A.W. Chesterton 155 Installation Manual

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MECHANICAL SEAL

INSTALLATION INSTRUCTIONS

15 5™

CARTRIDGE SINGLE SEAL

SEAL INSTALLATION

Preparation

Determine if the pump is in good condition.

A. Check the shaft or sleeve.

1. Remove all burrs and sharp corners, especially in areas where the O-ring has to slide. Cover threads and keyway slots with a thin tape to prevent cutting the O-ring. The distance from the face of the stuffing box to the center of the O-ring groove is .47" (12 mm). For shaft sizes larger than 2.5" (60 mm), this distance is .68" (17 mm).

2. The shaft finish should be no rougher than 32 microinches (0,8 microns) AA. It should feel smooth if you run your fingernail along the shaft in the axial direction.

3. Make sure the shaft or sleeve

diameter is within tolerance (no more than +/- .002" [0,05 mm] from nominal).

Example: 1.750" (50 mm) shaft should not be larger than 1.752" (50,05 mm) or smaller than 1.748" (49,95 mm).

4. Use a dial indicator to measure the shaft runout in the area where the seal is to be installed. Readings

should not exceed .001" TIR per inch (0,001 mm TIR per millimeter) of shaft diameter.

5. Place the dial indicator on the end of the shaft and alternately push and pull the shaft in the axial direction to measure end play. If the bearings are in a good condition, end play should not exceed .005" (0,13 mm) TIR.

6. Protect the sleeve O-ring by lubricating the shaft with a clean silicone based lubricant. A sufficient quantity is provided with the seal.

B. Check the stuffing box face.

1. The stuffing box face must be smooth enough for a gasket to seal; maximum 125 microinches (3,2 microns) AA.

2. Split case pumps will sometimes cause a step (misalignment) to occur on the stuffing box face. This step must be machined flat.

3. Make sure the stuffing box is clean and clear along its entire length.

4. If possible, attach the base of a dial indicator to shaft and rotate shaft and indicator slowly while reading the runout of the stuffing box face. Misalignment of the stuffing box relative to the shaft should not exceed .005" TIR per inch (0,005 mm TIR per millimeter) of shaft diameter.

Installation

1. Check the chemical listing to determine if the FKM O-rings installed in this seal are compatible with the fluid being sealed. If it is necessary to change the O-ring material, disassemble the seal as shown in the instructions and replace it with suitable O-rings. A spare set of Ethylene Propylene O-rings is supplied with the seal.

2. For 155 Small Seal (1" to 2.5" [25 mm to 60 mm] shaft/sleeve): The flat head socket screws (covered with yellow dots) hold the lock ring in place. These socket screws go through the smaller holes on the sleeve. Do not loosen the flat head

socket screws when positioning the seal. The three cup point screws

next to the flat head socket screws press on the sleeve. Their loading configuration assists in centering the sleeve on the shaft. The three cup point screws further away from the flat head socket screws go through the larger holes on the sleeve. Make sure these are engaged through the sleeve but do not protrude into the sleeve I.D. bore.

For 155 Large Seal (larger than

2.5" [60 mm] shaft/sleeve): The

flat head socket screws (covered with yellow dots) hold the lock ring in place. These socket screws go through the smaller holes on the sleeve. Do not loosen the flat head

socket screws when positioning the seal. The three hybrid dog/cup

point screws press on the sleeve. Their loading configuration assists in centering the sleeve on the shaft. The six cup point screws go through the larger holes on the sleeve. Make sure these are engaged through the sleeve but do not protrude into the sleeve I.D. bore.

3. CAUTION: If the 155 seal is

operating at a stuffing box pressure of over 300 psig (20 Bar) or if the shaft is case hardened, replace the three 316 stainless steel set screws that go through the larger holes on the sleeve with the hardened steel set screws supplied with the seal.

SEAL INSTALLATION

4. For 155 Small Seal (1" to 2.5" [25 mm to 60 mm] shaft/sleeve):

Attaching the 478 or any other gland or re-attaching the tabs.

