4.1.3.2
Using #10 x 1” bolts/nuts, attach the right and left-hand guide shoes to the guide shoe assembly. Tighten securely. See Figure 4.
4.1.4 Positioning the Guide Shoe 4.1.4.1
Using a block and tackle, position theguide shoe assembly into the rim space. L ower the guide shoe until the top of the shoe is 4” - 6” above the rim extension. Tie-off the block and tackle to hold the guide shoe in place.
4.1.4.2
To the shoe clips installed earlier, attach three hanger/pusher bar assemblies using five inch clevis pins on both the right-hand and lefthand guide shoe. Assembly is accomplished by aligning the upper holes in the scissor hanger channel with the holes in the shoe clip and securing with the clevis pin.
PROCEDURAL NOTE………………………………………………………….. THE PUSHER BARS WI L L HAVE TO BE SPREAD AND HEL D APART TO AL L OW THE HANGER ASSEM BLY T O ENTER THE RI M SPACE. 4.1.4.3
Using a 5” clevis pin, two 3/8” flat washers, and 1/8” hairpins, attach the scissor hanger/pusher bar assemblies to the shoe clips.
4.1.4.4
Install the hairpin to prevent theclevis pin from backing out.
PROCEDURAL NOTE…………………………………………………………….. USE EXI STI NG BOL T HOLES IN THE RIM EXTENSI ON ONL Y WHEN THEY EXACT L Y M ATCH THE SPACING REQUI RED TO MOUNT THE RIM CLI PS. SAFETY NOTE…………………………………………………………………… WHEN DRIL L I NG ON A TANK IN SERVICE, THE DRIL L BIT MUST BE WATER COOLED. 4.1.5.2
Bolt therim clips to therim extension using 3/8” x 1-1/4” hex tap bolts/washers/nuts. NOTE :
The washer is placed over theslot in the rim clip. Hand tighten only. See Figure 6.
4.1.5.4
Should rim clip adjustment be insufficient to level the shoe, further adjustment can be obtained by re-pinning the scissor mechanism to one of the other adjustment holes in the rim clip.
4.1.5.5
Once properly adjusted, securely tighten all rim clip bolts and nuts.
4.1.5.6
The basic installation of theguide shoe is now complete and theblock and tackle may be removed from the guide shoe.
4.1.6 Following the procedure outlined above, start at the left guide shoe, and working counter-clockwise, begin installing the regular metallic shoes. 4.2
Normal Shoe Installation 4.2.1 Once three scissor hanger/pusher bar assemblies have been attached to each shoe, the shoe is ready for hanging. 4.2.2 Hanging the Shoes 4.2.2.1
To provide a convenient hand-hold on the shoe, securely clamp vise grips, hooks, or other device to the top corners of the shoe. See Figure 7.
Vise Grip
Make Sure Shoe Clips are Fitted
Vise Grip
Shoe
F I GURE 7
4.2.2.7
In the same manner, lower the second shoe into the rim space. Allow the second shoe to overlap the first shoe by two inches.
4.2.2.8
Using vise grips, clamp the two shoes together making sure that the top edges are even and level.
4.2.2.9
The number of shoes that can be installed before bolting the rim clips to the rim is limited only by the number of available vice grips.
PROCEDURAL NOTE…………………………………………………………….. SHOES ARE DESIGNED TO BE L APPED BY T WO INCHES. AN EXT RA SHOE HAS BEEN PROVI DED AS A “MAK E-UP” SHOE FOR THE AREA COVERED BY T HE L AST SHOE I NSTAL L ED. I N THIS AREA, A COMPL ETE SHOE WIL L NOT FI T PROPERL Y . THE “MAK E-UP” SHOE I S FIEL D CUT TO FIT I NTO THIS AREA. 4.2.3 Attaching the Shoes to the Roof 4.2.3.1
Use existing bolt holes in the rim extension where possible. Otherwise, drill or punch a 7/16” hole through the rim extension at each slotted hole in the rim clip. Holes through the
4.2.3.2
Bolt therim clips to therim extension using 3/8” x 1-1/4” hex tap bolts/washers/nuts. NOTE : The washer is placed over the slot in
therimclip. Hand tighten only. See Figure 6. 4.2.3.3
The last shoe installed is field cut-to-length. Carefully measure the space to be filled by the make-up shoe or place the make-up shoe over the space and mark. Before marking the shoe for cutting, be sure to allow the make-up shoe to overlap both adjacent shoes by two inches. Make-up shoes should contain at least two scissor support hangers. Previously installed shoes can be cut to accommodate the make-up shoe.
