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Test Pressures and Applied Loads
For Clamps Designed to Fit
API Spec 16A Specified Hubs

API Spec 16A clamps differ from all other API equipment in regard to design and hydrotest. Clamps serve as fasteners similar to bolts, they do not come in contact with well fluid, and they may connect several API specified connectors having different nominal sizes and working pressures.

API Spec 16A permits clamps to have marking as to clamp number, e.g. No. 6, or a specific connection, e.g. 3-1/16” 15M.

API Spec 16A, 3rd Edition, states that: “Each clamp shall be designed for the highest loading that may be induced by any hub it is intended to fit.” WOODCO USA interprets this to mean any API 16A specified hub a clamp will fit. We also understand this to mean that any and all clamps shall experience a test to this highest loading regardless of the manufacturers or users choice in marking.

The table below identifies the API Spec 16A clamps by number designation and identifies the hub(s) each numbered clamp will fit. The table further provides the maximum load applied to the clamp at test pressure related to each specified hub, with the hub which applies the greatest load to the clamp at test pressure highlighted and indicated in bold type.

CLAMP NO.

HUB

NOMINAL BORE

HUB

WORKING PRESSURE (WP)
PSI

HUB

RING GASKET

MAXIMUM LOAD (LBS.) APPLIED TO CLAMP AT TEST PRESSURE
(1.5 X WP)

RX

BX

  1 *

1 13/16

10,000

 

151

131,086

 

2 1/16

5,000

 

152

86,999

  2 *

1 13/16

15,000

 

151

190,086

 

2 1/16

10,000

 

152

159,195

 

2 9/16

5,000

 

153

120,230

  3 *

1 13/16

20,000

 

151

249,084

 

2 1/16

15,000

 

152

231,390

 

2 1/16

20,000

 

152

303,586

 

2 9/16

15,000

 

153

324,090

  4 *

2 9/16

10,000

 

153

222,160

 

3 1/8

5,000

 

154

157,577

  5 *

3 1/16

10,000

 

154

293,446

 

4 1/16

5,000

 

155

244,770

  6 *

2 9/16

20,000

 

153

426,020

 

3 1/16

15,000

 

154

429,315

 

4 1/16

10,000

 

155

460,951

 7

5-1/8

10,000

 

169

621,164

 8

3 1/16

20,000

 

154

565,183

 

4 1/16

15,000

 

155

677,133

 

5-1/8

15,000

 

169

917,346

 

7 1/16

5,000

 

156

600,140

 

9

5,000

 

157

901,744

   9 *

11

3,000

53

-

690,839

   10 *

4 1/16

20,000

 

155

893,314

 

7 1/16

10,000

 

156

1,151,311

 

9

10,000

 

157

1,714,299

 

11

5,000

 

158

1,270,351

   11 *

13 5/8

3,000

57

-

924,974

   12 *

16 3/4

2,000

65

-

919,579

    13 * 

13 5/8

5,000

 

160

1,599,602

   14 *

16 3/4

3,000

65

-

1,360,313

   15 *

7 1/16

20,000

 

156

2,253,657

 

11

15,000

 

158

3,659,760

 

13 5/8

10,000

 

159

3,588,470

   16 *

21 1/4

2,000

73

  1,409,609

   17 *

20 3/4

3,000

73

 

2,087,840

    18 * 

21 1/4

2,000

73

 

1,409,609

   19 *

16 3/4

5,000

 

162

2,145,269

20

30**

1,000

SPCL

 

1,327,524

22

7 1/16

15,000

 

156

1,702,490

 

11

10,000

 

158

2,465,061

25

7 1/16

2,000

45

 

235,318

26

18 3/4

15,000

 

164

9,406,187
 

21 1/4

10,000

 

166

7,893,053

27

18 3/4

10,000

 

164

6,300,799
 

21 1/4

5,000

 

165

3,800,556

28

11

20,000

 

158

4,854,467
 

13 5/8

15,000

 

159

5,336,027
 

16 3/4

10,000

 

162

4,261,948

*   Clamps marked with an asterisk also fit existing hubs not specified in API Spec 16A. In some cases the currently required test pressures may not verify the clamp safety when installed on hubs other than those identified in API Spec 16A.

**  We have also included a WOODCO USA proprietary  30" 1000 special hub and No. 20 clamp for diverters.

 

Caution: For Older Cast Steel Clamps For Clamp Hub Connections Click Here.

For an example Q & A on this subject Click Here.

At WOODCO USA the same knowledge and effort we put into this web site goes into every product we sell. If this Web Site helps you, or persons for whom you have responsibility, please reward WOODCO USA with your business.


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