Flow

Dieterich Standard, Inc.Fisher-Rosemount™

Diamond II Model MSL +46,Steam Service, Horizontal and

Vertical Pipe, Installation Instructions

Annubar TM

STEP 1

Horizontal Line

Always install the MSL steam Annubar in the lower half of the pipe so the condensate will drain into the MSLAnnubar as shown. Both high and low pressure instrument connections must be at the same height in order tomaintain equal condensate heads above the secondary instrumentation. Do not insulate the MSL because youwant condensation to form in the MSL. Never insulate the locking rods.

Less than 50° notrecommended

90-deg up and down belowcenterline best location

High-sideinstrumentconnection

Low-sideinstrumentconnection

2

Flow Locking Rods

Flow

Flo

w

Vertical Pipe Branch

2.50" ( + .030/- .000)Dia. Hole 180° FromOther Hole

STEP 2Depressurize and drain steam line. Drill a 2.50" diameterhole in both sides of pipe exactly 180° apart as shown.Deburr drilled holes on the inside of pipe.

Vertical Line

Always install the steam Annubar horizontally with the instrument connections horizontal as shown. Both thehigh and low pressure instrument connections must be at the same height in order to maintain equal condensateheads above the secondary instrumentation. Insulate up to cross tees or reservoirs. Do not insulate the lockingrods and be sure the cross tees are filled with water.

3

STEP 3

An alignment bar is needed during the welding of the heavy wall weldolets to the steam pipeline. The alignmentbar is supplied by Dieterich Standard. The dimensions are as shown in the picture. The following sections willdiscuss the welding of the MSL parts to the main steam line so be sure to reference the appropriate piping codewelding specifications being used at your facility.

Slide the alignment bar through both holes in pipe and place the opposite-side support weldolet over the endof the alignment bar. Visually center the opposite-side weldolet over the hole. At the other end of the alignmentbar, place shims around the bar to center the top hole. 1/16-in diameter weld rod, bent in an �L� shape, workswell for this operation. Tack weld the weldolet, using 1/2-in. long tacks, spaced closely together. Adjustweldolet as you are making tacks to keep aligned. Complete the welding of the top assembly (steps 4 and 5) before finishing this weld. This will allow for easier adjustments if needed. See figure 2.

Fillet weld to pipe

Weldolet

Figure 2

Carbon Steel

I.D. + Wall + Wall + 30"

2.375" + .005/- .000

4

When this operation is complete, this weld can be X-rayed, off the pipe.

Figure 4

Place alignment bar back into the pipe and opposite-side weldolet, and put shims back into the pipe around thealignment bar to center. Slide the top assembly, weldolet, and packing gland down the alignment bar, and letit rest on the pipe. Ensure holes in the packing gland plate straddle the pipe, or perpendicular to pipe centerlinewithin + 3 deg. This will ensure the MSL impact and static holes will be in line with the flow stream.See figure 4.

Packing gland

Alignment bar

Figure 3

Weld the other heavy wall weldolet to the packing gland assembly with a full penetration-groove weld. Beforewelding, use the alignment bar to ensure the gland is centered on the weldolet. Place the alignment barthrough the packing gland and the weldolet. The weldolet will also have a bearing sleeve in it and it should benear the radius end of the weldolet which will be the end welded to the pipe. The alignment bar can be used for the tack welds, then removed for the first weld pass. Ensure that everything is aligned throughout thewelding process by using the alignment bar between weld passes until the welding is complete. Do notallow the alignment bar to get too hot, as it will be difficult to remove. Use it only briefly to check alignment.See figure 3.

STEP 4

STEP 5

Weldolet

5

Tack weld the assembly using 1/2-inch long tacks, spaced closely together. Adjust the assembly as you aremaking the tacks to keep aligned. Leave the alignment bar in for one weld pass, then remove to finish the welds.Check the alignment as you make additional welds with the MSL Annubar until welding is complete. The filletwelds will be approximately 1-1/8 inch. See figure 5.