A. When using the 478 or any other

gland instead of the tabs, remove the tabs by removing the tab retaining snap ring and pressing the tabs towards the center of the hub gland and then sliding them out. Slide the 478 or other gland over the hub gland until it bottoms out.

B. If the tabs need to be re-attached:

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up, on a flat surface.

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a tab, apply a small amount of silicone grease to the bottom of the spring. This will help the spring stay in the hole. To install a tab, compress the tab spring by pressing the tab against the hub gland surface and slide the tab till it bottoms out on the hub gland. Place the desired number of tabs, in pairs, at the required orientation. As a minimum two pairs of tabs must be used. When the 155 seal is operating at a stuffing box pressure of over 300 psig (20 Bar), four pairs of tabs must be used.

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gland groove. The snap ring will prevent the tabs from falling off, but can be removed at any time without affecting the performance of the seal. Make sure that the gap between the ends of the snap ring is aligned with the slot in the hub gland for the centering strap.

5. Slide the seal onto the shaft, by pushing on the lock ring.

6. Reassemble the pump and make necessary shaft alignments and impeller adjustments.

7. Orientate the flush connection to the location required. The port is plugged prior to shipping. Removal of the plug will require 25 lbs.-ft. (33,9 Nm) of torque.

8. Piping connections should not be made prior to tightening the gland bolts.

9. Tighten the gland nuts evenly.

IMPORTANT: The gland nuts must be tightened before tightening set screws onto the shaft.

10. The seal has been designed to promote self-centering of the sleeve on the shaft. Following the set screw tightening procedure outlined below will lead to the maximum self-centering possible.

For 155 Small Seal (1" to 2.5" [25 mm to 60 mm] shaft/sleeve):

Tighten the three cup point set screws, that are closer to the flat head screws, evenly. If necessary, tighten the three flat head socket screws with the hex keys provided. Then tighten the three cup point set screws, that are further away from the flat head screws, evenly. After

these three cup point screws have been tightened with the hex key, tighten them again with a torque wrench to 50-60 lbs.-in. (5,7-6, 8 Nm). Pull out the centering strap,

and save the strap. If the strap is lost after seal installation, a standard wire wrap, .054" thick by .187" wide (1,37 mm thick by 4,75 mm) can be used.

For 155 Large Seal (larger than 2.5" [60 mm] shaft/sleeve): Tighten the

three hybrid dog/cup point set screws evenly. If necessary, tighten the three flat head socket screws with the hex keys provided. Then tighten the six cup point set screws evenly. After

these three cup point screws have been tightened with the hex key, tighten them again with a torque wrench to 50-60 lbs.-in. (5,7-6,8 Nm).

Pull out the centering strap, and save the strap. If the strap is lost after seal installation, a standard wire wrap, .068" thick by .300" wide (1,73 mm thick by 7,62 mm) can be used.

11. IMPORTANT: It is important to

make sure that the gland is properly centered over the sleeve. To do this, turn the shaft by hand to make sure the seal turns freely. If you hear metal to metal contact within the seal, it was improperly centered.

For 155 Seal:

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the slot in the hub gland.

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(Do not loosen the flat head socket screws as this will allow the lock ring to come off).

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surrounds the seal sleeve. It will pilot between the hub gland, seal sleeve and lock ring.

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If metal to metal contact still exists check the centering of the stuffing box.

Take all necessary precautions and follow normal safety procedures before starting equipment.

CAUTIONS

These instructions are general in nature. It is assumed that the installer is familiar with seals and certainly with the requirements of their plant for the successful use of mechanical seals. If in doubt, get assistance from someone in the plant who is familiar with seals or delay the installation until a seal representative is available. All necessary auxiliary arrangements for successful operation (heating, cooling, flushing) as well as safety devices must be employed. These decisions are to be made by the user. The chemical listing is intended as a general reference for this seal only. The decision to use this seal or any other Chesterton seal in a particular service is the customer's responsibility.

DISASSEMBLY (1-6) – SMALL (1" to 2.5" [25 mm to 60 mm] shaft/sleeve)

For 155 seal, remove the tabs or the 478 or other gland before disassembling the seal. Remove the tabs by removing the tab retaining snap ring and pressing the tabs towards the center of the hub gland and then sliding them out. To remove the 478 or other gland just pull the gland away from the hub gland.

