A fluid end, includes a plunger reciprocating within a first bore, the plunger increasing a pressure of a fluid within a pressure chamber. The fluid end also includes a second bore. The fluid end further includes a plug assembly associated with the second bore. The plug assembly includes a plug body positioned within the second bore. The plug assembly also includes a lock ring positioned, at least in part, within the second bore, the lock ring positioned to be driven radially outward responsive to a longitudinal force applied to the plug body.

A fluid end, includes a plunger reciprocating within a first bore, the plunger increasing a pressure of a fluid within a pressure chamber. The fluid end also includes a second bore. The fluid end further includes a plug assembly associated with the second bore. The plug assembly includes a plug body positioned within the second bore. The plug assembly also includes a lock ring positioned, at least in part, within the second bore, the lock ring positioned to be driven radially outward responsive to a longitudinal force applied to the plug body.

A temporary trap door cap device for sealing around a pressure-leaking trap door at an end of a pipeline terminating in a trap includes a canister formed from a longitudinally extending pipe having an open end and a closed end; and an annular rim connected to the open end, with an inner diameter smaller than an inner diameter of the canister. The annular rim is configured such that the inner diameter of the annular rim fits over the trap door of the trap terminating the pipeline. After the annular rim has passed over the trap door, the inner diameter of the annular rim is compressible against a body of the trap terminating the pipeline so as to seal an inner volume of the canister pressure-tight thereby containing the trap door within the pressure-tight volume.

A temporary trap door cap device for sealing around a pressure-leaking trap door at an end of a pipeline terminating in a trap includes a canister formed from a longitudinally extending pipe having an open end and a closed end; and an annular rim connected to the open end, with an inner diameter smaller than an inner diameter of the canister. The annular rim is configured such that the inner diameter of the annular rim fits over the trap door of the trap terminating the pipeline. After the annular rim has passed over the trap door, the inner diameter of the annular rim is compressible against a body of the trap terminating the pipeline so as to seal an inner volume of the canister pressure-tight thereby containing the trap door within the pressure-tight volume.

A composite vessel and fitting for a through-wall penetration having an exposed end grain. The fitting includes a sealing surface arrangement that seals against the composite vessel and prevents leakage of the vessel contents while protecting the end grain from exposure to internal fluid and/or external environment. The fitting includes an outer part, an inner part, and a through-wall part extending between the inner and outer parts across the penetration. An outer seal arrangement includes an outer seal having a first sealing surface that seals against the outer surface of the composite vessel to restrict environmental contaminants migrating to the end grain. An inner seal arrangement includes at least one inner seal having second and third sealing surfaces. The second sealing surface seals against the inner surface of the composite vessel and the third sealing surface seals a leak path or interface between the inner part and through-wall part to restrict internal fluid migrating to the end grain.

A composite vessel and fitting for a through-wall penetration having an exposed end grain. The fitting includes a sealing surface arrangement that seals against the composite vessel and prevents leakage of the vessel contents while protecting the end grain from exposure to internal fluid and/or external environment. The fitting includes an outer part, an inner part, and a through-wall part extending between the inner and outer parts across the penetration. An outer seal arrangement includes an outer seal having a first sealing surface that seals against the outer surface of the composite vessel to restrict environmental contaminants migrating to the end grain. An inner seal arrangement includes at least one inner seal having second and third sealing surfaces. The second sealing surface seals against the inner surface of the composite vessel and the third sealing surface seals a leak path or interface between the inner part and through-wall part to restrict internal fluid migrating to the end grain.

A fluid end, includes a plunger reciprocating within a first bore, the plunger increasing a pressure of a fluid within a pressure chamber. The fluid end also includes a second bore. The fluid end further includes a plug assembly associated with the second bore. The plug assembly includes a plug body positioned within the second bore. The plug assembly also includes a lock ring positioned, at least in part, within the second bore, the lock ring positioned to be driven radially outward responsive to a longitudinal force applied to the plug body.

A fluid end, includes a plunger reciprocating within a first bore, the plunger increasing a pressure of a fluid within a pressure chamber. The fluid end also includes a second bore. The fluid end further includes a plug assembly associated with the second bore. The plug assembly includes a plug body positioned within the second bore. The plug assembly also includes a lock ring positioned, at least in part, within the second bore, the lock ring positioned to be driven radially outward responsive to a longitudinal force applied to the plug body.

A composite vessel and fitting for a through-wall penetration having an exposed end grain. The fitting includes a sealing surface arrangement that seals against the composite vessel and prevents leakage of the vessel contents while protecting the end grain from exposure to internal fluid and/or external environment. The fitting includes an outer part, an inner part, and a through-wall part extending between the inner and outer parts across the penetration. An outer seal arrangement includes an outer seal having a first sealing surface that seals against the outer surface of the composite vessel to restrict environmental contaminants migrating to the end grain. An inner seal arrangement includes at least one inner seal having second and third sealing surfaces. The second sealing surface seals against the inner surface of the composite vessel and the third sealing surface seals a leak path or interface between the inner part and through-wall part to restrict internal fluid migrating to the end grain.

A composite vessel and fitting for a through-wall penetration having an exposed end grain. The fitting includes a sealing surface arrangement that seals against the composite vessel and prevents leakage of the vessel contents while protecting the end grain from exposure to internal fluid and/or external environment. The fitting includes an outer part, an inner part, and a through-wall part extending between the inner and outer parts across the penetration. An outer seal arrangement includes an outer seal having a first sealing surface that seals against the outer surface of the composite vessel to restrict environmental contaminants migrating to the end grain. An inner seal arrangement includes at least one inner seal having second and third sealing surfaces. The second sealing surface seals against the inner surface of the composite vessel and the third sealing surface seals a leak path or interface between the inner part and through-wall part to restrict internal fluid migrating to the end grain.