A-6 ~Control Units

Short Description:

A control unit assembly is a system of two or more control rods placed across an expansion joint from flange to flange to minimize possible damage to the expansion joint caused by excessive motion of the pipeline. The control rod assemblies are set at the maximum allowable expansion and/or contraction of the joint and will absorb the static pressure thrust developed at the expansion joint. When used in this manner, they are an additional safety factor, minimizing possible failure of the expansion joint and possible damage to the equipment. Control units will adequately protect the joints, but the user should be sure that the pipe flange strength is sufficient to withstand total force that will be encountered.


Product Detail

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A control unit assembly is a system of two or more control rods placed across an expansion joint from flange to flange to minimize possible damage to the expansion joint caused by excessive motion of the pipeline. The control rod assemblies are set at the maximum allowable expansion and/or contraction of the joint and will absorb the static pressure thrust developed at the expansion joint. When used in this manner, they are an additional safety factor, minimizing possible failure of the expansion joint and possible damage to the equipment. Control units will adequately protect the joints, but the user should be sure that the pipe flange strength is sufficient to withstand total force that will be encountered.

Control units must be used when it is not feasible in a given structure to provide adequate anchors in the proper location. In such cases, the static pressure thrust on the system will cause the expansion joint to extend to the limit set by the control rods which will then preclude the possibility of further motion that would over-elongate the joint. Despite the limiting action that control rods have on the joint, they must be used when proper anchoring cannot be provided. It cannot be emphasized too strongly that rubber expansion joints, by virtue of their function, are not designed to take end thrusts and, in all cases where such are likely to occur, proper anchoring is essential. If this fact is ignored, premature failure of the expansion joint is a forgone conclusion.

1

Outside Nuts

2

Inside Nuts

3

Rubber Washer

4

Metal Washer

5

Control Rod

6

Control Plate

7

Compression Sleeve

8

E.J.Flange

9

Mating Flange

10

Flange Bolt and Nut

Control Units

 

Nominal Pipe Size

Maximum Control Rod Plate O.D.

Maximum Red Diameter

Maximum Control Plate Thickness

maximum Tester Surge Pressure Of the System                     (test pressure is 1.5 times of the working pressure)

       

Number Of Control Rods Recommended

Inches

2

3

4

6

8

1

8.375

1/2

7/16

949

       

11/4

9.75

1/2

7/16

830

       

11/2

9.875

1/2

7/16

510

       

2

11.25

5/8

7/16

661

       

21/2

12.25

5/8

7/16

529

       

3

13.25

5/8

7/16

441

       

31/2

12.625

5/8

7/16

365

547

729

   

4

13.5

5/5

7/16

311

467

622

   

5

14.5

5/5

7/16

235

353

470

   

6

15.5

5/8

7/16

186

278

371

   

8

19.125

3/4

7/16

163

244

326

   

10

21.625

7/8

3/4

163

244

325

488

 

12

24.625

1

3/4

160

240

320

481

 

14

26.625

1

3/4

112

167

223

335

 

16

30.125

1-1/8

3/4

113

170

227

340

453

18

31.625

1-1/8

3/4

94

141

187

181

375

20

34.125

1-1/8

3/4

79

118

158

236

315

22

36.125

1-1/4

1

85

128

171

256

342

24

38.625

1-1/4

1

74

110

147

221

294

26

40.825

1-1/4

1

62

93

124

186

248

28

44.125

1-3/8

1.25

65

98

130

195

261

30

46.375

1-1/2

1.25

70

105

141

211

281

32

49.375

1-1/2

1.25

63

94

125

188

251

34

51.375

1-5/8

1.5

72

107

143

215

286

36

53.625

1-3/4

1.5

69

103

138

207

276

Maximum Pressure For Unanchored Control Units

Test -Design-Surge-Operating

Nominal pipe Size

Style

 

SA,ST,STF,SA,WAF

DA

1-4"

175

130

5-10"

130

130

12-14"

85

85

16-24"

40

40

26-30"

30

30

Recommended rod units in sizes:

1"-8"

2 rods

10"-14"

3 rods

16"-24"

4 rods

Our production process quality control

We treasure process quality control, there is very strict operation specification each process, which can ensure the goods quality:

1.    We use electronic weigher to weigh the weight of ingredients, the precision of weight is gram. So there is no surplus compounds elements;

2.    1.) By controlling material temperature and mixing time in the mixer machine, we can get qualified rubber mixed  composites.

      2) The calender process is the more critical phase, large steel rollers force rubber composites into smooth rubber sheets.

      3)The rubber sheets produced every day must be finished within the same day, we can ensure no rubber sheet remainder each day.

      4) All rubber sheets have passed the test of curometer.

production-process

3.  Adding adhesion agent in the mixture of rubber and nylon tire cord, then the rubber and nylon tire cord can be adhered together and turn into the integral. After vulcanization, all the rubbers are adhered tightly, it is very difficult to delaminate.

Below is the pictures of plastic sheet combined with rubber and nylon tire cord:

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4. In wrapping process: all the elastomer constructions are made by hand-built and machine. After hand-builting, the underneath pressing roller moves along the elastomer body and compact the rubber sheets. There are two main functions of the roller, one is compacting the rubber sheets and making the rubber sheets more bonded, the other one is extruding air between rubber films. So it is very difficult to generate blisters and delamination after vulcanization.

production-process4

5. After vulcanization, there are 4 inspection processes: first qualified products inspection, trimming, assembling process, inspection for finished goods, if the goods with blisters are found then scrap.

Our certificates

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Our workshop

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Our Test instruments

Hot-aging oven

production-process12

Electronic Universal testing machine

production-process13

hydrostatic test

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Rotorless Vulcanizer

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Low Temperature Testing Oven

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Digital  density balance

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FAQ

1.  Does the company accept to show buyer’s logo?

Yes, we can accept buyer’s logo or their trademark.

2.  What is the material of the products?

The flange materials are carbon steel and stainless steel, the materials of rubber elastomer are EPDM/NBR/SBR/NR/Butyl/Neo/Lined with PTFE.

3.  Does the company have approvals or certificate? If yes, what are they?

Yes, we have approvals, such as CE, Wras,ACS, ISO9001 certificate.

4.  What is the average lead time for delivery?

Our average lead time for delivery is between 3-4 weeks, from getting deposit or getting copy of LC.

5.  Does the company have the minimum order quantity requirement? If yes, What is it?

We accept minimum order quantity with 1 full pallet.

6.  What is the acceptable payment method?

We can accept T/T, L/C and D/P. Any other different payment method, we can talk further.

7.  Does the company have their own brand?

Yes, we have our own brand, LD logo.

8.  What is the advantage of the price-quality ratio?

Yes, the price of our goods is more competitive, it is much cheaper, but the quality is much better.

9.  Does the company have product liability insurance?

Yes, we can supply if required.

10. Does the company accept to OEM brand?

Yes, we can accept buyer’s logo or their trademark.

11. Does the company accept to supply samples?

Yes, we can accept samples, by DHL or other courier express.


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