You will need the hex keys provided with the seal, and an O-ring extractor or paper clip to disassemble the seal.

Place the seal, lock ring side up, on a flat surface. Back out all the screws from the sleeve. Remove the lock ring. Remove the centering strap.

While holding the sleeve and gland together, turn the seal assembly over and lift out the rotary and the sleeve, separating the stationary face from the rotary face with your fingers. Turn the faces in opposite directions if it becomes difficult to separate them.

Remove the back-up washer and stationary drive with the springs. Remove the springs from the stationary drive. Remove the rotary, rotary O-ring and shaft O-ring from the sleeve.

Place the rotary and the sleeve next to the gland assembly.

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dynamic O-ring.

ASSEMBLY (7-14) – SMALL (1" to 2.5" [25 mm to 60 mm] shaft/sleeve)

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silicone grease provided and install it in ÌiÊÃiiÛiÊ°°Ê}ÀÛi°ÊÕLÀV>ÌiÊÌiÊ rotary O-ring and install it in the sleeve O.D. groove.

Slide the rotary onto the sleeve, aligning the drive tabs with the rotary slots. Slide the rotary over the O-ring until the rotary bottoms out. Check to make sure the drive tabs are properly engaged.

Place a spring in each hole in the stationary drive. A small amount of silicone grease can be applied to the bottom of each spring. This will help the springs stay in the holes.

Place the hub gland assembly with the gasket side up, on a flat surface. Align the slots in the stationary drive with the tabs in the hub gland. Slide the stationary drive in until the springs touch the hub gland. Place the back-up washer in the hub gland. It will rest on the stationary drive until the seal is compressed.

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stationary. Slide the O-ring onto the stationary. Slide the stationary into the hub gland until it engages the stationary drive. Be sure to line-up the drive tabs with the stationary slots.

Turn the assembly over and place with the lock ring side of the sleeve up, on a flat surface. Place the lock ring over the sleeve, lining up the flat head socket screws with the smaller holes and the cup point set screws with the larger holes. Press down on the lock ring and tighten the flat head socket screws and the cup point set screws. Check to ensure that the sleeve is not deformed while tightening the set screws. Make sure the screws do not protrude into the sleeve I.D. bore.

Wipe the stationary and rotary faces clean with a lint free cloth. Place the hub gland, with the stationary installed, stationary side up on a flat surface. Place the stuffing box face gasket in the hub gland. Slide the sleeve, with the rotary installed, downwards into the hub gland. Pick up the hub gland and sleeve and continue to push them together until the faces contact each other.

Press down on the hub gland and push the centering strap through the slot in the hub gland. Push the strap in until it completely surrounds the seal sleeve. It will pilot between the hub gland, seal sleeve and lock ring.

DISASSEMBLY (1-8) – LARGE (larger than 2.5" [60 mm] shaft/sleeve)

You will need the hex keys provided with the seal, and an O-ring extractor or paper clip to disassemble the seal.

For 155 large seal, remove the tabs or the 478 or other gland before disassembling the seal. Remove the tabs by removing the tab retaining snap ring and pressing the tabs towards the center of the hub gland and then sliding them out. To remove the 478 or other gland just pull the gland away from the hub gland.

Place the seal, lock ring side up, on a flat surface. Back out all the screws from the sleeve. Remove the lock ring. Remove the centering strap.

While holding the sleeve and gland together, turn the seal assembly over and lift out the rotary and the sleeve, separating the stationary face from the rotary face with your fingers.

Remove the stationary and the adapter together. Separate them and remove the dynamic O-ring.

Place the rotary and the sleeve next to the gland assembly.

Remove the stationary drive with the springs. Remove the static O-ring from inside the hub gland. Remove the springs from the stationary drive.

Remove the rotary, rotary O-ring and shaft O-ring from the sleeve.

ASSEMBLY (9-19) – LARGE (larger than 2.5" [60 mm] shaft/sleeve)

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the silicone grease provided and install

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rotary O-ring and install it in the sleeve O.D. groove.