4.2.3.4
Remove the marked make-up shoe from the rim space. At the mark, scribe a cut-line completely across the shoe and use an air nibbler to perform the cut. File cut edge smooth.
4.2.3.5
Attach the required shoe clips and hanger/pusher bar assemblies and place the trimmed shoe into the rim space and secure.
4.2.3.6
Adj t thesho by raisi
l
ri
the
PROCEDURAL NOTE…………………………………………………………….. I F ADJ USTM ENT CAUSES THE T OP OF THE RIM CL IP TO RISE ABOVE THE RI M EXTE NSION, THE PROTRUDI NG EDGE SHOULD BE TRIMMED AND FI L ED SMOOTH OR COVERED AND PADDED WI TH NEOSPONGE TAPE TO PREVENT DAMAGE T O THE PRI MARY FABRIC. 5.0
INSTAL L ATI ON OF PRIM ARY FABRIC 5.1
Determine Which Fabric Material is Being Used. 5.1.1 Most common fabrics used are: 1. 2. 3.
VS-10 (Petrolam 10) 10 mil, black both sides. VS-18 (Petrolam 18) 18 mil, black both sides. TB-35 (Urethane) 35 mil, black and tan.
5.1.2 The urethane fabric is installed with the tan side up. 5.1.3 Petrolamfabric can be installed with either side up. 5.2
Roll out the Fabric 5.2.1 Near therim space and around the circumference of the roof, sweep clean an area where the primary fabric can be laid out. Be sure the fabric is not laid over any object that may tear or puncture the fabric. Do not walk on top of rolled out fabric.
5.3.1.1
The fabric is not punched and it will be necessary to cut a slot in the fabric so it can be attached to the shoe.
5.3.1.2
Using a razor knife, cut a one inch slit at a position one inch from the top edge of the fabric.
5.3.2 Bolting the Fabric into Place 5.3.2.1
With one hand, pull the top of the shoe away from the tank shell.
5.3.2.2
With the other hand, from the outside toward the inside, insert a 3/8” x 1” carriage bolt (Item12) through the dimpled fabric holddown bolt hole and pierce the neosponge tape.
5.3.2.3
At thehole slit earlier, place thefabric over the bolt.
5.3.2.4
Slide the 7-3/4” shoe hold-down channel (Item 9) over the bolt. L egs of the channel face toward the shoe.
5.3.2.5
Level the fabric with the shoe and tightly secure the fabric and hold-down channel with a 3/8” washer and nut.
SHOE
SHOE OVERLAP FOLD FABRIC
2”
PRIMARY FABRIC SEAL
3/8”x 1 ¼”CARR IAGE BOLT W/ NUT AND WASHER FINGER TIGHTEN ONLY
RIGHT & LEFT SPLICE HOLDDOWN CHANNEL
F I GURE 9
5.3.3.4
Insert a bolt through thefirst bolt hole on the next shoe and extend the fabric over the bolt.
5.3.3.5
Slit the fabric and attach it to the shoeusing theLeft Splice Channel. Again, do not over tighten this bolt. Proper bolting will allow the fabric to expand and contract as the shoes move.
5.3.3.6
Once theRight and Left Splice Channels are secured in place, proceed to the next bolt hole and attach the fabric using the normal 7-3/4” channel.
5.3.3.7
Return to the overlap area. Pull the shoe in toward the floating roof rim and then release. Ensure the splice channels allow the shoes to “expand” and “contract.” Adjust thetightness of the channel bolts as necessary.
5.3.3.8
Continuearound the circumferenceof the tank attaching fabric to the top of the shoes.
PROCEDURAL NOTE…………………………………………………………….. TO REDUCE FIRE HAZARD AND EXPOSURE TO HYDROCARBON MATERI AL S FOR SEAL WORK ON TANKS IN SERVI CE, THE
5.4.3 Splice the fabric using the method appropriatefor thetype of fabric. 5.4.4 Splicing Procedure for TB-35 Fabric (black and tan) 5.4.4.1
Leave approximately threefeet of fabric unattached to the shoe. Position the fabric so the ends of the two rolls overlap approximately ten inches.
