Lined pipe joint and seal

A pipe section comprising:

• an outer portion having an end;
• a liner having a first outer surface spaced radially inwardly from said outer portion and an end spaced longitudinally inwardly from the end of said outer portion;
• grout disposed between said outer portion and said liner for holding said liner in said outer portion;
• and
• a lining end at an end of said liner and having a second outer surface of larger diameter than said first outer surface, said second outer surface comprising a shoulder abutting said grout such that longitudinal contraction of said liner relative to said pipe section is prevented, said shoulder being spaced longitudinally inwardly from said end of the outer portion said lining end extending between the end of said liner and the end of said outer portion.

A pipe section comprising:

• an outer portion;
• a liner having an outer surface spaced radially inwardly from said outer portion;
• grout disposed between said outer portion and said liner for holding said liner in said outer portion;
• and
• a lining end at an end of said liner and comprising a shoulder abutting said grout such that such longitudinal contraction of said liner relative to said pipe section is prevented, and wherein:
• there is radially inward deflection of the pipe section when the pipe section is engaged with a pipe fitting;
• and
• said lining end defines an outwardly tapered bore therein, said tapered bore being sized such that a minimum inside diameter thereof is at least as large as an inside diameter of said liner after said deflection.

A pipe section comprising:

• an outer portion;
• a liner having an outer surface spaced radially inwardly from said outer portion;
• grout disposed between said outer portion and said liner for holding said liner in said outer portion;
• and
• a lining end at an end of said liner and comprising a shoulder abutting said grout such that longitudinal contraction of said liner relative to said pipe section is prevented, and wherein said lining end defines a chamfer at a longitudinal end thereof.

A pipe section comprising:

• an outer portion having an end;
• a liner having an outer surface spaced radially inwardly from said outer portion and an end spaced longitudinally inwardly from the end of said outer portion;
• grout disposed between said outer portion and said liner for holding said liner in said outer portion;
• and
• a lining end at an end of said liner and comprising a shoulder abutting said grout such that longitudinal contraction of said liner relative to said pipe section is prevented, said lining end being a separate component from said liner and extending between the end of said liner and the end of said outer portion and further comprising:
• a sleeve portion disposed around an end of said liner, an end of said sleeve portion forming said shoulder;
• and
• an end portion extending from said sleeve portion and abutting an end of said liner.

A pipe joint comprising:

• a pipe section comprising:
• a metal outer portion;
• a liner disposed in said outer portion;
• grouting material between said liner and outer portion for holding said liner in place within said outer portion;
• and
• a lining end extending from said liner and comprising a shoulder abutting said grout such that longitudinal contraction of said liner within said outer portion is prevented;
• a collar seal extending into an end of said pipe section;
• a pipe fitting engaged with said pipe section such that an annulus is defined between said collar seal and said fitting;
• and
• sealing check valve means for sealing between said collar seal and said pipe section when pressure within said pipe section is greater than pressure in said annulus and allowing relief of pressure in said annulus when said pressure in said annulus is greater than the pressure within said pipe section.

A method of assembling a pipe joint comprising the steps of:

• threading a first pipe section into a pipe coupling such that the pipe coupling extends from the pipe section;
• positioning a collar seal in said pipe section such that an annulus is formed between said collar seal and said pipe coupling, said collar seal providing sealing engagement between said pipe section and shouldering against an end thereof;
• filling said annulus with liquid;
• threading a second pipe section into said coupling such that said second pipe section extends over an end of said collar seal;
• and
• providing check valve means for allowing liquid to escape from said annulus as said second pipe section is threaded into said coupling.