Slide the rotary onto the sleeve, aligning the drive tabs with the rotary slots. Slide the rotary over the O-ring until the rotary bottoms out. Check to make sure the drive tabs are properly engaged.

Place a spring in each hole in the stationary drive. A small amount of silicone grease can be applied to the bottom of each spring. This will help the springs stay in the holes.

Place the hub gland assembly with the

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the static O-ring and install it in the hub gland. Align the slots in the stationary drive with the tabs in the hub gland. Slide the stationary drive in until the springs touch the hub gland. Place the back-up washer in the hub gland.

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stationary and slide it in the adapter I.D. groove. Place the stationary face down on a flat surface and press the adapter onto the stationary.

Slide the stationary and adapter assembly into the hub gland until it engages the stationary drive. Be sure to line-up the drive tabs with the stationary slots.

ASSEMBLY (9-19

) –

LARGE (larger than 2.5" [60 mm] shaft/sleeve)

Slide the sleeve, with the rotary installed, downwards into the hub gland. Pick up the hub gland and sleeve and continue to push them together until the faces contact each other.

Turn the assembly over and place with the lock ring side of the sleeve up, on a flat surface. Place the lock ring over the sleeve, lining up the flat head socket screws and hybrid dog/cup point set screws with the smaller holes. Also, line up the cup point set screws with the larger holes. Press down on the lock ring and tighten the flat head socket screws, hybrid dog/cup point set screws and the cup point set screws. Check to ensure that the sleeve is not deformed while tightening the set screws. Make sure the screws do not protrude into the sleeve I.D. bore.

Replace the tabs by pressing the tabs toward the center of the hub gland and then sliding them in. Reinstall the tab retaining snap ring. The assembly is now complete.

DIMENSIONAL DATA (DRAWINGS) – SMALL

E MIN

UTS

D A

N M

1/16" Spring Gap (Typical)

L P RC

478 GLAND TABS

CAUTION:

REMOVE BEFORE OPERATING

G MIN

B MAX

CAUTION:

REMOVE BEFORE OPERATING

G MIN

B MAX

DIMENSIONAL DATA (INCH) – SMALL

STUFFING SHAFT BOX BORE SIZE DASH B MAX B MAX C C E A SIZE TABS 478 MIN MAX D MIN F

1.000 8 4.65 4.24 1.75 2.00 1.69 0.63 1.89

1.125 9 4.69 4.24 1.88 2.03 1.82 0.63 1.89

1.250 10 4.90 4.49 2.00 2.26 1.94 0.63 1.89

1.375 11 5.04 4.99 2.13 2.42 2.07 0.63 1.89

1.500 12 5.23 4.99 2.25 2.62 2.19 0.63 1.89

1.625 13 5.29 4.99 2.38 2.68 2.32 0.63 1.89

1.750 14 5.41 5.49 2.50 2.80 2.44 0.63 1.89

1.875 15 5.53 5.49 2.63 2.93 2.57 0.63 1.89

2.000 16 5.74 5.99 2.75 3.18 2.69 0.63 1.89

2.125 17 6.04 5.99 2.88 3.43 2.82 0.63 1.89

2.250 18 6.14 6.24 3.00 3.55 2.94 0.63 1.89

2.375 19 6.29 6.24 3.13 3.59 3.07 0.63 1.89

2.500 20 6.41 6.49 3.25 3.80 3.19 0.63 1.89

G MIN G MIN TABS 478 3/8" 1/2" 5/8" 3/8" 1/2" 5/8" BOLTS BOLTS BOLTS BOLTS BOLTS BOLTS

2.88 3.01 3.13 2.90 – –

2.92 3.05 3.17 2.90 – –

3.13 3.26 3.38 3.21 – –

3.27 3.40 3.52 3.52 – –

3.46 3.59 3.71 3.52 – –

3.52 3.65 3.77 3.51 3.63 –

3.64 3.77 3.89 3.74 3.86 –

3.76 3.89 4.01 3.90 4.02 –

3.97 4.10 4.22 4.15 4.27 –

4.27 4.40 4.52 4.53 4.66 4.78

4.38 4.51 4.63 4.56 4.69 4.81

4.52 4.65 4.77 4.56 4.69 4.81

4.65 4.78 4.90 4.79 4.92 5.04

DIMENSIONAL DATA (METRIC) – SMALL

STUFFING SHAFT BOX BORE SIZE B MAX B MAX C C E A TABS 478 MIN MAX D MIN F

25 118 108 44 51 43 16 48 28 118 108 47 52 46 16 48 30 124 111 49 57 48 16 48 32 124 114 51 58 50 16 48 33 124 114 52 59 51 16 48 35 128 127 54 62 52 16 48 38 133 127 57 67 56 16 48 40 134 127 59 68 58 16 48 43 134 127 62 69 61 16 48 45 140 139 64 73 63 16 48 48 139 139 67 74 66 16 48 50 145 139 69 78 68 16 48 55 150 158 74 83 73 16 48 60 160 158 79 91 78 16 48

G MIN G MIN TABS 478 8 mm 10 mm 12 mm 8 mm 10 mm 12 mm BOLTS BOLTS BOLTS BOLTS BOLTS BOLTS

70 72 74 71 73 – 70 72 74 71 73 – 76 78 80 77 79 – 77 79 81 78 80 – 76 78 80 78 80 – 80 82 84 86 88 – 85 87 89 86 88 – 86 88 90 86 88 90 86 88 90 86 88 90 92 94 96 92 94 96 91 93 95 92 94 96 97 99 101 96 98 100 102 104 106 112 114 116 112 114 116 113 115 117

NPT 478 SIZE H J K L M N P R S T U GLAND V

0.44 0.93 0.37 1.76 1.58 0.47 2.25 2.45 120 124 126 9 1/8"

0.44 0.93 0.37 1.89 1.58 0.47 2.25 2.48 122 126 128 9 1/8"

0.44 0.93 0.37 2.01 1.58 0.47 2.43 2.70 124 128 130 11 1/8"

0.44 0.93 0.37 2.14 1.58 0.47 2.75 2.84 126 130 132 12 1/8"

0.44 0.93 0.37 2.26 1.58 0.47 2.75 3.03 128 132 134 12 1/8"

0.58 0.93 0.37 2.39 1.58 0.47 2.87 3.08 130 134 136 13 1/8"

0.58 0.93 0.37 2.51 1.58 0.47 3.12 3.21 132 136 138 14 1/8"

0.58 0.93 0.37 2.64 1.58 0.47 3.25 3.33 134 138 140 15 1/8"

0.58 0.93 0.37 2.76 1.58 0.47 3.50 3.54 136 140 142 16 1/8"

0.69 0.93 0.37 2.89 1.58 0.47 3.75 3.84 138 142 144 18 1/8"

0.69 0.93 0.37 3.01 1.58 0.47 3.87 3.94 140 144 146 19 1/8"

0.69 0.93 0.37 3.14 1.58 0.47 3.90 4.08 142 146 148 19 1/8"

0.69 0.93 0.37 3.26 1.58 0.47 4.12 4.21 144 148 150 20 1/8"

NPT 478 SIZE H J K L M N P R S T U GLAND V

11 24 9 44 40 12 57 62 120 124 126 9 1/8" 11 24 9 47 40 12 57 62 121 126 128 9 1/8" 11 24 9 49 40 12 60 68 123 127 129 10 1/8" 11 24 9 51 40 12 62 69 124 128 130 11 1/8" 11 24 9 52 40 12 62 69 125 129 131 11 1/8" 11 24 9 54 40 12 70 72 126 130 132 12 1/8" 11 24 9 57 40 12 70 77 128 132 134 12 1/8" 15 24 9 59 40 12 73 78 129 134 135 13 1/8” 15 24 9 62 40 12 73 78 131 135 137 13 1/8" 15 24 9 64 40 12 79 84 132 136 138 14 1/8" 15 24 9 67 40 12 79 84 134 139 140 14 1/8" 15 24 9 69 40 12 82 89 136 140 142 15 1/8" 17 24 9 74 40 12 94 94 139 143 145 18 1/8" 17 24 9 80 40 12 99 104 142 146 148 19 1/8"