Figure 5

Figure 6

Top assembly

Opposite-side weldolet

Do not leave MSL Annubar in too long as it will heat up and make it very difficult to remove. When weldingis complete, the MSL Annubar should slide freely through the packing into the opposite-side weldolet.Complete the weld of the opposite side support in Step 3. The finished weld assembly should look like figure 6.

Note: It is very helpful to have two welders welding the assemblies to pipe, with one welder starting180 deg. from the other. This makes the weldolets stay in place much better.

6

Figure 7

MSL plate

Place the packing into the packing gland with the two split rings (Garlock style 127-AFP) on the outside and thethe three Garlock Carbon/Graphite solid die-formed rings on the inside. Make sure the splits in the outer packing are 180-deg. apart. Slide the Annubar through the packing and install the locking rods, nuts, and lock washers. The dimension between the plates should be 11.9 inches apart. See figure 7.

STEP 6

Lock nuts

Packing-glandplate

Locking rods

7

Figure 8

Figure 9

If you have visual access of the inside of the pipe, the sensing holes should be equally spaced from each sideof the pipe ID. See figure 8.

The 11.9-in. dimension should put you very close, but if there is visual access to the inside of the pipe, makethe small adjustment (if necessary), then lock the MSL in place with the locking rods, nuts, and lock washers.When installed, the MSL will have a dimension of 28 in. from pipe OD to top of head. See figure 9.

Make final measurements from OD to top of head before removing MSL. If not able to observe the inside of pipefor hole locations, a good final check would be to look into opposite support weldolet to insure tip end is in thebearing sleeve. At least one inch of the round section of MSL should be in bearing. If heat treating is necessary,take final measurements of MSL installation and remove MSL. Weld opposite end cap to weldolet using a fullpenetration groove weld. Reinstall MSL after heat treating and ensure flow arrow is pointing in the directionof flow. Ensure that the dimensions taken before heat treating are the same for proper reinstallation.

8

Packing-gland nuts

The last thing to be done is to tighten the packing gland nuts to 25-to-30-ft. lbs. See figure 10.

The pipe should be at a cool temperature for easy removal of the MSL. Before reinstalling, you need toinstall new packing. Order DSI packing per following spare parts list.

figure 10

SPARE PARTS LIST FOR MSL

PART NUMBER DESCRIPTION

19006-04 Ring, solid Carbon/Graph Premium density 2.375 ID-for packing gland19006-12 Ring, split 127-AFP-for packing gland16147-07 Stud, ½-13 UNC-2A x 3.75 long, CS - for packing gland16103-01 Washer, ½� SS- for above stud on packing gland16078-01 Washer, lock - for packing gland plate attachment16068-06 Nut, ½-13 UNC-2B, CS - for stud on packing gland

16068-01 Nut , hex heavy 1�-8 UNC-2B, CS- for locking rod16078-03 Washer, lock 1� CS- for locking rod16132-01 Pin, slotted .187 x 1.375 - for locking rod30343-02 Rod, locking 1�-8 UNC - 2A - for MSL pressure retaining.

9

STEP 7

Locate the transmitter below the MSL so that equal condensate legs will run to the transmitter. Thetransmitter must be far enough away from the MSL so the condensate can cool to a tempaerature that willnot harm the transmitter. It has been observed from various installations that 40 feet below the MSL worksvery well. The MSL is used in severe high temperature and pressure steam applications so be sure theinstrument tubing from the MSL to the transmitter is adequate for your service. In most cases 1/2” sch160 tubing will be needed.

It is also recommended that a valve be welded between the insturment tubing and the instrumentconnections so if any repair needs to be done to anything below the MSL, the valve can isolate the steam and the MSL would not have to be taken off line.

Blowdown

If the main steam line needs to be steam blowdown, remove the MSL and install the transition plugassembly (contact factory).

Dieterich Standard, Inc., Fisher-Rosemount™Box 900303/530-9600

0 Boulder, Colorado 80301 USACopyright 1997, Dieterich Standard, Inc.

All Rights ReservedDS-1253 (6/01)

Rev AA per EC001675