5.4.4.2
Clean the ten inch mating surfaces with the supplied cleaner.
5.4.4.3
Apply contact glue to both surfaces and press together firmly.
5.4.4.4
Using a roller, press thefabric flat against the deck and roll out any air trapped in the glued area.
5.4.4.5
Complete the splice by attaching the mechanical splice bars to both sides of the fabric. See Figure 10.
F I GURE 10
NOTE : The glue used to splice the Petrolam fabric
comes in two parts. To ensure a good splice, work quickly. 5.4.5.5
Mix three parts of component B to two parts of component A. Mix thoroughly and quickly apply a thin layer of glue to one of the mating surfaces.
5.4.5.6
Firmly press the two mating surfaces together.
5.4.5.7
Using a roller, press thefabric flat against the deck and roll out any air trapped in the glued area.
5.4.5.8
Complete the splice by attaching the mechanical splice bars to both sides of the fabric. See Figure 10.
5.4.6 Finishing Fabric Attachment to theShoe 5.4.6.1
Install fabric around thecircumference of the tank until a point approximately three feet from the start/finish is reached.
5.4.6.2
At thestart/finish point, it will be necessary to carefully remove approximately three feet of the fabric that was installed first.
5.5
Attaching theFabric to theRim and Installation of Pusher Plates
PROCEDURAL NOTE…………………………………………………………….. USE THE FULL WIDTH OF THE FABRI C SUPPLI ED. AL L OW EXCESS FABRIC T O DRAPE INTO THE RI M SPACE. Determine whether the primary mechanical shoe seal is the only seal to be installed, or if a secondary wiper seal will be added. a. If only a shoeseal is to be installed, a hold-down channel is used to secure the primary fabric to the rim extension. b. When the shoe seal is installed in conjunction with a secondary wiper seal, the secondary seal is installed directly over the primary fabric on horizontal rims (an optional flat bar may be used). Two channels are used on vertical rims. 5.5.1 For a vertical rim, apply neosponge tape to the rim space side of the rim extension. For horizontal rims, the neosponge tape is applied to the top of the rim. 5.5.2 Pusher plates are installed at the same time the primary fabric is being attached to the rim. 5.5.3 Starting at a shoe overlap, position a pusher plate centrally over the lapped area so that the plate pushes the shoe against the tank shell. The top of the pusher plate is mated flush
hold-down channel to the rim extension and tighten securely. Because of the difference in circumference between the shoe and the floating roof rim, the excess fabric must be “gathered” as installation proceeds. 5.5.4.5
When a secondary seal is to be installed, a flat bar is substituted for the rim hold-down channel.
5.5.4.6
Figure 11 shows the positioning detail and Figure 12 shows theattachment detail of the pusher plates.
PART MARK
DESCRIPTION
1
PUSHER PLATE
2
PUSHER BAR
3
PRIMARY FABRIC
5.5.5.2
6.0
Remember to properly position all pusher plates as required.
FI NISHI NG THE SEAL 6.1
The installation of the primary mechanical shoe is now complete. Remove any excess shoe seal parts from theroof. The tank is now ready for service or the installation of the secondary wiper seal.
6.2
If a secondary wiper seal is used in conjunction with the shoe seal, Figure 13 shows the arrangement at the rim.
TOOL LIST 2 2 1 1 2 2 1 1 2 2 12 6 6 2 1 2 2 2 2 1 1
1/2” drive air impacts (Ingersol Rand Model No. 2705A1) 1/2” drive air drills (Ingersol Rand Model No. 728NA3) Air nibbler (Chicago Pneumatic 835) 90o right angle drill (Ingersol Rand Model No. 7LM3A43) 25” tape measures 9/16” combination wrenches 185 CFM air compressor (diesel) 3/4” air hose (number of feet according to tank size) 1/2” air hose (number of feet according to tank size) 1/2” drive ratchet Drill bits 9” channel lock pliers 10R vise grips 11R vise grips 9R vice grips 8R vise grips 12” adjustable wrenches Straight tin snips Utility knives Flat screw drivers Phillips screw drivers 4#hammers 8#hammers 36” bolt cutters