KEY (drawings & charts)

A – Shaft Size B – Maximum Gland Tab Diameter C – Stuffing Box Inside Diameter D – Seal Diameter in Stuffing Box E – Minimum Stuffing Box Depth

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G – Minimum Bolt Circle by Bolt Size H – Slot Width J – Hub Gland Flange Width K – Hub Gland Sot Width

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M – Distance from Stuffing Box Face to Set Screws N – Distance from Stuffing Box Face to Shaft O-Ring P – Hub Gland Slot Diameter R – Hub Gland Diameter S – Shaft O-Ring T – Rotary O-Ring U – Stationary O-Ring V – NPT Size

DIMENSIONAL DATA (DRAWINGS) – LARGE & OVERSIZE

LARGE

MIN

D A

N M

3/32" Spring Gap (Typical)

U VTS

TABS

CAUTION:

REMOVE BEFORE OPERATING

L RC

B MAX

G MIN

OVERSIZE – SMALL

(1.13" to 2.50" shaft/sleeve)

MIN

D A

N M

UTS

OVERSIZE – LARGE

(2.63" to 4.75" shaft/sleeve)

E MIN

L RC

D A

N M

U VTS

L RC

1/16" Spring Gap

(Typical)

3/32" Spring Gap (Typical)

DIMENSIONAL DATA (INCH) – LARGE

STUFFING SHAFT BOX BORE G MIN SIZE DASH B C C E 1/2" 5/8" 3/4" A SIZE MAX MIN MAX D MIN F BOLTS BOLTS BOLTS

2.625 21 7.63 3.63 4.00 3.54 0.88 2.50 5.35 5.48 5.60

2.750 22 7.76 3.75 4.13 3.67 0.88 2.50 5.48 5.60 5.73

2.875 23 7.88 3.88 4.25 3.79 0.88 2.50 5.60 5.73 5.85

3.000 24 8.01 4.00 4.44 3.92 0.88 2.50 5.73 5.85 5.98

3.125 25 8.13 4.13 4.55 4.04 0.88 2.50 5.85 5.98 6.10

3.250 26 8.26 4.25 4.69 4.17 0.88 2.50 5.98 6.10 6.23

3.375 27 8.38 4.38 4.80 4.29 0.88 2.50 6.10 6.23 6.35

3.500 28 8.51 4.50 4.94 4.42 0.88 2.50 6.23 6.35 6.48

3.625 29 8.63 4.63 5.05 4.54 0.88 2.50 6.35 6.48 6.60

3.750 30 8.76 4.75 5.14 4.67 0.88 2.50 6.48 6.60 6.73

3.875 31 8.88 4.88 5.26 4.79 0.88 2.50 6.60 6.73 6.85

4.000 32 9.01 5.00 5.44 4.92 0.88 2.50 6.73 6.85 6.98

4.125 33 9.13 5.13 5.55 5.04 0.88 2.50 6.85 6.98 7.10

4.250 34 9.18 5.25 5.69 5.17 0.88 2.50 6.89 7.02 7.14

4.375 35 9.30 5.38 5.81 5.29 0.88 2.50 7.02 7.14 7.27

4.500 36 9.43 5.50 5.94 5.42 0.88 2.50 7.14 7.27 7.39

4.625 37 9.56 5.63 6.06 5.54 0.88 2.50 7.27 7.39 7.52

4.750 38 9.76 5.75 6.22 5.67 0.88 2.50 7.47 7.60 7.72

DIMENSIONAL DATA (METRIC) – LARGE

STUFFING SHAFT BOX BORE G MIN SIZE B C C E 10 mm 12 mm 16 mm A MAX MIN MAX D MIN F BOLTS BOLTS BOLTS

65 194 92 102 90 22 64 132 134 138 70 197 95 105 93 22 64 135 137 141 75 203 100 113 99 22 64 141 143 147 80 207 105 116 103 22 64 144 146 150 85 213 110 122 109 22 64 151 153 157 90 216 115 125 113 22 64 154 156 160 95 222 120 131 118 22 64 160 162 166 100 229 127 138 125 22 64 167 169 173 110 236 136 148 134 22 64 174 176 180 120 248 145 158 144 22 64 186 188 192

O-RINGS NPT SIZE J K L M N R S T U V W

1.08 1.33 3.49 2.22 0.68 4.79 231 234 236 239 1/4"

1.08 1.33 3.61 2.22 0.68 4.92 232 235 237 240 1/4"

1.08 1.33 3.74 2.22 0.68 5.04 233 236 238 241 1/4"

1.08 1.33 3.86 2.22 0.68 5.17 234 237 239 242 1/4"

1.08 1.33 3.99 2.22 0.68 5.29 235 238 240 243 1/4"

1.08 1.33 4.11 2.22 0.68 5.42 236 239 241 244 1/4'

1.08 1.33 4.24 2.22 0.68 5.54 237 240 242 245 1/4"

1.08 1.33 4.36 2.22 0.68 5.67 238 241 243 246 1/4"

1.08 1.33 4.49 2.22 0.68 5.79 239 242 244 247 1/4"

1.08 1.33 4.61 2.22 0.68 5.92 240 243 245 248 1/4"

1.08 1.33 4.74 2.22 0.68 6.04 241 244 246 249 1/4"

1.08 1.33 4.86 2.22 0.68 6.17 242 245 247 250 1/4"

1.08 1.33 4.99 2.22 0.68 6.29 243 246 248 251 1/4"

1.08 1.33 5.11 2.22 0.68 6.33 244 247 249 252 1/4"

1.08 1.33 5.24 2.22 0.68 6.46 245 248 250 253 1/4"

1.08 1.33 5.36 2.22 0.68 6.58 246 249 251 254 1/4”

1.08 1.33 5.49 2.22 0.68 6.71 247 250 252 255 1/4"

1.08 1.33 5.61 2.22 0.68 6.91 248 251 253 256 1/4"

O-RINGS NPT SIZE J K L M N R S T U V W

34 89 56 17 122 231 234 236 239 1/4"

27 27 34 92 56 17 125 232 235 237 240 1/4" 27 34 98 56 17 131 234 237 239 242 1/4" 27 34 102 56 17 134 236 238 240 243 1/4" 27 34 108 56 17 141 237 240 242 245 1/4" 27 34 112 56 17 144 239 241 243 246 1/4" 27 34 117 56 17 150 240 243 245 248 1/4" 27 34 123 56 17 157 242 245 247 250 1/4" 27 34 133 56 17 164 245 248 250 253 1/4" 27 34 142 56 17 176 248 251 253 256 1/4"

DIMENSIONAL DATA (INCH) – OVERSIZE

STUFFING SHAFT BOX BORE G MIN SIZE DASH B C C E 3/8" 1/2" 5/8" 3/4" 7/8" A SIZE MAX MIN MAX D MIN F BOLTS BOLTS BOLTS BOLTS BOLTS

1.125 9 5.29 2.50 2.75 1.82 0.63 1.89 3.59 3.72 3.84 – –

1.375 11 5.57 2.68 3.00 2.07 0.63 1.89 3.86 3.99 4.11 – –

1.750 14 6.64 3.37 3.75 2.44 0.63 1.89 4.93 5.06 5.18 – –

1.875 15 6.58 3.42 3.81 2.57 0.63 1.89 4.88 5.01 5.13 – –

2.125 17 7.31 3.75 4.25 2.82 0.63 1.89 5.60 5.73 5.85 – –

2.500 20 8.14 4.37 4.75 3.19 0.63 1.89 6.43 6.56 6.68 – –

2.625 21 8.04 4.38 4.78 3.54 0.88 2.50 – 5.83 5.96 6.08 6.21

2.750 22 8.04 4.28 4.78 3.67 0.88 2.50 – 5.83 5.96 6.08 6.21

3.000 24 8.65 4.75 5.39 3.92 0.88 2.50 – 6.44 6.57 6.69 6.82

3.375 27 8.54 4.78 5.27 4.29 0.88 2.50 – 6.33 6.46 6.58 6.71

3.750 30 9.63 5.78 6.40 4.67 0.88 2.50 – 7.41 7.54 7.66 7.79

4.125 33 9.54 5.78 6.27 5.04 0.88 2.50 – 7.33 7.46 7.58 7.71

4.750 38 11.25 7.03 7.65 5.67 0.88 2.50 – 9.04 9.17 9.29 9.42

KEY (drawings & charts)

A – Shaft Size B – Maximum Gland Tab Diameter C – Stuffing Box Inside Diameter D – Seal Diameter in Stuffing Box E – Minimum Stuffing Box Depth

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G – Minimum Bolt Circle by Bolt Size J – Hub Gland Flange Width K – Distance from Stuffing Box Face to Back of Tab

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M – Distance from Stuffing Box Face to Set Screws N – Distance from Stuffing Box Face to Shaft O-Ring R – Hub Gland Diameter S – Shaft O-Ring T – Rotary O-Ring U – Stationary O-Ring V – Gland O-Ring (applies only to large size and large oversize seal) W – NPT Size

O-RINGS NPT SIZE J K L M N R S T U V W

0.93 1.18 1.89 1.58 0.47 3.15 122 126 128 – 1/4"

0.93 1.18 2.14 1.58 0.47 3.43 126 130 132 – 1/4"

0.93 1.18 2.51 1.58 0.47 4.49 132 136 138 – 1/4"

0.93 1.18 2.64 1.58 0.47 4.44 134 138 140 – 1/4"

0.93 1.18 2.89 1.58 0.47 5.17 138 142 144 – 1/4"

0.93 1.18 3.26 1.58 0.47 6.00 144 148 150 – 1/4”

1.08 1.33 3.49 2.22 0.68 5.27 231 234 236 239 1/4"

1.08 1.33 3.61 2.22 0.68 5.27 232 235 237 240 1/4"

1.08 1.33 3.86 2.22 0.68 5.88 234 237 239 242 1/4"

1.08 1.33 4.24 2.22 0.68 5.77 237 240 242 245 1/4"

1.08 1.33 4.61 2.22 0.68 6.86 240 243 245 248 1/4"

1.08 1.33 4.99 2.22 0.68 6.77 243 246 248 251 1/4"

1.08 1.33 5.61 2.22 0.68 8.48 248 251 253 256 1/4"

PARTS IDENTIFICATION

(1" to 2.5" [25 mm to 60 mm] shaft/sleeve)

1 2 3 4 4 5

6 7

8 4

9 10 11 12 13

14 15 16 17 18

1 2 3 4 4 5

6 7 4 8 4

(larger than 2.5" [60 mm] shaft/sleeve)

SMALL

LARGE

9 10 11 12 13

14 15 16 17 18

KEY

1 – Bolt Tab 2 – Pipe Plug 3 – Rotary Seal Ring 4 – O-Ring 5 – Sleeve 6 – Gasket 7 – Hub Gland Assembly 8 – Stationary Seal Ring 9 – Back-up Washer

155 is a trademark of A.W. Chesterton Company.

860 Salem Street Groveland, MA 01834 USA Telephone: 781-438 -7000 Fax: 978-469- 6528 www.chesterton.com

10 – Stationary Drive 11 – Centering Strap 12 – Cup Point Set Screw

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14 – Dot 15 – Flat HD Socket Screw 16 – Snap Ring 17 – Spring 18 – Bolt Tab Spring

KEY

1 – Bolt Tab 2 – Pipe Plug 3 – Rotary Seal Ring 4 – O-Ring 5 – Sleeve 6 – Stationary Seal Ring 7 – Gasket 8 – Hub Gland Assembly 9 – Adapter

Chesterton ISO certificates available on www.chesterton.com/corporate/iso

FORM NO. 071379 REV. 5 PRINTED IN USA 04/14

10 – Stationary Drive 11 – Centering Strap 12 – Flat HD Socket Screw 13 – Dot

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15 – Cup Point Set Screw 1/4 Dog Point Set Screw (not shown) 16 – Spring 17 – Snap Ring 18 – Bolt Tab Spring

A.W. Chesterton 155 Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual